What are the cheapest airlines flying from Ottawa to London round-trip?

Our cheapest airline available from Ottawa to London is United Airlines. Our recent data shows that you can find tickets from as low as C$ 955 on this airline. Additional options worth looking into are Porter Airlines and Air Transat, starting at C$ 970 and C$ 1,002 round-trip. You may be able to fly from Ottawa to London for 7% less than the average price by searching for these airlines.

What are the cheapest airlines to fly from Ottawa to London one-way?

To fly one-way, consider booking your trip with Air Canada, which is currently one of the cheapest options available, starting at C$ 469. Porter Airlines flights start at C$ 476 while deals on WestJet start at C$ 477 one-way.

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 mm per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What are the most popular routes from Ottawa to London?

Most travellers choose Ottawa - London Heathrow, Ottawa - London Gatwick or Ottawa - London City when deciding on the best route from Ottawa to London.

What are the cheapest flights from Ottawa to London?

The cheapest flight price from Ottawa to London is C$ 966. On average you can expect to pay C$ 1,972. The most popular route, (Ottawa - London Heathrow), can usually be booked for C$ 895.

What are the most reliable airlines from Ottawa to London?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Ottawa to London on time: Air Canada (77%), Aegean Airlines (77%), Austrian Airlines (77%).

What are the most popular airlines that fly from Ottawa to London?

Before booking your flight from Ottawa to London check out the most popular airlines for this route: Air Canada, Air France or KLM.

What is the cheapest day to fly round-trip from Ottawa to London?

Saturday flights are found to be more expensive to fly from Ottawa to London. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London.

How far in advance should I book a flight from Ottawa to London?

To save up to 12% on this flight, we recommend booking at least 55 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ottawa to London from C$ 936 1-2 weeks out and tickets from C$ 936 for flights departing within the next 72 hours.

What is the cheapest month to fly from Ottawa to London?

February can be a great time to fly to London from Ottawa with a flight ticket averaging about C$ 1,033. Cheapflights users have found deals in the month of February for as cheap as C$ 784. The most expensive prices can be found in the month of December.

What airport do you fly from for flights from Ottawa to London?

Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to London. You should not have trouble finding flights to London from Ottawa; the airport handles an average of 3 outbound flights to London per day. You should also have plenty of airline options to choose from since 8 airlines have flights from the Ottawa airport to London. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

Can I find deals for flights from Ottawa to London that include hotel bookings?

Yes. In addition to deals on Ottawa to London flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ottawa to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to London.

Can I find deals for business class flights from Ottawa to London?

Yes. Cheapflights offers flight deals from Ottawa to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

C$ 358+ Flights from Ottawa to London

Cheapflights Tip: The best prices from Ottawa to London are usually found in February or March, booked 54 days in advance, depart on a Saturday or Thursday and return on a Wednesday

Cheap flight deals from Ottawa to London

Round-trip from	C$ 955
One-way from	C$ 358
Popular in	December
Cheapest in	February
Average price	C$ 1,089
Good round-trip deal	C$ 1,058 or less
Good one-way deal	C$ 1,068 or less

26/9-5/10
3 total stops
41h 37m total
Ottawa to London

Search Deals

2/8
1 total stop
16h 50m total
Ottawa to London

Search Deals

Highest demand for flights based on searches. 6% potential increase in price (C$ 90 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (C$ 33 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in July 2025

Search Deals

Price to beat on a round-trip flight from Ottawa to London (LON).

Search Deals

Price to beat on a one-way flight from Ottawa to London (LON).

Search Deals

Find flight deals from Ottawa to London

Cheapest flights from Ottawa to London
Explore the most affordable flight options available from Ottawa to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 July 2025.

Fri 26/95:55 a.m.YOW - LGW

1 stop23h 50mMultiple Airlines

Sun 5/1011:35 a.m.LGW - YOW

2 stops17h 47mMultiple Airlines

Deal found 2/7C$ 955

Thu 2/105:15 a.m.YOW - LHR

2 stops20h 40mUnited Airlines

Sat 11/108:30 a.m.LHR - YOW

1 stop34h 34mUnited Airlines

Deal found 2/7C$ 955

Mon 11/82:20 p.m.YOW - LGW

1 stop15h 25mPorter Airlines

Mon 25/89:40 a.m.LGW - YOW

1 stop15h 56mPorter Airlines

Deal found 1/7C$ 970

Fri 10/105:15 p.m.YOW - LHR

1 stop9h 45mAir France

Fri 24/109:00 a.m.LHR - YOW

1 stop11h 05mAir France

Deal found 1/7C$ 1,000

Thu 4/98:35 a.m.YOW - LGW

1 stop21h 10mAir Transat

Thu 11/910:00 a.m.LGW - YOW

1 stop12h 21mAir Transat

Deal found 2/7C$ 1,002

Mon 25/87:00 a.m.YOW - LHR

1 stop9h 00mAir Canada

Wed 3/95:40 p.m.LHR - YOW

1 stop10h 24mAir Canada

Deal found 1/7C$ 1,021

Mon 21/76:55 p.m.YOW - LHR

Nonstop6h 35mMultiple Airlines

Thu 14/88:40 a.m.LHR - YOW

2 stops19h 28mMultiple Airlines

Deal found 1/7C$ 1,023

Mon 11/86:40 p.m.YOW - LHR

1 stop30h 50mLufthansa

Tue 26/89:30 a.m.LHR - YOW

1 stop17h 35mLufthansa

Deal found 1/7C$ 1,049

Wed 17/125:20 p.m.YOW - LHR

1 stop9h 40mVirgin Atlantic

Thu 25/129:00 a.m.LHR - YOW

1 stop11h 10mVirgin Atlantic

Deal found 2/7C$ 1,058

Wed 5/112:10 p.m.YOW - LCY

2 stops13h 25mAer Lingus

Wed 12/119:10 a.m.LCY - YOW

2 stops15h 07mAer Lingus

Deal found 1/7C$ 1,060

Tue 4/112:50 p.m.YOW - LCY

2 stops17h 00mSWISS

Tue 11/119:15 a.m.LCY - YOW

2 stops14h 23mSWISS

Deal found 1/7C$ 1,133

Sat 16/81:55 p.m.YOW - LTN

2 stops14h 35mMultiple Airlines

Sat 23/88:40 a.m.LTN - YOW

2 stops20h 42mMultiple Airlines

Deal found 2/7C$ 1,192

Best flights from Ottawa to London
Discover carefully curated flight deals from Ottawa to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 3 July 2025.

Fri 26/95:55 a.m.YOW - LGW

1 stop23h 50mMultiple Airlines

Sun 5/1011:35 a.m.LGW - YOW

2 stops17h 47mMultiple Airlines

Deal found 2/7C$ 955

Fri 12/93:55 p.m.YOW - LHR

2 stops14h 50mUnited Airlines

Sun 21/98:30 a.m.LHR - YOW

1 stop13h 36mUnited Airlines

Deal found 2/7C$ 955

Mon 11/811:20 a.m.YOW - LGW

1 stop18h 25mPorter Airlines

Mon 25/89:40 a.m.LGW - YOW

1 stop15h 56mPorter Airlines

Deal found 2/7C$ 970

Thu 4/98:35 a.m.YOW - LGW

1 stop21h 10mAir Transat

Mon 15/99:40 a.m.LGW - YOW

1 stop12h 41mAir Transat

Deal found 2/7C$ 1,002

Mon 25/87:00 a.m.YOW - LHR

1 stop9h 00mAir Canada

Wed 3/95:40 p.m.LHR - YOW

1 stop10h 24mAir Canada

Deal found 1/7C$ 1,021

Mon 11/86:40 p.m.YOW - LHR

1 stop30h 50mLufthansa

Tue 26/89:30 a.m.LHR - YOW

1 stop17h 35mLufthansa

Deal found 1/7C$ 1,049

Sun 31/87:55 p.m.YOW - LHR

1 stop10h 55mAustrian Airlines

Mon 29/96:00 a.m.LHR - YOW

2 stops23h 19mAustrian Airlines

Deal found 1/7C$ 1,073

Thu 25/911:55 a.m.YOW - LHR

2 stops15h 05mAer Lingus

Wed 1/109:10 p.m.LHR - YOW

2 stops32h 09mAer Lingus

Deal found 2/7C$ 1,083

Mon 28/73:55 p.m.YOW - LCY

2 stops35h 55mSWISS

Wed 20/87:20 p.m.LCY - YOW

2 stops32h 48mSWISS

Deal found 30/6C$ 1,175

Fri 26/95:15 p.m.YOW - LCY

2 stops11h 15mKLM

Sun 5/101:45 p.m.LCY - YOW

2 stops15h 37mKLM

Deal found 2/7C$ 1,873

Mon 21/76:55 p.m.YOW - LHR

Nonstop6h 35mMultiple Airlines

Thu 14/88:40 a.m.LHR - YOW

2 stops19h 28mMultiple Airlines

Deal found 1/7C$ 1,023

Sat 16/81:55 p.m.YOW - LTN

2 stops14h 35mMultiple Airlines

Sat 23/88:40 a.m.LTN - YOW

2 stops20h 42mMultiple Airlines

Deal found 2/7C$ 1,192

Direct flights from Ottawa to London
Explore direct flight options from Ottawa to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 3 July 2025.

Mon 25/86:55 p.m.YOW - LHR

Nonstop6h 35mMultiple Airlines

Wed 3/912:40 p.m.LHR - YOW

Nonstop7h 20mMultiple Airlines

Deal found 1/7C$ 1,023

Mon 25/86:55 p.m.YOW - LHR

Nonstop6h 35mAir Canada

Wed 3/912:40 p.m.LHR - YOW

Nonstop7h 20mAir Canada

Deal found 3/7C$ 1,030

Wed 10/99:00 p.m.YOW - LHR

Nonstop6h 35mLufthansa

Wed 17/912:40 p.m.LHR - YOW

Nonstop7h 20mLufthansa

Deal found 1/7C$ 1,049

Last-minute flights from Ottawa to London
Discover last-minute flight deals from Ottawa to London. Data last updated 3 July 2025 and is based on user searches.

Wed 9/711:20 a.m.YOW - LGW

1 stop18h 25mPorter Airlines

Mon 14/712:40 p.m.LGW - YOW

1 stop13h 31mPorter Airlines

Deal found 1/7C$ 1,323

Wed 9/71:55 p.m.YOW - LHR

2 stops14h 10mAer Lingus

Mon 14/77:40 a.m.LHR - YOW

2 stops16h 25mAer Lingus

Deal found 2/7C$ 1,678

Thu 10/76:55 p.m.YOW - LHR

Nonstop6h 35mMultiple Airlines

Thu 24/78:40 a.m.LHR - YOW

2 stops19h 28mMultiple Airlines

Deal found 1/7C$ 1,056

Thu 10/77:29 p.m.YOW - LHR

1 stop10h 11mUnited Airlines

Tue 15/78:30 a.m.LHR - YOW

1 stop13h 36mUnited Airlines

Deal found 1/7C$ 1,120

Thu 10/72:20 p.m.YOW - LGW

1 stop15h 25mAir Transat

Thu 17/712:40 p.m.LGW - YOW

1 stop16h 41mAir Transat

Deal found 3/7C$ 1,307

Thu 10/78:00 a.m.YOW - LHR

2 stops18h 55mSWISS

Thu 24/78:40 a.m.LHR - YOW

2 stops19h 28mSWISS

Deal found 1/7C$ 1,357

Thu 10/710:55 a.m.YOW - LGW

1 stop14h 25mMultiple Airlines

Thu 17/73:40 p.m.LGW - YOW

3 stops34h 21mMultiple Airlines

Deal found 3/7C$ 1,390

Thu 10/77:55 p.m.YOW - LHR

1 stop10h 55mAustrian Airlines

Tue 15/76:00 a.m.LHR - YOW

2 stops23h 20mAustrian Airlines

Deal found 2/7C$ 1,608

Sun 13/77:00 a.m.YOW - LHR

1 stop9h 00mAir Canada

Fri 18/712:40 p.m.LHR - YOW

1 stop24h 48mAir Canada

Deal found 3/7C$ 1,052

Sun 13/75:55 a.m.YOW - LHR

2 stops19h 30mDelta

Thu 17/78:10 p.m.LHR - YOW

2 stops33h 12mDelta

Deal found 3/7C$ 1,494

Sun 13/76:30 p.m.YOW - LHR

1 stop10h 30mLufthansa

Mon 4/82:05 p.m.LHR - YOW

Nonstop7h 20mLufthansa

Deal found 2/7C$ 1,611

Sun 13/75:15 p.m.YOW - LHR

2 stops12h 30mKLM

Mon 4/86:30 a.m.LHR - YOW

2 stops13h 35mKLM

Deal found 1/7C$ 1,644

One-way flights from Ottawa to London
Search for one-way flight options from Ottawa to London. Find affordable one-way fares based on user searches. Data last updated 3 July 2025.

Sat 2/88:30 a.m.YOW - LGW

1 stop16h 50mMultiple Airlines

Deal found 2/7C$ 358

Sun 5/105:55 a.m.YOW - LTN

2 stops28h 45mMultiple Airlines

Deal found 2/7C$ 403

Sun 5/105:55 a.m.YOW - STN

2 stops30h 00mMultiple Airlines

Deal found 2/7C$ 414

Fri 3/105:55 a.m.YOW - LHR

2 stops34h 35mMultiple Airlines

Deal found 2/7C$ 428

Wed 30/76:10 p.m.YOW - LHR

1 stop21h 50mAir Canada

Deal found 3/7C$ 469

Tue 8/72:20 p.m.YOW - LGW

1 stop12h 35mPorter Airlines

Deal found 2/7C$ 476

Wed 15/105:55 a.m.YOW - LGW

2 stops22h 30mWestJet

Deal found 3/7C$ 477

Thu 11/94:05 p.m.YOW - SEN

2 stops18h 40mMultiple Airlines

Deal found 1/7C$ 497

Tue 8/75:15 a.m.YOW - LHR

2 stops20h 05mUnited Airlines

Deal found 2/7C$ 518

Sun 20/73:55 p.m.YOW - LCY

2 stops35h 55mSWISS

Deal found 1/7C$ 529

Wed 15/105:55 a.m.YOW - LHR

2 stops25h 10mWestJet

Deal found 3/7C$ 529

Thu 11/91:25 p.m.YOW - LCY

3 stops22h 50mMultiple Airlines

Deal found 1/7C$ 568

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ottawa to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Fri 26/9

5:55 a.m.-10:45 a.m.

1 stop23h 50m

London Gatwick

Sun 5/10

11:35 a.m.-12:22 a.m.

2 stops17h 47m

C$ 955

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 12/9

3:55 p.m.-11:45 a.m.

2 stops14h 50m

London Heathrow

Sun 21/9

8:30 a.m.-5:06 p.m.

1 stop13h 36m

C$ 955

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Mon 11/8

2:20 p.m.-10:45 a.m.

1 stop15h 25m

London Gatwick

Mon 25/8

9:40 a.m.-8:36 p.m.

1 stop15h 56m

C$ 970

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Thu 4/9

8:35 a.m.-10:45 a.m.

1 stop21h 10m

London Gatwick

Mon 15/9

9:40 a.m.-5:21 p.m.

1 stop12h 41m

C$ 1,002

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 25/8

7:00 a.m.-9:00 p.m.

1 stop9h 00m

London Heathrow

Wed 3/9

5:40 p.m.-11:04 p.m.

1 stop10h 24m

C$ 1,021

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 21/7

6:55 p.m.-6:30 a.m.

Nonstop6h 35m

London Heathrow

Thu 14/8

8:40 a.m.-11:08 p.m.

2 stops19h 28m

C$ 1,023

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 11/8

6:55 p.m.-6:30 a.m.

Nonstop6h 35m

London Heathrow

Tue 26/8

9:30 a.m.-10:05 p.m.

1 stop17h 35m

C$ 1,049

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 31/8

7:55 p.m.-11:50 a.m.

1 stop10h 55m

London Heathrow

Mon 29/9

6:00 a.m.-12:19 a.m.

2 stops23h 19m

C$ 1,073

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Thu 25/9

11:55 a.m.-8:00 a.m.

2 stops15h 05m

London Heathrow

Wed 1/10

9:10 p.m.-12:19 a.m.

2 stops32h 09m

C$ 1,083

OttawaLondon

YOW - LCY

YOWLCY

Ottawa

Mon 28/7

3:55 p.m.-8:50 a.m.

2 stops35h 55m

London City

Wed 20/8

7:20 p.m.-11:08 p.m.

2 stops32h 48m

C$ 1,175

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/7

Showing 1-10 of 32 results

Best time to book a flight from Ottawa to London

Have a flexible travel schedule? Discover the best time to fly to London from Ottawa with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to London

How far ahead should I book a flight from Ottawa to London?

Booking 54 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ottawa to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Ottawa to London?

Currently, January is the cheapest month in which you can book a flight from Ottawa to London (average of C$ 560). Flying from Ottawa to London in July is currently the most expensive (average of C$ 857). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YOW to LON?

Unlike at noon, when flights are generally more expensive, you can save up to 6% on flights from Ottawa to London by exploring options for tickets in the morning.

What is the cheapest day to fly from Ottawa to London?

Travelers seeking maximum savings on their Ottawa to London flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing London

Check out reviews from past customers who have flown with Porter Airlines,KLM, andAir Transat from Ottawa to London to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Porter Airlines

8.0

Very good

298 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!

Porter Airlines

8.0

Very good

298 reviews

Porter Airlines

8.0

Very good

298 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

KLM

7.8

Good

1,366 reviews

Porter Airlines

8.0

Very good

298 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Air Transat

7.8

Good

407 reviews

Porter Airlines

8.0

Very good

298 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Austrian Airlines

7.6

Good

809 reviews

Porter Airlines

8.0

Very good

298 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

SWISS

7.5

Good

1,654 reviews

Porter Airlines

8.0

Very good

298 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Related info for your journey

What airport do you fly from for flights from Ottawa to London?
Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to London. You should not have trouble finding flights to London from Ottawa; the airport handles an average of 3 outbound flights to London per day. You should also have plenty of airline options to choose from since 8 airlines have flights from the Ottawa airport to London. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.
What are the cheapest airlines flying from Ottawa to London round-trip?
Our cheapest airline available from Ottawa to London is United Airlines. Our recent data shows that you can find tickets from as low as C$ 955 on this airline. Additional options worth looking into are Porter Airlines and Air Transat, starting at C$ 970 and C$ 1,002 round-trip. You may be able to fly from Ottawa to London for 7% less than the average price by searching for these airlines.
What are the cheapest airlines to fly from Ottawa to London one-way?
To fly one-way, consider booking your trip with Air Canada, which is currently one of the cheapest options available, starting at C$ 469. Porter Airlines flights start at C$ 476 while deals on WestJet start at C$ 477 one-way.
What are the most popular routes from Ottawa to London?
Most travellers choose Ottawa - London Heathrow, Ottawa - London Gatwick or Ottawa - London City when deciding on the best route from Ottawa to London.
What are the most reliable airlines from Ottawa to London?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Ottawa to London on time: Air Canada (77%), Aegean Airlines (77%), Austrian Airlines (77%).
What are the cheapest flights from Ottawa to London?
The cheapest flight price from Ottawa to London is C$ 966. On average you can expect to pay C$ 1,972. The most popular route, (Ottawa - London Heathrow), can usually be booked for C$ 895.
Can I find deals for flights from Ottawa to London that include hotel bookings?
Yes. In addition to deals on Ottawa to London flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ottawa to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to London.
Can I find deals for business class flights from Ottawa to London?
Yes. Cheapflights offers flight deals from Ottawa to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Ottawa to London?
Currently, January is the cheapest month in which you can book a flight from Ottawa to London (average of C$ 560). Flying from Ottawa to London in July is currently the most expensive (average of C$ 857). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Brentford

Sutton

Hounslow

Slough

Milton Keynes

Romford

Watford

Luton

Bromley

Bedford

Southall

Browse thousands of different options on Cheapflights for your next trip

Top 8 airlines flying from Ottawa to London

Airline	Cheapest	Average	Flexibility	On-time
Virgin Atlantic	CheapestC$ 722	AverageC$ 812	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Air France	CheapestC$ 722	AverageC$ 897	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Air Transat	CheapestC$ 785	AverageC$ 1,016	FlexibilityNo cancel fee	On-time50%	Search Air Transat flights
KLM	CheapestC$ 818	AverageC$ 1,213	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	CheapestC$ 887	AverageC$ 983	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	CheapestC$ 893	AverageC$ 1,036	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Porter Airlines	CheapestC$ 897	AverageC$ 1,049	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
Lufthansa	CheapestC$ 944	AverageC$ 1,047	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights

Fly with Cheapflights

How does Cheapflights help users find flights from Ottawa to London?

Cheapflights helps you search for flights from Ottawa to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to London?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ottawa to London for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Ottawa to London with no change fees?

Need flexible booking options for your flight to London from Ottawa? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to London become cheaper?

Yes! Start tracking prices for Ottawa to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from Ottawa to London from C$ 358

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/8. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Ottawa to London are usually found in February or March, booked 54 days in advance, depart on a Saturday or Thursday and return on a Wednesday

Cheap flight deals from Ottawa to London

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Find flight deals from Ottawa to London

Cheapest flights from Ottawa to LondonExplore the most affordable flight options available from Ottawa to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 July 2025.

Explore the most affordable flight options available from Ottawa to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 July 2025.

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Best time to book a flight from Ottawa to London

Have a flexible travel schedule? Discover the best time to fly to London from Ottawa with our price prediction graph.

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Everything you need to know about your flight from Ottawa to London

How far ahead should I book a flight from Ottawa to London?

Use this chart to determine the optimal time to book a round-trip flight from Ottawa to London. Price data was last updated on 27 June 2025.

What is the cheapest month to book a flight from Ottawa to London?

What is the cheapest time of day to fly from YOW to LON?

Find hourly flight availability from Ottawa to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 3 July 2025.

What is the cheapest day to fly from Ottawa to London?

Use this chart to determine the cheapest time to fly round-trip from Ottawa to London. Price data was last updated on 16 December 2024.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 3 July 2025.

Check out reviews from past customers who have flown with Porter Airlines,KLM, andAir Transat from Ottawa to London to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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Fly from Ottawa to London on these airlines

Choose from the following airlines for your flight from Ottawa to London. Flights are based on user searches made on Cheapflights and were last updated on 3 July 2025.

Top 8 airlines flying from Ottawa to London

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Cheapest flights from Ottawa to London
Explore the most affordable flight options available from Ottawa to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 July 2025.