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Cheap flights from Ottawa to London from C$ 371

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 18/6. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LON
4 May — 11 May1
1 adult

Cheapflights Tip: The best prices from Ottawa to London are usually found in February or March, booked 49 days in advance, depart on a Saturday or Sunday and return on a Monday

Cheap flight deals from Ottawa to London

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 29 April 2025.

Round-trip from

C$ 894

One-way from

C$ 371

Popular in

December

Cheapest in

February

Average price

C$ 991

Good round-trip deal

C$ 997 or less

Good one-way deal

C$ 863 or less
United Airlines
  • United Airlines
  • 3/6-10/6
  • 3 total stops
  • 25h 13m total
  • Ottawa to London
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18/6
  • 18/6
  • 2 total stops
  • 33h 05m total
  • Ottawa to London
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Highest demand for flights based on searches. 5% potential increase in price (C$ 85 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 33 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Ottawa to London (LON).
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Price to beat on a one-way flight from Ottawa to London (LON).
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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 29 April 2025.

Tue 3/62:40 p.m.YOW - LHR
1 stop11h 15mUnited Airlines
Tue 10/67:45 a.m.LHR - YOW
2 stops13h 58mUnited Airlines
Deal found 28/4C$ 894
Mon 23/64:40 p.m.YOW - LGW
1 stop13h 05mPorter Airlines
Sun 6/79:40 a.m.LGW - YOW
1 stop19h 41mPorter Airlines
Deal found 28/4C$ 897
Wed 28/55:55 a.m.YOW - LGW
1 stop23h 50mMultiple Airlines
Wed 11/611:35 a.m.LGW - YOW
2 stops17h 47mMultiple Airlines
Deal found 28/4C$ 899
Sun 15/64:40 p.m.YOW - LGW
1 stop13h 05mAir Transat
Sat 28/69:40 a.m.LGW - YOW
1 stop16h 21mAir Transat
Deal found 28/4C$ 902
Thu 6/115:20 p.m.YOW - LHR
1 stop18h 15mVirgin Atlantic
Sun 16/116:20 a.m.LHR - YOW
1 stop13h 50mVirgin Atlantic
Deal found 28/4C$ 902
Fri 16/58:55 p.m.YOW - LHR
1 stop28h 35mMultiple Airlines
Sat 31/54:40 p.m.LHR - YOW
1 stop26h 47mMultiple Airlines
Deal found 28/4C$ 977
Thu 8/57:00 a.m.YOW - LHR
1 stop9h 00mAir Canada
Wed 14/59:30 a.m.LHR - YOW
1 stop17h 37mAir Canada
Deal found 28/4C$ 999
Fri 13/62:10 p.m.YOW - STN
2 stops26h 10mMultiple Airlines
Mon 23/68:30 a.m.STN - YOW
2 stops20h 52mMultiple Airlines
Deal found 28/4C$ 1,012
Fri 13/62:10 p.m.YOW - LTN
2 stops26h 35mMultiple Airlines
Mon 23/68:50 a.m.LTN - YOW
2 stops20h 32mMultiple Airlines
Deal found 28/4C$ 1,027
Fri 20/68:55 p.m.YOW - LHR
1 stop28h 35mLufthansa
Thu 3/711:30 a.m.LHR - YOW
2 stops15h 35mLufthansa
Deal found 28/4C$ 1,028
Thu 8/56:40 p.m.YOW - LHR
2 stops14h 00mSWISS
Wed 14/57:00 a.m.LHR - YOW
2 stops18h 17mSWISS
Deal found 28/4C$ 1,041
Tue 6/53:55 p.m.YOW - LGW
2 stops20h 55mSWISS
Sat 13/96:40 p.m.LGW - YOW
2 stops33h 24mSWISS
Deal found 28/4C$ 1,042

Cheapflights Fare Finder

Customize your flight search to find flights from Ottawa to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 April 2025.
Use the filters below to find and compare flights from Ottawa to London that are best for you.

Fly from

Ottawa

Fly to

London

Route

Depart

Return

Price

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 3/6

2:40 p.m.-6:55 a.m.

1 stop11h 15m

London Heathrow

Tue 10/6

7:45 a.m.-4:43 p.m.

2 stops13h 58m

C$ 894

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Mon 23/6

4:40 p.m.-10:45 a.m.

1 stop13h 05m

London Gatwick

Sun 6/7

9:40 a.m.-12:21 a.m.

1 stop19h 41m

C$ 897

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Wed 28/5

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

1 stop23h 50m

London Gatwick

Wed 11/6

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

2 stops17h 47m

C$ 899

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 15/6

4:40 p.m.-10:45 a.m.

1 stop13h 05m

London Gatwick

Sat 28/6

9:40 a.m.-9:01 p.m.

1 stop16h 21m

C$ 902

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 16/5

8:55 p.m.-6:30 a.m.

1 stop28h 35m

London Heathrow

Sat 31/5

4:40 p.m.-2:27 p.m.

1 stop26h 47m

C$ 977

OttawaLondon

YOW - STN

YOWSTN

Ottawa

Fri 13/6

2:10 p.m.-9:20 p.m.

2 stops26h 10m

London Stansted

Mon 23/6

8:30 a.m.-12:22 a.m.

2 stops20h 52m

C$ 1,012

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 15/6

6:40 p.m.-9:35 a.m.

1 stop9h 55m

London Heathrow

Mon 23/6

2:05 p.m.-4:25 p.m.

Nonstop7h 20m

C$ 1,016

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Fri 13/6

2:10 p.m.-9:45 p.m.

2 stops26h 35m

London Luton

Mon 23/6

8:50 a.m.-12:22 a.m.

2 stops20h 32m

C$ 1,027

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 20/6

8:55 p.m.-6:30 a.m.

1 stop28h 35m

London Heathrow

Thu 3/7

11:30 a.m.-10:05 p.m.

2 stops15h 35m

C$ 1,028

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 10/6

3:55 p.m.-5:50 p.m.

2 stops20h 55m

London Heathrow

Tue 17/6

7:00 a.m.-8:17 p.m.

2 stops18h 17m

C$ 1,066

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/4

Showing 1-10 of 42 results
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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.
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?

Use this chart to determine the optimal time to book a round-trip flight from Ottawa to London. Price data was last updated on 25 April 2025.

Booking 49 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$ 870). 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?

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 29 April 2025.

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?

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.

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

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

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.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

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).

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 29 April 2025.
See what other customers who have flown with Delta, Porter Airlines and KLM from Ottawa to London have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,929 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Porter Airlines
8.0
Very good
285 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Transat
7.8
Good
385 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Austrian Airlines
7.6
Good
780 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

  • 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 4 outbound flights to London per day. You should also have plenty of airline options to choose from since 6 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$ 894 on this airline. Additional options worth looking into are Porter Airlines and Air Transat, starting at C$ 897 and C$ 902 round-trip. You may be able to fly from Ottawa to London for 15% 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 WestJet, which is currently one of the cheapest options available, starting at C$ 442. Air Canada flights start at C$ 560 while deals on Lufthansa start at C$ 595 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 (89%), Aegean Airlines (89%), Austrian Airlines (89%).

  • What are the cheapest flights from Ottawa to London?

    The cheapest flight price from Ottawa to London is C$ 823. On average you can expect to pay C$ 1,556. The most popular route, (Ottawa - London Heathrow), can usually be booked for C$ 883.

  • 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$ 870). 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

Travelling to a place near Ottawa?

Book flights to Ottawa if you plan to visit one of these locations
Brentford
Hounslow
Sutton
Slough
Milton Keynes
Romford
Watford
Luton
Bromley
Bedford
Southall

Browse thousands of different options on Cheapflights for your next trip

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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 29 April 2025.
Air Canada flights from Ottawa to London
Lufthansa flights from Ottawa to London
Air Transat flights from Ottawa to London

Top 6 airlines flying from Ottawa to London

Discover the top 6 airlines that operate flights from Ottawa to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapestC$ 734AverageC$ 826FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapestC$ 735AverageC$ 924FlexibilityNo cancel feeOn-time77%
Search Air France flights
Air TransatCheapestC$ 798AverageC$ 1,038FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Porter AirlinesCheapestC$ 906AverageC$ 1,070FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 909AverageC$ 1,071FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapestC$ 952AverageC$ 1,053FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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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