Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Ottawa to London from C$ 351

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 18/11. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LON
23 Aug — 30 Aug1
1 adult

Cheapflights Tip: The best prices from Ottawa to London are usually found in February or March, booked 62 days in advance, depart on a Friday or Thursday and return on a Wednesday

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 18 August 2025.

Round-trip from

C$ 984

One-way from

C$ 374

Popular in

December

Cheapest in

February

Average price

C$ 1,075

Good round-trip deal

C$ 1,097 or less

Good one-way deal

C$ 1,012 or less
WestJet
  • WestJet
  • 10/9-3/10
  • 4 total stops
  • 41h 07m total
  • Ottawa to London
Search Deals
26/10
  • 26/10
  • 2 total stops
  • 38h 10m total
  • Ottawa to London
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 74 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 18 August 2025.

Fri 5/98:00 a.m.YOW - LGW
2 stops20h 25mMultiple Airlines
Fri 12/92:00 p.m.LGW - YOW
1 stop31h 57mMultiple Airlines
Deal found 18/8C$ 982
Wed 10/95:55 a.m.YOW - LGW
2 stops22h 30mMultiple Airlines
Fri 26/910:45 a.m.LGW - YOW
1 stop33h 01mMultiple Airlines
Deal found 17/8C$ 984
Sat 27/94:25 p.m.YOW - LGW
1 stop36h 45mMultiple Airlines
Sat 11/1010:45 a.m.LGW - YOW
1 stop33h 01mMultiple Airlines
Deal found 17/8C$ 989
Sun 28/128:05 p.m.YOW - LHR
1 stop30h 05mAir Canada
Fri 16/19:00 a.m.LHR - YOW
1 stop10h 21mAir Canada
Deal found 15/8C$ 989
Thu 4/98:30 p.m.YOW - LGW
1 stop31h 55mMultiple Airlines
Fri 12/92:00 p.m.LGW - YOW
1 stop31h 57mMultiple Airlines
Deal found 18/8C$ 992
Wed 10/99:00 p.m.YOW - LHR
Nonstop6h 35mAir Canada
Wed 1/1012:40 p.m.LHR - YOW
Nonstop7h 20mAir Canada
Deal found 16/8C$ 992
Sun 7/97:50 a.m.YOW - LGW
2 stops20h 35mMultiple Airlines
Fri 12/92:00 p.m.LGW - YOW
1 stop31h 57mMultiple Airlines
Deal found 18/8C$ 995
Fri 5/98:00 a.m.YOW - LGW
2 stops20h 25mMultiple Airlines
Thu 11/92:00 p.m.LGW - YOW
1 stop31h 57mMultiple Airlines
Deal found 18/8C$ 996
Thu 2/105:55 a.m.YOW - LGW
1 stop23h 50mMultiple Airlines
Wed 8/1010:45 a.m.LGW - YOW
1 stop33h 01mMultiple Airlines
Deal found 17/8C$ 1,002
Wed 8/1010:50 a.m.YOW - LGW
1 stop14h 30mMultiple Airlines
Tue 14/1010:45 a.m.LGW - YOW
1 stop25h 34mMultiple Airlines
Deal found 18/8C$ 1,003
Sat 25/105:55 a.m.YOW - LGW
2 stops27h 45mMultiple Airlines
Mon 3/1111:55 a.m.LGW - YOW
2 stops17h 47mMultiple Airlines
Deal found 18/8C$ 1,004
Thu 4/98:30 p.m.YOW - LGW
1 stop31h 55mMultiple Airlines
Thu 11/92:00 p.m.LGW - YOW
1 stop31h 57mMultiple Airlines
Deal found 18/8C$ 1,006

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 18 August 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 - LGW

YOWLGW

Ottawa

Fri 19/9

5:55 a.m.-9:25 a.m.

2 stops22h 30m

London Gatwick

Sat 4/10

10:45 a.m.-12:22 a.m.

2 stops18h 37m

C$ 984

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Wed 10/9

5:55 a.m.-9:25 a.m.

2 stops22h 30m

London Gatwick

Fri 26/9

10:45 a.m.-2:46 p.m.

1 stop33h 01m

C$ 984

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Wed 8/10

7:00 a.m.-10:45 a.m.

1 stop22h 45m

London Gatwick

Sun 19/10

12:40 p.m.-8:05 a.m.

1 stop24h 25m

C$ 984

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sat 13/9

5:55 a.m.-9:25 a.m.

2 stops22h 30m

London Gatwick

Fri 3/10

10:45 a.m.-12:22 a.m.

2 stops18h 37m

C$ 984

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sat 11/10

10:45 a.m.-10:45 a.m.

1 stop19h 00m

London Gatwick

Sun 19/10

12:40 p.m.-9:00 p.m.

1 stop13h 20m

C$ 984

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Wed 1/10

10:50 a.m.-6:20 a.m.

1 stop14h 30m

London Gatwick

Sat 18/10

10:45 a.m.-2:46 p.m.

1 stop33h 01m

C$ 984

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Thu 11/9

5:55 a.m.-9:25 a.m.

2 stops22h 30m

London Gatwick

Fri 3/10

10:45 a.m.-12:22 a.m.

2 stops18h 37m

C$ 984

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sat 20/9

5:55 a.m.-9:25 a.m.

2 stops22h 30m

London Gatwick

Sat 4/10

10:45 a.m.-2:46 p.m.

1 stop33h 01m

C$ 984

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Wed 10/9

5:55 a.m.-9:25 a.m.

2 stops22h 30m

London Gatwick

Fri 3/10

10:45 a.m.-12:22 a.m.

2 stops18h 37m

C$ 984

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Fri 19/9

5:55 a.m.-9:25 a.m.

2 stops22h 30m

London Gatwick

Sat 4/10

10:45 a.m.-2:46 p.m.

1 stop33h 01m

C$ 987

Flights are sorted by cheapest round-trip flights first.

Deals found on 18/8

Showing 1-10 of 60 results
1
2
3
...
6

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 8 August 2025.

Booking 62 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$ 856). 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 18 August 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 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.

What’s the top layover airport for flights from Ottawa to London?

Share of one-stop round-trip flights from Ottawa to London chosen by Cheapflights users in the past 12 months, using the same layover each way.

Toronto (YYZ) – chosen by Cheapflights users on 48% of one-stop itineraries from Ottawa to London on Cheapflights.

What’s the cheapest layover airport for flights from Ottawa to London?

Average round-trip fare for 1-stop flights from Ottawa to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Chicago (ORD) is the most affordable 1-stop option, with an average round-trip price of C$ 904.

What’s the fastest layover option from Ottawa to London?

Shortest average travel time for 1-stop one-way flights from Ottawa to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Halifax (YHZ) have the shortest average one-way travel time for 1-stop routes: 9h 00m.

Which airport typically offers the quickest layover for flights from Ottawa to London?

Average layover duration for 1-stop one-way flights from Ottawa to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Halifax (YHZ) offer the fastest connection on this route, with an average layover time of 1h 01m.

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 18 August 2025.
Check out reviews from past customers who have flown with Porter Airlines,Air Transat, andAir France 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
334 reviews
Check prices

Crew

8.7

Entertainment

7.0

Comfort

8.0

Food

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Porter Airlines
8.0
Very good
334 reviews
Porter Airlines
8.0
Very good
334 reviews
Check prices

Crew

8.7

Entertainment

7.0

Comfort

8.0

Food

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Air Transat
7.7
Good
429 reviews
Porter Airlines
8.0
Very good
334 reviews
Check prices

Crew

8.7

Entertainment

7.0

Comfort

8.0

Food

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Air France
7.4
Good
1,469 reviews
Porter Airlines
8.0
Very good
334 reviews
Check prices

Crew

8.7

Entertainment

7.0

Comfort

8.0

Food

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Air Canada
7.1
Good
9,992 reviews
Porter Airlines
8.0
Very good
334 reviews
Check prices

Crew

8.7

Entertainment

7.0

Comfort

8.0

Food

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Lufthansa
6.8
Okay
7,330 reviews
Porter Airlines
8.0
Very good
334 reviews
Check prices

Crew

8.7

Entertainment

7.0

Comfort

8.0

Food

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good 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 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.

  • How long is the flight from Ottawa to London?

    Departing from Ottawa to London will take you 22h 30m. The distance between Ottawa and London is about 5375 km. Both multi-stop and direct flights can be found to your destination and back.

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

    Our cheapest airline available from Ottawa to London is Virgin Atlantic. Our recent data shows that you can find tickets from as low as C$ 732 on this airline. Additional options worth looking into are Air France and Air Transat, starting at C$ 732 and C$ 796 round-trip. You may be able to fly from Ottawa to London for 29% less than the average price by searching for these airlines.

  • 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 (82%), Aegean Airlines (82%), Austrian Airlines (82%).

  • What are the cheapest flights from Ottawa to London?

    The cheapest flight price from Ottawa to London is C$ 473. On average you can expect to pay C$ 1,107. The most popular route, (Ottawa - London Heathrow), can usually be booked for C$ 823.

  • 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$ 856). 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 London?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 18 August 2025.
Air Canada flights from Ottawa to London
Lufthansa flights from Ottawa to London
Air Transat flights from Ottawa to London

Top 8 airlines flying from Ottawa to London

Discover the top 8 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 18 August 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapestC$ 732AverageC$ 820FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapestC$ 732AverageC$ 918FlexibilityNo cancel feeOn-time77%
Search Air France flights
Air TransatCheapestC$ 796AverageC$ 1,022FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
KLMCheapestC$ 830AverageC$ 1,229FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapestC$ 891AverageC$ 977FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 905AverageC$ 1,055FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Porter AirlinesCheapestC$ 909AverageC$ 1,167FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
LufthansaCheapestC$ 957AverageC$ 1,065FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.