Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Ottawa to London from C$ 355

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 21/9. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LON
3 Sep — 10 Sep1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Ottawa to London are usually found in February or January, booked 74 days in advance, depart on a Tuesday or Friday and return on a Monday

Cheap flight deals from Ottawa to London

Enter your travel dates to find the best prices.

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 4 August 2026.

Sun 13/97:40 p.m. -
Nonstop7h 15m
Tue 22/99:40 a.m. -
Nonstop8h 00m
Deal found 3/8C$ 642
Sun 13/97:40 p.m. -
Nonstop7h 15m
Sun 20/911:35 a.m. -
1 stop11h 00m
Deal found 30/7C$ 649
Tue 8/97:40 p.m. -
Nonstop7h 15m
Fri 18/99:40 a.m. -
Nonstop8h 00m
Deal found 3/8C$ 677
Tue 15/97:40 p.m. -
Nonstop7h 15m
Fri 25/912:40 p.m. -
1 stop12h 20m
Deal found 2/8C$ 686
Thu 15/105:50 p.m. -
1 stop11h 10m
Sat 17/109:30 a.m. -
2 stops40h 20m
Deal found 2/8C$ 747
Thu 15/106:25 p.m. -
2 stops23h 00m
Wed 21/1010:00 p.m. -
3 stops31h 20m
Deal found 31/7C$ 849
Thu 17/96:55 p.m. -
Nonstop6h 35m
Thu 24/96:00 a.m. -
2 stops21h 10m
Deal found 3/8C$ 849
Sun 13/912:15 p.m. -
1 stop27h 45m
Tue 22/912:40 p.m. -
1 stop24h 45m
Deal found 3/8C$ 852
Tue 4/86:25 p.m. -
2 stops23h 15m
Tue 25/810:00 p.m. -
3 stops31h 20m
Deal found 30/7C$ 855
Sun 13/95:30 p.m. -
1 stop22h 30m
Sun 20/99:30 a.m. -
1 stop17h 40m
Deal found 30/7C$ 856
Wed 16/99:00 p.m. -
Nonstop6h 35m
Wed 23/912:40 p.m. -
1 stop11h 10m
Deal found 2/8C$ 858
Wed 2/97:30 p.m. -
1 stop9h 30m
Thu 10/912:40 p.m. -
1 stop11h 10m
Deal found 31/7C$ 866

Find 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 4 August 2026.

Round-trip from

C$ 642

One-way from

C$ 355

Popular in

December

Cheapest in

February

Average price

C$ 1,103

Good round-trip deal

C$ 686 or less

Good one-way deal

C$ 464 or less
Air Transat
  • Air Transat
  • 13/9-22/9
  • Nonstop
  • 15h 15m total
  • Ottawa to London
Search Deals
Porter Airlines
  • Porter Airlines
  • 21/9
  • 1 total stop
  • 13h 45m total
  • Ottawa to London
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 5 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
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

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 4 August 2026.
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

Cheapest round-trip

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sat 19/9

10:00 a.m.-7:55 a.m.

1 stop16h 55m

London Gatwick

Mon 12/10

9:40 a.m.-8:00 p.m.

1 stop15h 20m

C$ 810

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sat 10/10

8:40 a.m.-7:55 a.m.

1 stop18h 15m

London Gatwick

Wed 14/10

12:40 p.m.-12:25 a.m.

1 stop16h 45m

C$ 827

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Tue 15/9

2:45 p.m.-2:00 p.m.

2 stops18h 15m

London Luton

Fri 25/9

8:00 a.m.-10:10 p.m.

3 stops19h 10m

C$ 915

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Thu 17/9

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

1 stop19h 45m

London Gatwick

Thu 24/9

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

1 stop24h 25m

C$ 925

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 31/8

5:57 p.m.-8:40 p.m.

1 stop21h 43m

London Heathrow

Mon 7/9

6:55 a.m.-9:56 a.m.

2 stops32h 01m

C$ 953

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 6/9

6:05 a.m.-10:40 a.m.

2 stops23h 35m

London Heathrow

Sun 13/9

6:50 a.m.-9:56 a.m.

2 stops32h 06m

C$ 956

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 1/9

10:25 a.m.-8:20 a.m.

2 stops16h 55m

London Heathrow

Sun 13/9

6:50 a.m.-11:54 p.m.

2 stops22h 04m

C$ 956

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 8/9

6:00 a.m.-5:55 a.m.

2 stops18h 55m

London Heathrow

Fri 18/9

6:50 a.m.-9:11 a.m.

2 stops31h 21m

C$ 956

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 4/10

6:05 a.m.-6:55 a.m.

2 stops19h 50m

London Heathrow

Sun 11/10

6:50 a.m.-9:56 a.m.

2 stops32h 06m

C$ 957

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 19/9

4:00 p.m.-10:40 a.m.

2 stops13h 40m

London Heathrow

Wed 23/9

6:50 a.m.-4:38 p.m.

2 stops14h 48m

C$ 967

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/7

Showing 1-10 of 60 resultsSorted by cheapest first
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

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

Currently, February is the cheapest month in which you can book a flight from Ottawa to London (average of C$ 925). Flying from Ottawa to London in December is currently the most expensive (average of C$ 1,277). 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 4 August 2026.

When flying from Ottawa to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Ottawa to London?

Airfare is below average for this route at the moment.
Ottawa to London flights typically cost between C$ 995 and C$ 1,240 in September.
The cheapest round-trip price found within the last 5 days was C$ 642 on Air Transat (13 Sep-22 Sep).

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 41% 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.

Toronto (YYZ) is the most affordable 1-stop option, with an average round-trip price of C$ 938.

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 Paris (CDG) offer the fastest connection on this route, with an average layover time of 1h 38m.

How often are flights from Ottawa to London delayed?

About 26% of weekly flights between Ottawa and London have experienced delays in the past year, with the average delay time being 125 minutes.

What is the most punctual flight time for Ottawa to London flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Ottawa to London flights?

Over the past year, Air Canada has had the lowest number of delays on this route, with just 27% of flights being delayed.

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

Booking 50 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.

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 4 August 2026.
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
450 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Porter Airlines
8.0
Very good
450 reviews
Porter Airlines
8.0
Very good
450 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Air Transat
7.8
Good
569 reviews
Porter Airlines
8.0
Very good
450 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Air France
7.5
Good
1,632 reviews
Porter Airlines
8.0
Very good
450 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Air Canada
7.1
Good
11,424 reviews
Porter Airlines
8.0
Very good
450 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Lufthansa
6.8
Okay
8,176 reviews
Porter Airlines
8.0
Very good
450 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

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 0 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.

  • How long is the flight from Ottawa to London?

    Departing from Ottawa to London will take you 16h 55m. 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 Air Transat. Our recent data shows that you can find tickets from as low as C$ 686 on this airline. Additional options worth looking into are Porter Airlines and Air France, starting at C$ 766 and C$ 791 round-trip. You may be able to fly from Ottawa to London for 33% 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 (65%), Aegean Airlines (65%), Austrian Airlines (65%).

  • What are the cheapest flights from Ottawa to London?

    The cheapest flight price from Ottawa to London is C$ 510. On average you can expect to pay C$ 1,170. The most popular route, (Ottawa - London Heathrow), can usually be booked for C$ 882.

  • 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, February is the cheapest month in which you can book a flight from Ottawa to London (average of C$ 925). Flying from Ottawa to London in December is currently the most expensive (average of C$ 1,277). 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
Gatwick
Romford
Twickenham
Ilford
Bromley
Sutton
Luton
Slough
Marlow
Cobham
Hounslow
Watford
High Wycombe

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 4 August 2026.
Air Canada flights from Ottawa to London
Air Transat flights from Ottawa to London
Lufthansa 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 4 August 2026.
AirlineCheapestAverageFlexibilityOn-time
Air TransatCheapestC$ 686AverageC$ 819FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Porter AirlinesCheapestC$ 766AverageC$ 1,111FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air FranceCheapestC$ 791AverageC$ 1,042FlexibilityNo cancel feeOn-time77%
Search Air France flights
Air CanadaCheapestC$ 901AverageC$ 1,108FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 905AverageC$ 1,231FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapestC$ 924AverageC$ 1,162FlexibilityNo 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.