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Cheap flights from Ottawa to London from £162

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 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LON
24 Jun — 1 Jul1
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 Thursday and return on a Friday

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 25 May 2026.

Fri 19/616:00
YOW
-
LGW
1 stop13h 45m
Air Transat
Thu 2/712:40
LGW
-
YOW
1 stop16h 45m
Air Transat
Deal found 22/5£429
Sun 4/1019:40
YOW
-
LGW
Nonstop7h 15m
Air Transat
Thu 22/1012:40
LGW
-
YOW
1 stop12h 20m
Air Transat
Deal found 22/5£429
Sun 4/1016:00
YOW
-
LGW
1 stop13h 45m
Air Transat
Fri 23/1009:40
LGW
-
YOW
Nonstop8h 00m
Air Transat
Deal found 22/5£432
Fri 28/819:40
YOW
-
LGW
Nonstop7h 15m
Air Transat
Sun 20/909:40
LGW
-
YOW
Nonstop8h 00m
Air Transat
Deal found 25/5£432
Sun 24/518:45
YOW
-
LGW
1 stop11h 00m
Air Transat
Tue 2/612:40
LGW
-
YOW
1 stop16h 45m
Air Transat
Deal found 23/5£434
Sun 14/614:15
YOW
-
LGW
1 stop14h 35m
Air Transat
Sun 21/611:35
LGW
-
YOW
1 stop11h 00m
Air Transat
Deal found 24/5£435
Fri 22/519:40
YOW
-
LGW
Nonstop7h 15m
Air Transat
Sun 7/612:40
LGW
-
YOW
1 stop16h 45m
Air Transat
Deal found 20/5£436
Tue 1/918:25
YOW
-
STN
2 stops23h 15m
Multiple Airlines
Fri 11/922:50
STN
-
YOW
3 stops30h 30m
Multiple Airlines
Deal found 24/5£436
Fri 19/608:40
YOW
-
LGW
1 stop21h 05m
Air Transat
Fri 3/709:40
LGW
-
YOW
Nonstop8h 00m
Air Transat
Deal found 21/5£437
Sun 9/806:55
YOW
-
STN
2 stops34h 00m
Multiple Airlines
Sun 6/906:35
STN
-
YOW
2 stops22h 45m
Multiple Airlines
Deal found 24/5£438
Fri 28/806:55
YOW
-
STN
2 stops35h 10m
Multiple Airlines
Wed 9/906:30
STN
-
YOW
3 stops22h 50m
Multiple Airlines
Deal found 24/5£453
Tue 1/918:25
YOW
-
STN
2 stops23h 15m
Multiple Airlines
Fri 18/922:00
STN
-
YOW
3 stops24h 35m
Multiple Airlines
Deal found 21/5£454

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 25 May 2026.

Round-trip from

£428

One-way from

£162

Popular in

December

Cheapest in

February

Average price

£530

Good round-trip deal

£443 or less

Good one-way deal

£387 or less
Air Transat
  • Air Transat
  • 4/9-11/9
  • 1 total stop
  • 29h 05m total
  • Ottawa to London
Search Deals
3/6
  • 3/6
  • 2 total stops
  • 21h 05m total
  • Ottawa to London
Search Deals
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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

 
Customise 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 858,174 searches. Data last updated 25 May 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 return flight

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 14/6

14:15-09:50

1 stop14h 35m

London Gatwick

Wed 17/6

12:40-00:25

1 stop16h 45m

£444

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Thu 25/6

16:00-07:55

1 stop10h 55m

London Gatwick

Wed 1/7

12:40-20:05

1 stop12h 25m

£447

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Wed 22/7

06:55-16:35

2 stops28h 40m

London Luton

Sat 1/8

21:25-17:35

2 stops25h 10m

£464

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 7/6

14:35-06:30

1 stop10h 55m

London Heathrow

Thu 11/6

09:30-12:25

Nonstop7h 55m

£483

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 1/9

19:30-10:00

1 stop9h 30m

London Heathrow

Sat 12/9

14:10-17:05

Nonstop7h 55m

£484

OttawaLondon

YOW - STN

YOWSTN

Ottawa

Sat 15/8

18:25-23:20

2 stops23h 55m

London Stansted

Sat 22/8

06:35-17:35

2 stops16h 00m

£501

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Tue 11/8

06:55-18:30

2 stops30h 35m

London Luton

Wed 19/8

18:10-19:40

3 stops30h 30m

£503

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 15/9

17:57-10:25

1 stop11h 28m

London Heathrow

Tue 22/9

08:45-23:54

2 stops20h 09m

£508

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 14/6

18:35-10:45

1 stop11h 10m

London Gatwick

Sat 20/6

09:40-00:25

1 stop19h 45m

£510

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 11/9

12:00-07:15

2 stops14h 15m

London Heathrow

Sun 20/9

06:50-16:38

2 stops14h 48m

£518

Flights are sorted by cheapest return flights first.

Deals found on 24/5

Showing 1-10 of 60 resultsSorted by cheapest first
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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 return 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 £287). Flying from Ottawa to London in August is currently the most expensive (average of £454). 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 25 May 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ottawa to London as you normally would.

How much does it cost for a return flight from Ottawa to London?

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

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

Toronto (YYZ) – chosen by Cheapflights users on 50% of one-stop itineraries from Ottawa to London on Cheapflights.

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

Average return fare for one-stop flights from Ottawa to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Washington, D.C. (IAD) is the most affordable one-stop option, with an average return flight price of £493.

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

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

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

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

Average stopover duration for one-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 stopover time of 1h 16m.

How often are flights from Ottawa to London delayed?

About 25% of weekly flights between Ottawa and London have experienced delays in the past year, with the average delay time being 142 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?

Monday 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 have had the lowest number of delays on this route, with just 25% of flights being delayed.

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

The price you pay for your flight from Ottawa to London may vary depending on when you book. For the best chance of a lower fare, look to book 90 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 25 May 2026.
Check out reviews from past customers who have flown with Air Transat and Air Canada 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.
Air Transat
7.8
Good
553 reviews
Check prices

Entertainment

7.1

Food

6.8

Comfort

7.3

Boarding

7.9

Overall

7.8

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Dec 2025

YOW - GCM

The flight was delayed for 3.5 hours. No compensation for a meal voucher. We were positioned at the back of the plane and the toilets were not working properly. It was a foul smell coming from the toilet.
Air Transat
7.8
Good
553 reviews
Air Transat
7.8
Good
553 reviews
Check prices

Entertainment

7.1

Food

6.8

Comfort

7.3

Boarding

7.9

Overall

7.8

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Dec 2025

YOW - GCM

The flight was delayed for 3.5 hours. No compensation for a meal voucher. We were positioned at the back of the plane and the toilets were not working properly. It was a foul smell coming from the toilet.
Air Canada
7.1
Good
11,084 reviews
Air Transat
7.8
Good
553 reviews
Check prices

Entertainment

7.1

Food

6.8

Comfort

7.3

Boarding

7.9

Overall

7.8

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Dec 2025

YOW - GCM

The flight was delayed for 3.5 hours. No compensation for a meal voucher. We were positioned at the back of the plane and the toilets were not working properly. It was a foul smell coming from the toilet.

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?

    Most people fly from Ottawa (YOW) if they book a flight from Ottawa to London. On average, Ottawa has 2 outbound flights to London per day from 1 airline. Ottawa is conveniently located just 6.6 mi from Ottawa’s city center.

  • How long is the flight from Ottawa to London?

    A quick flight from Ottawa to London can take about 10h 55m. Porter Airlines provides one of the quickest options available for as low as £447. The distance between Ottawa and London is about 3340 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    Cheapflights users have booked flights from Ottawa to London round-trip from £481. Air Canada is priced at 13% lower than the current average price of a flight leaving 3 months from now.

  • What are the most popular routes from Ottawa to London?

    While some choose either Ottawa - London Gatwick or Ottawa - London Stansted, Ottawa - London Heathrow is the most popular route from Ottawa to London.

  • What are the most reliable airlines from Ottawa to London?

    The top 3 most reliable airlines when flying from Ottawa to London are Croatia Airlines (100%), United Airlines (71%) and TAP AIR PORTUGAL (70%).

  • 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 holiday 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 £287). Flying from Ottawa to London in August is currently the most expensive (average of £454). 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
Hounslow
Milton Keynes
Wembley
Luton
Gatwick
Croydon
Ilford
Slough
Hayes
Brentford
Colchester
Kingston upon Thames
Eastbourne
Ipswich
Watford
Romford
Guildford
Borehamwood
Southall
Southend-on-Sea

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Ottawa to London

Discover the top airline 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 858,174 searches. Data last updated 25 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest£481Average£625FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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

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Cheapflights helps you find that perfect flight to London from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Yes, we can. To see specific flights from Ottawa to London with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Not ready to book yet? You can track prices for flights from Ottawa to London on Cheapflights with our Price Alert feature and get notified when better prices are available.

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