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Cheap flights from Ottawa to London from £189

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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LON
13 Jun — 20 Jun1
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 Saturday or Tuesday and return on a Sunday

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 14 May 2026.

Fri 19/619:40
YOW
-
LGW
Nonstop7h 15m
Air Transat
Sun 21/612:40
LGW
-
YOW
1 stop16h 45m
Air Transat
Deal found 11/5£441
Tue 26/516:00
YOW
-
LGW
1 stop13h 45m
Porter Airlines
Mon 1/609:40
LGW
-
YOW
1 stop19h 45m
Porter Airlines
Deal found 13/5£441
Tue 26/516:00
YOW
-
LGW
1 stop13h 45m
Air Transat
Tue 2/609:40
LGW
-
YOW
Nonstop8h 00m
Air Transat
Deal found 13/5£442
Tue 9/618:25
YOW
-
STN
2 stops14h 00m
Multiple Airlines
Tue 16/608:30
STN
-
YOW
2 stops14h 05m
Multiple Airlines
Deal found 12/5£442
Tue 26/516:00
YOW
-
LGW
1 stop13h 45m
Air Transat
Tue 9/609:40
LGW
-
YOW
Nonstop8h 00m
Air Transat
Deal found 12/5£443
Wed 17/607:00
YOW
-
LGW
1 stop22h 45m
Air Transat
Tue 30/611:35
LGW
-
YOW
1 stop11h 00m
Air Transat
Deal found 11/5£444
Fri 22/519:15
YOW
-
LGW
1 stop31h 40m
Porter Airlines
Tue 2/612:40
LGW
-
YOW
1 stop31h 15m
Porter Airlines
Deal found 12/5£445
Fri 12/618:25
YOW
-
STN
2 stops23h 40m
Multiple Airlines
Mon 15/622:00
STN
-
YOW
2 stops24h 35m
Multiple Airlines
Deal found 12/5£446
Tue 26/508:40
YOW
-
LGW
1 stop21h 05m
Air Transat
Fri 29/512:40
LGW
-
YOW
1 stop24h 25m
Air Transat
Deal found 11/5£447
Mon 18/518:35
YOW
-
LGW
1 stop11h 10m
Porter Airlines
Tue 26/512:40
LGW
-
YOW
1 stop16h 45m
Porter Airlines
Deal found 11/5£447
Tue 26/516:00
YOW
-
LGW
1 stop13h 45m
Air Transat
Wed 3/609:40
LGW
-
YOW
1 stop19h 45m
Air Transat
Deal found 12/5£449
Fri 25/920:55
YOW
-
LGW
1 stop30h 00m
Porter Airlines
Tue 29/912:40
LGW
-
YOW
1 stop24h 25m
Porter Airlines
Deal found 12/5£450

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 14 May 2026.

Round-trip from

£441

One-way from

£189

Popular in

December

Cheapest in

February

Average price

£535

Good round-trip deal

£409 or less

Good one-way deal

£391 or less
Air Transat
  • Air Transat
  • 19/6-21/6
  • 1 total stop
  • 24h 00m total
  • Ottawa to London
Search Deals
2/6
  • 2/6
  • 2 total stops
  • 34h 55m 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 14 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 7/6

19:40-07:55

Nonstop7h 15m

London Gatwick

Tue 16/6

09:40-12:40

Nonstop8h 00m

£454

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Thu 27/8

16:00-10:45

1 stop13h 45m

London Gatwick

Sat 5/9

09:40-00:25

1 stop19h 45m

£470

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Tue 2/6

18:25-13:25

2 stops14h 00m

London Luton

Tue 16/6

09:40-17:35

2 stops12h 55m

£485

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Fri 19/6

06:55-17:25

3 stops29h 30m

London Luton

Tue 23/6

09:40-00:20

2 stops19h 40m

£489

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Thu 3/9

16:00-10:45

1 stop13h 45m

London Gatwick

Mon 7/9

09:40-00:25

1 stop19h 45m

£491

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Tue 26/5

18:25-22:50

2 stops23h 25m

London Luton

Thu 11/6

21:40-17:35

2 stops24h 55m

£492

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Mon 1/6

06:55-15:45

2 stops27h 50m

London Luton

Thu 18/6

21:40-17:35

2 stops24h 55m

£513

OttawaLondon

YOW - SEN

YOWSEN

Ottawa

Fri 5/6

11:15-10:45

2 stops18h 30m

London Southend

Sat 13/6

07:55-22:11

2 stops19h 16m

£520

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 7/6

17:25-09:25

1 stop11h 00m

London Gatwick

Sun 14/6

17:00-15:00

1 stop27h 00m

£521

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Sat 1/8

18:25-16:05

2 stops16h 40m

London Luton

Sun 9/8

09:00-17:35

2 stops13h 35m

£541

Flights are sorted by cheapest return flights first.

Deals found on 12/5

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 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

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.

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 £285). Flying from Ottawa to London in August is currently the most expensive (average of £472). 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 14 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?

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 143 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.

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 14 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
552 reviews
Check prices

Comfort

7.3

Crew

8.5

Food

6.8

Overall

7.8

Boarding

7.9

Entertainment

7.1

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
552 reviews
Air Transat
7.8
Good
552 reviews
Check prices

Comfort

7.3

Crew

8.5

Food

6.8

Overall

7.8

Boarding

7.9

Entertainment

7.1

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
11,034 reviews
Air Transat
7.8
Good
552 reviews
Check prices

Comfort

7.3

Crew

8.5

Food

6.8

Overall

7.8

Boarding

7.9

Entertainment

7.1

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 3 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 6h 35m. Air Transat provides one of the quickest options available for as low as £563. The distance between Ottawa and London is about 3320 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 £478. Air Canada is priced at 14% 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 City 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 United Airlines (57%), Aegean Airlines (54%) and Air Canada (54%).

  • 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 £285). Flying from Ottawa to London in August is currently the most expensive (average of £472). 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
Milton Keynes
Hounslow
Croydon
Wembley
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Romford
Watford
Kingston upon Thames
Eastbourne
Ipswich
Southend-on-Sea
Guildford
Southall
Chelmsford

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 14 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest£478Average£621FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers 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?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to London from Ottawa today with Cheapflights!

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

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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