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Cheap flights from Ottawa to London from £173

YOW — LON
21 Sep — 28 Sep1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Ottawa to London are usually found in September or February, booked 74 days in advance, depart on a Friday or Sunday 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

Tue 8/919:40 -
Nonstop7h 15m
Fri 25/909:40 -
Nonstop8h 00m
Deal found 19/8£346
Sun 13/919:40 -
Nonstop7h 15m
Tue 22/909:40 -
Nonstop8h 00m
Deal found 19/8£347
Sun 20/919:40 -
Nonstop7h 15m
Sun 27/909:40 -
Nonstop8h 00m
Deal found 21/8£348
Tue 15/919:40 -
Nonstop7h 15m
Tue 22/909:40 -
Nonstop8h 00m
Deal found 18/8£351
Tue 8/919:40 -
Nonstop7h 15m
Tue 22/912:40 -
1 stop12h 20m
Deal found 19/8£355
Sun 20/916:00 -
1 stop13h 45m
Tue 22/909:40 -
Nonstop8h 00m
Deal found 18/8£355
Tue 8/919:40 -
Nonstop7h 15m
Tue 15/909:40 -
Nonstop8h 00m
Deal found 18/8£358
Sun 20/919:30 -
2 stops16h 10m
Tue 22/912:10 -
2 stops40h 44m
Deal found 19/8£439
Tue 6/1015:10 -
2 stops17h 50m
Tue 13/1008:00 -
2 stops29h 15m
Deal found 22/8£453
Sat 3/1021:00 -
Nonstop6h 35m
Sat 10/1014:10 -
Nonstop7h 55m
Deal found 19/8£455
Wed 7/1017:30 -
1 stop22h 30m
Wed 14/1012:40 -
1 stop31h 05m
Deal found 22/8£456
Tue 8/916:00 -
2 stops17h 00m
Tue 22/908:00 -
2 stops18h 20m
Deal found 19/8£457

Find flight deals from Ottawa to London

Round-trip from

£346

One-way from

£173

Popular in

December

Cheapest in

September

Average price

£566

Good round-trip deal

£186 or less
Air Transat
  • Air Transat
  • 8/9-25/9
  • Nonstop
  • 15h 15m total
  • Ottawa to London
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Porter Airlines
  • Porter Airlines
  • 8/9
  • 1 total stop
  • 21h 05m total
  • Ottawa to London
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Highest demand for flights based on searches. 2% potential increase in price (£9 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
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Average for round-trip flights in August 2026
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Price to beat on a round-trip flight from Ottawa to London (LON).
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Cheapflights Fare Finder

 
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 Ottawa - LGW London Gatwick

YOWLGW

Ottawa

Thu 1/10

16:00-10:45

1 stop13h 45m

London Gatwick

Mon 12/10

09:40-20:00

1 stop15h 20m

£398

OttawaLondon

YOW Ottawa - LGW London Gatwick

YOWLGW

Ottawa

Sun 20/9

19:40-07:55

Nonstop7h 15m

London Gatwick

Wed 23/9

09:40-20:00

1 stop15h 20m

£411

OttawaLondon

YOW Ottawa - LTN London Luton

YOWLTN

Ottawa

Tue 6/10

15:10-14:00

2 stops17h 50m

London Luton

Tue 13/10

08:00-08:15

2 stops29h 15m

£453

OttawaLondon

YOW Ottawa - LTN London Luton

YOWLTN

Ottawa

Sat 5/12

12:30-20:50

3 stops27h 20m

London Luton

Thu 10/12

07:45-21:52

3 stops19h 07m

£468
Fastest return journey

OttawaLondon

YOW Ottawa - LHR London Heathrow

YOWLHR

Ottawa

Mon 14/9

18:55-06:30

Nonstop6h 35m

London Heathrow

Mon 21/9

09:30-12:25

Nonstop7h 55m

£473

OttawaLondon

YOW Ottawa - LTN London Luton

YOWLTN

Ottawa

Mon 14/9

07:00-15:50

2 stops27h 50m

London Luton

Mon 21/9

19:40-17:35

2 stops26h 55m

£498

OttawaLondon

YOW Ottawa - LHR London Heathrow

YOWLHR

Ottawa

Thu 10/9

15:10-10:40

2 stops14h 30m

London Heathrow

Mon 14/9

08:40-23:54

2 stops20h 14m

£503

OttawaLondon

YOW Ottawa - LHR London Heathrow

YOWLHR

Ottawa

Fri 2/10

17:20-11:55

1 stop13h 35m

London Heathrow

Fri 9/10

16:00-09:11

1 stop22h 11m

£512

OttawaLondon

YOW Ottawa - LTN London Luton

YOWLTN

Ottawa

Tue 13/10

11:15-14:00

2 stops21h 45m

London Luton

Sat 24/10

18:15-15:57

3 stops26h 42m

£513

OttawaLondon

YOW Ottawa - STN London Stansted

YOWSTN

Ottawa

Mon 5/10

11:15-20:50

2 stops28h 35m

London Stansted

Tue 13/10

06:35-19:45

2 stops18h 10m

£517

Flights are sorted by cheapest return flights first.

Deals found on 21/8

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

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, September is the cheapest month in which you can book a flight from Ottawa to London (average of £484). Flying from Ottawa to London in December is currently the most expensive (average of £691). 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?

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?

Airfare is below average for this route at the moment.
Ottawa to London flights typically cost between £439 and £594 in September.
The cheapest return price found within the last 5 days was £346 on Air Transat (8 Sept–25 Sept).

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

Toronto (YYZ) – chosen by Cheapflights users on 57% of one-stop itineraries from Ottawa to London on Cheapflights.

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

Toronto (YYZ) is the most affordable one-stop option, with an average return flight price of £469.

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

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?

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 128 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 Transat have had the lowest number of delays on this route, with just 20% 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 44 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Reviews of airlines servicing London

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
574 reviews
Check prices

Comfort

7.3

Crew

8.5

Boarding

8.0

Overall

7.8

Food

6.8

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Paul,Jul 2026

YUL - LGW

Had to bus to the plane which made priority boarding at the back of the bus
Air Transat
7.8
Good
574 reviews
Air Transat
7.8
Good
574 reviews
Check prices

Comfort

7.3

Crew

8.5

Boarding

8.0

Overall

7.8

Food

6.8

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Paul,Jul 2026

YUL - LGW

Had to bus to the plane which made priority boarding at the back of the bus
Air Canada
7.1
Good
11,519 reviews
Air Transat
7.8
Good
574 reviews
Check prices

Comfort

7.3

Crew

8.5

Boarding

8.0

Overall

7.8

Food

6.8

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Paul,Jul 2026

YUL - LGW

Had to bus to the plane which made priority boarding at the back of the bus

Related info for your journey

  • 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 0 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 £473. The distance between Ottawa and London is about 3320 mi. Most flights are nonstop.

  • 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 £473. Air Canada is priced at 11% 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 City, 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 Air Canada (47%), Aegean Airlines (47%) and Austrian Airlines (47%).

  • What are the cheapest flights from Ottawa to London?

    While on average a flight from Ottawa to London is generally £663, our data shows the cheapest flight currently is £649. When looking at the most popular route, (Ottawa - London Heathrow), you can expect to pay £467 for that flight.

  • 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, September is the cheapest month in which you can book a flight from Ottawa to London (average of £484). Flying from Ottawa to London in December is currently the most expensive (average of £691). 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?

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Top airline flying from Ottawa to London

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest£473Average£622FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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