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Cheap flights from Ottawa to London Heathrow Airport from £254

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 27/5. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LHR
30 Apr — 7 May1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Ottawa to London Heathrow are usually found in November or January, booked 45 days in advance, depart on a Monday or Tuesday and return on a Friday

Cheap flight deals from Ottawa to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Ottawa to Heathrow
Explore the most affordable flight options available from Ottawa to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 March 2026.

Sat 30/506:05
YOW
-
LHR
1 stop10h 20m
Air Canada
Sat 6/612:40
LHR
-
YOW
1 stop11h 13m
Air Canada
Deal found 30/3£509
Mon 25/506:05
YOW
-
LHR
2 stops19h 50m
United Airlines
Thu 4/608:45
LHR
-
YOW
2 stops20h 09m
United Airlines
Deal found 30/3£511
Sat 23/510:44
YOW
-
LHR
2 stops17h 36m
United Airlines
Thu 4/608:45
LHR
-
YOW
2 stops20h 09m
United Airlines
Deal found 30/3£512
Wed 27/510:25
YOW
-
LHR
2 stops14h 30m
United Airlines
Mon 8/608:40
LHR
-
YOW
2 stops20h 14m
United Airlines
Deal found 28/3£513
Wed 27/520:05
YOW
-
LHR
1 stop10h 45m
Austrian Airlines
Wed 3/606:00
LHR
-
YOW
2 stops16h 11m
Austrian Airlines
Deal found 29/3£514
Mon 25/506:05
YOW
-
LHR
2 stops19h 50m
United Airlines
Mon 1/608:40
LHR
-
YOW
2 stops20h 14m
United Airlines
Deal found 26/3£515
Sat 23/506:05
YOW
-
LHR
2 stops19h 50m
United Airlines
Fri 29/507:25
LHR
-
YOW
2 stops16h 23m
United Airlines
Deal found 27/3£516
Sun 24/510:25
YOW
-
LHR
2 stops15h 50m
United Airlines
Wed 3/606:50
LHR
-
YOW
2 stops14h 48m
United Airlines
Deal found 30/3£517
Mon 1/619:30
YOW
-
LHR
1 stop10h 10m
United Airlines
Sun 14/607:25
LHR
-
YOW
2 stops31h 38m
United Airlines
Deal found 27/3£517
Sun 24/510:44
YOW
-
LHR
2 stops15h 11m
United Airlines
Sat 30/506:50
LHR
-
YOW
2 stops14h 48m
United Airlines
Deal found 27/3£518
Thu 14/519:30
YOW
-
LHR
2 stops20h 10m
United Airlines
Wed 20/506:50
LHR
-
YOW
2 stops14h 48m
United Airlines
Deal found 27/3£519
Sat 23/515:10
YOW
-
LHR
1 stop13h 10m
United Airlines
Sat 30/506:50
LHR
-
YOW
2 stops16h 58m
United Airlines
Deal found 26/3£520

Find flight deals from Ottawa to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to Heathrow (LHR). 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 31 March 2026.

Round-trip from

£509

One-way from

£254

Popular in

December

Cheapest in

November

Average price

£587

Good round-trip deal

£587 or less
Air Canada
  • Air Canada
  • 30/5-6/6
  • 2 total stops
  • 21h 33m total
  • Ottawa to London
Search Deals
27/5
  • 27/5
  • 3 total stops
  • 20h 00m total
  • Ottawa to London
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£13 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Ottawa to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Ottawa to Heathrow 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 31 March 2026.
Use the filters below to find and compare flights from Ottawa to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 5/6

17:10-10:45

2 stops12h 35m

London Heathrow

Wed 17/6

14:45-00:20

2 stops14h 35m

£591

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 22/5

12:00-07:15

2 stops14h 15m

London Heathrow

Thu 18/6

06:50-16:38

2 stops14h 48m

£639
Fastest return journey

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Wed 29/4

18:25-11:10

1 stop11h 45m

London Heathrow

Sun 10/5

06:15-15:00

1 stop13h 45m

£639

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Wed 6/5

10:44-05:55

2 stops14h 11m

London Heathrow

Wed 20/5

06:50-16:38

2 stops14h 48m

£661

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 15/5

06:05-21:25

1 stop10h 20m

London Heathrow

Fri 22/5

09:00-10:03

2 stops30h 03m

£661

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 18/4

06:00-08:30

3 stops21h 30m

London Heathrow

Wed 29/4

10:50-22:05

2 stops16h 15m

£665

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 9/6

06:55-07:15

2 stops19h 20m

London Heathrow

Sun 14/6

17:45-00:20

1 stop11h 35m

£706

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 22/5

06:55-07:10

2 stops19h 15m

London Heathrow

Fri 29/5

17:45-17:35

1 stop28h 50m

£711

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 2/5

06:55-12:05

2 stops24h 10m

London Heathrow

Tue 26/5

17:45-00:20

1 stop11h 35m

£717

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 24/5

17:50-17:45

2 stops18h 55m

London Heathrow

Fri 5/6

13:45-09:41

2 stops24h 56m

£792

Flights are sorted by cheapest return flights first.

Deals found on 26/3

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Ottawa to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow 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 Heathrow Airport

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

Use this chart to determine the optimal time to book a return flight from Ottawa to Heathrow. Price data was last updated on 13 March 2026.

Booking 45 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ottawa to London Heathrow Airport. 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 Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Ottawa to London Heathrow Airport (average of £338). Flying from Ottawa to London Heathrow Airport in July is currently the most expensive (average of £508). 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 LHR?

Find hourly flight availability from Ottawa to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 31 March 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 Heathrow Airport as you normally would.

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

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated 31 March 2026.
Read reviews from past customers who have flown with Air Canada from Ottawa to London Heathrow Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
10,866 reviews
Check prices

Entertainment

6.8

Food

6.3

Overall

7.1

Boarding

7.3

Comfort

7.1

Crew

7.8

Reviews

1 / 20
4.0
Okay

Sugith,Jan 2026

YSB - YYZ

Left 2 hours late. Stuck on plane for an hour after boarding before take off.
Air Canada
7.1
Good
10,866 reviews
Air Canada
7.1
Good
10,866 reviews
Check prices

Entertainment

6.8

Food

6.3

Overall

7.1

Boarding

7.3

Comfort

7.1

Crew

7.8

Reviews

1 / 20
4.0
Okay

Sugith,Jan 2026

YSB - YYZ

Left 2 hours late. Stuck on plane for an hour after boarding before take off.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Heathrow. 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 Heathrow?

    If you book a flight to London Heathrow from Ottawa, you will be flying from Ottawa, which is the city’s only airport. Ottawa (YOW) is located 6.6 mi from the center of Ottawa. There is 1 flight from Ottawa to London Heathrow per day from 1 airline.

  • How long is the flight from Ottawa to London Heathrow Airport?

    For as low as £639, KLM can have you in London Heathrow Airport from Ottawa in 11h 45m. Ottawa and London Heathrow Airport are separated by a distance of 3320 mi. This flight may include one or multiple stops.

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

    According to our current data, Air Canada (£489), offers the cheapest pricing from Ottawa to London Heathrow Airport. You may be able to fly from Ottawa to London Heathrow Airport for 16% less than the average price by searching for this airline.

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

    No one likes to see their flight delayed. When booking a flight from Ottawa to London Heathrow Airport consider choosing Aegean Airlines (44%), Croatia Airlines (44%) or Air Canada (40%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Ottawa to London Heathrow Airport?

    Looking for the cheapest flight from Ottawa to London Heathrow Airport? While on average our users pay £587, our data indicates the cheapest price to be £530. The most popular route (Ottawa - London Heathrow), is priced around £479.

  • Can I find deals for flights from Ottawa to Heathrow that include hotel bookings?

    Yes. In addition to deals on Ottawa to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Heathrow.

  • Can I find deals for business class flights from Ottawa to Heathrow?

    Yes. Cheapflights offers flight deals from Ottawa to Heathrow 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 Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Ottawa to London Heathrow Airport (average of £338). Flying from Ottawa to London Heathrow Airport in July is currently the most expensive (average of £508). 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 Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Wembley
Croydon
Northampton
Hounslow
Gatwick
Slough
Ilford
Luton
Hayes
Brentford
Colchester
Guildford
Watford
Kingston upon Thames
Romford
Eastbourne
Swindon
Bedford
Chelmsford

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.

Top airline flying from Ottawa to Heathrow

Discover the top airline that operate flights from Ottawa to Heathrow. 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 31 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest£489Average£623FlexibilityNo 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 Heathrow?

When you search for this flight from Ottawa to Heathrow, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ottawa to Heathrow for you. Better yet — we are completely free to use.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ottawa to Heathrow flexibly with Cheapflights today.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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