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Cheap flights from Ottawa to London Heathrow Airport from £253

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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LHR
24 Aug — 31 Aug1
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 54 days in advance, depart on a Thursday or Wednesday 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 25 July 2026.

Mon 12/1016:00
YOW
-
LHR
2 stops34h 55m
Multiple Airlines
Thu 15/1006:00
LHR
-
YOW
2 stops21h 10m
Multiple Airlines
Deal found 21/7£394
Sun 6/908:50
YOW
-
LHR
1 stop31h 10m
Air Canada
Sun 13/909:30
LHR
-
YOW
1 stop9h 24m
Air Canada
Deal found 20/7£456
Wed 16/914:45
YOW
-
LHR
1 stop10h 45m
Air Canada
Wed 23/914:05
LHR
-
YOW
1 stop11h 39m
Air Canada
Deal found 23/7£459
Mon 7/918:55
YOW
-
LHR
Nonstop6h 35m
Air Canada
Wed 23/914:10
LHR
-
YOW
Nonstop7h 55m
Air Canada
Deal found 22/7£462
Mon 7/918:55
YOW
-
LHR
Nonstop6h 35m
Air Canada
Mon 14/909:30
LHR
-
YOW
Nonstop7h 55m
Air Canada
Deal found 23/7£465
Mon 21/918:55
YOW
-
LHR
Nonstop6h 35m
Multiple Airlines
Tue 29/908:45
LHR
-
YOW
2 stops15h 25m
Multiple Airlines
Deal found 22/7£468
Mon 12/1018:55
YOW
-
LHR
Nonstop6h 35m
Air Canada
Fri 16/1008:40
LHR
-
YOW
2 stops18h 30m
Air Canada
Deal found 21/7£469

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 25 July 2026.

Round-trip from

£394

One-way from

£253

Popular in

December

Cheapest in

November

Average price

£675
Air Canada
  • Air Canada
  • 12/10-15/10
  • 4 total stops
  • 56h 05m total
  • Ottawa to London
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6/9
  • 6/9
  • 3 total stops
  • 45h 05m total
  • Ottawa to London
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
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Average for round-trip flights in July 2026
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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 25 July 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

Wed 16/9

14:52-10:40

1 stop14h 48m

London Heathrow

Wed 23/9

08:40-23:54

2 stops20h 14m

£504

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Wed 30/9

06:00-06:45

3 stops19h 45m

London Heathrow

Wed 14/10

08:40-23:54

2 stops20h 14m

£504

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 26/9

06:05-06:55

2 stops19h 50m

London Heathrow

Sun 18/10

12:15-09:11

2 stops25h 56m

£518

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 5/9

17:57-09:20

1 stop10h 23m

London Heathrow

Sat 12/9

10:25-22:35

1 stop17h 10m

£518
Fastest return journey

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 7/9

17:10-10:45

2 stops12h 35m

London Heathrow

Wed 23/9

06:15-15:00

1 stop13h 45m

£541

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 18/10

06:25-06:45

1 stop19h 20m

London Heathrow

Fri 23/10

18:00-16:38

1 stop27h 38m

£541

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 11/10

19:30-10:40

1 stop10h 10m

London Heathrow

Sat 24/10

12:00-23:54

2 stops16h 54m

£542

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 2/11

15:10-06:20

1 stop10h 10m

London Heathrow

Sat 14/11

18:00-15:07

2 stops26h 07m

£566

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 1/11

06:00-10:50

2 stops47h 50m

London Heathrow

Sun 15/11

16:20-17:20

2 stops30h 00m

£572

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 18/8

14:00-13:00

2 stops18h 00m

London Heathrow

Tue 25/8

06:00-17:10

2 stops16h 10m

£612

Flights are sorted by cheapest return flights first.

Deals found on 19/7

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

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?

Booking 53 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 £516). Flying from Ottawa to London Heathrow Airport in December is currently the most expensive (average of £755). 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 25 July 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?

Airfare is below average for this route at the moment.

Ottawa to London Heathrow Airport flights typically cost between £620 and £710 in October.
The cheapest return price found within the last 5 days was £394 on Multiple Airlines (12 Oct–15 Oct).

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 25 July 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
11,382 reviews
Check prices

Crew

7.8

Comfort

7.1

Overall

7.1

Boarding

7.3

Entertainment

6.8

Food

6.3

Reviews

1 / 20
2.0
Mediocre

Lori,May 2026

YYZ - YFC

Didn't land, sent back to Toronto. No food, no accommodation, no help at all!!
Air Canada
7.1
Good
11,382 reviews
Air Canada
7.1
Good
11,382 reviews
Check prices

Crew

7.8

Comfort

7.1

Overall

7.1

Boarding

7.3

Entertainment

6.8

Food

6.3

Reviews

1 / 20
2.0
Mediocre

Lori,May 2026

YYZ - YFC

Didn't land, sent back to Toronto. No food, no accommodation, no help at all!!

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 are 3 flights 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 £504, United Airlines can have you in London Heathrow Airport from Ottawa in 14h 48m. Ottawa and London Heathrow Airport are separated by a distance of 3320 mi.

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

    According to our current data, Air Canada (£485), offers the cheapest pricing from Ottawa to London Heathrow Airport. You may be able to fly from Ottawa to London Heathrow Airport for 19% 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 Air Canada (67%), Aegean Airlines (67%) or Austrian Airlines (67%) as they are the most reliable in getting you off to your destination on time.

  • 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 £516). Flying from Ottawa to London Heathrow Airport in December is currently the most expensive (average of £755). 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
Hounslow
Milton Keynes
Luton
Wembley
Gatwick
Slough
Ilford
Hayes
Croydon
Colchester
Brentford
Eastbourne
Northampton
Watford
Swindon
Southend-on-Sea
Poole
Kingston upon Thames
Southall
Aylesbury

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 25 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest£485Average£648FlexibilityNo 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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