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Cheap flights from Ottawa to London Heathrow Airport from £249

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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LHR
12 Aug — 19 Aug1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Ottawa to London Heathrow are usually found in January or September, 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 13 July 2026.

Thu 1/1011:15
YOW
-
LHR
2 stops40h 00m
Multiple Airlines
Sun 4/1007:30
LHR
-
YOW
2 stops35h 24m
Multiple Airlines
Deal found 13/7£422
Tue 1/906:25
YOW
-
LHR
1 stop24h 30m
United Airlines
Thu 3/911:05
LHR
-
YOW
2 stops40h 30m
United Airlines
Deal found 10/7£433
Fri 4/917:30
YOW
-
LHR
1 stop22h 30m
Air Canada
Fri 11/912:40
LHR
-
YOW
1 stop11h 10m
Air Canada
Deal found 11/7£459
Sun 6/917:30
YOW
-
LHR
1 stop22h 30m
Air Canada
Sun 13/909:30
LHR
-
YOW
1 stop17h 40m
Air Canada
Deal found 13/7£460
Mon 7/918:55
YOW
-
LHR
Nonstop6h 35m
Air Canada
Wed 23/908:40
LHR
-
YOW
2 stops18h 30m
Air Canada
Deal found 9/7£464
Mon 28/918:55
YOW
-
LHR
Nonstop6h 35m
Multiple Airlines
Sat 10/1009:30
LHR
-
YOW
1 stop16h 20m
Multiple Airlines
Deal found 8/7£465
Fri 9/1017:30
YOW
-
LHR
1 stop22h 30m
Air Canada
Mon 19/1006:00
LHR
-
YOW
2 stops21h 10m
Air Canada
Deal found 8/7£466

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 13 July 2026.

Round-trip from

£433

One-way from

£249

Popular in

December

Cheapest in

January

Average price

£679
United Airlines
  • United Airlines
  • 1/9-3/9
  • 3 total stops
  • 65h 00m total
  • Ottawa to London
Search Deals
10/8
  • 10/8
  • 2 total stops
  • 28h 05m total
  • Ottawa to London
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (£4 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
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 13 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

Tue 15/9

10:25-07:15

2 stops15h 50m

London Heathrow

Tue 22/9

08:45-23:54

2 stops20h 09m

£500

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 1/9

06:05-06:55

2 stops19h 50m

London Heathrow

Sun 6/9

06:50-16:38

2 stops14h 48m

£505

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 1/9

15:10-10:25

1 stop14h 15m

London Heathrow

Sun 13/9

06:50-23:54

2 stops22h 04m

£506

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Thu 17/9

06:05-21:20

1 stop10h 15m

London Heathrow

Thu 29/10

18:00-14:29

2 stops24h 29m

£537

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Wed 30/9

18:01-09:20

1 stop10h 19m

London Heathrow

Sat 31/10

18:00-16:07

2 stops26h 07m

£537

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 20/11

06:00-21:20

1 stop10h 20m

London Heathrow

Wed 25/11

16:00-14:29

2 stops27h 29m

£561

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 9/8

06:05-07:15

1 stop20h 10m

London Heathrow

Sun 16/8

06:50-09:11

2 stops31h 21m

£568

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 1/8

06:00-05:55

2 stops18h 55m

London Heathrow

Thu 13/8

12:00-23:54

2 stops16h 54m

£578

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 13/9

12:00-06:55

2 stops13h 55m

London Heathrow

Fri 18/9

11:05-21:15

2 stops15h 10m

£603
Fastest return journey

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 20/11

06:00-21:20

1 stop10h 20m

London Heathrow

Sat 28/11

06:50-19:27

2 stops17h 37m

£607

Flights are sorted by cheapest return flights first.

Deals found on 8/7

Showing 1-10 of 21 resultsSorted by cheapest first
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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?

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, January is the cheapest month in which you can book a flight from Ottawa to London Heathrow Airport (average of £534). Flying from Ottawa to London Heathrow Airport in December is currently the most expensive (average of £752). 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 13 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?

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 13 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
11,332 reviews
Check prices

Boarding

7.3

Overall

7.1

Food

6.3

Comfort

7.1

Entertainment

6.8

Crew

7.8

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
11,332 reviews
Air Canada
7.1
Good
11,332 reviews
Check prices

Boarding

7.3

Overall

7.1

Food

6.3

Comfort

7.1

Entertainment

6.8

Crew

7.8

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 2 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 £500, United Airlines can have you in London Heathrow Airport from Ottawa in 15h 50m. 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 (£483), 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 United Airlines (80%), Air Canada (79%) or Aegean Airlines (79%) 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, January is the cheapest month in which you can book a flight from Ottawa to London Heathrow Airport (average of £534). Flying from Ottawa to London Heathrow Airport in December is currently the most expensive (average of £752). 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
Gatwick
Wembley
Slough
Ilford
Croydon
Hayes
Brentford
Colchester
Northampton
Watford
Eastbourne
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 13 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest£483Average£646FlexibilityNo 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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