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Cheap flights from Ottawa to London Heathrow Airport from £234

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 29/5. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LHR
29 Mar — 5 Apr1
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 81 days in advance, depart on a Monday or Friday 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 27 February 2026.

Sat 6/608:50
YOW
-
LHR
1 stop31h 10m
Multiple Airlines
Fri 12/614:05
LHR
-
YOW
1 stop11h 46m
Multiple Airlines
Deal found 22/2£416
Tue 2/616:00
YOW
-
LHR
1 stop14h 50m
Multiple Airlines
Wed 10/612:40
LHR
-
YOW
1 stop10h 53m
Multiple Airlines
Deal found 23/2£421
Sat 30/517:30
YOW
-
LHR
1 stop22h 30m
Multiple Airlines
Mon 8/609:30
LHR
-
YOW
Nonstop7h 55m
Multiple Airlines
Deal found 22/2£422
Tue 2/620:00
YOW
-
LHR
1 stop10h 50m
Multiple Airlines
Tue 9/612:40
LHR
-
YOW
2 stops13h 11m
Multiple Airlines
Deal found 23/2£424
Thu 14/517:30
YOW
-
LHR
1 stop22h 30m
Air Canada
Fri 5/612:40
LHR
-
YOW
1 stop10h 53m
Air Canada
Deal found 25/2£424
Mon 25/517:30
YOW
-
LHR
1 stop22h 30m
Multiple Airlines
Sun 7/614:05
LHR
-
YOW
1 stop11h 46m
Multiple Airlines
Deal found 24/2£427
Fri 15/509:05
YOW
-
LHR
1 stop16h 25m
Air Canada
Tue 2/609:30
LHR
-
YOW
1 stop17h 41m
Air Canada
Deal found 25/2£429
Fri 29/521:30
YOW
-
LHR
2 stops42h 30m
Air Canada
Sun 14/609:30
LHR
-
YOW
2 stops15h 21m
Air Canada
Deal found 24/2£430
Sat 30/508:50
YOW
-
LHR
1 stop31h 10m
Multiple Airlines
Sat 6/614:10
LHR
-
YOW
Nonstop7h 55m
Multiple Airlines
Deal found 25/2£430

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 27 February 2026.

Round-trip from

£421

One-way from

£234

Popular in

December

Cheapest in

November

Average price

£587
Air Canada
  • Air Canada
  • 2/6-10/6
  • 2 total stops
  • 25h 43m total
  • Ottawa to London
Search Deals
29/5
  • 29/5
  • 2 total stops
  • 22h 05m total
  • Ottawa to London
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£14 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 February 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 27 February 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

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 9/3

17:55-10:25

1 stop12h 30m

London Heathrow

Thu 12/3

11:05-16:30

2 stops33h 25m

£587

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 12/4

19:30-20:40

2 stops20h 10m

London Heathrow

Sun 19/4

10:25-16:38

1 stop11h 13m

£596

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Thu 9/4

06:00-06:45

3 stops19h 45m

London Heathrow

Thu 16/4

06:50-10:03

2 stops32h 13m

£602

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Wed 11/3

12:00-08:25

2 stops16h 25m

London Heathrow

Tue 31/3

07:45-21:35

2 stops18h 50m

£603

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 2/5

17:50-13:40

2 stops14h 50m

London Heathrow

Thu 7/5

08:45-19:11

2 stops15h 26m

£606

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 25/7

06:05-06:55

2 stops19h 50m

London Heathrow

Wed 5/8

07:25-23:54

2 stops21h 29m

£665

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 30/3

16:15-21:45

2 stops24h 30m

London Heathrow

Mon 6/4

06:00-19:35

2 stops18h 35m

£674

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 2/8

18:00-17:45

2 stops18h 45m

London Heathrow

Thu 13/8

11:20-01:35

2 stops19h 15m

£783

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Wed 15/7

06:55-06:45

2 stops18h 50m

London Heathrow

Mon 27/7

17:45-00:20

1 stop11h 35m

£993

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 13/4

09:00-12:55

3 stops22h 55m

London Heathrow

Mon 20/4

06:40-00:39

2 stops22h 59m

£1,181

Flights are sorted by cheapest return flights first.

Deals found on 24/2

Showing 1-10 of 19 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?

Use this chart to determine the optimal time to book a return flight from Ottawa to Heathrow. Price data was last updated on 20 February 2026.

Booking 81 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 £330). Flying from Ottawa to London Heathrow Airport in July is currently the most expensive (average of £497). 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 27 February 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.

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 27 February 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
10,748 reviews
Check prices

Boarding

7.3

Comfort

7.1

Crew

7.8

Food

6.3

Overall

7.1

Entertainment

6.8

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
10,748 reviews
Air Canada
7.1
Good
10,748 reviews
Check prices

Boarding

7.3

Comfort

7.1

Crew

7.8

Food

6.3

Overall

7.1

Entertainment

6.8

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 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 £587, United Airlines can have you in London Heathrow Airport from Ottawa in 12h 30m. 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 (£478), 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 (33%), Croatia Airlines (33%) or Air Canada (29%) 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 £330). Flying from Ottawa to London Heathrow Airport in July is currently the most expensive (average of £497). 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
Croydon
Wembley
Luton
Northampton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Watford
Guildford
Kingston upon Thames
Eastbourne
Ipswich
Chelmsford
Swindon
Bedford

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 27 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest£478Average£642FlexibilityNo 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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