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Heathrow

$333+ Cheap flights from Ottawa (YOW) to Heathrow (LHR)

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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LHR
Apr 22 — Apr 291
Wed 4/22
Wed 4/29
1 adult, Economy
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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 Friday or Tuesday and return on a Thursday

Cheap flight deals from Ottawa to Heathrow

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 March 23, 2026.

This United Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/183:10 pm
YOW
-
LHR
2 stops14h 30m
United Airlines
Mon 6/18:40 am
LHR
-
YOW
2 stops20h 14m
United Airlines
Deal found 3/21$683
This United Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/256:25 am
YOW
-
LHR
1 stop21h 05m
United Airlines
Sun 6/77:25 am
LHR
-
YOW
2 stops21h 29m
United Airlines
Deal found 3/19$688
This United Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2410:25 am
YOW
-
LHR
2 stops15h 50m
United Airlines
Sat 5/306:50 am
LHR
-
YOW
2 stops14h 48m
United Airlines
Deal found 3/22$690
This Air Canada deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/157:30 pm
YOW
-
LHR
1 stop9h 30m
Air Canada
Mon 5/259:30 am
LHR
-
YOW
1 stop10h 18m
Air Canada
Deal found 3/19$691
This United Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/306:05 am
YOW
-
LHR
1 stop10h 20m
United Airlines
Sun 6/146:50 am
LHR
-
YOW
2 stops14h 48m
United Airlines
Deal found 3/22$694
This United Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1612:00 pm
YOW
-
LHR
2 stops14h 15m
United Airlines
Mon 6/110:50 am
LHR
-
YOW
2 stops16h 15m
United Airlines
Deal found 3/19$696
This United Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/212:00 pm
YOW
-
LHR
2 stops14h 15m
United Airlines
Mon 6/812:15 pm
LHR
-
YOW
2 stops14h 50m
United Airlines
Deal found 3/19$709
This Air Canada deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:55 pm
YOW
-
LHR
Nonstop6h 35m
Air Canada
Thu 9/249:30 am
LHR
-
YOW
Nonstop7h 55m
Air Canada
Deal found 3/22$712
This Air Canada deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:55 pm
YOW
-
LHR
Nonstop6h 35m
Air Canada
Thu 6/119:30 am
LHR
-
YOW
Nonstop7h 55m
Air Canada
Deal found 3/18$713
This Air Canada deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/99:00 pm
YOW
-
LHR
Nonstop6h 35m
Air Canada
Wed 9/302:10 pm
LHR
-
YOW
Nonstop7h 55m
Air Canada
Deal found 3/19$714
This Air Canada deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/133:10 pm
YOW
-
LHR
1 stop13h 50m
Air Canada
Sat 9/192:10 pm
LHR
-
YOW
Nonstop7h 55m
Air Canada
Deal found 3/23$715

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 March 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$683
(United Airlines)

One-way from

$333
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$776

Good round-trip deal

$758 or less
Provider with most accurate pricing for Ottawa-London Heathrow flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ottawa-London Heathrow flights.
Search Deals
From Ottawa to London Heathrow
Search Deals
One-way flight from Ottawa to London Heathrow
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT 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

 
Customize 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 2,558,603 searches. Data last updated March 23, 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 round-trip
Quickest round-trip

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 5/30

6:05 am-9:25 pm

1 stop10h 20m

London Heathrow

Sun 6/14

6:50 am-4:38 pm

2 stops14h 48m

$694

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 5/18

12:00 pm-8:20 am

2 stops15h 20m

London Heathrow

Wed 6/3

10:50 am-10:05 pm

2 stops16h 15m

$696

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 4/21

5:10 pm-10:45 am

2 stops12h 35m

London Heathrow

Tue 5/5

6:30 am-3:00 pm

2 stops13h 30m

$793

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 6/1

5:10 pm-10:45 am

2 stops12h 35m

London Heathrow

Thu 6/11

6:30 am-3:00 pm

2 stops13h 30m

$793

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 9/13

5:25 pm-10:45 am

2 stops12h 20m

London Heathrow

Sat 9/19

2:45 pm-12:20 am

2 stops14h 35m

$842

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 4/28

10:44 am-8:20 am

2 stops16h 36m

London Heathrow

Sat 5/9

6:50 am-4:38 pm

2 stops14h 48m

$903

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 9/6

5:10 pm-10:45 am

2 stops12h 35m

London Heathrow

Sun 9/13

6:15 am-3:00 pm

1 stop13h 45m

$961

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Wed 7/8

3:10 pm-7:15 am

1 stop11h 05m

London Heathrow

Thu 7/16

10:25 am-11:54 pm

2 stops18h 29m

$977

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 7/27

5:50 pm-10:25 am

1 stop11h 35m

London Heathrow

Thu 8/6

9:30 am-11:54 pm

2 stops19h 24m

$979

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sat 8/15

2:48 pm-7:15 am

1 stop11h 27m

London Heathrow

Sat 8/29

8:45 am-9:56 am

2 stops30h 11m

$982

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/18

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Ottawa to Heathrow

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ottawa to Heathrow in March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
oojoPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
Thrive TravelPrice Accuracy3 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ottawa-London Heathrow Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ottawa-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ottawa-London Heathrow Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ottawa-London Heathrow Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ottawa-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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 round-trip flight from Ottawa to Heathrow. Price data was last updated on March 13, 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 $447). Flying from Ottawa to London Heathrow Airport in July is currently the most expensive (average of $672). 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 March 23, 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 to fly round-trip 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 March 23, 2026.
See what other customers who have flown with Air Canada and Lufthansa from Ottawa to London Heathrow Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
10,835 reviews

Comfort

7.1

Food

6.3

Boarding

7.3

Overall

7.1

Crew

7.8

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
10,835 reviews
Air Canada
7.1
Good
10,835 reviews

Comfort

7.1

Food

6.3

Boarding

7.3

Overall

7.1

Crew

7.8

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.
Lufthansa
6.8
Okay
7,860 reviews
Air Canada
7.1
Good
10,835 reviews

Comfort

7.1

Food

6.3

Boarding

7.3

Overall

7.1

Crew

7.8

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?

    Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to London Heathrow. You should not have trouble finding flights to London Heathrow from Ottawa; the airport handles an average of 3 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 2 airlines have flights from the Ottawa airport to London Heathrow. It is only a 6.6 mi journey to Ottawa (YOW) from Ottawa’s city center.

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

    United Airlines and KLM can get you from Ottawa to London Heathrow Airport in just under 10h 20m. Your travel time can differ by up to 2h 15m. The distance between Ottawa and London Heathrow Airport is about 3320 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Ottawa to London Heathrow Airport round-trip?

    According to our current data, Lufthansa ($619), and Air Canada ($660) offers the cheapest pricing from Ottawa to London Heathrow Airport. You may be able to fly from Ottawa to London Heathrow Airport for 20% less than the average price by searching for these airlines.

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

    Consider Aegean Airlines (44%), Croatia Airlines (44%) or Air Canada (40%) when booking your flight. These represent the most reliable airlines when flying from Ottawa to London Heathrow Airport.

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

    The cheapest flight price from Ottawa to London Heathrow Airport is $701. On average you can expect to pay $872. The most popular route, (Ottawa - London Heathrow), can usually be booked for $668.

  • 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 vacation 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 $447). Flying from Ottawa to London Heathrow Airport in July is currently the most expensive (average of $672). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Ilford
Hounslow
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Orpington
Watford
Northampton
Borehamwood
Broadway
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Sutton

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ottawa to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
Pearson Intl to Heathrow flights
Pierre Elliott Trudeau Intl to Heathrow flights

Top 2 airlines flying from Ottawa to Heathrow

Discover the top 2 airlines 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 2,558,603 searches. Data last updated March 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$619Average$789FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$660Average$774FlexibilityNo cancel feeOn-time67%

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