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Cheap flights from Ottawa to London from C$ 351

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 16/6. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LON
18 Apr — 25 Apr1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Ottawa to London are usually found in February or January, booked 47 days in advance, depart on a Tuesday or Friday and return on a Sunday

Cheap flight deals from Ottawa to London

Enter your travel dates to find the best prices.

Cheapest flights from Ottawa to London
Explore the most affordable flight options available from Ottawa to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 March 2026.

Thu 21/55:30 p.m.
YOW
-
LHR
1 stop22h 30m
Air Canada
Sun 31/512:40 p.m.
LHR
-
YOW
1 stop31h 08m
Air Canada
Deal found 15/3C$ 887
Tue 5/56:55 a.m.
YOW
-
LGW
3 stops23h 10m
Multiple Airlines
Mon 11/59:30 p.m.
LGW
-
YOW
2 stops25h 05m
Multiple Airlines
Deal found 14/3C$ 894
Fri 15/53:00 p.m.
YOW
-
LHR
1 stop14h 00m
Air Canada
Fri 22/512:40 p.m.
LHR
-
YOW
1 stop11h 13m
Air Canada
Deal found 14/3C$ 894
Fri 29/53:00 p.m.
YOW
-
LHR
1 stop10h 30m
Air Canada
Sun 14/612:40 p.m.
LHR
-
YOW
2 stops13h 11m
Air Canada
Deal found 15/3C$ 895
Thu 14/56:35 p.m.
YOW
-
LGW
1 stop11h 10m
Air Transat
Wed 20/512:40 p.m.
LGW
-
YOW
1 stop16h 45m
Air Transat
Deal found 14/3C$ 898
Tue 2/67:30 p.m.
YOW
-
LHR
1 stop9h 30m
Air Canada
Tue 16/612:40 p.m.
LHR
-
YOW
1 stop11h 13m
Air Canada
Deal found 15/3C$ 899
Thu 21/54:00 p.m.
YOW
-
LGW
1 stop10h 55m
Air Transat
Sun 21/612:40 p.m.
LGW
-
YOW
1 stop24h 25m
Air Transat
Deal found 16/3C$ 900
Mon 6/43:05 p.m.
YOW
-
LGW
1 stop14h 40m
Air Transat
Mon 13/412:40 p.m.
LGW
-
YOW
1 stop24h 45m
Air Transat
Deal found 14/3C$ 902
Sat 23/58:50 a.m.
YOW
-
LHR
1 stop31h 10m
Air Canada
Mon 8/65:50 p.m.
LHR
-
YOW
2 stops26h 21m
Air Canada
Deal found 14/3C$ 905
Tue 26/56:55 a.m.
YOW
-
LTN
3 stops27h 35m
Multiple Airlines
Tue 9/69:40 a.m.
LTN
-
YOW
2 stops12h 55m
Multiple Airlines
Deal found 14/3C$ 909
Sat 16/55:30 p.m.
YOW
-
LHR
1 stop22h 30m
Multiple Airlines
Thu 21/59:30 a.m.
LHR
-
YOW
Nonstop7h 55m
Multiple Airlines
Deal found 14/3C$ 911
Wed 15/46:55 p.m.
YOW
-
LGW
1 stop10h 50m
Air Transat
Wed 22/412:40 p.m.
LGW
-
YOW
1 stop17h 01m
Air Transat
Deal found 16/3C$ 913

Find flight deals from Ottawa to London

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to London (LON). 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 19 March 2026.

Round-trip from

C$ 887

One-way from

C$ 351

Popular in

December

Cheapest in

February

Average price

C$ 968

Good round-trip deal

C$ 929 or less

Good one-way deal

C$ 66 or less
Air Canada
  • Air Canada
  • 21/5-31/5
  • 2 total stops
  • 53h 38m total
  • Ottawa to London
Search Deals
16/6
  • 16/6
  • 2 total stops
  • 23h 15m total
  • Ottawa to London
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 3 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 25 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 (LON).
Search Deals
Price to beat on a one-way flight from Ottawa to London (LON).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ottawa to London 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 629,999 searches. Data last updated 19 March 2026.
Use the filters below to find and compare flights from Ottawa to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sat 18/4

6:55 p.m.-10:45 a.m.

1 stop10h 50m

London Gatwick

Tue 21/4

12:40 p.m.-8:25 a.m.

1 stop24h 45m

C$ 940

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Wed 6/5

6:55 a.m.-12:35 p.m.

3 stops24h 40m

London Luton

Sun 10/5

7:30 p.m.-12:20 a.m.

3 stops33h 50m

C$ 950

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Sun 26/4

5:10 p.m.-4:35 p.m.

1 stop18h 25m

London Heathrow

Fri 8/5

6:15 a.m.-3:00 p.m.

1 stop13h 45m

C$ 954

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 7/9

5:45 p.m.-10:00 a.m.

1 stop11h 15m

London Heathrow

Sat 26/9

12:40 p.m.-6:40 p.m.

1 stop11h 00m

C$ 957

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Thu 18/6

7:00 a.m.-7:55 a.m.

1 stop19h 55m

London Gatwick

Fri 3/7

9:40 a.m.-12:40 p.m.

Nonstop8h 00m

C$ 961
Quickest round-trip

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 7/9

6:55 p.m.-6:30 a.m.

Nonstop6h 35m

London Heathrow

Sat 26/9

2:10 p.m.-5:05 p.m.

Nonstop7h 55m

C$ 963

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Thu 21/5

6:25 p.m.-12:25 p.m.

2 stops13h 00m

London Luton

Wed 27/5

6:15 a.m.-12:20 a.m.

2 stops23h 05m

C$ 963

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 24/5

6:35 p.m.-10:45 a.m.

1 stop11h 10m

London Gatwick

Thu 28/5

12:40 p.m.-12:25 a.m.

1 stop16h 45m

C$ 970

OttawaLondon

YOW - STN

YOWSTN

Ottawa

Sat 23/5

6:55 a.m.-10:15 a.m.

2 stops22h 20m

London Stansted

Mon 8/6

10:45 p.m.-12:20 a.m.

2 stops30h 35m

C$ 1,014

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Tue 2/6

6:25 p.m.-3:30 p.m.

2 stops16h 05m

London Luton

Tue 16/6

9:40 a.m.-5:35 p.m.

2 stops12h 55m

C$ 1,033

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/3

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Ottawa to London

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

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

Use this chart to determine the optimal time to book a round-trip flight from Ottawa to London. Price data was last updated on 13 March 2026.

Booking 47 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ottawa to London. 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?

Currently, December is the cheapest month in which you can book a flight from Ottawa to London (average of C$ 471). Flying from Ottawa to London in July is currently the most expensive (average of C$ 884). 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 LON?

Find hourly flight availability from Ottawa to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 19 March 2026.

When flying from Ottawa to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Ottawa to London?

What’s the top layover airport for flights from Ottawa to London?

Share of one-stop round-trip flights from Ottawa to London chosen by Cheapflights users in the past 12 months, using the same layover each way.

Toronto (YYZ) – chosen by Cheapflights users on 46% of one-stop itineraries from Ottawa to London on Cheapflights.

What’s the cheapest layover airport for flights from Ottawa to London?

Average round-trip fare for 1-stop flights from Ottawa to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Chicago (ORD) is the most affordable 1-stop option, with an average round-trip price of C$ 897.

What’s the fastest layover option from Ottawa to London?

Shortest average travel time for 1-stop one-way flights from Ottawa to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Halifax (YHZ) have the shortest average one-way travel time for 1-stop routes: 9h 00m.

Which airport typically offers the quickest layover for flights from Ottawa to London?

Average layover duration for 1-stop one-way flights from Ottawa to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Halifax (YHZ) offer the fastest connection on this route, with an average layover time of 1h 15m.

How often are flights from Ottawa to London delayed?

About 24% of weekly flights between Ottawa and London have experienced delays in the past year, with the average delay time being 134 minutes.

What is the most punctual flight time for Ottawa to London flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Monday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Ottawa to London flights?

Over the past year, Air Canada has had the lowest number of delays on this route, with just 24% of flights being delayed.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 19 March 2026.
Check out reviews from past customers who have flown with Porter Airlines,Air Transat, andUnited Airlines from Ottawa to London to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
424 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Porter Airlines
8.0
Very good
424 reviews
Porter Airlines
8.0
Very good
424 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Air Transat
7.7
Good
521 reviews
Porter Airlines
8.0
Very good
424 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
United Airlines
7.4
Good
9,443 reviews
Porter Airlines
8.0
Very good
424 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Air Canada
7.1
Good
10,816 reviews
Porter Airlines
8.0
Very good
424 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Lufthansa
6.8
Okay
7,857 reviews
Porter Airlines
8.0
Very good
424 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.

Related info for your journey

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

    Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to London. You should not have trouble finding flights to London from Ottawa; the airport handles an average of 2 outbound flights to London per day. You should also have plenty of airline options to choose from since 6 airlines have flights from the Ottawa airport to London. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

  • How long is the flight from Ottawa to London?

    Departing from Ottawa to London will take you 6h 35m. The distance between Ottawa and London is about 5343 km. Both multi-stop and direct flights can be found to your destination and back.

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

    Our cheapest airline available from Ottawa to London is Air Transat. Our recent data shows that you can find tickets from as low as C$ 619 on this airline. Additional options worth looking into are Air France and Porter Airlines, starting at C$ 773 and C$ 779 round-trip. You may be able to fly from Ottawa to London for 38% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Ottawa to London one-way?

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at C$ 338. Air Canada flights start at C$ 472 while deals on Lufthansa start at C$ 545 one-way.

  • What are the most popular routes from Ottawa to London?

    Most travellers choose Ottawa - London Heathrow, Ottawa - London City or Ottawa - London Stansted when deciding on the best route from Ottawa to London.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Ottawa to London on time: Aegean Airlines (44%), Croatia Airlines (44%), Air Canada (40%).

  • What are the cheapest flights from Ottawa to London?

    The cheapest flight price from Ottawa to London is C$ 705. On average you can expect to pay C$ 1,597. The most popular route, (Ottawa - London Heathrow), can usually be booked for C$ 907.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ottawa to London 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?

    Currently, December is the cheapest month in which you can book a flight from Ottawa to London (average of C$ 471). Flying from Ottawa to London in July is currently the most expensive (average of C$ 884). 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?

Book flights to London if you plan to visit one of these locations
Twickenham
Sutton
Gatwick
Slough
Marlow
Cobham
Romford
Watford
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Luton
High Wycombe
Hounslow

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Fly from Ottawa to London on these airlines

Choose from the following airlines for your flight from Ottawa to London. Flights are based on user searches made on Cheapflights and were last updated on 19 March 2026.
Air Canada flights from Ottawa to London
Air Transat flights from Ottawa to London
Lufthansa flights from Ottawa to London

Top 6 airlines flying from Ottawa to London

Discover the top 6 airlines that operate flights from Ottawa to London. 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 629,999 searches. Data last updated 19 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Air TransatCheapestC$ 619AverageC$ 891FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Air FranceCheapestC$ 773AverageC$ 1,022FlexibilityNo cancel feeOn-time77%
Search Air France flights
Porter AirlinesCheapestC$ 779AverageC$ 1,246FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 883AverageC$ 1,100FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 893AverageC$ 1,051FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapestC$ 932AverageC$ 1,075FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ottawa to London?

Cheapflights helps you search for flights from Ottawa to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

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

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

Need flexible booking options for your flight to London from Ottawa? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes! Start tracking prices for Ottawa to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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