How long is the flight from Ottawa to London?

A quick flight from Ottawa to London can take about 13h 40m. Air Transat provides one of the quickest options available for as low as £454. The distance between Ottawa and London is about 3340 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

Cheapflights users have booked flights from Ottawa to London round-trip from £444. Air Canada is priced at 19% lower than the current average price of a flight leaving 3 months from now.

What is the cheapest day to fly from Ottawa to London?

Travellers seeking maximum savings on their Ottawa to London flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What are the most popular routes from Ottawa to London?

While some choose either Ottawa - London Gatwick or Ottawa - London City, Ottawa - London Heathrow is the most popular route from Ottawa to London.

What are the cheapest flights from Ottawa to London?

While on average a flight from Ottawa to London is generally £652, our data shows the cheapest flight currently is £444. When looking at the most popular route, (Ottawa - London Heathrow), you can expect to pay £424 for that flight.

What are the most reliable airlines from Ottawa to London?

The top 3 most reliable airlines when flying from Ottawa to London are Air Canada (77%), Aegean Airlines (77%) and Austrian Airlines (77%).

What airport do you fly from for flights from Ottawa to London?

Most people fly from Ottawa (YOW) if they book a flight from Ottawa to London. On average, Ottawa has 3 outbound flights to London per day from 1 airline. Ottawa is conveniently located just 6.6 mi from Ottawa’s city center.

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 holiday 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.

£174+ Cheap Flights from Ottawa to London

Q: How much does it cost for a return flight from Ottawa to London?

Airfare is below average for this route at the moment. Ottawa to London flights typically cost between £526 and £609 in November. The cheapest return flight price found within the last 3 days was £452 on Air Transat (7 Nov-21 Nov).

Cheapflights Tip: The best prices from Ottawa to London are usually found in February or March, booked 54 days in advance, depart on a Monday or Friday and return on a Monday

Cheap flight deals from Ottawa to London

Round-trip from	£452
One-way from	£174
Popular in	December
Cheapest in	February
Average price	£561
Good round-trip deal	£638 or less

Air Transat
7/11-21/11
2 total stops
33h 46m total
Ottawa to London

Search Deals

19/10
2 total stops
25h 35m total
Ottawa to London

Search Deals

Highest demand for flights based on searches. 5% potential increase in price (£22 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

Price to beat on a round-trip flight from Ottawa to London (LON).

Search Deals

Find flight deals from Ottawa to London

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 18 September 2025.

Fri 7/1106:45YOW - LGW

1 stop22h 00mAir Transat

Fri 21/1111:40LGW - YOW

1 stop11h 46mAir Transat

Deal found 16/9£452

Mon 3/1112:15YOW - LHR

1 stop27h 20mMultiple Airlines

Mon 17/1109:00LHR - YOW

2 stops15h 18mMultiple Airlines

Deal found 16/9£452

Fri 17/1010:45YOW - LGW

1 stop19h 00mAir Transat

Thu 30/1011:40LGW - YOW

1 stop33h 11mAir Transat

Deal found 16/9£454

Wed 22/1007:00YOW - LHR

1 stop9h 00mAir Canada

Wed 29/1009:00LHR - YOW

2 stops28h 42mAir Canada

Deal found 16/9£454

Mon 29/907:00YOW - LHR

1 stop9h 00mAir Canada

Wed 8/1009:30LHR - YOW

1 stop9h 23mAir Canada

Deal found 16/9£456

Tue 23/907:00YOW - LHR

1 stop9h 00mAir Canada

Tue 30/909:30LHR - YOW

1 stop9h 21mAir Canada

Deal found 16/9£457

Sun 30/1105:40YOW - LHR

2 stops24h 10mMultiple Airlines

Sat 6/1212:15LHR - YOW

2 stops17h 27mMultiple Airlines

Deal found 17/9£458

Fri 21/1105:40YOW - LGW

1 stop23h 05mMultiple Airlines

Tue 25/1111:40LGW - YOW

1 stop18h 02mMultiple Airlines

Deal found 17/9£459

Mon 29/905:55YOW - LGW

2 stops22h 30mWestJet

Wed 8/1010:45LGW - YOW

2 stops18h 37mWestJet

Deal found 16/9£460

Sun 28/908:35YOW - LGW

1 stop21h 10mAir Transat

Tue 7/1012:40LGW - YOW

1 stop16h 41mAir Transat

Deal found 17/9£461

Wed 5/1115:05YOW - LGW

1 stop13h 40mAir Transat

Tue 11/1111:40LGW - YOW

1 stop18h 01mAir Transat

Deal found 16/9£462

Tue 4/1118:55YOW - LGW

1 stop9h 50mPorter Airlines

Tue 11/1111:40LGW - YOW

1 stop18h 01mPorter Airlines

Deal found 16/9£462

Best flights from Ottawa to London
Discover carefully curated flight deals from Ottawa to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 September 2025.

Thu 26/215:05YOW - LGW

1 stop13h 40mAir Transat

Mon 2/311:40LGW - YOW

1 stop25h 45mAir Transat

Deal found 16/9£454

Mon 29/907:00YOW - LGW

1 stop22h 45mPorter Airlines

Wed 29/1011:40LGW - YOW

1 stop24h 45mPorter Airlines

Deal found 17/9£476

Sat 4/1005:55YOW - LGW

2 stops22h 30mMultiple Airlines

Tue 14/1008:50LGW - YOW

3 stops38h 08mMultiple Airlines

Deal found 17/9£477

Mon 2/310:30YOW - LHR

2 stops15h 40mAir Canada

Fri 6/309:00LHR - YOW

1 stop10h 21mAir Canada

Deal found 16/9£502

Mon 3/1110:30YOW - LHR

1 stop15h 10mUnited Airlines

Wed 12/1116:20LHR - YOW

1 stop27h 10mUnited Airlines

Deal found 16/9£511

Thu 16/1018:55YOW - LHR

Nonstop6h 35mLufthansa

Thu 23/1014:05LHR - YOW

Nonstop7h 20mLufthansa

Deal found 16/9£526

Thu 26/216:15YOW - LCY

2 stops34h 40mSWISS

Mon 2/319:10LCY - YOW

2 stops28h 28mSWISS

Deal found 16/9£670

Tue 6/118:55YOW - LGW

1 stop9h 50mAir Transat

Tue 13/111:40LGW - YOW

1 stop11h 46mAir Transat

Deal found 17/9£464

Fri 17/1007:00YOW - LTN

2 stops33h 45mMultiple Airlines

Sun 2/1107:00LTN - YOW

3 stops46h 42mMultiple Airlines

Deal found 16/9£493

Mon 29/907:00YOW - LGW

1 stop22h 45mPorter Airlines

Fri 31/1011:40LGW - YOW

1 stop24h 45mPorter Airlines

Deal found 17/9£507

Sun 30/1106:45YOW - LGW

1 stop22h 00mAir Transat

Sun 7/1211:40LGW - YOW

1 stop11h 46mAir Transat

Deal found 17/9£464

Tue 30/906:33YOW - LHR

1 stop18h 47mUnited Airlines

Tue 28/1013:35LHR - YOW

1 stop24h 51mUnited Airlines

Deal found 17/9£513

Tue 30/914:20YOW - LGW

1 stop15h 25mPorter Airlines

Fri 31/1011:40LGW - YOW

1 stop24h 45mPorter Airlines

Deal found 17/9£507

Tue 14/1007:00YOW - STN

2 stops26h 20mMultiple Airlines

Tue 21/1022:05STN - YOW

3 stops27h 00mMultiple Airlines

Deal found 16/9£514

Sun 30/1106:45YOW - LGW

1 stop22h 00mAir Transat

Thu 4/1211:40LGW - YOW

1 stop11h 46mAir Transat

Deal found 17/9£467

Wed 22/1014:48YOW - LHR

2 stops14h 52mUnited Airlines

Wed 29/1008:00LHR - YOW

2 stops17h 18mUnited Airlines

Deal found 16/9£516

Sun 28/908:35YOW - LGW

1 stop21h 10mAir Transat

Sat 1/1111:40LGW - YOW

1 stop17h 01mAir Transat

Deal found 17/9£467

Mon 29/906:00YOW - LTN

2 stops22h 15mMultiple Airlines

Wed 8/1019:00LTN - YOW

3 stops27h 07mMultiple Airlines

Deal found 16/9£520

Fri 3/1019:29YOW - LHR

1 stop10h 11mUnited Airlines

Tue 14/1016:40LHR - YOW

1 stop22h 18mUnited Airlines

Deal found 15/9£537

Wed 5/1116:10YOW - LCY

2 stops15h 40mSWISS

Tue 11/1109:15LCY - YOW

2 stops14h 23mSWISS

Deal found 16/9£678

Sun 30/1106:45YOW - LGW

1 stop22h 00mAir Transat

Wed 10/1211:40LGW - YOW

1 stop11h 46mAir Transat

Deal found 17/9£467

Thu 20/1106:00YOW - LTN

2 stops34h 05mMultiple Airlines

Mon 24/1107:20LTN - YOW

2 stops22h 20mMultiple Airlines

Deal found 17/9£524

Mon 3/1110:30YOW - LHR

1 stop15h 10mUnited Airlines

Thu 20/1116:20LHR - YOW

1 stop27h 10mUnited Airlines

Deal found 16/9£537

Wed 5/1116:10YOW - LCY

2 stops15h 40mSWISS

Mon 10/1109:15LCY - YOW

2 stops15h 03mSWISS

Deal found 16/9£678

Sun 30/1106:45YOW - LGW

1 stop22h 00mAir Transat

Tue 9/1211:40LGW - YOW

1 stop11h 46mAir Transat

Deal found 17/9£467

Tue 4/1111:10YOW - LHR

1 stop13h 45mUnited Airlines

Sun 16/1110:25LHR - YOW

1 stop29h 01mUnited Airlines

Deal found 16/9£537

Sun 28/905:55YOW - STN

2 stops32h 35mMultiple Airlines

Tue 30/921:25STN - YOW

3 stops31h 56mMultiple Airlines

Deal found 16/9£545

Wed 5/1116:10YOW - LCY

2 stops19h 55mSWISS

Wed 12/1109:25LCY - YOW

2 stops14h 53mSWISS

Deal found 16/9£678

Mon 3/1110:30YOW - LHR

1 stop15h 10mUnited Airlines

Sun 9/1116:20LHR - YOW

1 stop27h 10mUnited Airlines

Deal found 16/9£537

Thu 2/1012:00YOW - LCY

2 stops15h 50mSWISS

Thu 16/1009:25LCY - YOW

2 stops14h 39mSWISS

Deal found 15/9£700

Direct flights from Ottawa to London
Explore direct flight options from Ottawa to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 18 September 2025.

Mon 29/918:55YOW - LHR

Nonstop6h 35mAir Canada

Wed 8/1012:40LHR - YOW

Nonstop7h 20mAir Canada

Deal found 16/9£456

Mon 29/918:55YOW - LHR

Nonstop6h 35mMultiple Airlines

Wed 8/1012:40LHR - YOW

Nonstop7h 20mMultiple Airlines

Deal found 16/9£460

Mon 29/918:55YOW - LHR

Nonstop6h 35mAir Canada

Wed 15/1012:40LHR - YOW

Nonstop7h 20mAir Canada

Deal found 15/9£473

Wed 15/1021:00YOW - LHR

Nonstop6h 35mAir Canada

Thu 23/1014:05LHR - YOW

Nonstop7h 20mAir Canada

Deal found 16/9£500

Mon 29/918:55YOW - LHR

Nonstop6h 35mAir Canada

Thu 16/1014:05LHR - YOW

Nonstop7h 20mAir Canada

Deal found 15/9£514

Sat 11/1021:00YOW - LHR

Nonstop6h 35mAir Canada

Thu 16/1014:05LHR - YOW

Nonstop7h 20mAir Canada

Deal found 16/9£526

Thu 16/1018:55YOW - LHR

Nonstop6h 35mAir Canada

Thu 23/1014:05LHR - YOW

Nonstop7h 20mAir Canada

Deal found 16/9£540

Mon 13/1018:55YOW - LHR

Nonstop6h 35mAir Canada

Mon 20/1014:05LHR - YOW

Nonstop7h 20mAir Canada

Deal found 16/9£547

Wed 1/1021:00YOW - LHR

Nonstop6h 35mLufthansa

Wed 15/1012:40LHR - YOW

Nonstop7h 20mLufthansa

Deal found 15/9£565

Last-minute flights from Ottawa to London
Discover last-minute flight deals from Ottawa to London. Data last updated 18 September 2025 and is based on user searches.

Tue 23/907:00YOW - LHR

1 stop9h 00mAir Canada

Tue 30/909:30LHR - YOW

1 stop9h 21mAir Canada

Deal found 16/9£457

Fri 26/916:25YOW - LGW

1 stop36h 35mMultiple Airlines

Wed 8/1010:45LGW - YOW

2 stops18h 37mMultiple Airlines

Deal found 16/9£529

Fri 26/916:25YOW - LGW

1 stop36h 35mMultiple Airlines

Mon 6/1014:00LGW - YOW

2 stops39h 22mMultiple Airlines

Deal found 16/9£530

Fri 26/916:25YOW - LGW

1 stop36h 35mMultiple Airlines

Tue 7/1014:00LGW - YOW

1 stop31h 57mMultiple Airlines

Deal found 16/9£537

Sun 28/908:35YOW - LGW

1 stop21h 10mAir Transat

Tue 7/1012:40LGW - YOW

1 stop16h 41mAir Transat

Deal found 17/9£461

Sun 28/908:35YOW - LGW

1 stop21h 10mAir Transat

Sat 1/1111:40LGW - YOW

1 stop17h 01mAir Transat

Deal found 17/9£467

Mon 29/907:00YOW - LHR

1 stop9h 00mAir Canada

Wed 8/1009:30LHR - YOW

1 stop9h 23mAir Canada

Deal found 16/9£456

Mon 29/918:55YOW - LHR

Nonstop6h 35mMultiple Airlines

Wed 8/1012:40LHR - YOW

Nonstop7h 20mMultiple Airlines

Deal found 16/9£461

Mon 29/906:00YOW - LTN

2 stops22h 15mMultiple Airlines

Wed 8/1019:00LTN - YOW

3 stops27h 07mMultiple Airlines

Deal found 16/9£520

Tue 14/1007:00YOW - STN

2 stops26h 20mMultiple Airlines

Tue 21/1022:05STN - YOW

3 stops27h 00mMultiple Airlines

Deal found 16/9£514

Fri 17/1007:00YOW - LTN

2 stops33h 45mMultiple Airlines

Sun 2/1107:00LTN - YOW

3 stops46h 42mMultiple Airlines

Deal found 16/9£493

Wed 22/1007:00YOW - LHR

1 stop9h 00mAir Canada

Wed 29/1009:00LHR - YOW

2 stops28h 42mAir Canada

Deal found 16/9£454

One-way flights from Ottawa to London
Search for one-way flight options from Ottawa to London. Find affordable one-way fares based on user searches. Data last updated 18 September 2025.

Sun 19/1014:20YOW - LGW

2 stops25h 35mMultiple Airlines

Deal found 16/9£174

Thu 16/1010:45YOW - STN

2 stops30h 40mMultiple Airlines

Deal found 16/9£174

Sun 19/1017:05YOW - LTN

2 stops17h 35mMultiple Airlines

Deal found 17/9£174

Sun 19/1017:05YOW - STN

2 stops19h 55mMultiple Airlines

Deal found 15/9£176

Fri 17/1017:05YOW - LTN

2 stops17h 40mMultiple Airlines

Deal found 17/9£176

Thu 16/1014:20YOW - LGW

2 stops26h 05mMultiple Airlines

Deal found 16/9£182

Fri 17/1017:05YOW - STN

2 stops19h 00mMultiple Airlines

Deal found 16/9£184

Fri 24/1007:00YOW - LTN

2 stops33h 45mMultiple Airlines

Deal found 17/9£185

Sat 25/1019:15YOW - LHR

1 stop37h 35mWestJet

Deal found 16/9£185

Sat 11/1017:05YOW - LGW

2 stops33h 50mMultiple Airlines

Deal found 16/9£186

Sat 11/1017:05YOW - STN

2 stops26h 15mMultiple Airlines

Deal found 16/9£186

Sat 11/1017:05YOW - LTN

2 stops34h 30mMultiple Airlines

Deal found 16/9£188

Fly from

Fly to

Route

Depart

Return

Price

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Thu 26/2

15:05-09:45

1 stop13h 40m

London Gatwick

Mon 2/3

11:40-08:25

1 stop25h 45m

£454

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Tue 6/1

18:55-09:45

1 stop9h 50m

London Gatwick

Tue 13/1

11:40-18:26

1 stop11h 46m

£464

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 30/11

06:45-09:45

1 stop22h 00m

London Gatwick

Sun 7/12

11:40-18:26

1 stop11h 46m

£464

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 30/11

06:45-09:45

1 stop22h 00m

London Gatwick

Thu 4/12

11:40-18:26

1 stop11h 46m

£467

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 28/9

08:35-10:45

1 stop21h 10m

London Gatwick

Sat 1/11

11:40-00:41

1 stop17h 01m

£467

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 30/11

06:45-09:45

1 stop22h 00m

London Gatwick

Wed 10/12

11:40-18:26

1 stop11h 46m

£467

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sun 30/11

06:45-09:45

1 stop22h 00m

London Gatwick

Tue 9/12

11:40-18:26

1 stop11h 46m

£467

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Mon 29/9

07:00-10:45

1 stop22h 45m

London Gatwick

Wed 29/10

11:40-08:25

1 stop24h 45m

£476

OttawaLondon

YOW - LGW

YOWLGW

Ottawa

Sat 4/10

05:55-09:25

2 stops22h 30m

London Gatwick

Tue 14/10

08:50-17:58

3 stops38h 08m

£477

OttawaLondon

YOW - LTN

YOWLTN

Ottawa

Fri 17/10

07:00-21:45

2 stops33h 45m

London Luton

Sun 2/11

07:00-00:42

3 stops46h 42m

£493

Flights are sorted by cheapest return flights first.

Deals found on 16/9

Showing 1-10 of 60 results

...

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 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

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

The price you pay for your flight from Ottawa to London may vary depending on when you book. For the best chance of a lower fare, look to book 54 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Ottawa to London?

Currently, January is the cheapest month in which you can book a flight from Ottawa to London (average of £112). Flying from Ottawa to London in August is currently the most expensive (average of £164). 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?

It’s typically best to fly out from Ottawa to London in the evening. Doing so could potentially save you 17% on the flight price compared to flying at midday, which is usually more expensive.

How much does it cost for a return flight from Ottawa to London?

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

Paris (CDG) – chosen by Cheapflights users on 44% of one-stop itineraries from Ottawa to London on Cheapflights.

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

Paris (CDG) is the most affordable one-stop option, with an average return flight price of £442.

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

Flights via Halifax (YHZ) have the shortest average one-way travel time for one-stop routes: 9h 10m.

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

Flights via Newark (EWR) offer the fastest connection on this route, with an average stopover time of 1h 23m.

Reviews of airlines servicing London

Check out reviews from past customers who have flown with Air Canada 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.

Air Canada

7.1

Good

10,000 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

janet,Sept 2025

YOW - YYZ

Really appreciated the leg room despite purchasing an economy ticket. Appreciated the extra complimentary wine. Nice touch. Was given immediate support without asking at check in, at the machine!! Ottawa's boarding was very organized with distinct rows in waiting room. Allowed for the main hall to not be blocked by people waiting to board.

Air Canada

7.1

Good

10,000 reviews

Air Canada

7.1

Good

10,000 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

janet,Sept 2025

YOW - YYZ

Related info for your journey

What airport do you fly from for flights from Ottawa to London?
Most people fly from Ottawa (YOW) if they book a flight from Ottawa to London. On average, Ottawa has 3 outbound flights to London per day from 1 airline. Ottawa is conveniently located just 6.6 mi from Ottawa’s city center.
How long is the flight from Ottawa to London?
A quick flight from Ottawa to London can take about 13h 40m. Air Transat provides one of the quickest options available for as low as £454. The distance between Ottawa and London is about 3340 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What is the cheapest airline to fly from Ottawa to London round-trip?
Cheapflights users have booked flights from Ottawa to London round-trip from £444. Air Canada is priced at 19% lower than the current average price of a flight leaving 3 months from now.
What are the most popular routes from Ottawa to London?
While some choose either Ottawa - London Gatwick or Ottawa - London City, Ottawa - London Heathrow is the most popular route from Ottawa to London.
What are the most reliable airlines from Ottawa to London?
The top 3 most reliable airlines when flying from Ottawa to London are Air Canada (77%), Aegean Airlines (77%) and Austrian Airlines (77%).
What are the cheapest flights from Ottawa to London?
While on average a flight from Ottawa to London is generally £652, our data shows the cheapest flight currently is £444. When looking at the most popular route, (Ottawa - London Heathrow), you can expect to pay £424 for that flight.
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 holiday 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, January is the cheapest month in which you can book a flight from Ottawa to London (average of £112). Flying from Ottawa to London in August is currently the most expensive (average of £164). 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

Milton Keynes

Croydon

Hounslow

Slough

Gatwick

Luton

Deal

Wembley

Ilford

Crawley

Hayes

Watford

Winchester

Chichester

Ipswich

Dartford

Guildford

Brentford

Bishop's Stortford

Romford

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Ottawa to London

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest£444	Average£604	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Fly with Cheapflights

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to London from Ottawa today with Cheapflights!

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

Cheapflights helps you find that perfect flight to London from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Yes, we can. To see specific flights from Ottawa to London with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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Not ready to book yet? You can track prices for flights from Ottawa to London on Cheapflights with our Price Alert feature and get notified when better prices are available.

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Cheap flights from Ottawa to London from £174

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 19/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Ottawa to London are usually found in February or March, booked 54 days in advance, depart on a Monday or Friday and return on a Monday

Cheap flight deals from Ottawa to London

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Find flight deals from Ottawa to London

Cheapest flights from Ottawa to LondonExplore 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 18 September 2025.

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 18 September 2025.

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Best time to book a flight from Ottawa to London

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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 return flight from Ottawa to London. Price data was last updated on 12 September 2025.

What is the cheapest month to book a flight from Ottawa to London?

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 18 September 2025.

How much does it cost for a return flight from Ottawa to London?

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

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

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

Average return fare for one-stop flights from Ottawa to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

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

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

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

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

Reviews of airlines servicing London

Check out reviews from past customers who have flown with Air Canada 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.

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.

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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 18 September 2025.