How long is the flight from Ontario to London?

United Airlines, Delta, and Virgin Atlantic can get you from Ontario to London in just under 12h 16m. Your travel time can differ by up to 8h 09m. Airlines will cover a distance of 5407 mi. This flight may include one or multiple stops.

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

Flying on Virgin Atlantic is currently your cheapest option to London, with prices starting at $469. Additional round-trip tickets that might be worth considering are offered by Delta and KLM, with the lowest prices starting at $570 and $580, respectively. You may be able to fly from Ontario to London for 38% less than the average price by searching for these airlines.

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

What are the most popular routes from Ontario to London?

The most popular flight routes from Ontario to London are Ontario - London Heathrow, Ontario - London Gatwick and Ontario - London City.

What are the most popular airlines that fly from Ontario to London?

Before booking your flight from Ontario to London check out the most popular airlines for this route: United Airlines, British Airways or American Airlines.

Most accurate provider : When it comes to deals on Ontario-London flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-London flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ontario-London flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Ontario-London flights, Cheapflights users trust eDreams the most. eDreams 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 Ontario-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

Most people fly from Ontario (ONT) if they book a flight from Ontario to London. On average, Ontario has 0 outbound flights to London per day from 7 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

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

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

How can I find direct flights from Ontario to London?

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

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

Yes. Cheapflights offers flight deals from Ontario 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.

$389+ Flights from Ontario to London

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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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Cheap flight deals from Ontario to London

Cheapest flights from Ontario to London
Explore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

Sun 12/2811:59 pmONT - LHR

1 stop27h 16mUnited Airlines

Sun 1/116:00 pmLHR - ONT

2 stops34h 58mUnited Airlines

Deal found 12/13

$717

Sun 12/2811:59 pmONT - LHR

1 stop27h 16mUnited Airlines

Sat 1/103:10 pmLHR - ONT

3 stops28h 08mUnited Airlines

Deal found 12/13

$738

Tue 12/304:47 pmONT - LHR

1 stop12h 28mBritish Airways

Sat 2/710:35 amLHR - ONT

1 stop16h 10mBritish Airways

Deal found 12/15

$753

Sat 12/2711:59 pmONT - LHR

1 stop23h 56mUnited Airlines

Mon 1/126:00 pmLHR - ONT

2 stops34h 58mUnited Airlines

Deal found 12/13

$766

Sun 12/285:10 pmONT - LHR

1 stop32h 50mDelta

Mon 1/1210:45 amLHR - ONT

1 stop18h 20mDelta

Deal found 12/13

$783

Sat 12/2711:59 pmONT - LHR

1 stop23h 56mUnited Airlines

Sat 1/103:10 pmLHR - ONT

3 stops28h 08mUnited Airlines

Deal found 12/13

$787

Sat 12/276:39 pmONT - LHR

1 stop28h 46mUnited Airlines

Sun 1/1112:05 pmLHR - ONT

1 stop17h 53mUnited Airlines

Deal found 12/13

$788

Sun 12/285:10 pmONT - LHR

1 stop32h 50mDelta

Sat 1/103:05 pmLHR - ONT

1 stop15h 46mDelta

Deal found 12/13

$819

Wed 12/3110:47 amONT - LHR

1 stop13h 48mIberia

Mon 3/97:40 pmLHR - ONT

2 stops21h 26mIberia

Deal found 12/14

$886

Wed 12/3110:47 amONT - LHR

1 stop13h 48mIberia

Wed 3/47:40 pmLHR - ONT

2 stops35h 09mIberia

Deal found 12/14

$893

Sat 12/276:00 amONT - LHR

1 stop20h 00mDelta

Mon 1/128:55 amLHR - ONT

1 stop20h 10mDelta

Deal found 12/13

$920

Sat 12/2710:50 amONT - LGW

2 stops24h 05mIberia

Mon 1/127:40 pmLGW - ONT

2 stops35h 08mIberia

Deal found 12/13

$2,162

Best flights from Ontario to London
Discover carefully curated flight deals from Ontario to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 15, 2025.

Mon 1/261:24 pmONT - LHR

1 stop12h 16mUnited Airlines

Mon 2/27:40 amLHR - ONT

2 stops18h 03mUnited Airlines

Deal found 12/14

$629

Thu 3/57:30 amONT - LHR

1 stop19h 00mDelta

Thu 3/126:30 amLHR - ONT

2 stops21h 34mDelta

Deal found 12/13

$629

Mon 1/127:30 amONT - LHR

1 stop20h 25mVirgin Atlantic

Mon 1/198:25 pmLHR - ONT

2 stops27h 50mVirgin Atlantic

Deal found 12/15

$630

Wed 1/2810:58 amONT - LCY

2 stops19h 07mIberia

Wed 2/47:50 amLCY - ONT

2 stops22h 58mIberia

Deal found 12/14

$718

Wed 2/256:14 amONT - LGW

2 stops20h 41mMultiple Airlines

Wed 3/411:55 amLGW - ONT

2 stops18h 49mMultiple Airlines

Deal found 12/14

$928

Wed 2/256:00 amONT - LHR

2 stops18h 05mDelta

Wed 3/48:40 amLHR - ONT

2 stops20h 25mDelta

Deal found 12/14

$634

Fri 1/306:00 amONT - LHR

1 stop17h 25mUnited Airlines

Tue 2/36:30 amLHR - ONT

2 stops23h 29mUnited Airlines

Deal found 12/13

$640

Tue 3/31:15 pmONT - LHR

2 stops22h 55mDelta

Tue 3/106:30 amLHR - ONT

2 stops23h 03mDelta

Deal found 12/14

$634

Sat 1/101:53 pmONT - LHR

1 stop14h 07mUnited Airlines

Sat 1/1711:35 amLHR - ONT

1 stop17h 23mUnited Airlines

Deal found 12/13

$649

Thu 2/267:10 amONT - LCY

2 stops17h 40mIberia

Thu 3/57:50 amLCY - ONT

2 stops22h 59mIberia

Deal found 12/15

$718

Mon 1/2612:41 pmONT - LHR

1 stop14h 59mDelta

Tue 2/1012:30 pmLHR - ONT

1 stop16h 35mDelta

Deal found 12/13

$649

Wed 1/2110:58 amONT - LCY

2 stops19h 07mIberia

Wed 1/287:50 amLCY - ONT

2 stops22h 58mIberia

Deal found 12/15

$767

Wed 2/2510:59 amONT - LCY

2 stops19h 06mIberia

Wed 3/47:50 amLCY - ONT

2 stops22h 59mIberia

Deal found 12/14

$783

Wed 4/156:00 amONT - LGW

2 stops24h 40mMultiple Airlines

Tue 5/51:00 pmLGW - ONT

2 stops17h 38mMultiple Airlines

Deal found 12/13

$981

Thu 3/56:14 amONT - LGW

2 stops20h 41mMultiple Airlines

Thu 3/1211:55 amLGW - ONT

2 stops18h 37mMultiple Airlines

Deal found 12/14

$1,038

Thu 3/57:10 amONT - LCY

2 stops17h 40mIberia

Thu 3/127:50 amLCY - ONT

2 stops23h 09mIberia

Deal found 12/15

$882

Fri 1/96:00 amONT - LGW

2 stops20h 55mMultiple Airlines

Thu 1/2211:55 amLGW - ONT

2 stops20h 01mMultiple Airlines

Deal found 12/15

$1,051

Wed 3/410:59 amONT - LCY

2 stops19h 06mIberia

Wed 3/117:50 amLCY - ONT

2 stops21h 40mIberia

Deal found 12/15

$932

Mon 2/26:30 amONT - LGW

2 stops20h 25mMultiple Airlines

Mon 2/911:55 amLGW - ONT

2 stops20h 01mMultiple Airlines

Deal found 12/15

$1,061

Sun 1/119:45 amONT - LGW

2 stops17h 10mMultiple Airlines

Sun 1/1811:55 amLGW - ONT

2 stops20h 01mMultiple Airlines

Deal found 12/15

$1,063

Sun 5/175:05 pmONT - LCY

2 stops15h 35mDelta

Sun 5/311:45 pmLCY - ONT

2 stops17h 59mDelta

Deal found 12/13

$1,187

Tue 4/2111:30 amONT - LGW

2 stops19h 10mMultiple Airlines

Tue 5/51:00 pmLGW - ONT

2 stops16h 50mMultiple Airlines

Deal found 12/13

$1,064

Thu 2/266:14 amONT - LGW

2 stops20h 41mMultiple Airlines

Thu 3/511:55 amLGW - ONT

2 stops19h 37mMultiple Airlines

Deal found 12/15

$1,081

Mon 1/510:44 amONT - LGW

2 stops16h 11mMultiple Airlines

Tue 1/2011:55 amLGW - ONT

2 stops17h 50mMultiple Airlines

Deal found 12/13

$1,127

Mon 1/512:41 pmONT - LCY

2 stops19h 54mDelta

Tue 1/209:20 amLCY - ONT

2 stops19h 45mDelta

Deal found 12/13

$1,668

Last-minute flights from Ontario to London
Discover last-minute flight deals from Ontario to London. Data last updated December 15, 2025 and is based on user searches.

Fri 1/96:00 amONT - LGW

2 stops20h 55mMultiple Airlines

Thu 1/2211:55 amLGW - ONT

2 stops20h 01mMultiple Airlines

Deal found 12/15

$1,051

Sat 1/101:53 pmONT - LHR

1 stop14h 07mUnited Airlines

Sat 1/1711:35 amLHR - ONT

1 stop17h 23mUnited Airlines

Deal found 12/13

$649

Sun 1/119:45 amONT - LGW

2 stops17h 10mMultiple Airlines

Sun 1/1811:55 amLGW - ONT

2 stops20h 01mMultiple Airlines

Deal found 12/15

$1,063

Mon 1/127:30 amONT - LHR

1 stop20h 25mVirgin Atlantic

Mon 1/198:25 pmLHR - ONT

2 stops27h 50mVirgin Atlantic

Deal found 12/15

$630

Mon 1/1211:53 amONT - LGW

2 stops26h 37mMultiple Airlines

Mon 1/196:20 amLGW - ONT

2 stops25h 36mMultiple Airlines

Deal found 12/15

$1,043

Sun 1/1812:41 pmONT - LHR

1 stop14h 59mDelta

Sun 2/112:30 pmLHR - ONT

1 stop16h 35mDelta

Deal found 12/13

$650

Tue 1/205:05 amONT - LHR

2 stops22h 45mMultiple Airlines

Tue 1/279:30 amLHR - ONT

2 stops20h 28mMultiple Airlines

Deal found 12/14

$631

Tue 1/204:45 pmONT - LHR

1 stop12h 30mBritish Airways

Tue 1/273:00 pmLHR - ONT

1 stop15h 48mBritish Airways

Deal found 12/14

$642

Wed 1/217:16 amONT - LHR

1 stop17h 19mIberia

Wed 1/287:35 amLHR - ONT

2 stops23h 13mIberia

Deal found 12/15

$629

Wed 1/2110:58 amONT - LCY

2 stops19h 07mIberia

Wed 1/287:50 amLCY - ONT

2 stops22h 58mIberia

Deal found 12/15

$767

Wed 1/2810:58 amONT - LCY

2 stops19h 07mIberia

Wed 2/47:50 amLCY - ONT

2 stops22h 58mIberia

Deal found 12/14

$718

Fri 1/301:53 pmONT - LHR

1 stop14h 07mUnited Airlines

Tue 2/37:30 amLHR - ONT

2 stops22h 29mUnited Airlines

Deal found 12/12

$639

One-way flights from Ontario to London
Search for one-way flight options from Ontario to London. Find affordable one-way fares based on user searches. Data last updated December 15, 2025.

Wed 2/114:45 pmONT - LHR

1 stop12h 30mBritish Airways

Deal found 12/13

$389

Wed 1/144:45 pmONT - LHR

1 stop12h 30mBritish Airways

Deal found 12/15

$390

Mon 2/165:06 pmONT - LHR

1 stop12h 09mBritish Airways

Deal found 12/14

$394

Mon 1/126:39 pmONT - LHR

2 stops18h 41mUnited Airlines

Deal found 12/15

$399

Wed 12/315:05 amONT - LHR

2 stops18h 05mAir Canada

Deal found 12/15

$401

Mon 1/195:05 amONT - LHR

2 stops18h 05mAir Canada

Deal found 12/14

$402

Wed 12/316:04 amONT - LHR

1 stop17h 26mUnited Airlines

Deal found 12/15

$403

Tue 12/305:05 amONT - LHR

2 stops18h 05mAir Canada

Deal found 12/13

$406

Mon 12/295:05 amONT - LHR

2 stops41h 25mAir Canada

Deal found 12/13

$410

Sat 1/36:39 pmONT - LHR

1 stop33h 21mUnited Airlines

Deal found 12/14

$415

Tue 1/1310:58 amONT - LHR

1 stop15h 02mBritish Airways

Deal found 12/14

$421

Tue 1/276:00 amONT - LCY

2 stops46h 55mUnited Airlines

Deal found 12/14

$424

Find flight deals from Ontario to London

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$618 (Netflights)
One-way from	$389 (Cheapflightsfares)
Popular in	June
Cheapest in	February
Average price	$734

Provider with most accurate pricing for Ontario-London (LON) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Ontario-London (LON) flights.

Search Deals

From Ontario to London (LON)

Search Deals

One-way flight from Ontario to London (LON)

Search Deals

Highest demand for flights based on searches. 13% potential increase in price ($125 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 1/26

1:24 pm-9:40 am

1 stop12h 16m

London Heathrow

Mon 2/2

7:40 am-5:43 pm

2 stops18h 03m

$629

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 3/5

7:30 am-10:30 am

1 stop19h 00m

London Heathrow

Thu 3/12

6:30 am-9:04 pm

2 stops21h 34m

$629

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 1/12

7:30 am-11:55 am

1 stop20h 25m

London Heathrow

Mon 1/19

8:25 pm-4:15 pm

2 stops27h 50m

$630

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 2/25

6:00 am-8:05 am

2 stops18h 05m

London Heathrow

Wed 3/4

8:40 am-9:05 pm

2 stops20h 25m

$634

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 3/3

1:15 pm-8:10 pm

2 stops22h 55m

London Heathrow

Tue 3/10

6:30 am-10:33 pm

2 stops23h 03m

$634

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 1/30

6:00 am-7:25 am

1 stop17h 25m

London Heathrow

Tue 2/3

6:30 am-9:59 pm

2 stops23h 29m

$640

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 1/10

1:53 pm-12:00 pm

1 stop14h 07m

London Heathrow

Sat 1/17

11:35 am-8:58 pm

1 stop17h 23m

$649

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 1/26

12:41 pm-11:40 am

1 stop14h 59m

London Heathrow

Tue 2/10

12:30 pm-9:05 pm

1 stop16h 35m

$649

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Wed 1/28

10:58 am-2:05 pm

2 stops19h 07m

London City

Wed 2/4

7:50 am-10:48 pm

2 stops22h 58m

$718

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Thu 2/26

7:10 am-8:50 am

2 stops17h 40m

London City

Thu 3/5

7:50 am-10:49 pm

2 stops22h 59m

$718

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 51 results

...

Compare providers for flights from Ontario to London

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to London in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy2 stars	Trust Score*3 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 Ontario-London flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-London flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ontario-London flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Ontario-London flights, Cheapflights users trust eDreams the most. eDreams 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 Ontario-London 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 Ontario to London

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

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

Currently, October is the cheapest month in which you can book a flight from Ontario to London (average of $226). Flying from Ontario to London in June is currently the most expensive (average of $556). 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 ONT to LON?

It’s optimal to fly from Ontario to London in the afternoon. By choosing this option you can save up to 37% on the cost of your flight, compared to a flight at noon.

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

Travelers seeking maximum savings on their Ontario to London flight should consider departing on Tuesday mornings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing London

Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from Ontario to London by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

7.9

Good

8,008 reviews

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines

7.4

Good

9,092 reviews

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

American Airlines

7.2

Good

11,048 reviews

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Iberia

7.0

Good

3,052 reviews

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

British Airways

6.7

Okay

7,575 reviews

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What airport do you fly from for flights from Ontario to London?
Most people fly from Ontario (ONT) if they book a flight from Ontario to London. On average, Ontario has 0 outbound flights to London per day from 7 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.
How long is the flight from Ontario to London?
United Airlines, Delta, and Virgin Atlantic can get you from Ontario to London in just under 12h 16m. Your travel time can differ by up to 8h 09m. Airlines will cover a distance of 5407 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Ontario to London round-trip?
Flying on Virgin Atlantic is currently your cheapest option to London, with prices starting at $469. Additional round-trip tickets that might be worth considering are offered by Delta and KLM, with the lowest prices starting at $570 and $580, respectively. You may be able to fly from Ontario to London for 38% less than the average price by searching for these airlines.
What are the most popular routes from Ontario to London?
The most popular flight routes from Ontario to London are Ontario - London Heathrow, Ontario - London Gatwick and Ontario - London City.
Can I find deals for flights from Ontario to London that include hotel bookings?
Yes. In addition to deals on Ontario to London flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to London.
Can I find deals for business class flights from Ontario to London?
Yes. Cheapflights offers flight deals from Ontario 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 Ontario to London?
Currently, October is the cheapest month in which you can book a flight from Ontario to London (average of $226). Flying from Ontario to London in June is currently the most expensive (average of $556). 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

Ilford

Hounslow

Southend-on-Sea

Harrow

Eastleigh

Dartford

Dover

Winchester

Croydon

Orpington

Watford

Hayes

Borehamwood

Aylesbury

Chipping Norton

Horley

Kingston upon Thames

Wembley

Folkestone

Eastbourne

Browse thousands of different options on Cheapflights for your next trip

Top 7 airlines flying from Ontario to London

Airline	Cheapest	Average	Flexibility	On-time
Virgin Atlantic	Cheapest$469	Average$765	FlexibilityNo cancel fee	On-time72%
Delta	Cheapest$570	Average$672	FlexibilityNo cancel fee	On-timeN/A
KLM	Cheapest$580	Average$672	FlexibilityNo cancel fee	On-time75%
Iberia	Cheapest$615	Average$728	FlexibilityNo cancel fee	On-time77%
American Airlines	Cheapest$624	Average$778	FlexibilityNo cancel fee	On-time71%
British Airways	Cheapest$653	Average$862	FlexibilityNo cancel fee	On-time70%
United Airlines	Cheapest$665	Average$817	FlexibilityNo cancel fee	On-time69%

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$389+ Cheap flights from Ontario (ONT) to London (LON)

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 2/11. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to London with Cheapflights

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Cheap flight deals from Ontario to London

Cheapest flights from Ontario to LondonExplore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

Explore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

Find flight deals from Ontario to London

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to London that are best for you.

Compare providers for flights from Ontario to London

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 Ontario to London in December.

Best time to book a flight from Ontario to London

Have a flexible travel schedule? Discover the best time to fly to London from Ontario with our price prediction graph.

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Everything you need to know about your flight from Ontario to London

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

What is the cheapest time of day to fly from ONT to LON?

Find hourly flight availability from Ontario 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 December 15, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to London. Price data was last updated on December 16, 2024.

Reviews of airlines servicing London

Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from Ontario to London by reading reviews from past customers. Users have also rated airlines 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 Ontario 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 Ontario to London?

How long is the flight from Ontario to London?

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

What are the most popular routes from Ontario to London?

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

How can I find direct flights from Ontario to London?

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

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

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Alternative routes for Ontario to London

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Top 7 airlines flying from Ontario to London

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Cheapest flights from Ontario to London
Explore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.