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Cheap flights from Ontario to London from $285

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to London departing on 11/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:22 pm - 12:00 pmONT  Ontario-LHR London Heathrow
13h 38m1 stop Dallas/Fort Worth
Multiple Airlines Logo
2:45 pm - 10:54 pmLHR  London Heathrow-ONT Ontario
16h 09m1 stop Seattle/Tacoma Intl
$803Multiple Airlines
Tue, Nov 10 - Tue, Nov 17
Alaska Airlines Logo
6:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 11:04 pmLHR  London Heathrow-ONT Ontario
16h 19m1 stop Seattle/Tacoma Intl
$804Alaska Airlines
Sun, Nov 15 - Sun, Nov 22
Multiple Airlines Logo
12:42 pm - 10:00 amONT  Ontario-LHR London Heathrow
13h 18m1 stop Dallas/Fort Worth
Multiple Airlines Logo
2:45 pm - 10:54 pmLHR  London Heathrow-ONT Ontario
16h 09m1 stop Seattle/Tacoma Intl
$804Multiple Airlines
Sun, Nov 15 - Thu, Nov 19
Alaska Airlines Logo
12:00 pm - 12:20 pmONT  Ontario-LHR London Heathrow
16h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 10:39 pmLHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
$804Alaska Airlines
Tue, Jan 26 - Tue, Feb 9
British Airways Logo
3:09 pm - 12:15 pmONT  Ontario-LHR London Heathrow
13h 06m1 stop Dallas/Fort Worth
British Airways Logo
2:45 pm - 10:49 pmLHR  London Heathrow-ONT Ontario
16h 04m1 stop Dallas/Fort Worth
$841British Airways
Wed, Jan 6 - Thu, Jan 21
British Airways Logo
2:22 pm - 12:15 pmONT  Ontario-LHR London Heathrow
13h 53m1 stop Dallas/Fort Worth
British Airways Logo
2:45 pm - 10:45 pmLHR  London Heathrow-ONT Ontario
16h 00m1 stop Dallas/Fort Worth
$845British Airways
Wed, Jan 13 - Sat, Jan 16
Delta Logo
7:07 am - 7:45 amONT  Ontario-LHR London Heathrow
16h 38m2 stops Atlanta Hartsfield-Jackson Detroit Metropolitan Wayne County
Delta Logo
6:30 am - 5:13 pmLHR  London Heathrow-ONT Ontario
18h 43m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$871Delta
Wed, Nov 4 - Wed, Nov 18
Delta Logo
1:24 pm - 8:10 pmONT  Ontario-LHR London Heathrow
22h 46m2 stops Salt Lake City New York John F Kennedy Intl
Delta Logo
10:45 am - 4:30 pmLHR  London Heathrow-ONT Ontario
13h 45m1 stop Salt Lake City
$900Delta
Sat, Nov 7 - Wed, Nov 18
Virgin Atlantic Logo
12:18 pm - 1:15 pmONT  Ontario-LHR London Heathrow
16h 57m1 stop Atlanta Hartsfield-Jackson
Virgin Atlantic Logo
11:45 am - 10:43 pmLHR  London Heathrow-ONT Ontario
18h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$906Virgin Atlantic
Wed, Oct 7 - Wed, Oct 14
Virgin Atlantic Logo
7:00 am - 7:45 amONT  Ontario-LHR London Heathrow
16h 45m2 stops Atlanta Hartsfield-Jackson Detroit Metropolitan Wayne County
Virgin Atlantic Logo
12:40 pm - 11:48 pmLHR  London Heathrow-ONT Ontario
19h 08m2 stops Atlanta Hartsfield-Jackson Salt Lake City
$909Virgin Atlantic
Sun, Jan 10 - Wed, Jan 13

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Alaska Airlines flights from Ontario to London Heathrow Airport

Our best Alaska Airlines deals on Ontario to London Heathrow Airport flight tickets
Alaska Airlines
Nov 8
ONT6:00 amOntario
22h 20m
1 stop
LHR12:20 pmLondon Heathrow
Nov 13
LHR2:45 pmLondon Heathrow
16h 09m
1 stop
ONT10:54 pmOntario
$806
Alaska Airlines
Nov 7
ONT4:09 pmOntario
36h 11m
1 stop
LHR12:20 pmLondon Heathrow
Nov 15
LHR2:45 pmLondon Heathrow
16h 09m
1 stop
ONT10:54 pmOntario
$815
Alaska Airlines
Nov 7
ONT4:09 pmOntario
36h 11m
1 stop
LHR12:20 pmLondon Heathrow
Nov 17
LHR2:45 pmLondon Heathrow
35h 32m
1 stop
ONT6:17 pmOntario
$821

British Airways flights from Ontario to London Heathrow Airport

Our best British Airways deals on Ontario to London Heathrow Airport flight tickets
British Airways
Jan 6
ONT3:09 pmOntario
13h 06m
1 stop
LHR12:15 pmLondon Heathrow
Jan 21
LHR2:45 pmLondon Heathrow
16h 04m
1 stop
ONT10:49 pmOntario
$841
British Airways
Nov 11
ONT6:00 amOntario
16h 50m
1 stop
LHR6:50 amLondon Heathrow
Nov 22
LHR6:15 amLondon Heathrow
20h 42m
2 stops
ONT6:57 pmOntario
$848
British Airways
Nov 22
ONT12:42 pmOntario
13h 18m
1 stop
LHR10:00 amLondon Heathrow
Nov 30
LHR1:15 pmLondon Heathrow
13h 50m
1 stop
ONT7:05 pmOntario
$866

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to London Heathrow Airport 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, momondo users made 832,500 searches. Data last updated August 10, 2026.
Use the filters below to find and compare flights from Ontario to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 11/10

2:22 pm-12:00 pm

1 stop13h 38m

London Heathrow

Tue 11/17

2:45 pm-10:54 pm

1 stop16h 09m

$803

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 11/15

6:00 am-12:20 pm

1 stop22h 20m

London Heathrow

Sun 11/22

2:45 pm-11:04 pm

1 stop16h 19m

$804

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 11/15

12:42 pm-10:00 am

1 stop13h 18m

London Heathrow

Thu 11/19

2:45 pm-10:54 pm

1 stop16h 09m

$804

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 1/26

12:00 pm-12:20 pm

1 stop16h 20m

London Heathrow

Tue 2/9

2:45 pm-10:39 pm

1 stop15h 54m

$804
Quickest round-trip

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 1/6

3:09 pm-12:15 pm

1 stop13h 06m

London Heathrow

Thu 1/21

2:45 pm-10:49 pm

1 stop16h 04m

$841

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 1/13

2:22 pm-12:15 pm

1 stop13h 53m

London Heathrow

Sat 1/16

2:45 pm-10:45 pm

1 stop16h 00m

$845

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 11/4

7:07 am-7:45 am

2 stops16h 38m

London Heathrow

Wed 11/18

6:30 am-5:13 pm

2 stops18h 43m

$871

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sat 11/7

1:24 pm-8:10 pm

2 stops22h 46m

London Heathrow

Wed 11/18

10:45 am-4:30 pm

1 stop13h 45m

$900

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 10/7

12:18 pm-1:15 pm

1 stop16h 57m

London Heathrow

Wed 10/14

11:45 am-10:43 pm

2 stops18h 58m

$906

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 1/10

7:00 am-7:45 am

2 stops16h 45m

London Heathrow

Wed 1/13

12:40 pm-11:48 pm

2 stops19h 08m

$909

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Ontario to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Ontario and London Heathrow Airport?

Prices are currently low for flights on this route.

Typical prices usually range from $884 to $1,090.
The lowest price recently found on this route was $803.

What is the cheapest month to fly to London Heathrow Airport?

The month of February is, on average, the cheapest month to fly to London Heathrow Airport from Ontario, with most prices found around $621. If you’re not able to fly to London Heathrow Airport in February, then November is your next best option. Flight prices from Ontario to London Heathrow Airport during November average around $624.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $880. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,015.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is at noon. momondo users have found flights departing from Ontario to London Heathrow Airport at noon for as low as $707. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive with an average ticket price of $978.

When to book flights from Ontario to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to London Heathrow Airport (ONT to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to London Heathrow Airport

Fastest flight time

12h 22m

Direct flights

None
The fastest flight from Ontario to London Heathrow Airport takes 12h 22m
There are no direct flights from Ontario to London Heathrow Airport. There are no popular flight routes from Ontario to London Heathrow Airport.
Search flight deals

Frequently asked questions about flying from Ontario to London Heathrow Airport

  • How far is Ontario to London Heathrow by plane?

    The straight-line distance from Ontario to London Heathrow is 5408.1 mi. Typically, this will take 12h 22m by plane in normal conditions.

  • When did momondo last update prices for flights from Ontario Airport to London Heathrow Airport?

    Prices for flights from Ontario Airport to London Heathrow Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to London Heathrow Airport?

  • How old do you have to be to fly from Ontario Airport to London Heathrow Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to London Heathrow Airport?

Best airlines flying from Ontario to London Heathrow Airport

Compare and see reviews for airlines that fly from Ontario to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $329Free CancellationRating
6.7
8,154 reviews
Search British Airways flights
Virgin AtlanticPriceFrom $469Free CancellationRating
7.5
694 reviews
Search Virgin Atlantic flights
DeltaPriceFrom $535Free CancellationRating
7.8
8,505 reviews
Search Delta flights
American AirlinesPriceFrom $620Free CancellationRating
7.1
11,904 reviews
Search American Airlines flights
United AirlinesPriceFrom $665Free CancellationRating
7.4
10,101 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $806Free CancellationRating
7.9
12,795 reviews
Search Alaska Airlines flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Milton Keynes
Luton
Hayes
Stratford-upon-Avon
Wembley
Croydon
Dover
Stansted
Richmond
Kingston upon Thames
Harrow
Watford
Cobham
Slough
Uxbridge
Worthing
Romford
Ilford

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to London?

Finding the right flight to London from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

Can I find flights from Ontario to London with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to London.

I’m not ready to book a flight from Ontario to London right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to London from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your London Heathrow Airport trip

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