What is the cheapest airline that flies from Ontario to United Kingdom?

British Airways, United Airlines, and American Airlines are the most popular carriers operating from Ontario to United Kingdom

What airlines fly to United Kingdom?

British Airways, Virgin Atlantic and American Airlines are the top three most popular airlines that fly to United Kingdom from Ontario according to our data. British Airways is the first choice among our users, with 48% of people opting to fly with this airline when traveling to United Kingdom. Keep in mind that there are 24 different airlines that fly to United Kingdom on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Ontario Airport to United Kingdom?

Prices for flights from Ontario Airport to United Kingdom were last updated today.

How many operators does momondo search for flights from Ontario Airport to United Kingdom?

As of November 2026, there are 6 operators available to choose from for flights from Ontario Airport to United Kingdom.

How old do you have to be to fly from Ontario Airport to United Kingdom?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to United Kingdom.

What documentation or ID do you need to fly to United Kingdom?

The travel and health documents required for your trip to United Kingdom can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at United Kingdom. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$317 Cheap Flights from Ontario to the United Kingdom in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to the United Kingdom

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:45 pm - 10:15 amONT Ontario-LHR London Heathrow

36h 30m2 stops Denver Intl Houston George Bush Intcntl

9:00 am - 8:19 pmLHR London Heathrow-ONT Ontario

19h 19m2 stops Zurich San Francisco

$762United Airlines

Mon, Mar 1 - Thu, Mar 4

4:15 pm - 12:30 pmONT Ontario-BHX Birmingham

36h 15m2 stops San Francisco Frankfurt am Main

8:25 am - 10:15 pmBHX Birmingham-ONT Ontario

21h 50m2 stops Frankfurt am Main Chicago O'Hare Intl

$795United Airlines

Tue, Mar 2 - Fri, Mar 5

9:45 am - 11:50 amONT Ontario-LHR London Heathrow

18h 05m2 stops San Francisco Vancouver Intl

2:45 pm - 11:09 amLHR London Heathrow-ONT Ontario

28h 24m1 stop Seattle/Tacoma Intl

$808Multiple Airlines

Wed, Feb 3 - Mon, Feb 15

2:23 pm - 12:15 pmONT Ontario-LHR London Heathrow

13h 52m1 stop Dallas/Fort Worth

2:45 pm - 10:43 pmLHR London Heathrow-ONT Ontario

15h 58m1 stop Seattle/Tacoma Intl

$813Multiple Airlines

Tue, Feb 2 - Tue, Feb 9

6:00 am - 12:20 pmONT Ontario-LHR London Heathrow

22h 20m1 stop Seattle/Tacoma Intl

2:45 pm - 10:39 pmLHR London Heathrow-ONT Ontario

15h 54m1 stop Seattle/Tacoma Intl

$817Alaska Airlines

Mon, Feb 15 - Fri, Feb 19

6:00 am - 12:20 pmONT Ontario-LHR London Heathrow

22h 20m1 stop Seattle/Tacoma Intl

2:45 pm - 10:39 pmLHR London Heathrow-ONT Ontario

15h 54m1 stop Seattle/Tacoma Intl

$817Alaska Airlines

Mon, Feb 15 - Mon, Feb 22

7:00 am - 6:25 amONT Ontario-LHR London Heathrow

15h 25m1 stop Atlanta Hartsfield-Jackson

6:30 am - 10:43 pmLHR London Heathrow-ONT Ontario

24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$863Virgin Atlantic

Wed, Mar 3 - Wed, Mar 10

7:05 am - 6:25 amONT Ontario-LHR London Heathrow

15h 20m1 stop Atlanta Hartsfield-Jackson

8:25 pm - 10:34 pmLHR London Heathrow-ONT Ontario

34h 09m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$863Virgin Atlantic

Mon, Feb 1 - Mon, Feb 8

1:20 pm - 10:00 amONT Ontario-LHR London Heathrow

12h 40m1 stop Salt Lake City

6:20 am - 4:27 pmLHR London Heathrow-ONT Ontario

18h 07m2 stops Paris Charles de Gaulle Salt Lake City

$896Delta

Tue, Feb 2 - Tue, Feb 9

1:09 pm - 11:40 amONT Ontario-LHR London Heathrow

14h 31m1 stop Atlanta Hartsfield-Jackson

6:20 am - 4:27 pmLHR London Heathrow-ONT Ontario

18h 07m2 stops Paris Charles de Gaulle Salt Lake City

$946Delta

Thu, Feb 4 - Tue, Feb 9

Cheap last minute flights

Enter your travel dates to find the best prices.

12:01 pm - 6:30 pmONT Ontario-LHR London Heathrow

22h 29m2 stops San Francisco Kastrup Copenhagen

6:40 am - 7:30 pmLHR London Heathrow-ONT Ontario

20h 50m2 stops Kastrup Copenhagen San Francisco

$926Multiple Airlines

Fri, Nov 13 - Mon, Nov 16

7:05 am - 6:25 amONT Ontario-LHR London Heathrow

15h 20m1 stop Atlanta Hartsfield-Jackson

6:30 am - 11:00 pmLHR London Heathrow-ONT Ontario

24h 30m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$968Virgin Atlantic

Wed, Nov 11 - Wed, Nov 18

12:18 pm - 11:40 amONT Ontario-LHR London Heathrow

15h 22m1 stop Atlanta Hartsfield-Jackson

11:45 am - 11:00 pmLHR London Heathrow-ONT Ontario

43h 15m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$972Virgin Atlantic

Tue, Nov 10 - Tue, Nov 17

1:35 pm - 11:50 amONT Ontario-LHR London Heathrow

38h 15m2 stops San Francisco Vancouver Intl

2:30 pm - 12:29 pmLHR London Heathrow-ONT Ontario

29h 59m2 stops Vancouver Intl San Francisco

$976Air Canada

Tue, Nov 10 - Tue, Nov 17

12:18 pm - 1:45 pmONT Ontario-LHR London Heathrow

17h 27m2 stops Atlanta Hartsfield-Jackson Paris Charles de Gaulle

6:30 am - 5:15 pmLHR London Heathrow-ONT Ontario

18h 45m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$1,002Delta

Mon, Nov 9 - Thu, Dec 10

1:35 pm - 11:15 amONT Ontario-LHR London Heathrow

13h 40m1 stop San Francisco

1:45 pm - 8:15 pmLHR London Heathrow-ONT Ontario

14h 30m1 stop San Francisco

$1,028United Airlines

Tue, Nov 10 - Tue, Nov 17

1:29 pm - 9:40 amONT Ontario-LHR London Heathrow

12h 11m1 stop Denver Intl

1:45 pm - 8:15 pmLHR London Heathrow-ONT Ontario

14h 30m1 stop San Francisco

$1,028United Airlines

Wed, Nov 11 - Tue, Nov 17

12:02 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

2:45 pm - 10:59 pmLHR London Heathrow-ONT Ontario

16h 14m1 stop Seattle/Tacoma Intl

$1,028Alaska Airlines

Sun, Nov 8 - Thu, Dec 10

12:02 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

2:45 pm - 11:31 pmLHR London Heathrow-ONT Ontario

16h 46m1 stop Seattle/Tacoma Intl

$1,028Alaska Airlines

Tue, Nov 10 - Fri, Nov 20

7:05 am - 11:40 amONT Ontario-LHR London Heathrow

20h 35m1 stop Atlanta Hartsfield-Jackson

6:30 am - 9:57 pmLHR London Heathrow-ONT Ontario

23h 27m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

$1,049Delta

Mon, Nov 9 - Mon, Nov 16

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United Airlines flights from Ontario to United Kingdom

Our best United Airlines deals on Ontario to United Kingdom flight tickets

United Airlines

Mar 1

ONT1:45 pmOntario

36h 30m

2 stops

LHR10:15 amLondon Heathrow

Mar 4

LHR9:00 amLondon Heathrow

19h 19m

2 stops

ONT8:19 pmOntario

$762

United Airlines

Mar 2

ONT4:15 pmOntario

36h 15m

2 stops

BHX12:30 pmBirmingham

Mar 5

BHX6:00 amBirmingham

24h 59m

3 stops

ONT10:59 pmOntario

$795

United Airlines

Mar 1

ONT7:00 amOntario

14h 55m

1 stop

LHR5:55 amLondon Heathrow

Mar 4

LHR9:00 amLondon Heathrow

19h 19m

2 stops

ONT8:19 pmOntario

$887

Delta flights from Ontario to United Kingdom

Our best Delta deals on Ontario to United Kingdom flight tickets

Delta

Jan 9

ONT7:05 amOntario

42h 35m

2 stops

EDI9:40 amEdinburgh Turnhouse

Jan 21

EDI11:35 amEdinburgh Turnhouse

20h 22m

2 stops

ONT11:57 pmOntario

$993

Delta

Jan 10

ONT7:05 amOntario

18h 35m

2 stops

EDI9:40 amEdinburgh Turnhouse

Jan 22

EDI5:50 amEdinburgh Turnhouse

23h 53m

2 stops

ONT9:43 pmOntario

$996

Delta

Jan 11

ONT7:05 amOntario

43h 25m

2 stops

EDI10:30 amEdinburgh Turnhouse

Jan 22

EDI5:50 amEdinburgh Turnhouse

23h 53m

2 stops

ONT9:43 pmOntario

$998

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 3/1

1:45 pm-10:15 am

2 stops36h 30m

London Heathrow

Thu 3/4

9:00 am-8:19 pm

2 stops19h 19m

$762

OntarioBirmingham

ONT Ontario - BHX Birmingham

ONTBHX

Ontario

Tue 3/2

4:15 pm-12:30 pm

2 stops36h 15m

Birmingham

Fri 3/5

8:25 am-10:15 pm

2 stops21h 50m

$795

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 2/3

9:45 am-11:50 am

2 stops18h 05m

London Heathrow

Mon 2/15

2:45 pm-11:09 am

1 stop28h 24m

$808

Quickest round-trip

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 2/2

2:23 pm-12:15 pm

1 stop13h 52m

London Heathrow

Tue 2/9

2:45 pm-10:43 pm

1 stop15h 58m

$813

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 2/15

6:00 am-12:20 pm

1 stop22h 20m

London Heathrow

Fri 2/19

2:45 pm-10:39 pm

1 stop15h 54m

$817

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 2/15

6:00 am-12:20 pm

1 stop22h 20m

London Heathrow

Mon 2/22

2:45 pm-10:39 pm

1 stop15h 54m

$817

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 3/3

7:00 am-6:25 am

1 stop15h 25m

London Heathrow

Wed 3/10

6:30 am-10:43 pm

2 stops24h 13m

$863

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 2/1

7:05 am-6:25 am

1 stop15h 20m

London Heathrow

Mon 2/8

8:25 pm-10:34 pm

2 stops34h 09m

$863

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 2/2

1:20 pm-10:00 am

1 stop12h 40m

London Heathrow

Tue 2/9

6:20 am-4:27 pm

2 stops18h 07m

$896

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Thu 2/4

1:09 pm-11:40 am

1 stop14h 31m

London Heathrow

Tue 2/9

6:20 am-4:27 pm

2 stops18h 07m

$946

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Ontario to United Kingdom

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

Prices

Airlines

What is the cheapest month to fly to United Kingdom?

In general, December is the cheapest month to fly from Ontario to United Kingdom. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $798. If you aren’t able to travel to United Kingdom during the month of December, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $841.

Cheap Ontario to United Kingdom flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to United Kingdom

Best Price Found	$317
Fastest flight time	12h 40m
Direct flights	None

The best one-way flight to United Kingdom from Ontario in the past 72 hours is $317. The best round-trip flight deal from Ontario to United Kingdom found on momondo in the last 72 hours is $762.

The fastest flight from Ontario to United Kingdom takes 12h 40m

There are no direct flights from Ontario to United Kingdom. There are no popular flight routes from Ontario to United Kingdom.

Search flight deals

Frequently asked questions about flying from Ontario to the United Kingdom

When did momondo last update prices for flights from Ontario Airport to United Kingdom?
Prices for flights from Ontario Airport to United Kingdom were last updated today.
How many operators does momondo search for flights from Ontario Airport to United Kingdom?
As of November 2026, there are 6 operators available to choose from for flights from Ontario Airport to United Kingdom.
How old do you have to be to fly from Ontario Airport to United Kingdom?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to United Kingdom.
What documentation or ID do you need to fly to United Kingdom?
The travel and health documents required for your trip to United Kingdom can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at United Kingdom. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Ontario to United Kingdom

Compare and see reviews for airlines that fly from Ontario to United Kingdom with momondo

Airline	Rating	Free Cancellation	Price
Virgin Atlantic	PriceFrom $488	Free Cancellation	Rating 7.5 698 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom $615	Free Cancellation	Rating 6.7 8,285 reviews	Search British Airways flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.0 12,229 reviews	Search American Airlines flights
Delta	PriceFrom $710	Free Cancellation	Rating 7.8 8,698 reviews	Search Delta flights
Alaska Airlines	PriceFrom $806	Free Cancellation	Rating 7.9 13,156 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $809	Free Cancellation	Rating 7.3 10,469 reviews	Search United Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to United Kingdom for you.

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

momondo does allow users to show only those flights to United Kingdom from Ontario which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ontario to United Kingdom?

momondo provides multiple filters to help you find the best flight to United Kingdom from Ontario. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are not ready to book a flight from Ontario to United Kingdom now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to United Kingdom and let you know when they change.