What is the cheapest airline that flies from London to Ontario?

Alaska Airlines, American Airlines, and Iberia are the most popular carriers operating from London to Ontario

What airlines fly to Ontario?

British Airways, Virgin Atlantic and United Airlines are the top three most popular airlines that fly to Ontario from London according to our data. British Airways is the first choice among our users, with 52% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 12 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

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

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

As of September 2026, there is 1 operator available to choose from for flights from London to Ontario Airport.

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

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 London to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$445 Cheap Flights from London to Ontario in 2026/27

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9:00 am - 8:15 pmLHR London Heathrow-ONT Ontario

19h 15m2 stops Zurich San Francisco

6:00 am - 7:40 amONT Ontario-LHR London Heathrow

17h 40m1 stop Houston George Bush Intcntl

$511United Airlines

Wed, Nov 11 - Wed, Nov 18

7:25 am - 8:31 pmLHR London Heathrow-ONT Ontario

21h 06m2 stops Munich Franz Josef Strauss San Francisco

5:00 am - 7:15 amONT Ontario-LHR London Heathrow

18h 15m2 stops Denver Intl Newark

$514United Airlines

Wed, Oct 14 - Wed, Oct 21

10:50 am - 10:51 pmLHR London Heathrow-ONT Ontario

20h 01m2 stops Munich Franz Josef Strauss San Francisco

8:03 am - 11:10 amONT Ontario-LHR London Heathrow

19h 07m1 stop San Francisco

$514United Airlines

Wed, Oct 14 - Wed, Oct 21

7:25 am - 10:49 pmLHR London Heathrow-ONT Ontario

23h 24m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl

1:52 pm - 11:10 amONT Ontario-LHR London Heathrow

13h 18m1 stop San Francisco

$516United Airlines

Mon, Oct 12 - Mon, Oct 19

9:30 am - 8:15 pmLHR London Heathrow-ONT Ontario

18h 45m2 stops Frankfurt am Main San Francisco

4:17 pm - 9:20 pmONT Ontario-LHR London Heathrow

21h 03m2 stops San Francisco Newark

$516United Airlines

Wed, Nov 4 - Fri, Dec 4

9:00 am - 8:26 pmLHR London Heathrow-ONT Ontario

19h 26m2 stops Zurich San Francisco

6:00 am - 10:15 amONT Ontario-LHR London Heathrow

20h 15m1 stop Houston George Bush Intcntl

$516United Airlines

Thu, Jan 21 - Mon, Jan 25

7:30 am - 8:51 pmLHR London Heathrow-ONT Ontario

21h 21m2 stops Frankfurt am Main Denver Intl

5:45 am - 10:15 amONT Ontario-LHR London Heathrow

20h 30m1 stop Houston George Bush Intcntl

$516United Airlines

Wed, Nov 4 - Fri, Dec 4

7:25 am - 5:41 pmLHR London Heathrow-ONT Ontario

18h 16m2 stops Munich Franz Josef Strauss San Francisco

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

12h 00m1 stop Denver Intl

$516United Airlines

Tue, Oct 13 - Tue, Dec 8

1:50 pm - 9:32 pmLHR London Heathrow-ONT Ontario

15h 42m1 stop Dallas/Fort Worth

4:25 pm - 1:35 pmONT Ontario-LHR London Heathrow

13h 10m1 stop Phoenix Sky Harbor Intl

$642British Airways

Mon, Nov 2 - Sun, Nov 15

2:35 pm - 9:52 pmLHR London Heathrow-ONT Ontario

15h 17m1 stop Phoenix Sky Harbor Intl

4:25 pm - 1:35 pmONT Ontario-LHR London Heathrow

13h 10m1 stop Phoenix Sky Harbor Intl

$642British Airways

Tue, Nov 24 - Mon, Nov 30

Cheap last minute flights

Enter your travel dates to find the best prices.

5:45 pm - 10:40 pmLHR London Heathrow-ONT Ontario

36h 55m1 stop Seattle/Tacoma Intl

6:00 pm - 3:35 pmONT Ontario-LHR London Heathrow

13h 35m1 stop Seattle/Tacoma Intl

$497Virgin Atlantic

Mon, Sep 21 - Sun, Oct 4

5:45 pm - 10:40 pmLHR London Heathrow-ONT Ontario

36h 55m1 stop Seattle/Tacoma Intl

6:00 am - 3:35 pmONT Ontario-LHR London Heathrow

25h 35m1 stop Seattle/Tacoma Intl

$545Virgin Atlantic

Mon, Sep 21 - Sun, Oct 4

4:05 pm - 11:47 pmLHR London Heathrow-ONT Ontario

39h 42m2 stops Boston Logan Intl Salt Lake City

11:54 am - 11:20 amONT Ontario-LHR London Heathrow

15h 26m1 stop Seattle/Tacoma Intl

$545Virgin Atlantic

Mon, Sep 21 - Sun, Oct 4

4:00 pm - 12:50 pmLHR London Heathrow-ONT Ontario

28h 50m2 stops Newark Denver Intl

1:24 pm - 9:40 amONT Ontario-LHR London Heathrow

12h 16m1 stop Denver Intl

$547United Airlines

Mon, Sep 21 - Sun, Oct 4

10:35 am - 6:16 pmLHR London Heathrow-ONT Ontario

15h 41m1 stop San Francisco

1:24 pm - 9:40 amONT Ontario-LHR London Heathrow

12h 16m1 stop Denver Intl

$547United Airlines

Wed, Sep 23 - Wed, Sep 30

10:00 am - 9:59 pmLHR London Heathrow-ONT Ontario

19h 59m1 stop Houston George Bush Intcntl

6:00 am - 11:35 amONT Ontario-LHR London Heathrow

21h 35m1 stop Houston George Bush Intcntl

$547United Airlines

Mon, Sep 21 - Sun, Oct 4

12:00 pm - 10:59 pmLHR London Heathrow-ONT Ontario

18h 59m2 stops Newark Chicago O'Hare Intl

9:25 am - 11:35 amONT Ontario-LHR London Heathrow

18h 10m2 stops San Francisco Houston George Bush Intcntl

$548United Airlines

Sat, Sep 19 - Fri, Oct 2

1:40 pm - 9:59 pmLHR London Heathrow-ONT Ontario

16h 19m1 stop Houston George Bush Intcntl

1:22 pm - 12:25 pmONT Ontario-LHR London Heathrow

15h 03m1 stop Denver Intl

$548United Airlines

Sat, Sep 19 - Sat, Sep 26

4:55 pm - 11:36 pmLHR London Heathrow-ONT Ontario

14h 41m1 stop Dallas/Fort Worth

1:05 pm - 10:30 amONT Ontario-LHR London Heathrow

13h 25m1 stop Phoenix Sky Harbor Intl

$1,404British Airways

Sun, Sep 20 - Sat, Oct 3

4:55 pm - 11:36 pmLHR London Heathrow-ONT Ontario

14h 41m1 stop Dallas/Fort Worth

1:05 pm - 10:30 amONT Ontario-LHR London Heathrow

13h 25m1 stop Phoenix Sky Harbor Intl

$1,651British Airways

Sun, Sep 20 - Sat, Oct 3

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United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

Nov 11

LHR9:00 amLondon Heathrow

19h 15m

2 stops

ONT8:15 pmOntario

Nov 18

ONT6:00 amOntario

17h 40m

1 stop

LHR7:40 amLondon Heathrow

$511

United Airlines

Oct 14

LHR10:50 amLondon Heathrow

20h 01m

2 stops

ONT10:51 pmOntario

Oct 21

ONT8:03 amOntario

19h 07m

1 stop

LHR11:10 amLondon Heathrow

$514

United Airlines

Nov 4

LHR7:30 amLondon Heathrow

21h 21m

2 stops

ONT8:51 pmOntario

Dec 4

ONT5:45 amOntario

20h 30m

1 stop

LHR10:15 amLondon Heathrow

$516

Alaska Airlines flights from London to Ontario

Our best Alaska Airlines deals on London to Ontario flight tickets

Alaska Airlines

Dec 10

LHR2:45 pmLondon Heathrow

15h 54m

1 stop

ONT10:39 pmOntario

Dec 17

ONT8:59 pmOntario

31h 21m

1 stop

LHR12:20 pmLondon Heathrow

$571

Alaska Airlines

Oct 18

LHR5:00 pmLondon Heathrow

14h 42m

1 stop

ONT11:42 pmOntario

Oct 27

ONT2:13 pmOntario

15h 07m

1 stop

LHR12:20 pmLondon Heathrow

$573

Alaska Airlines

Oct 20

LHR5:00 pmLondon Heathrow

25h 17m

1 stop

ONT10:17 amOntario

Oct 27

ONT2:13 pmOntario

15h 07m

1 stop

LHR12:20 pmLondon Heathrow

$574

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 11/11

9:00 am-8:15 pm

2 stops19h 15m

Ontario

Wed 11/18

6:00 am-7:40 am

1 stop17h 40m

$511

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 10/14

7:25 am-8:31 pm

2 stops21h 06m

Ontario

Wed 10/21

5:00 am-7:15 am

2 stops18h 15m

$514

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 10/14

10:50 am-10:51 pm

2 stops20h 01m

Ontario

Wed 10/21

8:03 am-11:10 am

1 stop19h 07m

$514

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 10/12

7:25 am-10:49 pm

2 stops23h 24m

Ontario

Mon 10/19

1:52 pm-11:10 am

1 stop13h 18m

$516

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 11/4

9:30 am-8:15 pm

2 stops18h 45m

Ontario

Fri 12/4

4:17 pm-9:20 pm

2 stops21h 03m

$516

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 1/21

9:00 am-8:26 pm

2 stops19h 26m

Ontario

Mon 1/25

6:00 am-10:15 am

1 stop20h 15m

$516

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 11/4

7:30 am-8:51 pm

2 stops21h 21m

Ontario

Fri 12/4

5:45 am-10:15 am

1 stop20h 30m

$516

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 10/13

7:25 am-5:41 pm

2 stops18h 16m

Ontario

Tue 12/8

1:40 pm-9:40 am

1 stop12h 00m

$516

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 11/2

1:50 pm-9:32 pm

1 stop15h 42m

Ontario

Sun 11/15

4:25 pm-1:35 pm

1 stop13h 10m

$642

Quickest round-trip

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 11/24

2:35 pm-9:52 pm

1 stop15h 17m

Ontario

Mon 11/30

4:25 pm-1:35 pm

1 stop13h 10m

$642

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 London to Ontario

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 typical price of a round-trip flight between London and Ontario?

Prices are currently low for flights on this route.

Typical prices usually range from $619 to $766.
The lowest price recently found on this route was $511.

What is the cheapest month to fly to Ontario?

In general, January is the cheapest month to fly from London to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $553. If you aren’t able to travel during the month of January, then book flights to Ontario from London during February instead. Flights to Ontario in February, while not as cheap as those in January, still average around $597.

Can stopping save me money on London to Ontario flights?

You could potentially save up to 5% on your flight if you consider stops on a London to Ontario flight.

When to book flights from London to Ontario

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

Estimated round-trip price

Cheap London to Ontario (LON to ONT) flight deals and tips

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

Best Price Found	$445
Fastest flight time	13h 37m
Direct flights	None

The best one-way flight to Ontario from London in the past 72 hours is $445. The best round-trip flight deal from London to Ontario found on momondo in the last 72 hours is $511.

The fastest flight from London to Ontario takes 13h 37m

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

Search flight deals

Frequently asked questions about flying from London to Ontario

How far is London to Ontario by plane?
The distance between London and Ontario is about 5417.5 mi. Typically, this will take 13h 37m by plane in normal conditions.
When did momondo last update prices for flights from London to Ontario Airport?
Prices for flights from London to Ontario Airport are updated daily.
How many operators does momondo search for flights from London to Ontario Airport?
As of September 2026, there is 1 operator available to choose from for flights from London to Ontario Airport.
How old do you have to be to fly from London to Ontario Airport?
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 London to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from London to Ontario

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

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom $567	Free Cancellation	Rating 6.7 8,229 reviews		Search British Airways flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from London.

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

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

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

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

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

Of course. momondo tracks the price of London to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Ontario trip

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Cheap flights from London to Los Angeles from $445

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Los Angeles departing on 12/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

Alaska Airlines flights from London to Ontario

Our best Alaska Airlines deals on London to Ontario flight tickets

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How to get the cheapest flight ticket from London to Ontario

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

What is the cheapest month to fly to Ontario?

Can stopping save me money on London to Ontario flights?

What is the cheapest airline that flies from London to Ontario?

What airlines fly to Ontario?

When to book flights from London to Ontario

Cheap London to Ontario (LON to ONT) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from London to Ontario

Best airlines flying from London to Ontario

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

Why use momondo?

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing California

Fly your favorite airline to Los Angeles

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Los Angeles

List of cabin classes available on flights landing in Los Angeles. Availability may vary depending on flight origin and airline.

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