Cheap Flights from Ontario (ONT) to London (LON)

View AU$646 flight on Mon, 11 May 2026Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to London

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Cheap Flights from Ontario (ONT) to London (LON)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, 1 Apr - Fri, 10 Apr
ONT
Ontario
LHR
London
AU$1,145 Return, found 6 days ago
AU$1,145
Return
found 6 days ago
Select United flight, departing Wed, 1 Apr from Ontario to London, returning Fri, 10 Apr, priced at AU$1,145 found 6 days ago
United
Mon, 30 Mar - Thu, 9 Apr
ONT
Ontario
LHR
London
AU$1,194 Return, found 4 days ago
AU$1,194
Return
found 4 days ago
Select United flight, departing Mon, 30 Mar from Ontario to London, returning Thu, 9 Apr, priced at AU$1,194 found 4 days ago
United
Thu, 7 May - Wed, 20 May
ONT
Ontario
LHR
London
AU$1,215 Return, found 4 days ago
AU$1,215
Return
found 4 days ago
Select United flight, departing Thu, 7 May from Ontario to London, returning Wed, 20 May, priced at AU$1,215 found 4 days ago
United
Sun, 5 Apr - Tue, 21 Apr
ONT
Ontario
LHR
London
AU$1,225 Return, found 2 hours ago
AU$1,225
Return
found 2 hours ago
Select United flight, departing Sun, 5 Apr from Ontario to London, returning Tue, 21 Apr, priced at AU$1,225 found 2 hours ago
Alaska Airlines
Wed, 28 Oct - Thu, 12 Nov
ONT
Ontario
LHR
London
AU$1,225 Return, found 2 days ago
AU$1,225
Return
found 2 days ago
Select Alaska Airlines flight, departing Wed, 28 Oct from Ontario to London, returning Thu, 12 Nov, priced at AU$1,225 found 2 days ago
United
Tue, 21 Apr - Tue, 28 Apr
ONT
Ontario
LHR
London
AU$1,234 Return, found 3 days ago
AU$1,234
Return
found 3 days ago
Select United flight, departing Tue, 21 Apr from Ontario to London, returning Tue, 28 Apr, priced at AU$1,234 found 3 days ago
United
Wed, 8 Apr - Wed, 6 May
ONT
Ontario
LHR
London
AU$1,288 Return, found 1 day ago
AU$1,288
Return
found 1 day ago
Select United flight, departing Wed, 8 Apr from Ontario to London, returning Wed, 6 May, priced at AU$1,288 found 1 day ago
Delta
Fri, 1 May - Fri, 8 May
ONT
Ontario
LHR
London
AU$1,306 Return, found 3 days ago
AU$1,306
Return
found 3 days ago
Select Delta flight, departing Fri, 1 May from Ontario to London, returning Fri, 8 May, priced at AU$1,306 found 3 days ago
Virgin Atlantic
Mon, 11 May - Sun, 14 June
ONT
Ontario
LHR
London
AU$1,414 Return, found 6 days ago
AU$1,414
Return
found 6 days ago
Select Virgin Atlantic flight, departing Mon, 11 May from Ontario to London, returning Sun, 14 June, priced at AU$1,414 found 6 days ago
American Airlines
Sun, 5 Apr - Tue, 5 May
ONT
Ontario
LGW
London
AU$1,448 Return, found 1 day ago
AU$1,448
Return
found 1 day ago
Select American Airlines flight, departing Sun, 5 Apr from Ontario to London, returning Tue, 5 May, priced at AU$1,448 found 1 day ago

Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Heathrow LHR. Cheapest option available. Average driving time to city centre is 28 minutes. Flights from AU$1,367
LHR
Heathrow
Cheapest
Average driving time to city centre28 min
Flights from AU$1,367
Select flight to Gatwick LGW. Average driving time to city centre is 52 minutes. Flights from AU$1,788
LGW
Gatwick
Average driving time to city centre52 min
Flights from AU$1,788

Find the cheapest month to fly from Ontario (ONT) to London (LON)

November is typically the cheapest month to fly

From AU$819 - AU$1,729 per traveller.

Frequently asked questions

How much is a flight from Ontario Airport to London (LON-All Airports)?
Within the past 7 days on Expedia, for flights departing within the next year, the lowest price available for a round-trip flight from Los Angeles - Ontario Intl. Airport (ONT) to London (LON-All Airports) was AU$1,145. Fares this good don't wait forever, so book yours today. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Los Angeles - Ontario Intl. Airport (ONT) to London (LON-All Airports)?
The majority of flights can be cancelled online, but whether you incur a fee varies between airlines. If you do need to cancel your getaway, follow the instructions in the Customer Service Portal.
How do I find cheap flights from ONT to London (LON-All Airports) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for ONT to London (LON-All Airports) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from ONT to London (LON-All Airports)?
With a flight distance of 8 700 kilometres from Ontario Airport (ONT) to London (LON-All Airports) (LON), this is a long-haul journey. Remember to keep well hydrated and get up to stretch your legs from time to time.
Which airlines fly direct from Ontario Airport to London (LON-All Airports)?
You won't find any airlines operating directly between Ontario Airport and London (LON-All Airports), so be ready to make at least one stop on your journey. A layover can be a nice way to break up a trip!
Are Los Angeles - Ontario Intl. Airport (ONT) to London (LON-All Airports) flight tickets cheaper when they're purchased at the last minute?
Last-minute planners can occasionally find a bargain, with some super cheap fares from ONT to London (LON-All Airports) popping up a few weeks prior to the departure date. If you'd rather plan ahead of time, Expedia compares and updates the best flight deals continually — as early as 12 months in advance in some cases. It depends on the carrier though, as not all airlines issue prices that far in advance.

Travel information

Origin airport
Los Angeles - Ontario Intl.
Destination airport
Heathrow
Return price
AU$1,145
Distance
8655 km

Book with confidence

Your quick guide to flights from Ontario to London

Pick up great flights from Ontario to London

With Expedia, you have your pick of flights a day with 20 airlines covering flights from Ontario to London. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from Ontario to London that take around hours.

Find cheap flights from Ontario to London

From the great flight deals with prices currently ranging from AU$1,145 to AU$1,448, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from Ontario to London around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to London is normally in April.

Reasons to book your flight from Ontario to London with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from Ontario to London across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to London right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Your quick guide to flights from Ontario to London
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