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

View AU$599 flight on Mon, 12 Jan 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.

Delta
Tue, 30 Dec - Tue, 20 Jan
ONT
Ontario
LHR
London
AU$950 Return, found 5 days ago
AU$950
Return
found 5 days ago
Select Delta flight, departing Tue, 30 Dec from Ontario to London, returning Tue, 20 Jan, priced at AU$950 found 5 days ago
Delta
Tue, 13 Jan - Thu, 22 Jan
ONT
Ontario
LHR
London
AU$952 Return, found 1 day ago
AU$952
Return
found 1 day ago
Select Delta flight, departing Tue, 13 Jan from Ontario to London, returning Thu, 22 Jan, priced at AU$952 found 1 day ago
United
Mon, 1 Dec - Sun, 7 Dec
ONT
Ontario
LHR
London
AU$969 Return, found 2 days ago
AU$969
Return
found 2 days ago
Select United flight, departing Mon, 1 Dec from Ontario to London, returning Sun, 7 Dec, priced at AU$969 found 2 days ago
United
Thu, 11 Dec - Wed, 24 Dec
ONT
Ontario
LHR
London
AU$972 Return, found 9 hours ago
AU$972
Return
found 9 hours ago
Select United flight, departing Thu, 11 Dec from Ontario to London, returning Wed, 24 Dec, priced at AU$972 found 9 hours ago
Delta
Thu, 8 Jan - Sun, 25 Jan
ONT
Ontario
LHR
London
AU$985 Return, found 7 hours ago
AU$985
Return
found 7 hours ago
Select Delta flight, departing Thu, 8 Jan from Ontario to London, returning Sun, 25 Jan, priced at AU$985 found 7 hours ago
Delta
Thu, 15 Jan - Thu, 22 Jan
ONT
Ontario
LHR
London
AU$988 Return, found 3 days ago
AU$988
Return
found 3 days ago
Select Delta flight, departing Thu, 15 Jan from Ontario to London, returning Thu, 22 Jan, priced at AU$988 found 3 days ago
KLM
Tue, 30 Dec - Tue, 20 Jan
ONT
Ontario
LHR
London
AU$990 Return, found 5 days ago
AU$990
Return
found 5 days ago
Select KLM flight, departing Tue, 30 Dec from Ontario to London, returning Tue, 20 Jan, priced at AU$990 found 5 days ago
Delta
Thu, 11 Dec - Thu, 18 Dec
ONT
Ontario
LHR
London
AU$1,029 Return, found 5 days ago
AU$1,029
Return
found 5 days ago
Select Delta flight, departing Thu, 11 Dec from Ontario to London, returning Thu, 18 Dec, priced at AU$1,029 found 5 days ago
American Airlines
Tue, 2 Dec - Thu, 11 Dec
ONT
Ontario
LGW
London
AU$1,193 Return, found 4 days ago
AU$1,193
Return
found 4 days ago
Select American Airlines flight, departing Tue, 2 Dec from Ontario to London, returning Thu, 11 Dec, priced at AU$1,193 found 4 days ago
Virgin Atlantic
Mon, 24 Nov - Mon, 1 Dec
ONT
Ontario
LHR
London
AU$1,327 Return, found 6 days ago
AU$1,327
Return
found 6 days ago
Select Virgin Atlantic flight, departing Mon, 24 Nov from Ontario to London, returning Mon, 1 Dec, priced at AU$1,327 found 6 days ago

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

September is typically the cheapest month to fly

From AU$802 - AU$1,592 per traveller.
Flight from Ontario to London route information
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Heathrow
Return price
AU$950
Distance
8655 km

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$950 to AU$1,327, 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 December.

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.

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$950. 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.

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