€536 Cheap Flights London to Ontario (LHR-ONT)

View €536 flight on Fri, 5 Sep 2025Opens in a new window

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

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Cheap flights from London to Ontario (LHR-ONT)

Prices were available within the past 7 days and start at €536 for one-way flights and €484 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Mon, 1 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
€484 Return, found 2 days ago
€484
Return
found 2 days ago
Select British Airways flight, departing Mon, 1 Sep from London to Ontario, returning Sun, 14 Sep, priced at €484 found 2 days ago
American Airlines
Mon, 1 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
€493 Return, found 2 days ago
€493
Return
found 2 days ago
Select American Airlines flight, departing Mon, 1 Sep from London to Ontario, returning Sun, 14 Sep, priced at €493 found 2 days ago
Iberia
Mon, 1 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
€493 Return, found 2 days ago
€493
Return
found 2 days ago
Select Iberia flight, departing Mon, 1 Sep from London to Ontario, returning Sun, 14 Sep, priced at €493 found 2 days ago
American Airlines
Mon, 1 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
€503 Return, found 2 days ago
€503
Return
found 2 days ago
Select American Airlines flight, departing Mon, 1 Sep from London to Ontario, returning Sun, 14 Sep, priced at €503 found 2 days ago
British Airways
Tue, 14 Apr - Tue, 28 Apr
LHR
London
ONT
Ontario
€504 Return, found 3 days ago
€504
Return
found 3 days ago
Select British Airways flight, departing Tue, 14 Apr from London to Ontario, returning Tue, 28 Apr, priced at €504 found 3 days ago
American Airlines
Mon, 1 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
€508 Return, found 2 days ago
€508
Return
found 2 days ago
Select American Airlines flight, departing Mon, 1 Sep from London to Ontario, returning Sun, 14 Sep, priced at €508 found 2 days ago
British Airways
Mon, 1 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
€510 Return, found 2 days ago
€510
Return
found 2 days ago
Select British Airways flight, departing Mon, 1 Sep from London to Ontario, returning Sun, 14 Sep, priced at €510 found 2 days ago
KLM
Mon, 1 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
€516 Return, found 2 days ago
€516
Return
found 2 days ago
Select KLM flight, departing Mon, 1 Sep from London to Ontario, returning Sun, 14 Sep, priced at €516 found 2 days ago
American Airlines
Mon, 1 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
€518 Return, found 2 days ago
€518
Return
found 2 days ago
Select American Airlines flight, departing Mon, 1 Sep from London to Ontario, returning Sun, 14 Sep, priced at €518 found 2 days ago
Air France
Mon, 1 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
€548 Return, found 2 days ago
€548
Return
found 2 days ago
Select Air France flight, departing Mon, 1 Sep from London to Ontario, returning Sun, 14 Sep, priced at €548 found 2 days ago

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

November is typically the cheapest month to fly

From €432 - €1,052 per traveller.

Graph displaying average flight prices per month

London to Ontario route information
Origin airport
Heathrow
Destination airport
Los Angeles - Ontario Intl.
Return price
€483
Distance
8655 km

Perfect flights from London to Ontario

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from London to Ontario. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Heathrow to Los Angeles - Ontario Intl. ticket options cater to your travel preferences, with incredible one-way fares from €536 and roundtrip prices from €484. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Los Angeles - Ontario Intl. and explore and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in Ontario.

Frequently asked questions

How much is a flight from LHR to Ontario Airport?
Start packing your bags, because round-trip flights between London Heathrow and ONT start from €484. That's based on fares listed within the last 7 days on Expedia for flights departing within the next year. Prices can rise quickly, so book now to nab the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from LHR to ONT?
The majority of flights can be cancelled online, but whether you are charged a fee depends on your airline. If you do need to cancel your getaway, follow the instructions in the Customer Service Portal.
How do I find cheap flights from London Heathrow to Ontario Airport 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 Heathrow Airport (LHR) to Ontario Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Heathrow Airport (LHR) to Ontario Airport?
Hounslow to Ontario is around 8,700 kilometres, so get ready to spend quite a while in the air. Make sure you pack all the essentials, from your hoodie to your headphones. Take some snacks to nibble on throughout your trip too.
Which airlines fly direct from Heathrow Airport to Ontario Airport?
At the moment, no airlines offer flights directly from Heathrow Airport to ONT. You'll have to book a flight with one or more stops. To score the best price and connections, lock in your airfare well ahead of time.
Are LHR to Los Angeles - Ontario Intl. Airport (ONT) flight tickets cheaper when they're purchased at the last minute?
Last-minute bookings from Heathrow Airport (LHR) to Ontario Airport can be hit-or-miss. You may be able to find a bargain, but then again, you could miss out altogether! If you'd prefer to start planning your trip ahead of time, Expedia compares flight deals up to a year in advance. Just keep in mind that not all airlines issue their prices that far in advance. Our top tip? Check back often as prices are updated frequently.

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