CA $647 Cheap Flights from Ontario (ONT) to London (LHR)

View CA $647 flight on Sat, Aug. 2, 2025Opens in a new window

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Cheap flights from Ontario (ONT) to London (LHR)

Prices were available within the past 7 days and start at CA $647 for one-way flights and CA $1,189 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue., May 6 - Sun., May 11
ONT
Ontario
LHR
London
CA $1,189 Roundtrip, found 5 days ago
CA $1,189
Roundtrip
found 5 days ago
Select United flight, departing Tue., May 6 from Ontario to London, returning Sun., May 11, priced at CA $1,189 found 5 days ago
United
Tue., May 6 - Sun., May 11
ONT
Ontario
LHR
London
CA $1,467 Roundtrip, found 6 days ago
CA $1,467
Roundtrip
found 6 days ago
Select United flight, departing Tue., May 6 from Ontario to London, returning Sun., May 11, priced at CA $1,467 found 6 days ago
American Airlines
Sat., Aug. 2 - Sat., Aug. 16
ONT
Ontario
LHR
London
CA $1,560 Roundtrip, found 4 days ago
CA $1,560
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat., Aug. 2 from Ontario to London, returning Sat., Aug. 16, priced at CA $1,560 found 4 days ago
United
Tue., May 6 - Sun., May 11
ONT
Ontario
LHR
London
CA $1,594 Roundtrip, found 17 hours ago
CA $1,594
Roundtrip
found 17 hours ago
Select United flight, departing Tue., May 6 from Ontario to London, returning Sun., May 11, priced at CA $1,594 found 17 hours ago
United
Tue., May 6 - Sun., May 11
ONT
Ontario
LHR
London
CA $1,872 Roundtrip, found 17 hours ago
CA $1,872
Roundtrip
found 17 hours ago
Select United flight, departing Tue., May 6 from Ontario to London, returning Sun., May 11, priced at CA $1,872 found 17 hours ago
Flight from Ontario to London (ONT - LHR) route information
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Heathrow
Airlines serving
United
Roundtrip price
CA $1,188
Distance
8655 km

Los Angeles to London Flights

Ready for an adventure? Thought so! Prepare to see the sights when you book your trip from Los Angeles to London with Expedia.ca. Whether you’re visiting for business or pleasure, we know how important it is to bring home travel stories. Maybe your tales will include the best dinner of your life, or the weirdest street art you saw in the city, or the concert that turned you into a fan of a new band. Whatever it is, your new favourite anecdote is right around the corner. Book your trip from ONT to LHR and begin your journey!

Getting a cheap deal on your trip sets the tone for the perfect holiday. And with Expedia.ca, you know you can travel from Los Angeles to London on the cheap, with enough money left over for a stellar time in the city. That could mean more tours with the kids, more concerts with the spouse, more dessert amongst co-workers, or even front row seats to a sports game if you’re travelling solo. It’s your holiday! Make it great.

Travelling shouldn’t cost an arm and a leg before you even get to relax on the plane’s armrests. Count on Expedia.ca to get you the best discounts on flights from ONT to LHR. And remember this: You can also save big when you bundle. Add a hotel or car rental deal to your flight and witness those savings add up. Hey, more money for more souvenirs, right? Right! Pack your bags and we’ll see you on the route.

Combine your London flight with a hotel and/or car rental for a package deal designed to save you even more money! Discover additional savings by booking in advance or find a last minute deal. There are tons of ways to save on your flights from with Expedia Canada. Use us as your top travel destination and have the confidence that you’re getting a bargain!

Frequently asked questions

How much is a flight from Los Angeles - Ontario Intl. Airport (ONT) to Heathrow Airport (LHR)?
Within the past 7 days on Expedia, for flights departing within the next year, the lowest price listed for a round-trip journey from Ontario Airport to Heathrow Airport was CA $1,189. Cheap tickets don’t stick around for long, so make sure you book yours ASAP. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from ONT to Heathrow Airport (LHR)?
This varies between airlines, as each has its own terms and conditions. Head to the Customer Service Portal, where there are instructions on how to cancel online.
How do I find cheap flights from Ontario Airport to London Heathrow 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 Los Angeles - Ontario Intl. Airport (ONT) to Heathrow Airport flights, you’ll see a “no change fees” filter for you to select.
How far is the flight from ONT to Heathrow Airport?
With a flight distance of 8,700 kilometers between Ontario and Hounslow, this is a long-haul trip. Make sure you keep well hydrated and move your legs every now and then.
Which airlines fly direct from Los Angeles - Ontario Intl. Airport (ONT) to LHR?
At present, no airlines offer flights directly from Ontario Airport to London Heathrow. You’ll have to book a flight with one or more stops. To score the best price and connections, lock in your airfare ahead of time.
Are Los Angeles - Ontario Intl. Airport (ONT) to Heathrow Airport (LHR) flight tickets cheaper when they're purchased at the last minute?
Flight prices are always on the move, so there are no guarantees. While last-minute deals between Ontario Airport and Heathrow Airport are of course possible, it also makes sense to keep a close eye on prices well before you fly. In fact, some air carriers publicize their prices up to a year prior to the departure date. Expedia is constantly updating the biggest airfare bargains around, so keep checking and be ready to pounce when the price is right.

Explore a world of travel with Expedia

Ontario nearby Airports

Los Angeles

Los Angeles Intl. to London
CA $703.72

Orange County

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CA $1,031.24

Burbank

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