$660 Cheap Flights from Ontario to London

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly from Los Angeles - Ontario Intl. to Heathrow

Amazing ONT to LHR Flight Deals

The cheapest flights to Heathrow found within the past 7 days were $731 round trip and $660 one way. Prices and availability subject to change. Additional terms may apply.

Frequently asked questions

Can I catch a flight from Los Angeles - Ontario Intl. Airport (ONT) to Heathrow Airport right now?
Be sure to check out our Covid-19 Travel Advisor to learn if there are any present quarantine requirements and travel advice reports in place in LHR when flying from Ontario Airport.
Are there direct flights from ONT to Heathrow Airport?
You’ll need to be prepared for a stopover when jetting from ONT to London Heathrow. There are no direct flights on this route, however American Airlines, British Airways and Delta will get you to your destination as quickly as possible.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to Heathrow Airport (LHR), please visit our Customer Service Portal.
How long is the flight from Los Angeles - Ontario Intl. Airport (ONT) to LHR?
It takes approximately 13 hours and 4 minutes to get from Ontario to London. For such a lengthy flight, you’ll benefit from being as comfortable as possible. Consider bringing a neck pillow for better sleep, packing some healthy snacks and wearing comfortable shoes and clothing.
What is the flight distance from Ontario Airport to London Heathrow?
The flight distance from ONT to Heathrow Airport is 5,400 mi. Sleeping mask? Check. Earplugs? Check. You’re going to need all the long-haul creature comforts for this long-haul flight.
What airlines fly from Ontario Airport to London Heathrow?
No direct flights are between Los Angeles - Ontario Intl. Airport (ONT) and London Heathrow. Plan in advance to save time and find a route with the least amount of stopovers.
What airlines have practices regarding COVID-19 in place and use social distancing?
From the moment you enter the departure terminal to when you leave the arrivals terminal, if you’re flying with British Airways, Virgin Atlantic or SAS you can be sure that COVID-19 measures and social distancing rules have been adhered to. Many airlines have introduced capped capacity flights and keeping the middle seat empty.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It’s possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.


Traveling From Los Angeles - Ontario Intl.
Traveling To Heathrow
Shortest Flight Time hours mins
Earliest Departure Time
Latest Departure Time
Lowest Flight Price $731

Route Info

Flight path for flights from LA/Ontario International Airport to London Heathrow Airport.

5,747.00 miles

Discover our best flights from Ontario ONT to London LHR. 

With 19 airlines to choose from on Travelocity, you can easily find the best option for you. Use our filters to sort by price, compare airlines, and find the most convenient flight times. 


Find our best return flights from Ontario ONT to London LHR at the right price  

Airfares to London LHR from Ontario ONT currently cost between $731 and $786. It’s usually cheaper to book a round trip than two separate one-way flights. Prices and availability subject to change. Additional terms may apply. 


Book one-way flights from Ontario ONT to London LHR 

If you want to be flexible about when you return, or keep your travel options open ended, a one-way flight could be just the ticket! You’ll find one-way airfares from Ontario ONT to London LHR on Travelocity starting at $660. Prices and availability subject to change. Additional terms may apply. 


Get to London LHR from Ontario ONT quicker with direct flights. 

Get to London faster, without the hassle of changing planes and moving baggage, by booking a direct flight. Expect your direct flight to LHR from ONT to take around hour(s) min(s).  


Find our cheapest airfares for flights from Ontario ONT to London LHR

Find cheap flight deals by using our search filters to sort results starting with the lowest price airfares to LHR from ONT. Our Price Match Promise means if you find a lower rate on Travelocity.com or on another US-based website within 24 hours of booking, we’ll credit or refund the difference.  


Get our best airfare deals for your flight from Ontario ONT to London LHR today 

If you’re flexible about when you travel, November is usually the cheapest month to fly from Ontario ONT to London LHR. If you need to be more specific, search by date and arrival and departure times.Then, compare prices across different airlines, and sort results by lowest price first. 


Book flexible airline tickets for flights to London LHR from Ontario ONT 

Some airlines let you change your travel dates without charging a fee. Use our ‘no change fee’ filter to see which flights to LHR from ONT have this option.  


Travel with confidence when you book flights to London LHR from Ontario ONT with Travelocity 

We’ve secured fantastic deals with all the main airline carriers and it’s easy to compare, choose, and book with Travelocity. With 24/7 customer service and our free 'App', we’ll always keep you moving. 

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.