S$521 Cheap Flights from Ontario to London

View S$521 flight on Sat, 16 Aug, 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 40% on select hotels after you book a flight*
  • payments icon
    Earn twice
    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Ontario to London (ONT-LHR)

Prices were available within the past 7 days and start at S$521 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

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

September is typically the cheapest month to fly

From S$678 - S$1,300 per traveller.

Graph displaying average flight prices per month

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

Perfect flights from Ontario to London

Your Journey from Ontario to London

Start your unforgettable journey with Expedia. Our broad selection of flights from Ontario to London caters to every travel need. Whether you're yearning for a romantic escape, a solo adventure, or a cultural immersion, we've got you covered.
 

Choosing Your Ideal Flight

With Expedia, you have access to a wide range of airlines, including United, Virgin Atlantic, Delta, Air Canada, KLM, Air France, American Airlines, Iberia, British Airways. Our selection of flights from Los Angeles - Ontario Intl. to Heathrow caters to every traveler's requirements, ensuring your journey aligns with your schedule. With options from 20 airlines, you're bound to find the perfect flight.
 

Maximizing Value with Ontario to London Flights

Experience the joy of finding cheap flights from Los Angeles - Ontario Intl. to Heathrow that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$521 and roundtrip prices *.
 

Pre-Flight Essentials

Ensure a smooth journey from Ontario to London with Expedia. From information about check-in times and in-flight amenities to guidance on baggage policies, we provide all the essentials to prepare you for your flight.
 

Experience the Vibrant London

Picture yourself stepping off the plane in London and immersing yourself in the unique atmosphere of . From local markets to cultural festivals, each city offers its distinct charm. Make the most of your trip by exploring local attractions and indulging in the local cuisine. With Expedia, explore all this and more, tailored to your budget.
 

Added Convenience on Your Ontario to London Flight

Traveling with Expedia is more than just a flight. We offer details about in-flight amenities, baggage policies, and more to ensure a smooth and hassle-free journey. Choose from our variety of airlines and embark on a memorable journey from Ontario to London.
 

Beyond the Flight – Exploring London

With Expedia, your adventure extends beyond the flight. Explore London at your own pace by renting a car or booking a hotel. Discover hidden gems off the beaten path and create unforgettable memories.
 

Book Your Flight from Ontario to London with Confidence

Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support make your travel experience seamless and stress-free. Embark on your journey from Ontario to London with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.

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 . 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 kilometres 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 Airports

Los Angeles

Los Angeles Intl. to London
S$655.00

Burbank

Long Beach

*Available to Expedia members.