S$1,326 Cheap Flights from London to Ontario

View S$1,326 flight on Thu, 25 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 S$1,326 for one-way flights and S$738 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Mon, 8 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
S$738 Return, found 5 days ago
S$738
Return
found 5 days ago
Select American Airlines flight, departing Mon, 8 Sep from London to Ontario, returning Sun, 14 Sep, priced at S$738 found 5 days ago
American Airlines
Mon, 8 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
S$753 Return, found 5 days ago
S$753
Return
found 5 days ago
Select American Airlines flight, departing Mon, 8 Sep from London to Ontario, returning Sun, 14 Sep, priced at S$753 found 5 days ago
American Airlines
Mon, 8 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
S$761 Return, found 5 days ago
S$761
Return
found 5 days ago
Select American Airlines flight, departing Mon, 8 Sep from London to Ontario, returning Sun, 14 Sep, priced at S$761 found 5 days ago
Iberia
Mon, 8 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
S$776 Return, found 5 days ago
S$776
Return
found 5 days ago
Select Iberia flight, departing Mon, 8 Sep from London to Ontario, returning Sun, 14 Sep, priced at S$776 found 5 days ago
British Airways
Mon, 8 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
S$784 Return, found 5 days ago
S$784
Return
found 5 days ago
Select British Airways flight, departing Mon, 8 Sep from London to Ontario, returning Sun, 14 Sep, priced at S$784 found 5 days ago
Iberia
Mon, 8 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
S$784 Return, found 5 days ago
S$784
Return
found 5 days ago
Select Iberia flight, departing Mon, 8 Sep from London to Ontario, returning Sun, 14 Sep, priced at S$784 found 5 days ago
American Airlines
Mon, 8 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
S$787 Return, found 5 days ago
S$787
Return
found 5 days ago
Select American Airlines flight, departing Mon, 8 Sep from London to Ontario, returning Sun, 14 Sep, priced at S$787 found 5 days ago
British Airways
Mon, 8 Sep - Sun, 14 Sep
LHR
London
ONT
Ontario
S$798 Return, found 5 days ago
S$798
Return
found 5 days ago
Select British Airways flight, departing Mon, 8 Sep from London to Ontario, returning Sun, 14 Sep, priced at S$798 found 5 days ago
Virgin Atlantic
Thu, 25 Sep - Tue, 30 Sep
LHR
London
ONT
Ontario
S$825 Return, found 4 days ago
S$825
Return
found 4 days ago
Select Virgin Atlantic flight, departing Thu, 25 Sep from London to Ontario, returning Tue, 30 Sep, priced at S$825 found 4 days ago
Finnair
Thu, 25 Sep - Tue, 30 Sep
LHR
London
ONT
Ontario
S$841 Return, found 4 days ago
S$841
Return
found 4 days ago
Select Finnair flight, departing Thu, 25 Sep from London to Ontario, returning Tue, 30 Sep, priced at S$841 found 4 days ago

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

November is typically the cheapest month to fly

From S$647 - S$1,575 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
S$738
Distance
8655 km

Perfect flights from London to Ontario

Your Journey from London to Ontario

Start your unforgettable journey with Expedia. Our broad selection of flights from London to Ontario 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 American Airlines, Iberia, British Airways, Virgin Atlantic, Finnair, Lufthansa, Delta. Our selection of flights from Heathrow to Los Angeles - Ontario Intl. 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 London to Ontario Flights

Experience the joy of finding cheap flights from Heathrow to Los Angeles - Ontario Intl. that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$1,326 and roundtrip prices from S$738*.
 

Pre-Flight Essentials

Ensure a smooth journey from London to Ontario 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 Ontario

Picture yourself stepping off the plane in Ontario 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 London to Ontario 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 London to Ontario.
 

Beyond the Flight – Exploring Ontario

With Expedia, your adventure extends beyond the flight. Explore Ontario 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 London to Ontario 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 London to Ontario 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 LHR to Ontario Airport?
Start packing your bags, because round-trip flights between London Heathrow and ONT start from S$738. 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.

Explore a world of travel with Expedia

Ontario Airports

Los Angeles

London to Los Angeles Intl.
S$671.20

Orange County

London Airports

London

*Available to Expedia members.