United States
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ONT - LON

$317 Find Cheap Flights from Ontario to London - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$631
Typical prices: $686-$1,179
Multiple Airlines
Thu 11/22Tue 12/4
ONT - LHR • 3 stops
Cheapest one-way
$317
Typical prices: $482-$684
JetBlue
Fri 10/19
ONT - LHR • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Ontario and London. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
June
Cheapest • 41% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Phoenix Sky Harbor Intl (PHX)
Cheapest • Avg $916 (round-trip)
Salt Lake City (SLC)
Shortest trip • 13h 05m (one-way)
Insights
Insights
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We hope you love your trip to London!

Cheap Flights from Ontario to London (ONT-LON)

 

Cheap flights from Ontario to London with top airlines, updated regularly. Compare round-trip, one-way, direct and last-minute deals.

Sun, Nov 22 - Fri, Dec 4
Multiple Airlines Logo
10:40 pm - 5:40 pmONT  Ontario-LHR London Heathrow
35h 00m3 stops Las Vegas Harry Reid Intl San Francisco Kastrup Copenhagen
Multiple Airlines Logo
7:30 pm - 11:23 pmLHR  London Heathrow-ONT Ontario
35h 53m2 stops Kastrup Copenhagen San Francisco
$631Multiple Airlines
Tue, Nov 17 - Tue, Nov 24
Multiple Airlines Logo
10:35 am - 9:40 pmONT  Ontario-LHR London Heathrow
27h 05m3 stops Las Vegas Harry Reid Intl San Francisco Kastrup Copenhagen
Multiple Airlines Logo
6:40 am - 12:24 amLHR  London Heathrow-ONT Ontario
25h 44m2 stops Kastrup Copenhagen San Francisco
$667Multiple Airlines
Tue, Mar 2 - Fri, Mar 5
United Airlines Logo
6:35 pm - 7:25 amONT  Ontario-LHR London Heathrow
28h 50m1 stop San Francisco
United Airlines Logo
6:50 am - 6:44 pmLHR  London Heathrow-ONT Ontario
19h 54m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
$751United Airlines
Tue, Mar 2 - Fri, Mar 5
United Airlines Logo
6:35 pm - 7:25 amONT  Ontario-LHR London Heathrow
28h 50m1 stop San Francisco
United Airlines Logo
6:50 am - 6:44 pmLHR  London Heathrow-ONT Ontario
19h 54m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
$752United Airlines
Mon, Jan 11 - Fri, Jan 22
Alaska Airlines Logo
7:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
21h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 10:41 pmLHR  London Heathrow-ONT Ontario
15h 56m1 stop Seattle/Tacoma Intl
$802Alaska Airlines
Tue, Feb 2 - Tue, Feb 9
Alaska Airlines Logo
7:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
21h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 10:41 pmLHR  London Heathrow-ONT Ontario
15h 56m1 stop Seattle/Tacoma Intl
$802Alaska Airlines
Mon, Mar 8 - Tue, Mar 23
British Airways Logo
12:49 pm - 10:00 amONT  Ontario-LHR London Heathrow
13h 11m1 stop Dallas/Fort Worth
British Airways Logo
1:50 pm - 10:25 pmLHR  London Heathrow-ONT Ontario
15h 35m1 stop Dallas/Fort Worth
$846British Airways
Tue, Feb 2 - Tue, Feb 9
British Airways Logo
4:19 pm - 1:35 pmONT  Ontario-LHR London Heathrow
13h 16m1 stop Phoenix Sky Harbor Intl
British Airways Logo
11:15 am - 6:51 pmLHR  London Heathrow-ONT Ontario
15h 36m1 stop Dallas/Fort Worth
$848British Airways
Tue, Feb 9 - Wed, Feb 17
Delta Logo
1:00 pm - 10:00 amONT  Ontario-LHR London Heathrow
13h 00m1 stop Salt Lake City
Delta Logo
10:00 am - 10:14 pmLHR  London Heathrow-ONT Ontario
20h 14m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
$875Delta
Sun, Feb 7 - Wed, Feb 17
Delta Logo
12:00 pm - 9:00 amONT  Ontario-LHR London Heathrow
13h 00m1 stop Atlanta Hartsfield-Jackson
Delta Logo
10:00 am - 10:14 pmLHR  London Heathrow-ONT Ontario
20h 14m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
$875Delta

Price, demand and travel trends for Ontario to London flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

What is the cheapest Ontario to London flight route?

There's little price difference between Ontario to London routes. They average around $893 round-trip, based on KAYAK data over the past 12 months.

What's the cheapest day of the week to fly from Ontario to London?

Based on deals KAYAK users found in the last 12 months, Thursday is the cheapest day of the week to fly from Ontario to London. It’s 27% cheaper than the average day, while Wednesday is the most expensive, with prices 7% higher.

What’s the cheapest month to fly from Ontario to London?

•June is the cheapest month to fly from Ontario to London at $530 round-trip.
•July ($1,327) and January ($1,267) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 150% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

Key details for Ontario to London flights

Low season

February

Cheapest flight

$317
Beat the crowds with an average 85% drop in travelers.
The most popular month to fly with an average 86% increase in travelers.
One-way flight from Ontario to London Heathrow Airport

When to book flights from Ontario to London

Are your dates flexible? Find out the best times to travel from Ontario to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Ontario to London flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Ontario to London?

    Four cabin classes are available on flights from Ontario to London:

    • Economy Class
    • Premium Economy Class
    • Business Class
    • First Class

    Prices vary by airline.

  • How long is a flight from Ontario to London?

    A nonstop flight from Ontario to London takes 00m, covering 5,416 miles.

  • Do I need a passport to fly from Ontario to London?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • How much should I expect to pay for a Ontario to London flight?

    Round-trip flights from Ontario to London range from $686 to $1,179, with an average of $893 over the past 12 months. Anything below $686 counts as a good deal.

  • How are flight prices from Ontario to London looking right now?

    One-way fares from Ontario to London are currently lower than usual. Average one-way flight prices are about $324, which is 48% below the typical average for this route.

  • What car rental options are available in London?

    Since London is served by multiple airports, car rental options and rates can vary depending on which one you fly into.
    Near London Heathrow Airport (LHR) — daily rates from around $7:

    • GREEN MOTION
    • DRIVALIA
    • Europcar
    • Alamo
    • Hertz

    Near London Gatwick Airport (LGW) — daily rates from around $7:

    • GREEN MOTION
    • DRIVALIA
    • U-Save
    • Europcar
    • Alamo

    Near London City Airport (LCY) — daily rates from around $10:

    • GREEN MOTION
    • Budget
    • Hertz
    • Avis
    • Sixt

    Near London Stansted Airport (STN) — daily rates from around $10:

    • GREEN MOTION
    • DRIVALIA
    • Europcar
    • Alamo
    • U-Save

    Near London Luton Airport (LTN) — daily rates from around $11:

    • GREEN MOTION
    • DRIVALIA
    • Alamo
    • Europcar
    • U-Save

  • Which airports can I use when flying from Ontario to London?

    Flights from Ontario to London usually depart from Ontario (ONT) and may arrive at several airports in London area, including London City (LCY), London Gatwick (LGW), London Heathrow (LHR), London Luton (LTN), London Southend (SEN) and London Stansted (STN).

  • Which airports do connecting flights from Ontario to London pass through?

    One-stop flights from Ontario to London most commonly connect through:

    • Dallas/Fort Worth (DFW) - 30% of one-stop connections
    • Seattle/Tacoma Intl (SEA) - 24% of one-stop connections
    • Denver Intl (DEN) - 22% of one-stop connections
    • Phoenix Sky Harbor Intl (PHX) - 14% of one-stop connections

  • Can I save money by using flexible dates for flights from Ontario to London?

    Yes. Flexible dates can save you up to 32% on flights from Ontario to London. Thursday is the cheapest departure day at $652 round-trip on average, while Wednesday is the most expensive at $956, a difference of $304.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from Ontario to London?

    Flying via Salt Lake City (SLC) gives the shortest average 1-stop total travel time at 13h 05m, compared with 13h 16m via Denver Intl (DEN) and 13h 28m via Phoenix Sky Harbor Intl (PHX).

  • What is the time difference between Ontario and London?

    London is 8 hours ahead of Ontario (British Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in London?

    Some of the most popular sights in London are Hyde Park and Buckingham Palace. These are among the most viewed places in London on KAYAK.

  • How can I get to the city center by public transport after my flight from Ontario to London?

    Upon arrival at London Heathrow Airport from Ontario, you can easily reach the city center using public transportation. Take the Heathrow Express train to Paddington Station, which operates every 15 minutes. From Paddington, you can transfer to the London Underground and take the Bakerloo Line or Circle Line to reach the city center.

  • Can I pre-book my seat on WestJet flights from Ontario to London?

    Yes, you can pre-book your seat on WestJet flights from Ontario to London. WestJet offers the option to select your preferred seat in advance, allowing you to secure your desired seating arrangement for a more comfortable journey. By accessing their online booking portal or contacting their customer service, you can make seat reservations according to your preferences and availability.

  • Which kid-friendly amenities does WestJet have on flights from Ontario to London?

    WestJet offers several kid-friendly amenities on flights from Ontario to London. These amenities include children's entertainment options such as movies, TV shows, and games suitable for different age groups. They also provide complimentary activity packs with coloring books, crayons, and puzzles to keep young travelers engaged during the flight.

  • What are the baggage restrictions when flying Virgin Atlantic from Ontario to London?

    The baggage restrictions when flying Virgin Atlantic from Ontario to London include a checked baggage allowance of two pieces weighing up to 50 lbs each in Economy class. Additionally, passengers are allowed one carry-on bag weighing up to 22 lbs and one personal item such as a laptop or handbag.

Your guide to booking Ontario to London flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Thursday departure and avoid flying on Wednesday. On this route, Thursday flights average $652, about $304 less than Wednesday fares (32% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Ontario to London trip for June. Fares historically average $530 round-trip in that month - typically $797 less than the most expensive month, which is July (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, hotels close to the airport you're flying into can be a convenient option.

    Near London City Airport

    • Good Hotel London
    • Aloft London Excel
    • Novotel London Excel

    Near London Heathrow Airport

    • Hilton London Heathrow Airport

    Near London Gatwick Airport

    • Premier Inn London Gatwick Airport
  • Common layover options for Air Canada flights from Ontario (ONT) to London (LON) may include stopovers in major hub cities such as Toronto, Montreal, or Ottawa. These layovers often provide convenient connections for passengers, allowing them to change planes and continue their journey to London.
  • Additionally, Air Canada offers a special food service called "Chef's Menu" on its flights from Ontario to London. Passengers can enjoy a delectable selection of culinary delights prepared by renowned chefs. The menu features a range of gourmet dishes using fresh, locally sourced ingredients, ensuring a delightful dining experience in the skies. From appetizers to main courses and desserts, Air Canada's Chef's Menu promises to satisfy the taste buds of travelers throughout their journey.
  • Air Canada offers a variety of in-flight entertainment options on its flights from Ontario to London. Passengers can enjoy a selection of movies, TV shows, and music, with a wide range of genres to choose from. Additionally, the airline provides personal screens with touch controls, offering a seamless and enjoyable viewing experience.
  • WestJet assists passengers with disabilities traveling from Ontario to London. They offer wheelchair assistance, accessible seating options, and priority boarding. Passengers can request special services such as mobility aids or medical equipment during their journey. WestJet's trained staff is available to ensure a comfortable and safe travel experience for passengers with disabilities, addressing their specific needs and providing necessary support throughout the journey.
  • You can change your seat when flying with WestJet from Ontario to London. Seat changes are subject to availability, and you can make the change either during the booking process or by accessing your reservation online. Alternatively, you can contact WestJet's customer service for assistance with seat changes.

More options for your flight from Ontario to London

Complete your trip to London with a hotel stay or car rental

Car rentals in London
Hotels in London
Vacations in London