United States
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LHR - ONT

$462 Find Cheap Flights from London to Ontario - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$554
Typical prices: $639-$831
Alaska Airlines
Tue 11/6Tue 11/13
LHR - ONT • 1 stop
Cheapest one-way
$460
Typical prices: $587-$875
Alaska Airlines
Sat 12/1
LHR - ONT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between London Heathrow Airport and Ontario. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
January
Cheapest • 22% price drop
May
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Seattle/Tacoma Intl (SEA)
Cheapest • Avg $689 (round-trip)
Denver Intl (DEN)
Shortest trip • 13h 26m (one-way)
Insights
Insights
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We hope you love your trip to Ontario!

Cheap Flights from London to Ontario (LHR-ONT)

 

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

Mon, Nov 2 - Fri, Nov 13
Alaska Airlines Logo
2:45 pm - 11:06 pmLHR  London Heathrow-ONT Ontario
16h 21m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
12:02 pm - 12:20 pmONT  Ontario-LHR London Heathrow
16h 18m1 stop Seattle/Tacoma Intl
$556Alaska Airlines
Fri, Nov 6 - Sun, Nov 22
Alaska Airlines Logo
2:45 pm - 11:06 pmLHR  London Heathrow-ONT Ontario
16h 21m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
11:55 am - 12:20 pmONT  Ontario-LHR London Heathrow
16h 25m1 stop Seattle/Tacoma Intl
$557Alaska Airlines
Tue, Nov 17 - Tue, Nov 24
Alaska Airlines Logo
2:45 pm - 11:18 amLHR  London Heathrow-ONT Ontario
28h 33m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
6:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
$560Alaska Airlines
Wed, Oct 28 - Wed, Nov 11
Alaska Airlines Logo
2:45 pm - 10:17 amLHR  London Heathrow-ONT Ontario
26h 32m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
6:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
$561Alaska Airlines
Thu, Oct 29 - Tue, Nov 3
Alaska Airlines Logo
2:45 pm - 11:42 pmLHR  London Heathrow-ONT Ontario
15h 57m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
12:02 pm - 12:20 pmONT  Ontario-LHR London Heathrow
16h 18m1 stop Seattle/Tacoma Intl
$562Alaska Airlines
Mon, Jan 11 - Sat, Jan 16
Alaska Airlines Logo
2:45 pm - 10:38 amLHR  London Heathrow-ONT Ontario
27h 53m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
7:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
21h 20m1 stop Seattle/Tacoma Intl
$565Alaska Airlines
Tue, Jan 12 - Sun, Jan 17
Alaska Airlines Logo
2:45 pm - 10:41 pmLHR  London Heathrow-ONT Ontario
15h 56m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
7:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
21h 20m1 stop Seattle/Tacoma Intl
$566Alaska Airlines
Thu, Oct 22 - Mon, Oct 26
Alaska Airlines Logo
5:00 pm - 10:17 amLHR  London Heathrow-ONT Ontario
25h 17m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
6:02 am - 12:20 pmONT  Ontario-LHR London Heathrow
23h 18m1 stop Seattle/Tacoma Intl
$567Alaska Airlines
Sun, Nov 1 - Sat, Nov 14
Alaska Airlines Logo
2:45 pm - 11:06 pmLHR  London Heathrow-ONT Ontario
16h 21m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
12:02 pm - 12:20 pmONT  Ontario-LHR London Heathrow
16h 18m1 stop Seattle/Tacoma Intl
$568Alaska Airlines
Mon, Oct 19 - Tue, Oct 27
Alaska Airlines Logo
5:00 pm - 11:42 pmLHR  London Heathrow-ONT Ontario
14h 42m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
11:13 am - 12:20 pmONT  Ontario-LHR London Heathrow
18h 07m1 stop Seattle/Tacoma Intl
$569Alaska Airlines

Price, demand and travel trends for London Heathrow Airport to Ontario flights

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

How much is a round-trip flight from London Heathrow Airport to Ontario?

Round-trip flights from London Heathrow Airport to Ontario typically range from $639 to $831. The lowest price found in the past 5 days was $554, on Alaska Airlines.

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

Based on deals KAYAK users found in the last 12 months, Saturday is the cheapest day of the week to fly from London Heathrow Airport to Ontario. It’s 7% cheaper than the average day, while Sunday is the most expensive, with prices 26% higher.

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

•January is the cheapest month to fly from London Heathrow Airport to Ontario at $553 round-trip.
•June ($905) and May ($825) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 63% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

Key details for London Heathrow Airport to Ontario flights

Low season

February

Cheapest flight

$460
Beat the crowds with an average 60% drop in travelers.
The most popular month to fly with an average 11% increase in travelers.
One-way flight from London Heathrow Airport to Ontario

When to book flights from London to Ontario

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

Your London Heathrow Airport to Ontario 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 London Heathrow Airport to Ontario?

    Two cabin classes are available on flights from London Heathrow Airport to Ontario:

    • Economy Class
    • Premium Economy Class

  • How long is a flight from London Heathrow Airport to Ontario?

    A nonstop flight from London Heathrow Airport to Ontario takes 00m, covering 5,407 miles.

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

    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 London Heathrow Airport to Ontario flight?

    Round-trip flights from London Heathrow Airport to Ontario range from $639 to $831, with an average of $708 over the past 12 months. Anything below $639 counts as a good deal.

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

    One-way fares from London Heathrow Airport to Ontario are currently lower than usual. Average one-way flight prices are about $467, which is 33% below the typical average for this route.

  • What car rental options are available at Ontario Airport (ONT)?

    Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates starting from around $18 for economy cars. Top options include:

    • Fox
    • Thrifty
    • Europcar
    • Dollar
    • Alamo

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

    Flights from London Heathrow Airport to Ontario usually depart from London Heathrow (LHR) and arrive at Ontario (ONT).

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

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

    • Dallas/Fort Worth (DFW) - 30% of one-stop connections
    • Seattle/Tacoma Intl (SEA) - 25% of one-stop connections
    • Denver Intl (DEN) - 14% of one-stop connections
    • Salt Lake City (SLC) - 14% of one-stop connections

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

    Yes. Flexible dates can save you up to 26% on flights from London Heathrow Airport to Ontario. Saturday is the cheapest departure day at $665 round-trip on average, while Sunday is the most expensive at $893, a difference of $228.

    Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

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

    Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time at 13h 26m, compared with 14h 18m via Phoenix Sky Harbor Intl (PHX) and 15h 13m via San Francisco (SFO).

  • What is the time difference between London Heathrow Airport and Ontario?

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

  • What popular places can I visit in Ontario?

    Some of the most popular sights in Ontario are Ontario Convention Center and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

Your guide to booking London Heathrow Airport to Ontario 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 Saturday departure and avoid flying on Sunday. On this route, Saturday flights average $665, about $228 less than Sunday fares (26% savings) based on the last 12 months.
  • If you can choose when to travel, plan your London Heathrow Airport to Ontario trip for January. Fares historically average $553 round-trip in that month - typically $352 less than the most expensive month, which is June (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ontario Airport.

    • Azure Hotel & Suites, Trademark Collection by Wyndham
    • La Quinta Inn & Suites by Wyndham Ontario Airport
    • Ontario Airport Inn

More options for your flight from London to Ontario

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

Car rentals in Ontario
Hotels in Ontario
Vacations in Ontario