LON - ONT

$468 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: $630-$832
Alaska Airlines
Thu 11/22Sat 12/8
LHR - ONT • 1 stop
Cheapest one-way
$468
Typical prices: $584-$867
Alaska Airlines
Sun 3/4
LHR - ONT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between London 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
Atlanta Hartsfield-Jackson (ATL)
Cheapest • Avg $635 (round-trip)
Denver Intl (DEN)
Shortest trip • 13h 26m (one-way)
Insights
Insights
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Flight Deals

Cheap Flights from London to Ontario (LON-ONT)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from London to Ontario

Sun, Nov 22 - Tue, Dec 8
Alaska Airlines Logo
2:45 pm - 11:31 pmLHR  London Heathrow-ONT Ontario
16h 46m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
11:57 am - 12:20 pmONT  Ontario-LHR London Heathrow
16h 23m1 stop Seattle/Tacoma Intl
$554Alaska Airlines
Thu, Dec 10 - Wed, Dec 23
Alaska Airlines Logo
2:45 pm - 10:59 pmLHR  London Heathrow-ONT Ontario
16h 14m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
8:59 pm - 12:20 pmONT  Ontario-LHR London Heathrow
31h 21m1 stop Seattle/Tacoma Intl
$555Alaska Airlines
Mon, Feb 8 - Sun, Feb 14
Alaska Airlines Logo
2:45 pm - 10:38 amLHR  London Heathrow-ONT Ontario
27h 53m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
12:00 pm - 12:20 pmONT  Ontario-LHR London Heathrow
16h 20m1 stop Seattle/Tacoma Intl
$563Alaska Airlines
Mon, Nov 23 - Tue, Dec 8
Alaska Airlines Logo
2:45 pm - 11:31 pmLHR  London Heathrow-ONT Ontario
16h 46m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
11:57 am - 12:20 pmONT  Ontario-LHR London Heathrow
16h 23m1 stop Seattle/Tacoma Intl
$565Alaska Airlines
Sun, Nov 22 - Tue, Dec 8
Alaska Airlines Logo
2:45 pm - 11:31 pmLHR  London Heathrow-ONT Ontario
16h 46m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
11:57 am - 12:20 pmONT  Ontario-LHR London Heathrow
16h 23m1 stop Seattle/Tacoma Intl
$566Alaska Airlines
Mon, Dec 7 - Wed, Dec 23
Alaska Airlines Logo
2:45 pm - 10:59 pmLHR  London Heathrow-ONT Ontario
16h 14m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
8:59 pm - 12:20 pmONT  Ontario-LHR London Heathrow
31h 21m1 stop Seattle/Tacoma Intl
$567Alaska Airlines
Mon, Dec 7 - Wed, Dec 23
Alaska Airlines Logo
2:45 pm - 10:59 pmLHR  London Heathrow-ONT Ontario
16h 14m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
8:59 pm - 12:20 pmONT  Ontario-LHR London Heathrow
31h 21m1 stop Seattle/Tacoma Intl
$568Alaska Airlines
Fri, Nov 20 - Sun, Nov 22
Alaska Airlines Logo
2:45 pm - 11:31 pmLHR  London Heathrow-ONT Ontario
16h 46m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
6:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
$570Alaska Airlines
Fri, Dec 4 - Mon, Dec 7
Alaska Airlines Logo
2:45 pm - 10:59 pmLHR  London Heathrow-ONT Ontario
16h 14m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
11:57 am - 12:20 pmONT  Ontario-LHR London Heathrow
16h 23m1 stop Seattle/Tacoma Intl
$571Alaska Airlines
Mon, Dec 7 - Wed, Dec 23
Alaska Airlines Logo
2:45 pm - 10:59 pmLHR  London Heathrow-ONT Ontario
16h 14m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
8:59 pm - 12:20 pmONT  Ontario-LHR London Heathrow
31h 21m1 stop Seattle/Tacoma Intl
$572Alaska Airlines
Booking Insights

Price, demand and travel trends for London 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 to Ontario?

Round-trip flights from London to Ontario typically range from $630 to $832. The lowest price found in the past 5 days was $554, on Alaska Airlines.

What is the cheapest London to Ontario flight route?

There's little price difference between London to Ontario routes. They average around $707 round-trip, based on KAYAK data over the past 12 months.

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

Based on deals KAYAK users found in the last 12 months, Friday is the cheapest day of the week to fly from London to Ontario. It’s 17% cheaper than the average day, while Sunday is the most expensive, with prices 28% higher.

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

•January is the cheapest month to fly from London to Ontario at $553 round-trip.
•June ($905) and May ($805) 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 to Ontario flights

Low season

October

Cheapest flight

$468
Beat the crowds with an average 59% drop in travelers.
The most popular month to fly with an average 75% 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 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 to Ontario?

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

    • Economy Class
    • Premium Economy Class
    • Business Class

  • How long is a flight from London to Ontario?

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

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

    Round-trip flights from London to Ontario range from $630 to $832, with an average of $707 over the past 12 months. Anything below $630 counts as a good deal.

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

    One-way fares from London to Ontario are currently lower than usual. Average one-way flight prices are about $478, which is 29% 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 averaging $60 for economy cars. Top options include:

    • Fox
    • Europcar
    • Thrifty
    • Alamo
    • Dollar

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

    Flights from London to Ontario may depart from 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). Flights usually arrive at Ontario (ONT).

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

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

    • Seattle/Tacoma Intl (SEA) - 29% of one-stop connections
    • Dallas/Fort Worth (DFW) - 26% of one-stop connections
    • Denver Intl (DEN) - 14% of one-stop connections
    • Salt Lake City (SLC) - 13% of one-stop connections

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

    Yes. Flexible dates can save you up to 36% on flights from London to Ontario. Friday is the cheapest departure day at $589 round-trip on average, while Sunday is the most expensive at $909, a difference of $320.

    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 London 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 and Ontario?

    Ontario is 8 hours behind London (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 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 Friday departure and avoid flying on Sunday. On this route, Friday flights average $589, about $320 less than Sunday fares (35% savings) based on the last 12 months.
  • If you can choose when to travel, plan your London 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.

    • Ontario Airport Inn
    • Azure Hotel & Suites, Trademark Collection by Wyndham
    • Holiday Inn Ontario Airport By IHG

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