LHR - ONT

$470 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
$511
Typical prices: $642-$833
United Airlines
Sat 11/24Sun 12/9
LHR - ONT • 2 stops
Cheapest one-way
$470
Typical prices: $607-$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
Phoenix Sky Harbor Intl (PHX)
Cheapest • Avg $695 (round-trip)
Denver Intl (DEN)
Shortest trip • 13h 27m (one-way)
Insights
Insights
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Flight Deals

Cheap Flights from London to Ontario (LHR-ONT)

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

Recent round-trip flight deals from London to Ontario

Tue, Nov 24 - Wed, Dec 9
United Airlines Logo
9:00 am - 8:15 pmLHR  London Heathrow-ONT Ontario
19h 15m2 stops Zurich San Francisco
United Airlines Logo
1:40 pm - 9:40 amONT  Ontario-LHR London Heathrow
12h 00m1 stop Denver Intl
$511United Airlines
Wed, Nov 11 - Wed, Nov 18
United Airlines Logo
9:00 am - 8:15 pmLHR  London Heathrow-ONT Ontario
19h 15m2 stops Zurich San Francisco
United Airlines Logo
6:00 am - 7:40 amONT  Ontario-LHR London Heathrow
17h 40m1 stop Houston George Bush Intcntl
$511United Airlines
Mon, Oct 12 - Mon, Oct 19
United Airlines Logo
7:25 am - 10:49 pmLHR  London Heathrow-ONT Ontario
23h 24m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
United Airlines Logo
1:52 pm - 11:10 amONT  Ontario-LHR London Heathrow
13h 18m1 stop San Francisco
$516United Airlines
Tue, Oct 13 - Tue, Dec 8
United Airlines Logo
7:25 am - 5:41 pmLHR  London Heathrow-ONT Ontario
18h 16m2 stops Munich Franz Josef Strauss San Francisco
United Airlines Logo
1:40 pm - 9:40 amONT  Ontario-LHR London Heathrow
12h 00m1 stop Denver Intl
$516United Airlines
Mon, Oct 26 - Mon, Nov 2
United Airlines Logo
9:30 am - 8:15 pmLHR  London Heathrow-ONT Ontario
17h 45m2 stops Frankfurt am Main San Francisco
United Airlines Logo
1:29 pm - 7:40 amONT  Ontario-LHR London Heathrow
34h 11m2 stops Denver Intl Houston George Bush Intcntl
$517United Airlines
Wed, Nov 18 - Wed, Nov 25
United Airlines Logo
9:30 am - 8:15 pmLHR  London Heathrow-ONT Ontario
18h 45m2 stops Frankfurt am Main San Francisco
United Airlines Logo
1:29 pm - 9:40 amONT  Ontario-LHR London Heathrow
12h 11m1 stop Denver Intl
$517United Airlines
Thu, Oct 29 - Thu, Nov 5
United Airlines Logo
9:30 am - 8:51 pmLHR  London Heathrow-ONT Ontario
18h 21m2 stops Frankfurt am Main Denver Intl
United Airlines Logo
5:00 am - 9:40 amONT  Ontario-LHR London Heathrow
20h 40m1 stop Denver Intl
$517United Airlines
Tue, Oct 27 - Tue, Nov 3
United Airlines Logo
9:30 am - 8:15 pmLHR  London Heathrow-ONT Ontario
17h 45m2 stops Frankfurt am Main San Francisco
United Airlines Logo
6:00 am - 7:40 amONT  Ontario-LHR London Heathrow
17h 40m1 stop Houston George Bush Intcntl
$517United Airlines
Mon, Nov 2 - Sun, Nov 15
British Airways Logo
1:50 pm - 9:32 pmLHR  London Heathrow-ONT Ontario
15h 42m1 stop Dallas/Fort Worth
British Airways Logo
4:25 pm - 1:35 pmONT  Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
$643British Airways
Sun, Dec 6 - Sun, Jan 17
British Airways Logo
2:35 pm - 9:53 pmLHR  London Heathrow-ONT Ontario
15h 18m1 stop Phoenix Sky Harbor Intl
British Airways Logo
4:25 pm - 1:35 pmONT  Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
$644British Airways
Booking Insights

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 from London Heathrow Airport to Ontario 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 start at $511. Prices are below average for this route right now, with typical round-trip fares ranging from $642 to $833. The lowest price found in the past 5 days was $511 on United Airlines.

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

Saturday is the cheapest day of the week to fly from London Heathrow Airport to Ontario, it is 13% cheaper than the average day. Sunday is the most expensive day with flight prices 25% higher than average. Based on deals found by KAYAK users in the last 12 months.

What is 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 ($888) 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

October

Cheapest flight

$470
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly with an average 25% increase in price.
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 route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • 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).

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

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

    • Economy Class
    • Premium Economy Class
    • First Class

  • 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) - 34% of one-stop connections
    • Salt Lake City (SLC) - 16% of one-stop connections
    • Seattle/Tacoma Intl (SEA) - 15% of one-stop connections
    • Denver Intl (DEN) - 14% of one-stop connections

    Dallas/Fort Worth (DFW) handles the largest share of one-stop connections on this route.

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

    On the London Heathrow Airport to Ontario route, being flexible with your departure day can save you up to 31%. Saturday is the cheapest day at $618 round-trip on average, while Sunday is the most expensive at $893: a $275 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

  • What popular places can I visit in Ontario?

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

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

    A nonstop flight from London Heathrow Airport to Ontario takes 0h 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 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 $475, which is 32% below the typical average for this route.

  • 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 27m, compared with 14h 12m via Phoenix Sky Harbor Intl (PHX) and 14h 28m 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 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

  • 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 $642 to $833, with an average of $710 over the past 12 months. Anything below $642 counts as a good deal.

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 can be flexible, aim for a Saturday departure instead of Sunday. On this route, Saturday flights average $618 - about $275 less than Sunday (31% 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
    - 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