ONT - LHR

$326 Find Cheap Flights from Ontario to London Heathrow Airport - Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$653
Typical prices: $648-$1,054
Multiple Airlines
Sat 11/10Sat 11/17
ONT - LHR • 2 stops
Cheapest one-way
$319
Typical prices: $513-$688
British Airways
Fri 1/12
ONT - LHR • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Ontario and London Heathrow Airport. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
June
Cheapest • 33% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Atlanta Hartsfield-Jackson (ATL)
Cheapest • Avg $580 (round-trip)
Salt Lake City (SLC)
Shortest trip • 13h 06m (one-way)
Insights
Insights
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We hope you love your trip to London Heathrow Airport!
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Booking Insights
Flight Deals

Cheap Flights from Ontario to London (ONT-LHR)

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

Recent round-trip flight deals from Ontario to London

Tue, Nov 10 - Tue, Nov 17
Multiple Airlines Logo
6:25 am - 7:30 pmONT  Ontario-LHR London Heathrow
29h 05m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
12:15 pm - 11:51 pmLHR  London Heathrow-ONT Ontario
19h 36m2 stops Reykjavik Keflavik Intl Denver Intl
$653Multiple Airlines
Tue, Nov 10 - Tue, Nov 17
Multiple Airlines Logo
6:25 am - 10:50 amONT  Ontario-LHR London Heathrow
20h 25m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
12:15 pm - 11:51 pmLHR  London Heathrow-ONT Ontario
19h 36m2 stops Reykjavik Keflavik Intl Denver Intl
$654Multiple Airlines
Tue, Oct 20 - Tue, Oct 27
Virgin Atlantic Logo
1:35 pm - 11:00 amONT  Ontario-LHR London Heathrow
13h 25m1 stop Salt Lake City
Virgin Atlantic Logo
12:20 pm - 10:43 pmLHR  London Heathrow-ONT Ontario
17h 23m1 stop Seattle/Tacoma Intl
$725Virgin Atlantic
Mon, Oct 19 - Tue, Oct 27
Virgin Atlantic Logo
6:00 pm - 3:35 pmONT  Ontario-LHR London Heathrow
13h 35m1 stop Seattle/Tacoma Intl
Virgin Atlantic Logo
12:20 pm - 10:43 pmLHR  London Heathrow-ONT Ontario
17h 23m1 stop Seattle/Tacoma Intl
$734Virgin Atlantic
Mon, Oct 26 - Tue, Nov 3
Delta Logo
6:20 am - 10:40 amONT  Ontario-LHR London Heathrow
21h 20m1 stop Seattle/Tacoma Intl
Delta Logo
6:20 am - 10:43 pmLHR  London Heathrow-ONT Ontario
24h 23m2 stops Paris Charles de Gaulle Seattle/Tacoma Intl
$737Delta
Wed, Nov 4 - Thu, Nov 12
Delta Logo
7:07 am - 6:25 amONT  Ontario-LHR London Heathrow
15h 18m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:30 am - 6:34 pmLHR  London Heathrow-ONT Ontario
20h 04m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
$737Delta
Tue, Oct 27 - Tue, Nov 24
Alaska Airlines Logo
2:13 pm - 12:20 pmONT  Ontario-LHR London Heathrow
15h 07m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 11:31 pmLHR  London Heathrow-ONT Ontario
16h 46m1 stop Seattle/Tacoma Intl
$743Alaska Airlines
Tue, Oct 27 - Wed, Nov 25
Alaska Airlines Logo
11:13 am - 12:20 pmONT  Ontario-LHR London Heathrow
18h 07m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 11:31 pmLHR  London Heathrow-ONT Ontario
16h 46m1 stop Seattle/Tacoma Intl
$743Alaska Airlines
Wed, Mar 17 - Wed, Mar 31
British Airways Logo
5:02 pm - 1:35 pmONT  Ontario-LHR London Heathrow
13h 33m1 stop Phoenix Sky Harbor Intl
British Airways Logo
2:25 pm - 9:28 pmLHR  London Heathrow-ONT Ontario
15h 03m1 stop Dallas/Fort Worth
$842British Airways
Wed, Mar 17 - Wed, Mar 31
British Airways Logo
5:02 pm - 1:35 pmONT  Ontario-LHR London Heathrow
13h 33m1 stop Phoenix Sky Harbor Intl
British Airways Logo
2:25 pm - 9:28 pmLHR  London Heathrow-ONT Ontario
15h 03m1 stop Dallas/Fort Worth
$842British Airways
Booking Insights

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

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

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

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 Heathrow Airport. It’s 18% cheaper than the average day, while Sunday is the most expensive, with prices 17% higher.

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

•June is the cheapest month to fly from Ontario to London Heathrow Airport 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 Heathrow Airport flights

Low season

February

Cheapest flight

$319
Beat the crowds with an average 87% drop in travelers.
The most popular month to fly with an average 67% 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 Heathrow Airport 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 Heathrow Airport?

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

    • Economy Class
    • Premium Economy Class
    • First Class

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

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

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

    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 Heathrow Airport flight?

    Round-trip flights from Ontario to London Heathrow Airport range from $648 to $1,054, with an average of $786 over the past 12 months. Anything below $648 counts as a good deal.

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

    One-way fares from Ontario to London Heathrow Airport are currently lower than usual. Average one-way flight prices are about $340, which is 47% below the typical average for this route.

  • What car rental options are available at London Heathrow Airport (LHR)?

    London Heathrow Airport (LHR) hosts 5 major car rental companies, with daily rates starting from around $7 for economy cars. Top options include:

    • GREEN MOTION
    • DRIVALIA
    • Europcar
    • Alamo
    • Hertz

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

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

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

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

    • Dallas/Fort Worth (DFW) - 30% of one-stop connections
    • Denver Intl (DEN) - 21% of one-stop connections
    • Seattle/Tacoma Intl (SEA) - 20% of one-stop connections
    • Phoenix Sky Harbor Intl (PHX) - 15% of one-stop connections

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

    Yes. Flexible dates can save you up to 30% on flights from Ontario to London Heathrow Airport. Thursday is the cheapest departure day at $646 round-trip on average, while Sunday is the most expensive at $922, a difference of $276.

    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 Heathrow Airport?

    Flying via Salt Lake City (SLC) gives the shortest average 1-stop total travel time at 13h 06m, compared with 13h 14m via Denver Intl (DEN) and 13h 31m via Phoenix Sky Harbor Intl (PHX).

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

    London Heathrow Airport 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 Heathrow Airport?

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

Your guide to booking Ontario to London Heathrow Airport 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 Sunday. On this route, Thursday flights average $646, about $276 less than Sunday fares (30% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Ontario to London Heathrow Airport 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, check out these hotels close to London Heathrow Airport.

    • Hilton London Heathrow Airport

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