ONT - LHR

$315 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
$551
Typical prices: $648-$1,054
Multiple Airlines
Fri 11/2Sun 11/11
ONT - LHR • 2 stops
Cheapest one-way
$315
Typical prices: $513-$688
JetBlue
Fri 10/19
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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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

Mon, Nov 2 - Wed, Nov 11
Multiple Airlines Logo
12:01 pm - 9:40 pmONT  Ontario-LHR London Heathrow
25h 39m2 stops San Francisco Kastrup Copenhagen
Multiple Airlines Logo
9:05 pm - 7:28 pmLHR  London Heathrow-ONT Ontario
30h 23m3 stops Stockholm Arlanda Kastrup Copenhagen San Francisco
$551Multiple Airlines
Thu, Nov 5 - Tue, Nov 10
Multiple Airlines Logo
12:01 pm - 6:30 pmONT  Ontario-LHR London Heathrow
22h 29m2 stops San Francisco Kastrup Copenhagen
Multiple Airlines Logo
6:40 am - 9:40 amLHR  London Heathrow-ONT Ontario
35h 00m3 stops Kastrup Copenhagen San Francisco Las Vegas Harry Reid Intl
$585Multiple Airlines
Wed, Nov 4 - Wed, Nov 11
Virgin Atlantic Logo
6:00 am - 7:05 amONT  Ontario-LHR London Heathrow
17h 05m2 stops Salt Lake City Minneapolis St Paul
Virgin Atlantic Logo
12:20 pm - 11:00 pmLHR  London Heathrow-ONT Ontario
18h 40m1 stop Seattle/Tacoma Intl
$722Virgin Atlantic
Sun, Oct 4 - Wed, Oct 14
Alaska Airlines Logo
6:02 am - 3:05 pmONT  Ontario-LHR London Heathrow
25h 03m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
5:00 pm - 10:17 amLHR  London Heathrow-ONT Ontario
25h 17m1 stop Seattle/Tacoma Intl
$724Alaska Airlines
Wed, Nov 4 - Wed, Nov 11
Virgin Atlantic Logo
1:35 pm - 10:00 amONT  Ontario-LHR London Heathrow
12h 25m1 stop Salt Lake City
Virgin Atlantic Logo
12:20 pm - 11:00 pmLHR  London Heathrow-ONT Ontario
18h 40m1 stop Seattle/Tacoma Intl
$725Virgin Atlantic
Sun, Oct 4 - Wed, Oct 14
Alaska Airlines Logo
6:02 am - 3:05 pmONT  Ontario-LHR London Heathrow
25h 03m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
5:00 pm - 1:16 pmLHR  London Heathrow-ONT Ontario
28h 16m1 stop Seattle/Tacoma Intl
$728Alaska Airlines
Mon, Oct 26 - Tue, Nov 3
Delta Logo
7:07 am - 7:50 amONT  Ontario-LHR London Heathrow
17h 43m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:30 am - 10:43 pmLHR  London Heathrow-ONT Ontario
24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$736Delta
Mon, Oct 26 - Tue, Nov 3
Delta Logo
12:16 pm - 9:00 amONT  Ontario-LHR London Heathrow
13h 44m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:30 am - 10:43 pmLHR  London Heathrow-ONT Ontario
24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$736Delta
Sun, Jan 17 - Wed, Jan 20
United Airlines Logo
6:00 am - 7:55 amONT  Ontario-LHR London Heathrow
41h 55m2 stops Houston George Bush Intcntl Chicago O'Hare Intl
United Airlines Logo
7:30 am - 8:20 pmLHR  London Heathrow-ONT Ontario
20h 50m2 stops Frankfurt am Main Denver Intl
$773United Airlines
Sun, Jan 17 - Wed, Jan 20
United Airlines Logo
6:53 pm - 11:15 amONT  Ontario-LHR London Heathrow
32h 22m1 stop San Francisco
United Airlines Logo
7:30 am - 8:20 pmLHR  London Heathrow-ONT Ontario
20h 50m2 stops Frankfurt am Main Denver Intl
$827United Airlines
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 from Ontario to London Heathrow Airport with more confidence.

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

Thursday is the cheapest day of the week to fly from Ontario to London Heathrow Airport, it is 18% cheaper than the average day. Sunday is the most expensive day with flight prices 17% higher than average. Based on deals found by KAYAK users in the last 12 months.

What is 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

$315
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly with an average 69% increase in price.
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 route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • 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 0h 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 $337, 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

    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 Ontario to London Heathrow Airport?

    Yes. Being flexible with your travel dates can save you up to 30% on the Ontario to London Heathrow Airport route. 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, Buckingham Palace and Trafalgar Square. 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 can be flexible, aim for a Thursday departure instead of Sunday. On this route, Thursday flights average $646 - about $276 less than Sunday (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