ONT - LHR

$315 Find Cheap Flights from Ontario to London Heathrow Airport - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$798
Typical prices: $648-$1,054
Alaska Airlines
Fri 3/2Tue 3/13
ONT - LHR • 1 stop
Cheapest one-way
$315
Typical prices: $513-$688
JetBlue
Wed 9/26
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

Tue, Mar 2 - Sat, Mar 13
Alaska Airlines Logo
12:00 pm - 12:20 pmONT  Ontario-LHR London Heathrow
16h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 10:39 pmLHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
$798Alaska Airlines
Tue, Dec 1 - Sat, Jan 9
Multiple Airlines Logo
6:00 am - 9:20 amONT  Ontario-LHR London Heathrow
19h 20m2 stops San Francisco Calgary
Multiple Airlines Logo
2:45 pm - 10:38 amLHR  London Heathrow-ONT Ontario
27h 53m1 stop Seattle/Tacoma Intl
$802Multiple Airlines
Mon, Mar 1 - Mon, Mar 8
Multiple Airlines Logo
6:00 am - 7:10 amONT  Ontario-LHR London Heathrow
17h 10m2 stops San Francisco Montreal Pierre Elliott Trudeau Intl
Multiple Airlines Logo
2:45 pm - 10:39 pmLHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
$802Multiple Airlines
Mon, Feb 1 - Mon, Feb 8
Alaska Airlines Logo
7:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
21h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 10:41 pmLHR  London Heathrow-ONT Ontario
15h 56m1 stop Seattle/Tacoma Intl
$807Alaska Airlines
Sun, Jan 24 - Sat, Jan 30
British Airways Logo
2:17 pm - 12:15 pmONT  Ontario-LHR London Heathrow
13h 58m1 stop Dallas/Fort Worth
British Airways Logo
2:35 pm - 9:59 pmLHR  London Heathrow-ONT Ontario
15h 24m1 stop Phoenix Sky Harbor Intl
$847British Airways
Tue, Dec 8 - Sun, Dec 27
British Airways Logo
2:22 pm - 12:00 pmONT  Ontario-LHR London Heathrow
13h 38m1 stop Dallas/Fort Worth
British Airways Logo
2:45 pm - 10:02 pmLHR  London Heathrow-ONT Ontario
15h 17m1 stop Dallas/Fort Worth
$850British Airways
Wed, Dec 2 - Wed, Dec 16
Delta Logo
6:00 am - 11:40 amONT  Ontario-LHR London Heathrow
21h 40m2 stops Salt Lake City Atlanta Hartsfield-Jackson
Delta Logo
8:55 am - 10:59 pmLHR  London Heathrow-ONT Ontario
22h 04m2 stops Paris Charles de Gaulle Seattle/Tacoma Intl
$879Delta
Mon, Oct 26 - Tue, Nov 3
Delta Logo
11:56 am - 10:40 amONT  Ontario-LHR London Heathrow
15h 44m1 stop Seattle/Tacoma Intl
Delta Logo
6:30 am - 5:12 pmLHR  London Heathrow-ONT Ontario
18h 42m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$907Delta
Tue, Mar 2 - Fri, Mar 5
United Airlines Logo
1:33 pm - 11:15 amONT  Ontario-LHR London Heathrow
13h 42m1 stop San Francisco
United Airlines Logo
10:25 am - 11:06 pmLHR  London Heathrow-ONT Ontario
20h 41m2 stops Chicago O'Hare Intl San Francisco
$910United Airlines
Tue, Mar 2 - Fri, Mar 5
United Airlines Logo
1:33 pm - 11:15 amONT  Ontario-LHR London Heathrow
13h 42m1 stop San Francisco
United Airlines Logo
10:25 am - 11:06 pmLHR  London Heathrow-ONT Ontario
20h 41m2 stops Chicago O'Hare Intl San Francisco
$911United 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.

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

Round-trip flights from Ontario to London Heathrow Airport start at $798. Prices are typical for this route right now, with typical round-trip fares ranging from $648 to $1,054. The lowest price found in the past 5 days was $798 on Alaska Airlines.

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.

  • 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).

  • 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

  • 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.

  • What popular places can I visit in London Heathrow Airport?

    Some of the most popular sights in London Heathrow Airport are Paddington Station, Central London and London Victoria Station. These are among the most viewed places in London Heathrow Airport on KAYAK.

  • 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 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 $342, which is 46% below the typical average for this route.

  • 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 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

  • 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.

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

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Hotels in London
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