ONT - LHR

$320 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
$800
Typical prices: $648-$1,054
Alaska Airlines
Sat 1/20Thu 1/25
ONT - LHR • 1 stop
Cheapest one-way
$320
Typical prices: $513-$688
British Airways
Sat 1/20
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 03m (one-way)
Insights
Insights
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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

Wed, Jan 20 - Mon, Jan 25
Alaska Airlines Logo
11:36 am - 12:20 pmONT  Ontario-LHR London Heathrow
16h 44m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 10:38 amLHR  London Heathrow-ONT Ontario
27h 53m1 stop Seattle/Tacoma Intl
$800Alaska Airlines
Wed, Jan 13 - Sun, Jan 17
Alaska Airlines Logo
11:36 am - 12:20 pmONT  Ontario-LHR London Heathrow
16h 44m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 10:41 pmLHR  London Heathrow-ONT Ontario
15h 56m1 stop Seattle/Tacoma Intl
$803Alaska Airlines
Tue, Jan 26 - Sun, Jan 31
Multiple Airlines Logo
2:22 pm - 12:00 pmONT  Ontario-LHR London Heathrow
13h 38m1 stop Dallas/Fort Worth
Multiple Airlines Logo
2:45 pm - 10:41 pmLHR  London Heathrow-ONT Ontario
15h 56m1 stop Seattle/Tacoma Intl
$808Multiple Airlines
Tue, Oct 6 - Fri, Oct 16
Multiple Airlines Logo
10:42 pm - 8:45 pmONT  Ontario-LHR London Heathrow
14h 03m1 stop New York John F Kennedy Intl
Multiple Airlines Logo
5:00 pm - 11:42 pmLHR  London Heathrow-ONT Ontario
14h 42m1 stop Seattle/Tacoma Intl
$808Multiple Airlines
Wed, Dec 2 - Sun, Dec 6
British Airways Logo
12:42 pm - 10:00 amONT  Ontario-LHR London Heathrow
13h 18m1 stop Dallas/Fort Worth
British Airways Logo
1:50 pm - 9:32 pmLHR  London Heathrow-ONT Ontario
15h 42m1 stop Dallas/Fort Worth
$837British Airways
Tue, Dec 1 - Tue, Dec 15
British Airways Logo
12:45 pm - 10:25 amONT  Ontario-LHR London Heathrow
13h 40m1 stop Dallas/Fort Worth
British Airways Logo
2:10 pm - 10:12 pmLHR  London Heathrow-ONT Ontario
16h 02m1 stop Charlotte Douglas
$841British Airways
Tue, Dec 1 - Wed, Dec 16
Delta Logo
6:00 am - 7:05 amONT  Ontario-LHR London Heathrow
17h 05m2 stops Salt Lake City Minneapolis St Paul
Delta Logo
8:55 am - 10:59 pmLHR  London Heathrow-ONT Ontario
22h 04m2 stops Paris Charles de Gaulle Seattle/Tacoma Intl
$881Delta
Mon, Nov 23 - Fri, Nov 27
Delta Logo
1:25 pm - 10:00 amONT  Ontario-LHR London Heathrow
12h 35m1 stop Salt Lake City
Delta Logo
8:55 am - 7:41 pmLHR  London Heathrow-ONT Ontario
18h 46m1 stop Atlanta Hartsfield-Jackson
$897Delta
Sun, Nov 29 - Fri, Dec 4
United Airlines Logo
1:35 pm - 11:15 amONT  Ontario-LHR London Heathrow
13h 40m1 stop San Francisco
United Airlines Logo
10:05 am - 5:36 pmLHR  London Heathrow-ONT Ontario
15h 31m1 stop San Francisco
$898United Airlines
Sun, Nov 29 - Thu, Dec 10
United Airlines Logo
1:35 pm - 11:15 amONT  Ontario-LHR London Heathrow
13h 40m1 stop San Francisco
United Airlines Logo
1:45 pm - 8:29 pmLHR  London Heathrow-ONT Ontario
14h 44m1 stop San Francisco
$898United 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 $800. 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 $800 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

$320
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) - 25% of one-stop connections
    • Seattle/Tacoma Intl (SEA) - 20% of one-stop connections
    • Denver Intl (DEN) - 18% of one-stop connections
    • Phoenix Sky Harbor Intl (PHX) - 16% 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 $328, which is 49% 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 03m, compared with 13h 21m via Denver Intl (DEN) and 13h 25m 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

Everything you need to know for your flight from Ontario to London

Information on your arrival and departure airports

Ontario (ONT)
Heathrow (LHR)