ONT - LHR

$310 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
$620
Typical prices: $686-$1,179
Multiple Airlines
Fri 11/16Fri 11/23
ONT - LHR • 2 stops
Cheapest one-way
$310
Typical prices: $482-$688
Virgin Atlantic
Wed 2/14
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 • 41% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Phoenix Sky Harbor Intl (PHX)
Cheapest • Avg $916 (round-trip)
Salt Lake City (SLC)
Shortest trip • 13h 05m (one-way)
Insights
Insights
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We hope you love your trip to London Heathrow Airport!

Cheap Flights from Ontario to London (ONT-LHR)

 

Cheap flights from Ontario to London with top airlines, updated regularly. Compare round-trip, one-way, direct and last-minute deals.

Mon, Nov 16 - Mon, Nov 23
Multiple Airlines Logo
12:01 pm - 4:00 pmONT  Ontario-LHR London Heathrow
19h 59m2 stops San Francisco Kastrup Copenhagen
Multiple Airlines Logo
6:40 am - 8:30 amLHR  London Heathrow-ONT Ontario
33h 50m3 stops Kastrup Copenhagen San Francisco Las Vegas Harry Reid Intl
$620Multiple Airlines
Mon, Nov 16 - Sat, Nov 21
Multiple Airlines Logo
12:01 pm - 4:00 pmONT  Ontario-LHR London Heathrow
19h 59m2 stops San Francisco Kastrup Copenhagen
Multiple Airlines Logo
6:40 am - 12:24 amLHR  London Heathrow-ONT Ontario
25h 44m2 stops Kastrup Copenhagen San Francisco
$623Multiple Airlines
Tue, Mar 2 - Fri, Mar 5
United Airlines Logo
6:35 pm - 7:25 amONT  Ontario-LHR London Heathrow
28h 50m1 stop San Francisco
United Airlines Logo
6:50 am - 6:44 pmLHR  London Heathrow-ONT Ontario
19h 54m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
$751United Airlines
Sun, Jan 10 - Tue, Jan 12
United Airlines Logo
1:42 pm - 8:35 pmONT  Ontario-LHR London Heathrow
22h 53m2 stops Denver Intl Newark
United Airlines Logo
5:30 pm - 8:01 pmLHR  London Heathrow-ONT Ontario
34h 31m2 stops Frankfurt am Main San Francisco
$762United Airlines
Mon, Mar 1 - Sun, Mar 7
Alaska Airlines Logo
6:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
22h 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
Mon, Mar 1 - Sat, Mar 6
Alaska Airlines Logo
6:00 am - 12:20 pmONT  Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
2:45 pm - 10:39 pmLHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
$802Alaska Airlines
Sun, Jan 10 - Wed, Jan 13
Delta Logo
7:00 am - 6:25 amONT  Ontario-LHR London Heathrow
15h 25m1 stop Atlanta Hartsfield-Jackson
Delta Logo
11:45 am - 4:12 pmLHR  London Heathrow-ONT Ontario
36h 27m2 stops Amsterdam Schiphol Salt Lake City
$874Delta
Sun, Jan 10 - Tue, Jan 12
Delta Logo
7:00 am - 6:25 amONT  Ontario-LHR London Heathrow
15h 25m1 stop Atlanta Hartsfield-Jackson
Delta Logo
11:45 am - 4:12 pmLHR  London Heathrow-ONT Ontario
36h 27m2 stops Amsterdam Schiphol Salt Lake City
$874Delta
Tue, Mar 30 - Thu, Apr 8
British Airways Logo
4:25 pm - 12:45 pmONT  Ontario-LHR London Heathrow
12h 20m1 stop Phoenix Sky Harbor Intl
British Airways Logo
1:00 pm - 6:24 pmLHR  London Heathrow-ONT Ontario
13h 24m1 stop Phoenix Sky Harbor Intl
$884British Airways
Tue, Mar 30 - Fri, Apr 9
British Airways Logo
4:25 pm - 12:45 pmONT  Ontario-LHR London Heathrow
12h 20m1 stop Phoenix Sky Harbor Intl
British Airways Logo
1:00 pm - 6:24 pmLHR  London Heathrow-ONT Ontario
13h 24m1 stop Phoenix Sky Harbor Intl
$884British Airways

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 27% cheaper than the average day, while Wednesday is the most expensive, with prices 7% 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

$310
Beat the crowds with an average 50% drop in travelers.
The most popular month to fly with an average 79% 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 $686 to $1,179, with an average of $893 over the past 12 months. Anything below $686 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 $325, which is 48% 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
    • Seattle/Tacoma Intl (SEA) - 24% of one-stop connections
    • Denver Intl (DEN) - 22% of one-stop connections
    • Phoenix Sky Harbor Intl (PHX) - 14% 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 32% on flights from Ontario to London Heathrow Airport. Thursday is the cheapest departure day at $652 round-trip on average, while Wednesday is the most expensive at $956, a difference of $304.

    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 05m, compared with 13h 16m via Denver Intl (DEN) and 13h 28m 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 Wednesday. On this route, Thursday flights average $652, about $304 less than Wednesday fares (32% 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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