LHR - ONT

£348 Find Cheap Flights from London Heathrow Airport to Ontario – Compare and Save

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Everything you should know

Cheapest return flight
£377
Typical prices: £473-£615
United Airlines
Fri 19/10Fri 26/10
LHR - ONT • 2 stops
Cheapest one-way flight
£348
Typical prices: £448-£646
Alaska Airlines
Fri 12/1
LHR - ONT • 1 stop
Direct flights
Not available
There are currently no direct flights between London Heathrow Airport and Ontario. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
January
Cheapest • 22% price drop
May
Most popular
Good to know
+1
Good to know
+1
Top stopover airports
Phoenix Sky Harbor Intl (PHX)
Cheapest • Avg £513 (return)
Denver Intl (DEN)
Shortest trip • 13h 27m (one-way)
Insights
Insights
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We hope you enjoy your trip to Ontario!
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Flight Deals

Cheap Flights from Heathrow to Ontario (LHR-ONT)

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

Recent return flight deals from Heathrow to Ontario

Mon, 19 Oct - Mon, 26 Oct
United Airlines Logo
08:40 - 17:41LHR  London Heathrow-ONT Ontario
41h 01m2 stops Zurich San Francisco
United Airlines Logo
05:00 - 09:40ONT  Ontario-LHR London Heathrow
21h 40m1 stop Denver Intl
£377United Airlines
Thu, 22 Oct - Thu, 29 Oct
United Airlines Logo
06:55 - 22:49LHR  London Heathrow-ONT Ontario
23h 54m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
United Airlines Logo
05:00 - 09:40ONT  Ontario-LHR London Heathrow
21h 40m1 stop Denver Intl
£380United Airlines
Mon, 19 Oct - Mon, 26 Oct
United Airlines Logo
06:55 - 10:23LHR  London Heathrow-ONT Ontario
35h 28m2 stops Munich Franz Josef Strauss San Francisco
United Airlines Logo
09:25 - 07:25ONT  Ontario-LHR London Heathrow
15h 00m1 stop San Francisco
£380United Airlines
Wed, 4 Nov - Fri, 4 Dec
Virgin Atlantic Logo
11:45 - 22:43LHR  London Heathrow-ONT Ontario
42h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
12:20 - 07:50ONT  Ontario-LHR London Heathrow
35h 30m1 stop Atlanta Hartsfield-Jackson
£388Virgin Atlantic
Wed, 4 Nov - Fri, 4 Dec
Virgin Atlantic Logo
15:45 - 22:43LHR  London Heathrow-ONT Ontario
38h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
06:00 - 07:05ONT  Ontario-LHR London Heathrow
17h 05m2 stops Salt Lake City Minneapolis St Paul
£388Virgin Atlantic
Mon, 5 Oct - Mon, 12 Oct
Virgin Atlantic Logo
14:45 - 23:55LHR  London Heathrow-ONT Ontario
41h 10m2 stops Amsterdam Schiphol Salt Lake City
Virgin Atlantic Logo
09:45 - 10:00ONT  Ontario-LHR London Heathrow
16h 15m1 stop Salt Lake City
£388Virgin Atlantic
Mon, 19 Oct - Mon, 26 Oct
Delta Logo
11:45 - 22:43LHR  London Heathrow-ONT Ontario
18h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Delta Logo
06:00 - 09:00ONT  Ontario-LHR London Heathrow
20h 00m2 stops Salt Lake City Atlanta Hartsfield-Jackson
£409Delta
Thu, 21 Jan - Mon, 25 Jan
Air Canada Logo
14:30 - 09:47LHR  London Heathrow-ONT Ontario
27h 17m2 stops Vancouver Intl San Francisco
Air Canada Logo
05:00 - 07:10ONT  Ontario-LHR London Heathrow
18h 10m2 stops Denver Intl Montreal Pierre Elliott Trudeau Intl
£414Air Canada
Sun, 13 Dec - Sun, 17 Jan
British Airways Logo
14:35 - 21:53LHR  London Heathrow-ONT Ontario
15h 18m1 stop Phoenix Sky Harbor Intl
British Airways Logo
16:25 - 13:35ONT  Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
£475British Airways
Mon, 11 Jan - Mon, 18 Jan
British Airways Logo
14:35 - 21:59LHR  London Heathrow-ONT Ontario
15h 24m1 stop Phoenix Sky Harbor Intl
British Airways Logo
16:25 - 13:35ONT  Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
£482British Airways
Booking Insights

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

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

How much is a return flight from London Heathrow Airport to Ontario?

Return flights from London Heathrow Airport to Ontario start at £377. Prices are below average for this route right now, with typical return fares ranging from £473 to £615. The lowest price found in the past 5 days was £377 on United Airlines.

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

Saturday is the cheapest day of the week to fly from London Heathrow Airport to Ontario and is 13% cheaper than the average day. Sunday is the most expensive day with flight prices 25% higher than average. Based on deals found by KAYAK users in the last 12 months.

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

  • January is the cheapest month to fly from London Heathrow Airport to Ontario at £408 return.
  • June (£668) and May (£655) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 63% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

Key details for London Heathrow Airport to Ontario flights

Low season

October

Cheapest flight

£348
Best time to beat the crowds (7% less expensive on average)
Most popular time to fly (25% more expensive on average)
Flights from London Heathrow Airport to Ontario

When to book flights from Heathrow to Ontario

Are your dates flexible? Find out the best times to travel from Heathrow to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

Your London Heathrow Airport to Ontario 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 London Heathrow Airport to Ontario?

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

  • Which cabin classes can I book on flights from London Heathrow Airport to Ontario?

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

    • Economy class
    • Premium Economy Class

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

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

    • Dallas/Fort Worth (DFW) – 34% of one-stop connections
    • Salt Lake City (SLC) – 16% of one-stop connections
    • Seattle/Tacoma Intl (SEA) – 15% of one-stop connections
    • Denver Intl (DEN) – 14% 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 London Heathrow Airport to Ontario?

    On the London Heathrow Airport to Ontario route, being flexible with your departure day can save you up to 31%. Saturday is the cheapest day at £456 return on average, while Sunday is the most expensive at £659 – a £203 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

  • What popular places can I visit in Ontario?

    Ontario Convention Center is one of the most viewed places in Ontario on KAYAK.

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

    A direct flight from London Heathrow Airport to Ontario takes 0h 00m, covering 5,407 miles.

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

    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 London Heathrow Airport to Ontario looking right now?

    One-way fares from London Heathrow Airport to Ontario are currently lower than usual. Average one-way flight prices are about £417, which is 19% below the typical average for this route.

  • How much time can I save by choosing a different stopover airport from London Heathrow Airport to Ontario?

    Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time of 13h 27m, compared to 14h 12m via Phoenix Sky Harbor Intl (PHX) and 14h 28m via San Francisco (SFO).

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

    Ontario is 8 hours behind London Heathrow Airport (Pacific Time vs British Time). Plan for the time shift when scheduling connections or first-day activities.

  • Which car hire options are available at Ontario Airport (ONT)?

    Ontario Airport (ONT) hosts 5 major car hire companies, with daily rates starting from around £13 for economy cars. Top options include:
    · Fox
    · Thrifty
    · Europcar
    · Dollar
    · Alamo

  • How much should I expect to pay for a London Heathrow Airport to Ontario flight?

    Return flights from London Heathrow Airport to Ontario range from £473 to £615, with an average of £524 over the past 12 months. Anything below £473 counts as a good deal.

Your guide to booking London Heathrow Airport to Ontario 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 Saturday departure instead of Sunday. On this route, Saturday flights average £456 – about £203 less than Sunday (31% savings) based on the last 12 months.
  • If you can choose when to travel, plan your London Heathrow Airport to Ontario trip for January. Fares historically average £408 return in that month – typically £260 less than the most expensive month, which is June (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ontario Airport.
    - Azure Hotel & Suites, Trademark Collection by Wyndham
    - La Quinta Inn & Suites by Wyndham Ontario Airport
    - Holiday Inn Ontario Airport By IHG

More options for your flight from Heathrow to Ontario

Complete your trip to Ontario with a hotel stay or car hire

Car hire in Ontario
Hotels in Ontario
Holidays in Ontario