Find cheap flights from Ontario to London

ONT - LON

Find cheap flights from Ontario to London

Round-trip
Economy
Ontario (ONT)
London All airports
Wed 7/15
Wed 7/22
Any month
Compare vs. KAYAK |
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Good to know

Low season

October Best time to beat the crowds with an average 19% drop in price.

High season

July Most popular time to fly with an average 25% increase in price.

Average price of a round-trip

$588 (avg. price over the last 2 weeks)

Good deal for a round-trip

$574 or less

When to book flights from Ontario to London

Estimated round-trip price
Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $544 or less.
  • The cheapest flight from Ontario to London was found 39 days before departure, on average.
  • Book at least 4 weeks before departure in order to get a below-average price.
  • High season is considered to be June, July and August. The cheapest month to fly is October.
  • Morning departure is around 168% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking Ontario to London flights

Are flight prices cheaper from Ontario to London because of Coronavirus (COVID-19)?

How long does a flight from Ontario to London take?

Which airlines provide the cheapest flights from Ontario to London?

Do I need a passport to fly between Ontario and London?

What’s the cheapest day of the week to fly Ontario to London?

Which airports will I be using when flying from Ontario to London?

How does KAYAK’s flight Price Forecast tool help me choose the right time to buy?

Top 5 airlines serving Ontario to London

Scores according to KAYAK customer reviews

8.3
Qatar Airways
Overall score based on 10,823 reviews
8.4
Boarding
8.2
Comfort
8.7
Crew
8.3
Entertainment
8.1
Food
Airline reviews
Read more about Qatar Airways

Book cheap flights from Ontario to London (round-trip)

Airports
Origin
Ontario
$616
only
$616
Destination
London
$616
only
$616
$636
only
$636
Wed, Oct 14
ONT
Ontario Airport
LHR
London Heathrow Airport
16h 35m
Wed, Oct 21
LHR
London Heathrow Airport
ONT
Ontario Airport
22h 00m
Trip: 8 days
Based on null reviews
Wed, Oct 14
ONT
Ontario Airport
LHR
London Heathrow Airport
13h 10m
Fri, Nov 13
LHR
London Heathrow Airport
ONT
Ontario Airport
16h 42m
Trip: 31 days
Based on null reviews
Wed, Oct 14
ONT
Ontario Airport
LHR
London Heathrow Airport
16h 00m
Wed, Oct 21
LHR
London Heathrow Airport
ONT
Ontario Airport
20h 52m
Trip: 8 days
Based on null reviews
Wed, Oct 28
ONT
Ontario Airport
LHR
London Heathrow Airport
13h 37m
Wed, Nov 25
LHR
London Heathrow Airport
ONT
Ontario Airport
16h 54m
Trip: 29 days
Based on null reviews
Wed, Oct 14
ONT
Ontario Airport
LHR
London Heathrow Airport
15h 30m
Wed, Oct 21
LHR
London Heathrow Airport
ONT
Ontario Airport
20h 13m
Trip: 8 days
Based on null reviews
Sun, Nov 1
ONT
Ontario Airport
LHR
London Heathrow Airport
20h 25m
Thu, Nov 19
LHR
London Heathrow Airport
ONT
Ontario Airport
17h 45m
Trip: 19 days
Based on null reviews
Wed, Oct 14
ONT
Ontario Airport
LHR
London Heathrow Airport
13h 10m
Wed, Oct 21
LHR
London Heathrow Airport
ONT
Ontario Airport
18h 07m
Trip: 8 days
Based on null reviews
Wed, Oct 14
ONT
Ontario Airport
LHR
London Heathrow Airport
16h 00m
Wed, Oct 21
LHR
London Heathrow Airport
ONT
Ontario Airport
17h 45m
Trip: 8 days
Based on null reviews
Mon, Oct 12
ONT
Ontario Airport
LHR
London Heathrow Airport
13h 47m
Wed, Nov 11
LHR
London Heathrow Airport
ONT
Ontario Airport
15h 34m
Trip: 31 days
Based on null reviews
Wed, Oct 14
ONT
Ontario Airport
LHR
London Heathrow Airport
16h 41m
Wed, Oct 21
LHR
London Heathrow Airport
ONT
Ontario Airport
36h 27m
Trip: 8 days
Based on null reviews
Wed, Dec 2
ONT
Ontario Airport
LHR
London Heathrow Airport
12h 55m
Thu, Dec 10
LHR
London Heathrow Airport
ONT
Ontario Airport
15h 13m
Trip: 9 days
Based on null reviews
Wed, Oct 14
ONT
Ontario Airport
LHR
London Heathrow Airport
15h 35m
Wed, Oct 21
LHR
London Heathrow Airport
ONT
Ontario Airport
17h 45m
Trip: 8 days
Based on null reviews
Sun, Nov 1
ONT
Ontario Airport
LHR
London Heathrow Airport
30h 15m
Thu, Nov 19
LHR
London Heathrow Airport
ONT
Ontario Airport
19h 17m
Trip: 19 days
Based on null reviews
Sat, Oct 3
ONT
Ontario Airport
LHR
London Heathrow Airport
19h 30m
Tue, Oct 13
LHR
London Heathrow Airport
ONT
Ontario Airport
23h 39m
Trip: 11 days
Based on null reviews
Wed, Oct 14
ONT
Ontario Airport
LHR
London Heathrow Airport
18h 45m
Wed, Oct 21
LHR
London Heathrow Airport
ONT
Ontario Airport
17h 47m
Trip: 8 days
Based on null reviews
Wed, Nov 18
ONT
Ontario Airport
LHR
London Heathrow Airport
12h 55m
Thu, Jan 7
LHR
London Heathrow Airport
ONT
Ontario Airport
15h 13m
Trip: 51 days
Based on null reviews
Tue, Sep 1
ONT
Ontario Airport
LHR
London Heathrow Airport
16h 45m
Wed, Sep 23
LHR
London Heathrow Airport
ONT
Ontario Airport
19h 25m
Trip: 23 days
Based on null reviews
Wed, Sep 9
ONT
Ontario Airport
LHR
London Heathrow Airport
13h 10m
Wed, Sep 16
LHR
London Heathrow Airport
ONT
Ontario Airport
21h 43m
Trip: 8 days
Based on null reviews
Thu, Sep 3
ONT
Ontario Airport
LGW
London Gatwick Airport
15h 19m
Thu, Sep 17
LGW
London Gatwick Airport
ONT
Ontario Airport
18h 18m
Trip: 15 days
Based on null reviews
Wed, Sep 2
ONT
Ontario Airport
LHR
London Heathrow Airport
13h 47m
Wed, Sep 9
LHR
London Heathrow Airport
ONT
Ontario Airport
19h 25m
Trip: 8 days
Based on null reviews
Show more results

Book cheap flights from Ontario to London (one-way)

Airports
Origin
Ontario
$280
only
$280
Destination
London
$346
only
$346
$474
only
$474
$280
only
$280
Tue, Sep 15
ONT
Ontario Airport
LGW
London Gatwick Airport
17h 54m
Based on null reviews
Sun, Jul 26
ONT
Ontario Airport
LHR
London Heathrow Airport
12h 41m
Based on null reviews
Mon, Jul 20
ONT
Ontario Airport
LHR
London Heathrow Airport
33h 23m
Based on null reviews
Tue, Aug 11
ONT
Ontario Airport
LCY
London City
17h 06m
Based on null reviews
Tue, Sep 1
ONT
Ontario Airport
LHR
London Heathrow Airport
22h 15m
Based on null reviews
Thu, Jul 23
ONT
Ontario Airport
LHR
London Heathrow Airport
13h 14m
Based on null reviews
Tue, Jul 7
ONT
Ontario Airport
LHR
London Heathrow Airport
17h 20m
Based on null reviews
Thu, Sep 3
ONT
Ontario Airport
LHR
London Heathrow Airport
25h 50m
Based on null reviews
Tue, Sep 1
ONT
Ontario Airport
LHR
London Heathrow Airport
29h 10m
Based on null reviews
Wed, Aug 5
ONT
Ontario Airport
LHR
London Heathrow Airport
29h 09m
Based on null reviews
Sun, Jul 26
ONT
Ontario Airport
LCY
London City
20h 10m
Based on null reviews
Sun, Aug 16
ONT
Ontario Airport
LCY
London City
19h 00m
Based on null reviews
Mon, Jul 6
ONT
Ontario Airport
LHR
London Heathrow Airport
15h 25m
Based on null reviews
Sun, Jul 26
ONT
Ontario Airport
LHR
London Heathrow Airport
12h 41m
Based on null reviews
Wed, Sep 2
ONT
Ontario Airport
LCY
London City
19h 00m
Based on null reviews
Mon, Aug 3
ONT
Ontario Airport
LHR
London Heathrow Airport
13h 05m
Based on null reviews
Fri, Sep 4
ONT
Ontario Airport
LHR
London Heathrow Airport
13h 47m
Based on null reviews
Sat, Aug 15
ONT
Ontario Airport
LHR
London Heathrow Airport
29h 16m
Based on null reviews
Fri, Sep 4
ONT
Ontario Airport
LHR
London Heathrow Airport
24h 20m
Based on null reviews
Tue, Jul 21
ONT
Ontario Airport
LHR
London Heathrow Airport
12h 41m
Based on null reviews
Show more results
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an and someone from our team will get back to you promptly.

^
The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.
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