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Ontario

$542+ Cheap flights from the United Kingdom to Ontario (ONT)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Cheap flight deals from United Kingdom to Ontario

Keep the following information in mind while searching for United Kingdom to Ontario flight deals. Data was last updated July 31, 2025.

Round-trip from

$542
(Netflights)

One-way from

$490
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$811
From United Kingdom to Ontario
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One-way flight from United Kingdom to Ontario
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Highest demand for flights based on searches. 13% potential increase in price ($102 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from United Kingdom to Ontario

Cheapest flights from United Kingdom to Ontario
Explore the most affordable flight options available from United Kingdom to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

This Netflights deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/138:20 amLHR - ONT
1 stop22h 13mBritish Airways
Sat 9/2012:47 pmONT - LHR
1 stop15h 58mBritish Airways
Deal found 7/29$542
This American Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2910:40 amLGW - ONT
2 stops18h 59mAmerican Airlines
Thu 9/117:16 pmONT - LGW
2 stops28h 54mAmerican Airlines
Deal found 7/31$548
This Netflights deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/236:20 amLHR - ONT
2 stops25h 26mVirgin Atlantic
Sat 12/66:00 amONT - LHR
2 stops22h 15mVirgin Atlantic
Deal found 7/31$553
This American Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2412:00 pmLHR - ONT
1 stop14h 25mAmerican Airlines
Tue 9/94:45 pmONT - LHR
1 stop12h 05mAmerican Airlines
Deal found 7/31$567
This TravelUp deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/162:20 pmLHR - ONT
1 stop16h 21mKLM
Mon 11/2412:00 pmONT - LHR
1 stop14h 35mKLM
Deal found 7/31$570
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/148:40 amLHR - ONT
2 stops21h 43mDelta
Sun 9/2111:50 amONT - LHR
1 stop18h 25mDelta
Deal found 7/31$573
This Iberia deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/206:15 amLHR - ONT
2 stops20h 39mIberia
Fri 10/310:54 amONT - LHR
1 stop19h 31mIberia
Deal found 7/31$578
This Netflights deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/108:40 amLCY - ONT
2 stops22h 02mVirgin Atlantic
Thu 9/2511:55 amONT - LCY
2 stops20h 45mVirgin Atlantic
Deal found 7/31$593
This Expedia deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/1411:35 amLGW - ONT
2 stops20h 24mIberia
Sun 9/212:30 pmONT - LGW
2 stops21h 30mIberia
Deal found 7/31$597
This Justfly.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/208:20 amLHR - ONT
1 stop18h 34mMultiple Airlines
Fri 9/264:45 pmONT - LHR
1 stop13h 55mMultiple Airlines
Deal found 7/31$641
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/271:10 pmEDI - ONT
2 stops34h 16mAmerican Airlines
Tue 11/1112:53 pmONT - EDI
2 stops19h 57mAmerican Airlines
Deal found 7/30$658
This Netflights deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/165:55 amMAN - ONT
2 stops25h 47mVirgin Atlantic
Mon 9/299:50 amONT - MAN
2 stops19h 20mVirgin Atlantic
Deal found 7/31$684

Cheapflights Fare Finder

 
Customize your flight search to find flights from United Kingdom to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from the United Kingdom to Ontario that are best for you.

Fly from

United Kingdom

Fly to

Ontario

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 9/13

8:20 am-10:33 pm

1 stop22h 13m

Ontario

Sat 9/20

12:47 pm-12:45 pm

1 stop15h 58m

$542

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Fri 8/29

10:40 am-9:39 pm

2 stops18h 59m

Ontario

Thu 9/11

7:16 pm-8:10 am

2 stops28h 54m

$548

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 11/23

6:20 am-11:46 pm

2 stops25h 26m

Ontario

Sat 12/6

6:00 am-12:15 pm

2 stops22h 15m

$553

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 8/24

12:00 pm-6:25 pm

1 stop14h 25m

Ontario

Tue 9/9

4:45 pm-12:50 pm

1 stop12h 05m

$567

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 11/16

2:20 pm-10:41 pm

1 stop16h 21m

Ontario

Mon 11/24

12:00 pm-10:35 am

1 stop14h 35m

$570

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 9/14

8:40 am-10:23 pm

2 stops21h 43m

Ontario

Sun 9/21

11:50 am-2:15 pm

1 stop18h 25m

$573

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 9/20

6:15 am-6:54 pm

2 stops20h 39m

Ontario

Fri 10/3

10:54 am-2:25 pm

1 stop19h 31m

$578

LondonOntario

LCY - ONT

LCYONT

London City

Wed 9/10

8:40 am-10:42 pm

2 stops22h 02m

Ontario

Thu 9/25

11:55 am-4:40 pm

2 stops20h 45m

$593

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sun 9/14

11:35 am-11:59 pm

2 stops20h 24m

Ontario

Sun 9/21

2:30 pm-8:00 pm

2 stops21h 30m

$597

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 9/14

4:25 pm-11:59 pm

1 stop15h 34m

Ontario

Tue 9/30

2:54 pm-12:45 pm

1 stop13h 51m

$611

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 60 results
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Best time to book a flight from United Kingdom to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from United Kingdom with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from the United Kingdom to Ontario

What is the cheapest month to book a flight from United Kingdom to Ontario?

Currently, August is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of $246). Flying from United Kingdom to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from GB to ONT?

Find hourly flight availability from United Kingdom to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from United Kingdom to Ontario as you normally would.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 31, 2025.
Read reviews from past customers who have flown Delta, KLM, and Finnair from the United Kingdom to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,900 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from United Kingdom to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from United Kingdom?

    If you book a flight to Ontario from United Kingdom, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • What are the cheapest airlines to fly from United Kingdom to Ontario one-way?

    The cheapest airline one-way is Iberia, with whom users have recently found tickets for as low as $623. However, be on the lookout for offers from British Airways and WestJet, as they are both options that can get you from United Kingdom to Ontario for a low price.

  • What are the most popular routes from United Kingdom to Ontario?

    Most travelers choose London Heathrow - Ontario, Manchester - Ontario or London Gatwick - Ontario when deciding on the best route from United Kingdom to Ontario.

  • Can I find deals for flights from United Kingdom to Ontario that include hotel bookings?

    Yes. In addition to deals on United Kingdom to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from United Kingdom to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from United Kingdom to Ontario.

  • Can I find deals for business class flights from United Kingdom to Ontario?

    Yes. Cheapflights offers flight deals from United Kingdom to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from United Kingdom to Ontario?

    Currently, August is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of $246). Flying from United Kingdom to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for United Kingdom to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from United Kingdom to Ontario

Discover the top airline that operate flights from United Kingdom to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$560Average$694FlexibilityNo cancel feeOn-time69%

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