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Ontario

$336+ Cheap flights from the United Kingdom to Ontario (ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$490
(American Airlines)

One-way from

$336
(Thrive Travel)

Popular in

December

Cheapest in

September

Average price

$545
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. 3% potential increase in price ($23 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 September 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 September 16, 2025.

This TravelUp deal was found by Cheapflights users on 9/14. 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.
Wed 10/298:25 pmLHR - ONT
2 stops33h 16mVirgin Atlantic
Wed 11/56:00 amONT - LHR
2 stops17h 05mVirgin Atlantic
Deal found 9/14$493
This TravelUp deal was found by Cheapflights users on 9/15. 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.
Thu 10/302:45 pmLHR - ONT
1 stop14h 56mVirgin Atlantic
Thu 11/67:35 amONT - LHR
1 stop21h 15mVirgin Atlantic
Deal found 9/15$512
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/112:20 pmLGW - ONT
2 stops40h 51mAmerican Airlines
Sun 10/511:59 pmONT - LGW
2 stops24h 11mAmerican Airlines
Deal found 9/15$515
This Netflights deal was found by Cheapflights users on 9/15. 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 11/156:20 amLHR - ONT
2 stops23h 15mVirgin Atlantic
Sat 12/131:20 pmONT - LHR
1 stop12h 40mVirgin Atlantic
Deal found 9/15$517
This TravelUp deal was found by Cheapflights users on 9/14. 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.
Sat 11/224:25 pmLHR - ONT
2 stops39h 27mVirgin Atlantic
Sat 11/2911:45 amONT - LHR
1 stop36h 05mVirgin Atlantic
Deal found 9/14$520
This Mytrip deal was found by Cheapflights users on 9/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3011:55 amLHR - ONT
1 stop17h 23mBritish Airways
Thu 11/62:59 pmONT - LHR
1 stop12h 41mBritish Airways
Deal found 9/15$531
This British Airways deal was found by Cheapflights users on 9/15. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/110:30 amLHR - ONT
1 stop20h 03mBritish Airways
Wed 11/194:47 pmONT - LHR
1 stop12h 28mBritish Airways
Deal found 9/15$533
This British Airways deal was found by Cheapflights users on 9/15. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/223:10 pmLHR - ONT
1 stop15h 23mBritish Airways
Wed 10/82:51 pmONT - LHR
1 stop15h 34mBritish Airways
Deal found 9/15$534
This lastminute.com deal was found by Cheapflights users on 9/15. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/225:25 pmLHR - ONT
2 stops38h 17mVirgin Atlantic
Tue 10/71:15 pmONT - LHR
2 stops15h 55mVirgin Atlantic
Deal found 9/15$536
This Delta deal was found by Cheapflights users on 9/15. 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.
Thu 10/306:30 amLHR - ONT
2 stops19h 49mDelta
Thu 11/67:35 amONT - LHR
1 stop18h 55mDelta
Deal found 9/15$538
This Netflights deal was found by Cheapflights users on 9/15. 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 10/810:00 amLCY - ONT
2 stops20h 41mVirgin Atlantic
Wed 10/151:15 pmONT - LCY
2 stops21h 15mVirgin Atlantic
Deal found 9/15$557
This American Airlines deal was found by Cheapflights users on 9/15. 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 10/103:05 pmLGW - ONT
2 stops35h 47mMultiple Airlines
Wed 10/226:10 amONT - LGW
2 stops18h 00mMultiple Airlines
Deal found 9/15$576

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 September 16, 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

LGW - ONT

LGWONT

London Gatwick

Thu 2/26

12:30 pm-8:24 pm

2 stops39h 54m

Ontario

Mon 3/2

6:47 am-9:00 am

2 stops18h 13m

$490

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Wed 10/1

12:20 pm-9:11 pm

2 stops40h 51m

Ontario

Sun 10/5

11:59 pm-8:10 am

2 stops24h 11m

$515

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/21

11:45 am-9:11 pm

1 stop17h 26m

Ontario

Sun 11/30

4:47 pm-1:15 pm

1 stop12h 28m

$532

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 11/1

10:05 am-6:52 pm

1 stop15h 47m

Ontario

Fri 11/7

3:08 pm-12:15 pm

1 stop13h 07m

$532

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 2/20

11:45 am-8:24 pm

1 stop16h 39m

Ontario

Fri 3/6

11:05 am-8:15 am

1 stop13h 10m

$533

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 9/26

11:15 am-6:16 pm

1 stop15h 01m

Ontario

Wed 10/8

2:51 pm-2:25 pm

1 stop15h 34m

$533

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 2/14

3:00 pm-9:57 pm

1 stop14h 57m

Ontario

Sat 2/28

5:03 pm-1:15 pm

1 stop12h 12m

$533

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 10/1

10:30 am-10:33 pm

1 stop20h 03m

Ontario

Wed 11/19

4:47 pm-1:15 pm

1 stop12h 28m

$533

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 11/16

4:30 pm-11:57 pm

1 stop15h 27m

Ontario

Tue 11/25

12:49 pm-11:40 am

1 stop14h 51m

$533

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 10/1

12:00 pm-6:54 pm

1 stop14h 54m

Ontario

Mon 11/24

3:19 pm-12:15 pm

1 stop12h 56m

$533

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

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 September 16, 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 September 16, 2025.
Read reviews from past customers who have flown United Airlines 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.
United Airlines
7.4
Good
8,929 reviews

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

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.

  • How long is the flight from United Kingdom to Ontario?

    Departing from United Kingdom to Ontario will take you 17h 26m. The distance from United Kingdom to Ontario is about 5407 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as $426. However, be on the lookout for offers from American Airlines and Delta, 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$560Average$739FlexibilityNo cancel feeOn-time69%

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