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Ontario

$440+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
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Cheap 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 February 11, 2026.

This United Airlines deal was found by Cheapflights users on 2/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:35 am
LHR
-
ONT
2 stops19h 06m
United Airlines
Tue 3/171:50 pm
ONT
-
LHR
1 stop12h 50m
United Airlines
Deal found 2/9$492
This United Airlines deal was found by Cheapflights users on 2/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/11:30 pm
LHR
-
ONT
2 stops17h 27m
United Airlines
Wed 3/116:00 am
ONT
-
LHR
2 stops17h 20m
United Airlines
Deal found 2/8$493
This TravelUp deal was found by Cheapflights users on 2/11. 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 7/110:55 am
LHR
-
ONT
1 stop13h 19m
Virgin Atlantic
Sat 8/12:00 pm
ONT
-
LHR
1 stop14h 10m
Virgin Atlantic
Deal found 2/11$527
This United Airlines deal was found by Cheapflights users on 2/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/286:30 am
LHR
-
ONT
2 stops19h 11m
United Airlines
Sun 3/81:50 pm
ONT
-
LHR
1 stop12h 50m
United Airlines
Deal found 2/11$528
This Expedia deal was found by Cheapflights users on 2/9. 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.
Tue 3/31:25 pm
LHR
-
ONT
2 stops31h 18m
Air Canada
Tue 3/176:15 am
ONT
-
LHR
2 stops17h 15m
Air Canada
Deal found 2/9$532
This Expedia deal was found by Cheapflights users on 2/11. 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.
Thu 2/198:20 am
LHR
-
ONT
1 stop22h 09m
Iberia
Thu 2/267:00 am
ONT
-
LHR
1 stop15h 50m
Iberia
Deal found 2/11$536
This American Airlines deal was found by Cheapflights users on 2/10. 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 8/3112:20 pm
LGW
-
ONT
2 stops41h 08m
American Airlines
Sun 9/208:02 pm
ONT
-
LGW
2 stops28h 38m
American Airlines
Deal found 2/10$536
This TravelUp deal was found by Cheapflights users on 2/11. 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 2/194:30 pm
LHR
-
ONT
1 stop15h 29m
British Airways
Thu 2/262:39 pm
ONT
-
LHR
1 stop13h 01m
British Airways
Deal found 2/11$538
This United Airlines deal was found by Cheapflights users on 2/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2510:05 am
LHR
-
ONT
1 stop14h 36m
United Airlines
Wed 4/111:05 am
ONT
-
LHR
2 stops17h 15m
United Airlines
Deal found 2/8$543
This Orbitz deal was found by Cheapflights users on 2/11. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/281:25 pm
LHR
-
ONT
2 stops31h 18m
Air Canada
Sun 3/86:15 am
ONT
-
LHR
2 stops22h 35m
Air Canada
Deal found 2/11$544
This British Airways deal was found by Cheapflights users on 2/8. 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.
Tue 2/177:15 pm
LCY
-
ONT
2 stops46h 51m
British Airways
Sun 3/811:58 pm
ONT
-
LCY
2 stops31h 37m
British Airways
Deal found 2/8$631
This British Airways deal was found by Cheapflights users on 2/8. 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.
Tue 2/177:15 pm
LCY
-
ONT
2 stops46h 51m
British Airways
Thu 2/2610:56 am
ONT
-
LCY
2 stops37h 54m
British Airways
Deal found 2/8$639

Find 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 February 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$492
(United Airlines)

One-way from

$440
(British Airways)

Popular in

December

Cheapest in

September

Average price

$532
Provider with most accurate pricing for London (LON)-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Los Angeles flights.
Search Deals
From United Kingdom to Ontario
Search Deals
One-way flight from United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 11, 2026.
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

Sun 3/1

11:30 am-10:57 pm

2 stops19h 27m

Ontario

Wed 3/11

1:40 pm-12:00 pm

1 stop15h 20m

$493

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 2/28

8:20 am-4:19 pm

1 stop15h 59m

Ontario

Tue 3/3

2:39 pm-11:40 am

1 stop13h 01m

$561

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 3/6

11:55 am-10:29 pm

1 stop18h 34m

Ontario

Mon 3/9

2:39 pm-11:40 am

1 stop14h 01m

$567

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 3/1

8:20 am-6:42 pm

1 stop18h 22m

Ontario

Mon 3/9

2:39 pm-12:15 pm

1 stop14h 36m

$589

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 3/30

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Sun 4/5

10:56 am-8:05 am

1 stop13h 09m

$592

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 3/30

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Tue 4/7

10:59 am-8:05 am

1 stop13h 06m

$592

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 4/13

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Thu 4/23

10:59 am-8:05 am

1 stop13h 06m

$604

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/31

11:40 am-10:34 pm

1 stop18h 54m

Ontario

Tue 4/7

6:00 am-3:35 pm

1 stop25h 35m

$606

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 5/2

11:15 am-9:00 pm

1 stop17h 45m

Ontario

Thu 5/7

5:50 pm-3:35 pm

1 stop13h 45m

$609

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/28

11:15 am-6:33 pm

1 stop15h 18m

Ontario

Sat 5/9

1:35 pm-12:10 pm

1 stop14h 35m

$609

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

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, February is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of $317). Flying from United Kingdom to Ontario in July is currently the most expensive (average of $523). 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.

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 February 11, 2026.
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
9,276 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

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
9,276 reviews
United Airlines
7.4
Good
9,276 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

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 15h 59m. 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 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, February is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of $317). Flying from United Kingdom to Ontario in July is currently the most expensive (average of $523). 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 February 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$497Average$694FlexibilityNo cancel feeOn-time69%

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