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$236+ Cheap flights from Ontario (ONT) to the United Kingdom

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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Ontario to United Kingdom

Keep the following information in mind while searching for Ontario to United Kingdom flight deals. Data was last updated September 11, 2025.

Round-trip from

$568
(Netflights)

One-way from

$236
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$622
From Ontario to United Kingdom
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One-way flight from Ontario to United Kingdom
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Highest demand for flights based on searches. 11% potential increase in price ($92 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 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 Ontario to United Kingdom

Cheapest flights from Ontario to United Kingdom
Explore the most affordable flight options available from Ontario to United Kingdom. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Netflights deal was found by Cheapflights users on 9/10. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/86:40 amONT - LHR
1 stop22h 10mVirgin Atlantic
Fri 1/1612:20 pmLHR - ONT
1 stop18h 18mVirgin Atlantic
Deal found 9/10$568
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/116:00 amONT - MAN
2 stops20h 30mDelta
Tue 11/181:30 pmMAN - ONT
2 stops30h 48mDelta
Deal found 9/10$570
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1211:36 amONT - MAN
1 stop12h 59mDelta
Tue 10/212:15 pmMAN - ONT
2 stops28h 53mDelta
Deal found 9/10$581
This Finnair deal was found by Cheapflights users on 9/11. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/286:10 amONT - MAN
2 stops28h 05mMultiple Airlines
Tue 11/46:00 pmMAN - ONT
2 stops32h 21mMultiple Airlines
Deal found 9/11$582
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2911:36 amONT - MAN
2 stops24h 04mDelta
Wed 11/51:30 pmMAN - ONT
1 stop16h 52mDelta
Deal found 9/10$585
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/287:05 amONT - MAN
2 stops26h 00mDelta
Tue 11/41:30 pmMAN - ONT
1 stop16h 52mDelta
Deal found 9/11$586
This oojo deal was found by Cheapflights users on 9/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/236:10 amONT - LHR
1 stop16h 15mBritish Airways
Tue 10/218:20 amLHR - ONT
1 stop16h 08mBritish Airways
Deal found 9/9$587
This American Airlines deal was found by Cheapflights users on 9/10. 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.
Wed 10/292:51 pmONT - MAN
2 stops20h 54mAmerican Airlines
Wed 11/56:10 amMAN - ONT
2 stops21h 31mAmerican Airlines
Deal found 9/10$588
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/47:05 amONT - MAN
2 stops19h 05mDelta
Tue 11/111:30 pmMAN - ONT
1 stop29h 10mDelta
Deal found 9/10$590
This American Airlines deal was found by Cheapflights users on 9/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/214:45 pmONT - LHR
1 stop12h 05mAmerican Airlines
Tue 10/712:00 pmLHR - ONT
1 stop14h 52mAmerican Airlines
Deal found 9/11$591
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/247:05 amONT - LHR
1 stop16h 10mDelta
Wed 10/19:00 amLHR - ONT
2 stops21h 40mDelta
Deal found 9/11$594
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/11:15 pmONT - LHR
1 stop12h 35mDelta
Thu 10/306:20 amLHR - ONT
2 stops23h 21mDelta
Deal found 9/11$595

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to United Kingdom 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 11, 2025.
Use the filters below to find and compare flights from Ontario to the United Kingdom that are best for you.

Fly from

Ontario

Fly to

United Kingdom

Route

Depart

Return

Price

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 11/11

6:00 am-10:30 am

2 stops20h 30m

Manchester

Tue 11/18

1:30 pm-12:18 pm

2 stops30h 48m

$570

OntarioGlasgow

ONT - GLA

ONTGLA

Ontario

Tue 3/3

3:05 pm-3:50 pm

2 stops16h 45m

Glasgow Intl

Thu 3/12

9:55 am-9:40 pm

2 stops18h 45m

$581

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Sun 10/12

11:36 am-8:35 am

1 stop12h 59m

Manchester

Tue 10/21

2:15 pm-11:08 am

2 stops28h 53m

$581

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 10/28

7:05 am-4:05 pm

2 stops26h 00m

Manchester

Tue 11/4

1:30 pm-10:22 pm

1 stop16h 52m

$586

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 10/22

7:05 am-6:45 am

1 stop15h 40m

London Heathrow

Wed 10/29

6:20 am-9:20 pm

2 stops22h 00m

$594

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 10/27

2:51 pm-12:15 pm

1 stop14h 24m

London Heathrow

Fri 11/7

10:05 am-6:21 pm

1 stop16h 16m

$601

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 10/27

2:51 pm-11:40 am

1 stop13h 49m

London Heathrow

Fri 11/7

9:55 am-7:41 pm

1 stop17h 46m

$602

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 9/21

7:05 am-7:15 am

1 stop16h 10m

London Heathrow

Wed 10/1

1:25 pm-10:40 pm

1 stop17h 15m

$602

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 9/23

7:05 am-6:45 am

1 stop15h 40m

London Heathrow

Tue 9/30

1:25 pm-10:40 pm

1 stop17h 15m

$602

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 9/22

11:50 am-2:15 pm

1 stop18h 25m

London Heathrow

Thu 10/2

11:20 am-7:15 pm

1 stop15h 55m

$602

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

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

Have a flexible travel schedule? Discover the best time to fly to United Kingdom from Ontario 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 Ontario to the United Kingdom

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

Currently, November is the cheapest month in which you can book a flight from Ontario to United Kingdom (average of $661). Flying from Ontario to United Kingdom in June is currently the most expensive (average of $1,098). 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 ONT to GB?

Find hourly flight availability from Ontario to United Kingdom. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

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

Reviews of airlines servicing United Kingdom

Get insights into the airlines that provide service to United Kingdom. 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 United Kingdom. Reviews last updated September 11, 2025.
Read through reviews of airlines operating flights from Ontario to the United Kingdom, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Iberia
7.0
Good
2,929 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
British Airways
6.7
Okay
7,361 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Ontario to United Kingdom. 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 from for flights from Ontario to United Kingdom?

    If you book a flight to United Kingdom from Ontario, you will be flying from 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 Ontario to United Kingdom?

    Airlines like Delta, British Airways, and KLM fly from Ontario to United Kingdom in about 16h 45m. The time it takes to get you to your destination can typically vary by up to 10h 10m. Airlines will cover a distance of 5088 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    The cheapest airline one-way is JetBlue, with whom users have recently found tickets for as low as $374. However, be on the lookout for offers from American Airlines and KLM, as they are both options that can get you from Ontario to United Kingdom for a low price.

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

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

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to United Kingdom 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 Ontario to United Kingdom?

    Currently, November is the cheapest month in which you can book a flight from Ontario to United Kingdom (average of $661). Flying from Ontario to United Kingdom in June is currently the most expensive (average of $1,098). 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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Top 7 airlines flying from Ontario to United Kingdom

Discover the top 7 airlines that operate flights from Ontario to United Kingdom. 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 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$469Average$884FlexibilityNo cancel feeOn-time72%
DeltaCheapest$572Average$748FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$580Average$704FlexibilityNo cancel feeOn-time75%
IberiaCheapest$582Average$670FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$653Average$957FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$660Average$886FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$677Average$820FlexibilityNo cancel feeOn-time69%

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