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$416+ 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 7/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
Apr 29 — May 61
Tue 4/29
Tue 5/6
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 April 24, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$668
(World Air Fares)

One-way from

$416
(Mytrip)

Popular in

December

Cheapest in

October

Average price

$671
Provider with most accurate pricing for Los Angeles-London (LON) flight deals.
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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. 6% potential increase in price ($51 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 24, 2025.

This World Air Fares deal was found by Cheapflights users on 4/23. 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 World Air Fares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/231:15 pmONT - LHR
1 stop12h 25mLufthansa
Tue 10/2111:25 amLHR - ONT
1 stop13h 52mLufthansa
Deal found 4/23$668
This Netflights deal was found by Cheapflights users on 4/23. 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 8/137:00 amONT - LBA
2 stops25h 55mVirgin Atlantic
Wed 9/176:20 amLBA - ONT
2 stops24h 22mVirgin Atlantic
Deal found 4/23$684
This Cheapflightsfares deal was found by Cheapflights users on 4/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/185:01 pmONT - LHR
1 stop12h 19mBritish Airways
Tue 11/252:55 pmLHR - ONT
1 stop15h 05mBritish Airways
Deal found 4/23$690
This Iberia deal was found by Cheapflights users on 4/23. 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.
Tue 10/1412:51 pmONT - LHR
1 stop13h 59mIberia
Tue 10/2110:50 amLHR - ONT
2 stops21h 12mIberia
Deal found 4/23$698
This United Airlines deal was found by Cheapflights users on 4/23. 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 5/71:20 pmONT - LHR
1 stop12h 20mUnited Airlines
Wed 5/149:30 amLHR - ONT
2 stops19h 04mUnited Airlines
Deal found 4/23$707
This United Airlines deal was found by Cheapflights users on 4/23. 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 8/127:00 amONT - MAN
2 stops17h 25mUnited Airlines
Tue 9/1610:40 amMAN - ONT
2 stops19h 50mUnited Airlines
Deal found 4/23$721
This Netflights deal was found by Cheapflights users on 4/23. 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 8/1212:00 pmONT - LBA
2 stops26h 50mMultiple Airlines
Tue 9/1610:05 amLBA - ONT
2 stops20h 37mMultiple Airlines
Deal found 4/23$722
This Air Canada deal was found by Cheapflights users on 4/23. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/75:05 amONT - LHR
2 stops17h 30mMultiple Airlines
Wed 5/149:30 amLHR - ONT
2 stops19h 23mMultiple Airlines
Deal found 4/23$725
This United Airlines deal was found by Cheapflights users on 4/22. 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.
Mon 9/297:00 amONT - EDI
1 stop17h 25mUnited Airlines
Thu 10/99:00 amEDI - ONT
2 stops40h 17mUnited Airlines
Deal found 4/22$734
This JetBlue deal was found by Cheapflights users on 4/22. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/110:40 pmONT - LHR
1 stop14h 05mJetBlue
Fri 5/168:15 amLHR - ONT
1 stop20h 56mJetBlue
Deal found 4/22$748
This Delta deal was found by Cheapflights users on 4/23. 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 9/102:00 pmONT - LHR
1 stop13h 20mDelta
Sat 9/206:30 amLHR - ONT
2 stops21h 12mDelta
Deal found 4/23$754
This oojo deal was found by Cheapflights users on 4/22. 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.
Thu 9/118:43 amONT - BHD
2 stops18h 27mBritish Airways
Thu 9/2512:40 pmBHD - ONT
2 stops17h 00mBritish Airways
Deal found 4/22$760

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 April 24, 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

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 9/23

1:15 pm-9:40 am

1 stop12h 25m

London Heathrow

Tue 10/21

11:25 am-5:17 pm

1 stop13h 52m

$668

OntarioLeeds

ONT - LBA

ONTLBA

Ontario

Wed 8/13

7:00 am-4:55 pm

2 stops25h 55m

Leeds/Bradford

Wed 9/17

6:20 am-10:42 pm

2 stops24h 22m

$684

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/14

12:51 pm-10:50 am

1 stop13h 59m

London Heathrow

Tue 10/21

10:50 am-12:02 am

2 stops21h 12m

$698

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 5/7

1:20 pm-9:40 am

1 stop12h 20m

London Heathrow

Wed 5/14

9:30 am-8:34 pm

2 stops19h 04m

$707

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 8/12

7:00 am-8:25 am

2 stops17h 25m

Manchester

Tue 9/16

10:40 am-10:30 pm

2 stops19h 50m

$721

OntarioLeeds

ONT - LBA

ONTLBA

Ontario

Tue 8/12

12:00 pm-10:50 pm

2 stops26h 50m

Leeds/Bradford

Tue 9/16

10:05 am-10:42 pm

2 stops20h 37m

$722

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 5/7

5:05 am-6:35 am

2 stops17h 30m

London Heathrow

Wed 5/14

9:30 am-8:53 pm

2 stops19h 23m

$725

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Mon 9/29

7:00 am-8:25 am

1 stop17h 25m

Edinburgh Turnhouse

Thu 10/9

9:00 am-5:17 pm

2 stops40h 17m

$734

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 5/3

10:40 pm-8:45 pm

1 stop14h 05m

London Heathrow

Wed 5/7

11:55 am-9:11 pm

1 stop17h 16m

$750

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 9/10

2:00 pm-11:20 am

1 stop13h 20m

London Heathrow

Sat 9/20

6:30 am-7:42 pm

2 stops21h 12m

$754

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

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 $1,110). 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 April 24, 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.

Rainfall in United Kingdom by month

Plan your trip to United Kingdom by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in United Kingdom ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit United Kingdom when rainfall is around 1.6 in.

Temperature in United Kingdom by month

Plan your trip to United Kingdom by taking into account the average temperature totals by month.

If weather is an important factor for your trip to United Kingdom, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 April 24, 2025.
Get a feel of what it's like to fly with China Airlines, Delta and KLM from Ontario to United Kingdom by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
China Airlines
8.3
Very good
727 reviews

Entertainment

8.0

Comfort

8.0

Crew

8.5

Boarding

8.3

Food

7.8

Overall

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
China Airlines
8.3
Very good
727 reviews
China Airlines
8.3
Very good
727 reviews

Entertainment

8.0

Comfort

8.0

Crew

8.5

Boarding

8.3

Food

7.8

Overall

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
Delta
8.0
Very good
7,920 reviews
China Airlines
8.3
Very good
727 reviews

Entertainment

8.0

Comfort

8.0

Crew

8.5

Boarding

8.3

Food

7.8

Overall

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
KLM
7.8
Good
1,333 reviews
China Airlines
8.3
Very good
727 reviews

Entertainment

8.0

Comfort

8.0

Crew

8.5

Boarding

8.3

Food

7.8

Overall

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
United Airlines
7.4
Good
8,685 reviews
China Airlines
8.3
Very good
727 reviews

Entertainment

8.0

Comfort

8.0

Crew

8.5

Boarding

8.3

Food

7.8

Overall

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
Virgin Atlantic
7.4
Good
642 reviews
China Airlines
8.3
Very good
727 reviews

Entertainment

8.0

Comfort

8.0

Crew

8.5

Boarding

8.3

Food

7.8

Overall

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver

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.

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

    The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as $416. However, be on the lookout for offers from KLM and Delta, 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 - Edinburgh Turnhouse 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 $1,110). 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 Ontario to United Kingdom

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Ontario to United Kingdom

Discover the top 6 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 April 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$454Average$884FlexibilityNo cancel feeOn-time72%
IberiaCheapest$582Average$663FlexibilityNo cancel feeOn-time77%
DeltaCheapest$598Average$1,077FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$611Average$923FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$629Average$768FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$629Average$1,019FlexibilityNo cancel feeOn-time71%

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