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$272+ 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 4/8. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
Apr 8 — Apr 151
Tue 4/8
Tue 4/15
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 3, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$597
(Iberia)

One-way from

$272
(Trip.com)

Popular in

June

Cheapest in

October

Average price

$645
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. 13% potential increase in price ($119 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 3, 2025.

This Iberia deal was found by Cheapflights users on 4/3. 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.
Wed 4/3010:54 amONT - LHR
1 stop14h 06mIberia
Tue 5/66:10 amLHR - ONT
2 stops23h 48mIberia
Deal found 4/3$597
This Cheapflightsfares deal was found by Cheapflights users on 4/2. 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 11/45:01 pmONT - LHR
1 stop12h 19mBritish Airways
Tue 11/112:30 pmLHR - ONT
1 stop15h 11mBritish Airways
Deal found 4/2$611
This oojo deal was found by Cheapflights users on 4/2. 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.
Wed 4/164:35 pmONT - GLA
2 stops17h 15mBritish Airways
Wed 4/237:00 amGLA - ONT
2 stops19h 20mBritish Airways
Deal found 4/2$627
This Delta deal was found by Cheapflights users on 4/2. 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 4/177:00 amONT - LHR
1 stop22h 30mDelta
Tue 4/296:15 amLHR - ONT
2 stops24h 28mDelta
Deal found 4/2$628
This oojo deal was found by Cheapflights users on 4/3. 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 5/62:44 pmONT - MAN
2 stops20h 21mBritish Airways
Fri 5/1610:30 amMAN - ONT
2 stops21h 13mBritish Airways
Deal found 4/3$649
This oojo deal was found by Cheapflights users on 4/2. 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.
Fri 5/27:00 amONT - NCL
2 stops18h 05mBritish Airways
Fri 5/95:55 amNCL - ONT
2 stops20h 28mBritish Airways
Deal found 4/2$668
This Delta deal was found by Cheapflights users on 4/2. 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 8/277:00 amONT - LGW
2 stops19h 00mDelta
Wed 9/312:00 pmLGW - ONT
2 stops31h 07mDelta
Deal found 4/2$684
This United Airlines deal was found by Cheapflights users on 4/2. 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 4/226:00 amONT - LHR
2 stops16h 30mUnited Airlines
Mon 5/129:30 amLHR - ONT
2 stops35h 08mUnited Airlines
Deal found 4/2$685
This American Airlines deal was found by Cheapflights users on 4/2. 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 5/24:35 pmONT - LHR
1 stop12h 15mAmerican Airlines
Sun 5/183:40 pmLHR - ONT
1 stop14h 17mAmerican Airlines
Deal found 4/2$690
This United Airlines deal was found by Cheapflights users on 4/2. 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 11/167:00 amONT - MAN
2 stops19h 20mUnited Airlines
Thu 11/279:30 amMAN - ONT
2 stops19h 51mUnited Airlines
Deal found 4/2$704
This Air Canada deal was found by Cheapflights users on 4/2. 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 4/306:00 amONT - LHR
2 stops19h 35mMultiple Airlines
Wed 5/79:30 amLHR - ONT
2 stops19h 23mMultiple Airlines
Deal found 4/2$715
This United Airlines deal was found by Cheapflights users on 4/1. 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 10/87:00 amONT - EDI
1 stop17h 25mUnited Airlines
Wed 10/1511:30 amEDI - ONT
1 stop18h 56mUnited Airlines
Deal found 4/1$721

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 3, 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

Wed 4/30

10:54 am-9:00 am

1 stop14h 06m

London Heathrow

Tue 5/6

6:10 am-9:58 pm

2 stops23h 48m

$597

OntarioGlasgow

ONT - GLA

ONTGLA

Ontario

Wed 4/16

4:35 pm-5:50 pm

2 stops17h 15m

Glasgow Intl

Wed 4/23

7:00 am-6:20 pm

2 stops19h 20m

$627

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 4/17

7:00 am-1:30 pm

1 stop22h 30m

London Heathrow

Tue 4/29

6:15 am-10:43 pm

2 stops24h 28m

$628

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 5/6

2:44 pm-7:05 pm

2 stops20h 21m

Manchester

Fri 5/16

10:30 am-11:43 pm

2 stops21h 13m

$649

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 5/2

4:35 pm-12:50 pm

1 stop12h 15m

London Heathrow

Sun 5/18

8:00 pm-6:36 pm

2 stops30h 36m

$655

OntarioNewcastle upon Tyne

ONT - NCL

ONTNCL

Ontario

Fri 5/2

7:00 am-9:05 am

2 stops18h 05m

Newcastle upon Tyne

Fri 5/9

5:55 am-6:23 pm

2 stops20h 28m

$668

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 8/27

7:00 am-10:00 am

2 stops19h 00m

London Gatwick

Wed 9/3

12:00 pm-11:07 am

2 stops31h 07m

$684

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 4/22

6:00 am-6:30 am

2 stops16h 30m

London Heathrow

Mon 5/12

9:30 am-12:38 pm

2 stops35h 08m

$685

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 5/2

4:35 pm-12:50 pm

1 stop12h 15m

London Heathrow

Sun 5/18

3:40 pm-9:57 pm

1 stop14h 17m

$690

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 4/30

7:05 am-9:35 am

2 stops18h 30m

London Heathrow

Tue 5/6

9:30 am-8:53 pm

2 stops19h 23m

$715

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/3

Showing 1-10 of 60 results
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6

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 3, 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 3, 2025.
Get a feel of what it's like to fly with Delta, KLM and United Airlines 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.
Delta
8.0
Very good
7,897 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

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
7,897 reviews
Delta
8.0
Very good
7,897 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

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.
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very good
7,897 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

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
8,619 reviews
Delta
8.0
Very good
7,897 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

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.
Virgin Atlantic
7.4
Good
637 reviews
Delta
8.0
Very good
7,897 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

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.
JetBlue
7.3
Good
2,922 reviews
Delta
8.0
Very good
7,897 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

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.

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

    The cheapest airline one-way is Iberia, with whom users have recently found tickets for as low as $384. However, be on the lookout for offers from JetBlue and United Airlines, 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 - London Gatwick 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 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$454Average$884FlexibilityNo cancel feeOn-time72%
IberiaCheapest$582Average$663FlexibilityNo cancel feeOn-time77%
DeltaCheapest$598Average$1,111FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$611Average$1,045FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$629Average$755FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$629Average$918FlexibilityNo cancel feeOn-time71%

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