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$260+ 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 3/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
mar. 8 — mar. 151
sáb. 3/8
sáb. 3/15
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 marzo 3, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$590
(oojo)

One-way from

$260
(Trip.com)

Popular in

June

Cheapest in

October

Average price

$658
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. 15% potential increase in price ($140 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in March 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 marzo 3, 2025.

This oojo deal was found by Cheapflights users on 3/2. 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.
mar. 4/110:57 amONT - MAN
2 stops18h 13mBritish Airways
mar. 4/87:55 amMAN - ONT
2 stops22h 03mBritish Airways
Deal found 3/2$590
This Ticket deal was found by Cheapflights users on 3/2. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 3/1612:46 pmONT - LHR
1 stop14h 49mKLM
mar. 4/110:55 amLHR - ONT
1 stop13h 39mKLM
Deal found 3/2$592
This Iberia deal was found by Cheapflights users on 3/3. 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.
mar. 3/2510:57 amONT - LHR
1 stop13h 23mIberia
mié. 4/23:10 pmLHR - ONT
1 stop15h 17mIberia
Deal found 3/3$617
This oojo deal was found by Cheapflights users on 3/2. 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.
mié. 4/1612:50 pmONT - GLA
2 stops18h 45mBritish Airways
vie. 4/257:00 amGLA - ONT
2 stops19h 20mBritish Airways
Deal found 3/2$623
This Booking.com deal was found by Cheapflights users on 3/2. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/14:30 pmONT - LHR
1 stop12h 20mBritish Airways
mar. 4/83:40 pmLHR - ONT
1 stop14h 18mBritish Airways
Deal found 3/2$632
This Delta deal was found by Cheapflights users on 3/2. 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.
mar. 4/81:30 pmONT - LHR
1 stop12h 20mDelta
mar. 4/1511:30 amLHR - ONT
2 stops19h 06mDelta
Deal found 3/2$640
This United Airlines deal was found by Cheapflights users on 3/2. 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.
mar. 4/16:10 amONT - LHR
2 stops16h 45mUnited Airlines
mar. 4/87:25 amLHR - ONT
2 stops18h 26mUnited Airlines
Deal found 3/2$652
This American Airlines deal was found by Cheapflights users on 3/2. 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.
jue. 9/258:43 amONT - LGW
2 stops17h 57mAmerican Airlines
mié. 10/812:20 pmLGW - ONT
2 stops19h 42mAmerican Airlines
Deal found 3/2$664
This Air Canada deal was found by Cheapflights users on 3/2. 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.
mar. 4/16:10 amONT - LHR
2 stops19h 25mMultiple Airlines
mar. 4/85:40 pmLHR - ONT
2 stops26h 58mMultiple Airlines
Deal found 3/2$669
This Air France deal was found by Cheapflights users on 3/3. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 3/2912:46 pmONT - LHR
1 stop14h 24mAir France
mié. 4/911:00 amLHR - ONT
1 stop13h 33mAir France
Deal found 3/3$699
This Delta deal was found by Cheapflights users on 3/2. 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.
dom. 8/247:00 amONT - MAN
1 stop17h 35mDelta
dom. 9/2112:35 pmMAN - ONT
1 stop17h 54mDelta
Deal found 3/2$701
This Booking.com deal was found by Cheapflights users on 3/2. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/241:40 pmONT - LHR
2 stops33h 50mAir Canada
lun. 4/79:30 amLHR - ONT
2 stops37h 47mAir Canada
Deal found 3/2$703

Find flights from Ontario to United Kingdom within your budget

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 marzo 3, 2025.

Fly from

Ontario

Fly to

United Kingdom

Route

Depart

Return

Price

OntarioManchester

ONT - MAN

ONTMAN

Ontario

mar. 4/1

10:57 am-1:10 pm

2 stops18h 13m

Manchester

mar. 4/8

7:55 am-9:58 pm

2 stops22h 03m

$590

OntarioLondon

ONT - LHR

ONTLHR

Ontario

dom. 3/16

12:46 pm-10:35 am

1 stop14h 49m

London Heathrow

mar. 4/1

10:55 am-4:34 pm

1 stop13h 39m

$592

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mar. 3/25

10:57 am-7:20 am

1 stop13h 23m

London Heathrow

mié. 4/2

3:10 pm-10:27 pm

1 stop15h 17m

$617

OntarioGlasgow

ONT - GLA

ONTGLA

Ontario

mié. 4/16

12:50 pm-3:35 pm

2 stops18h 45m

Glasgow Intl

vie. 4/25

7:00 am-6:20 pm

2 stops19h 20m

$623

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mar. 4/1

4:30 pm-12:50 pm

1 stop12h 20m

London Heathrow

mar. 4/8

3:40 pm-9:58 pm

1 stop14h 18m

$632

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mar. 4/8

1:30 pm-9:50 am

1 stop12h 20m

London Heathrow

mar. 4/15

11:30 am-10:36 pm

2 stops19h 06m

$640

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mar. 4/1

6:10 am-6:55 am

2 stops16h 45m

London Heathrow

mar. 4/8

7:25 am-5:51 pm

2 stops18h 26m

$652

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mar. 4/1

6:10 am-9:35 am

2 stops19h 25m

London Heathrow

mar. 4/8

5:40 pm-12:38 pm

2 stops26h 58m

$669

OntarioLondon

ONT - LHR

ONTLHR

Ontario

sáb. 3/29

12:46 pm-10:10 am

1 stop14h 24m

London Heathrow

mié. 4/9

11:00 am-4:33 pm

1 stop13h 33m

$699

OntarioManchester

ONT - MAN

ONTMAN

Ontario

dom. 8/24

7:00 am-8:35 am

1 stop17h 35m

Manchester

dom. 9/21

12:35 pm-10:29 pm

1 stop17h 54m

$701

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/3

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.

Travel insights for flights from Ontario to United Kingdom

Get recent, data-driven insights about flights from Ontario to United Kingdom including ideal travel times, pricing trends, and more.

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 $1,135). 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 marzo 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 marzo 3, 2025.
Get a feel of what it's like to fly with Delta, KLM and Air France 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
8,068 reviews

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

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
8,068 reviews
Delta
8.0
Very good
8,068 reviews

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

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
8,068 reviews

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

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.

Air France
7.4
Good
1,437 reviews
Delta
8.0
Very good
8,068 reviews

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

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
8,679 reviews
Delta
8.0
Very good
8,068 reviews

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

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
644 reviews
Delta
8.0
Very good
8,068 reviews

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

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 JetBlue, with whom users have recently found tickets for as low as $374. However, be on the lookout for offers from British Airways 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 $1,135). 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 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 marzo 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$454Average$889FlexibilityNo cancel feeOn-time72%
KLMCheapest$481Average$763FlexibilityNo cancel feeOn-time75%
DeltaCheapest$481Average$1,012FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$582Average$651FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$611Average$1,052FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$619Average$769FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$629Average$854FlexibilityNo cancel feeOn-time71%
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