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$375+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
may. 6 — may. 131
mar. 5/6
mar. 5/13
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 mayo 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$630
(World Air Fares)

One-way from

$375
(Netflights)

Popular in

December

Cheapest in

October

Average price

$711
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 ($53 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 May 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 mayo 1, 2025.

This World Air Fares deal was found by Cheapflights users on 4/30. 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.
mar. 9/231:15 pmONT - LHR
1 stop12h 25mLufthansa
vie. 10/242:50 pmLHR - ONT
1 stop13h 43mLufthansa
Deal found 4/30$630
This Expedia deal was found by Cheapflights users on 4/30. 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.
mar. 10/1410:55 amONT - LHR
1 stop14h 05mBritish Airways
vie. 10/243:40 pmLHR - ONT
1 stop14h 00mBritish Airways
Deal found 4/30$638
This oojo deal was found by Cheapflights users on 4/30. 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. 7/304:45 pmONT - EDI
2 stops18h 50mBritish Airways
mar. 8/197:00 amEDI - ONT
2 stops18h 52mBritish Airways
Deal found 4/30$639
This Air Canada deal was found by Cheapflights users on 4/30. 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.
dom. 8/175:05 amONT - LHR
2 stops20h 55mAir Canada
mié. 9/32:05 pmLHR - ONT
2 stops30h 27mAir Canada
Deal found 4/30$655
This United Airlines deal was found by Cheapflights users on 4/30. 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. 10/145:10 amONT - LHR
1 stop20h 30mUnited Airlines
vie. 10/245:40 pmLHR - ONT
2 stops36h 50mUnited Airlines
Deal found 4/30$662
This KLM deal was found by Cheapflights users on 4/30. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/159:55 amONT - LHR
1 stop15h 55mKLM
mié. 10/2912:30 pmLHR - ONT
1 stop17h 11mKLM
Deal found 4/30$678
This Air France deal was found by Cheapflights users on 4/30. 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.
mié. 10/159:55 amONT - LHR
1 stop15h 55mMultiple Airlines
mar. 10/2811:00 amLHR - ONT
2 stops18h 41mMultiple Airlines
Deal found 4/30$683
This Air France deal was found by Cheapflights users on 5/1. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/1512:00 pmONT - LHR
1 stop15h 10mAir France
mar. 10/2811:00 amLHR - ONT
2 stops18h 41mAir France
Deal found 5/1$684
This Delta deal was found by Cheapflights users on 4/30. 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.
mié. 9/101:00 pmONT - LHR
2 stops16h 10mDelta
sáb. 9/2011:45 amLHR - ONT
2 stops18h 56mDelta
Deal found 4/30$692
This United Airlines deal was found by Cheapflights users on 4/30. 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.
mié. 7/307:00 amONT - EDI
1 stop17h 25mUnited Airlines
mar. 8/199:00 amEDI - ONT
2 stops40h 29mUnited Airlines
Deal found 4/30$699
This oojo deal was found by Cheapflights users on 4/30. 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.
vie. 9/128:43 amONT - GLA
2 stops16h 52mBritish Airways
jue. 9/2511:30 amGLA - ONT
2 stops18h 10mBritish Airways
Deal found 4/30$705
This Orbitz deal was found by Cheapflights users on 4/30. 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.
lun. 7/1412:46 pmONT - LHR
1 stop17h 39mIberia
lun. 10/208:00 pmLHR - ONT
2 stops36h 02mIberia
Deal found 4/30$713

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 mayo 1, 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

mar. 9/23

1:15 pm-9:40 am

1 stop12h 25m

London Heathrow

vie. 10/24

2:50 pm-8:33 pm

1 stop13h 43m

$630

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mar. 10/14

10:55 am-9:00 am

1 stop14h 05m

London Heathrow

vie. 10/24

3:40 pm-9:40 pm

1 stop14h 00m

$638

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

mié. 7/30

4:45 pm-7:35 pm

2 stops18h 50m

Edinburgh Turnhouse

mar. 8/19

7:00 am-5:52 pm

2 stops18h 52m

$639

OntarioLondon

ONT - LHR

ONTLHR

Ontario

dom. 8/17

5:05 am-10:00 am

2 stops20h 55m

London Heathrow

mar. 9/2

9:30 am-12:32 pm

2 stops35h 02m

$655

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mar. 10/14

5:10 am-9:40 am

1 stop20h 30m

London Heathrow

vie. 10/24

5:40 pm-10:30 pm

2 stops36h 50m

$662

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mié. 10/15

9:55 am-9:50 am

1 stop15h 55m

London Heathrow

mié. 10/29

12:30 pm-10:41 pm

1 stop17h 11m

$678

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mié. 10/15

9:55 am-9:50 am

1 stop15h 55m

London Heathrow

mar. 10/28

11:00 am-10:41 pm

2 stops18h 41m

$683

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mié. 10/15

12:00 pm-11:10 am

1 stop15h 10m

London Heathrow

mar. 10/28

11:00 am-10:41 pm

2 stops18h 41m

$684

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mié. 9/10

12:00 pm-11:10 am

1 stop15h 10m

London Heathrow

sáb. 9/20

11:45 am-11:46 pm

2 stops20h 01m

$692

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

mié. 7/30

7:00 am-8:25 am

1 stop17h 25m

Edinburgh Turnhouse

mar. 8/19

9:00 am-5:29 pm

2 stops40h 29m

$699

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

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 $1,103). 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 mayo 1, 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 mayo 1, 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
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

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
7,934 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

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
1,334 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

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.
Air France
7.4
Good
1,446 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

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
8,696 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

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
643 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

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 Virgin Atlantic, with whom users have recently found tickets for as low as $375. However, be on the lookout for offers from British Airways and Iberia, 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 $1,103). 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 mayo 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$454Average$806FlexibilityNo cancel feeOn-time72%
IberiaCheapest$582Average$670FlexibilityNo cancel feeOn-time77%
DeltaCheapest$610Average$1,076FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$611Average$921FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$629Average$769FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$632Average$1,038FlexibilityNo cancel feeOn-time71%

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