HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$466+ Cheap flights from the United Kingdom to Ontario (ONT)

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 5/16. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from United Kingdom to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from United Kingdom to Ontario

Keep the following information in mind while searching for United Kingdom to Ontario flight deals. Data was last updated April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$543
(Netflights)

One-way from

$466
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$638
Provider with most accurate pricing for London (LON)-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Los Angeles flights.
Search Deals
From United Kingdom to Ontario
Search Deals
One-way flight from United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($72 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find flight deals from United Kingdom to Ontario

Cheapest flights from United Kingdom to Ontario
Explore the most affordable flight options available from United Kingdom to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.

This Netflights deal was found by Cheapflights users on 4/16. 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.
Thu 5/86:15 amLHR - ONT
2 stops25h 27mVirgin Atlantic
Fri 5/2311:44 amONT - LHR
1 stop18h 31mVirgin Atlantic
Deal found 4/16$543
This Booking.com deal was found by Cheapflights users on 4/16. 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.
Thu 4/243:10 pmLHR - ONT
1 stop15h 00mBritish Airways
Wed 5/72:44 pmONT - LHR
1 stop14h 01mBritish Airways
Deal found 4/16$552
This TravelUp deal was found by Cheapflights users on 4/16. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/39:20 amLHR - ONT
1 stop21h 16mKLM
Sat 5/1711:44 amONT - LHR
1 stop18h 31mKLM
Deal found 4/16$553
This Delta deal was found by Cheapflights users on 4/16. 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 4/2311:45 amLHR - ONT
2 stops19h 56mDelta
Wed 4/3012:07 pmONT - LHR
2 stops15h 18mDelta
Deal found 4/16$562
This United Airlines deal was found by Cheapflights users on 4/15. 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 5/147:30 amLHR - ONT
2 stops21h 23mUnited Airlines
Wed 5/211:45 pmONT - LHR
2 stops33h 55mUnited Airlines
Deal found 4/15$607
This Lufthansa deal was found by Cheapflights users on 4/15. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1410:35 amLHR - ONT
1 stop17h 59mMultiple Airlines
Wed 5/216:00 amONT - LHR
1 stop20h 25mMultiple Airlines
Deal found 4/15$632
This American Airlines deal was found by Cheapflights users on 4/17. 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.
Mon 9/83:40 pmLHR - ONT
1 stop14h 00mAmerican Airlines
Tue 9/165:09 pmONT - LHR
1 stop11h 41mAmerican Airlines
Deal found 4/17$642
This Air Canada deal was found by Cheapflights users on 4/16. 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 4/232:05 pmLHR - ONT
2 stops38h 37mAir Canada
Tue 4/295:00 amONT - LHR
2 stops17h 35mAir Canada
Deal found 4/16$643
This The Travel House deal was found by Cheapflights users on 4/17. 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/104:25 pmLHR - ONT
1 stop15h 11mIberia
Wed 9/1710:54 amONT - LHR
1 stop14h 06mIberia
Deal found 4/17$648
This United Airlines deal was found by Cheapflights users on 4/17. 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.
Thu 5/158:45 amLCY - ONT
2 stops19h 49mMultiple Airlines
Thu 5/221:36 pmONT - LCY
2 stops20h 59mMultiple Airlines
Deal found 4/17$690
This United Airlines deal was found by Cheapflights users on 4/16. 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 4/309:40 amEDI - ONT
2 stops20h 18mUnited Airlines
Wed 5/76:00 amONT - EDI
2 stops18h 05mUnited Airlines
Deal found 4/16$737
This Netflights deal was found by Cheapflights users on 4/17. 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.
Thu 9/47:00 amMAN - ONT
2 stops22h 40mBritish Airways
Fri 9/125:09 pmONT - MAN
2 stops20h 01mBritish Airways
Deal found 4/17$766

Cheapflights Fare Finder

Customize your flight search to find flights from United Kingdom to Ontario 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 17, 2025.
Use the filters below to find and compare flights from the United Kingdom to Ontario that are best for you.

Fly from

United Kingdom

Fly to

Ontario

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 5/8

6:15 am-11:42 pm

2 stops25h 27m

Ontario

Fri 5/23

11:44 am-2:15 pm

1 stop18h 31m

$543

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 5/3

9:20 am-10:36 pm

1 stop21h 16m

Ontario

Sat 5/17

11:44 am-2:15 pm

1 stop18h 31m

$553

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 9/19

10:30 am-5:40 pm

1 stop15h 10m

Ontario

Sat 9/27

5:09 pm-2:40 pm

1 stop13h 31m

$555

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 5/4

8:20 am-6:20 pm

2 stops18h 00m

Ontario

Wed 5/14

7:25 pm-7:45 pm

2 stops16h 20m

$557

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 5/3

6:30 am-10:57 pm

2 stops24h 27m

Ontario

Sat 5/17

7:05 am-9:15 am

2 stops18h 10m

$562

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 5/14

7:30 am-8:53 pm

2 stops21h 23m

Ontario

Wed 5/21

1:45 pm-7:40 am

2 stops33h 55m

$607

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 5/14

10:35 am-8:34 pm

1 stop17h 59m

Ontario

Wed 5/21

6:00 am-10:25 am

1 stop20h 25m

$632

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 9/8

3:40 pm-9:40 pm

1 stop14h 00m

Ontario

Tue 9/16

5:09 pm-12:50 pm

1 stop11h 41m

$642

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/10

4:25 pm-11:36 pm

1 stop15h 11m

Ontario

Wed 9/17

10:54 am-9:00 am

1 stop14h 06m

$648

LondonOntario

LCY - ONT

LCYONT

London City

Thu 5/15

8:45 am-8:34 pm

2 stops19h 49m

Ontario

Thu 5/22

1:36 pm-6:35 pm

2 stops20h 59m

$690

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from United Kingdom to Ontario

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

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

Currently, August is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of $246). Flying from United Kingdom to Ontario in March is currently the most expensive (average of $328). 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 GB to ONT?

Find hourly flight availability from United Kingdom to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 17, 2025.

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

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated April 17, 2025.
To help decide which airline to fly from United Kingdom to Ontario, see what other customers have to say about Delta, KLM and Finnair. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,917 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,329 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,269 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.5
Good
1,435 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,667 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

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

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

    The cheapest airline one-way is Lufthansa, with whom users have recently found tickets for as low as $476. However, be on the lookout for offers from Iberia and Air France, as they are both options that can get you from United Kingdom to Ontario for a low price.

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

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

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of $246). Flying from United Kingdom to Ontario in March is currently the most expensive (average of $328). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for United Kingdom to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Charles de Gaulle to Los Angeles flights
Heathrow to Los Angeles flights
Frankfurt to Los Angeles flights
Charles de Gaulle to San Francisco flights
Orly to Los Angeles flights
Heathrow to San Francisco flights
Frankfurt to San Francisco flights
Charles de Gaulle to Burbank flights
Malpensa to Los Angeles flights
Frankfurt to Las Vegas flights
Vienna to Los Angeles flights
Linate to Los Angeles flights
Madrid to Los Angeles flights
Heathrow to Las Vegas flights
Munich to Los Angeles flights
London City to Los Angeles flights
Orly to San Francisco flights
Frederic Chopin to Los Angeles flights
Frankfurt to Ontario flights
Charles de Gaulle to Long Beach flights
Charles de Gaulle to Las Vegas flights
Amsterdam to Los Angeles flights
Frankfurt to Santa Ana flights
Munich to San Francisco flights
Barcelona-El Prat to Los Angeles flights
Frankfurt to Long Beach flights
Charles de Gaulle to Santa Ana flights
Amsterdam to San Francisco flights
Malpensa to Santa Ana flights
Orly to Las Vegas flights
Zurich to Los Angeles flights
Gatwick to San Francisco flights
Barcelona-El Prat to San Francisco flights
London City to San Francisco flights
Madrid to San Francisco flights
Luton to Los Angeles flights
Heathrow to Ontario flights
Zurich to San Francisco flights
Gatwick to Los Angeles flights
Duesseldorf Intl to Los Angeles flights
Leonardo da Vinci/Fiumicino to San Francisco flights
Charles de Gaulle to Oakland flights
Gatwick to Las Vegas flights
Heathrow to Santa Ana flights
Istanbul to San Francisco flights
Beauvais-Tille to Los Angeles flights

Top airline flying from United Kingdom to Ontario

Discover the top airline that operate flights from United Kingdom to Ontario. 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 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$662Average$836FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.