HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$468+ 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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
Apr 7 — Apr 141
Mon 4/7
Mon 4/14
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 2, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$522
(TravelUp)

One-way from

$468
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$633
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 2, 2025.

This TravelUp 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/54:25 pmLHR - ONT
1 stop15h 11mBritish Airways
Fri 9/265:09 pmONT - LHR
1 stop13h 31mBritish Airways
Deal found 4/1$522
This flugladen.de 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1910:05 amLHR - ONT
2 stops18h 54mAlaska Airlines
Fri 5/22:44 pmONT - LHR
1 stop14h 01mAlaska Airlines
Deal found 4/1$538
This TravelUp 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/211:20 amLHR - ONT
1 stop16h 08mKLM
Fri 5/91:10 pmONT - LHR
1 stop12h 40mKLM
Deal found 4/1$541
This flugladen.de 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1911:15 amLHR - ONT
1 stop18h 43mFinnair
Fri 5/212:50 pmONT - LHR
1 stop14h 00mFinnair
Deal found 4/1$545
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/166:30 amLHR - ONT
2 stops19h 50mDelta
Fri 5/232:55 pmONT - LHR
1 stop15h 20mDelta
Deal found 4/1$550
This Bravofly 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 Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/195:25 pmLHR - ONT
2 stops31h 08mVirgin Atlantic
Fri 5/211:45 amONT - LHR
1 stop18h 30mVirgin Atlantic
Deal found 4/1$565
This TravelUp 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/810:00 amEDI - ONT
1 stop17h 42mKLM
Mon 9/2912:00 pmONT - EDI
1 stop16h 05mKLM
Deal found 4/1$607
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.
Fri 5/165:40 pmLHR - ONT
2 stops35h 13mUnited Airlines
Fri 5/235:10 amONT - LHR
2 stops17h 45mUnited Airlines
Deal found 4/1$620
This The Travel House 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/23:10 pmLHR - ONT
1 stop16h 19mIberia
Tue 9/163:00 pmONT - LHR
1 stop15h 25mIberia
Deal found 4/1$628
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/169:10 amEDI - ONT
2 stops21h 19mDelta
Fri 5/236:00 amONT - EDI
2 stops22h 35mDelta
Deal found 4/1$630
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1311:15 amLHR - ONT
1 stop18h 42mAmerican Airlines
Sat 6/284:50 pmONT - LHR
1 stop13h 50mAmerican Airlines
Deal found 4/1$635
This Netflights 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/206:00 amNCL - ONT
2 stops20h 20mBritish Airways
Tue 4/294:35 pmONT - NCL
2 stops19h 15mBritish Airways
Deal found 4/1$639

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 2, 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

Fri 9/5

4:25 pm-11:36 pm

1 stop15h 11m

Ontario

Fri 9/26

5:09 pm-2:40 pm

1 stop13h 31m

$522

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/19

10:05 am-8:59 pm

2 stops18h 54m

Ontario

Fri 5/2

2:44 pm-12:45 pm

1 stop14h 01m

$538

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 5/2

11:20 am-7:28 pm

1 stop16h 08m

Ontario

Fri 5/9

1:10 pm-9:50 am

1 stop12h 40m

$541

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/19

11:15 am-9:58 pm

1 stop18h 43m

Ontario

Fri 5/2

12:50 pm-10:50 am

1 stop14h 00m

$545

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 5/16

6:30 am-6:20 pm

2 stops19h 50m

Ontario

Fri 5/23

2:55 pm-2:15 pm

1 stop15h 20m

$550

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/19

5:25 pm-4:33 pm

2 stops31h 08m

Ontario

Fri 5/2

11:45 am-2:15 pm

1 stop18h 30m

$565

EdinburghOntario

EDI - ONT

EDIONT

Edinburgh Turnhouse

Mon 9/8

10:00 am-7:42 pm

1 stop17h 42m

Ontario

Mon 9/29

12:00 pm-12:05 pm

1 stop16h 05m

$607

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 5/16

5:40 pm-8:53 pm

2 stops35h 13m

Ontario

Fri 5/23

5:10 am-6:55 am

2 stops17h 45m

$620

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 9/2

3:10 pm-11:29 pm

1 stop16h 19m

Ontario

Tue 9/16

3:00 pm-2:25 pm

1 stop15h 25m

$628

EdinburghOntario

EDI - ONT

EDIONT

Edinburgh Turnhouse

Fri 5/16

9:10 am-10:29 pm

2 stops21h 19m

Ontario

Fri 5/23

6:00 am-12:35 pm

2 stops22h 35m

$630

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

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 2, 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 2, 2025.
To help decide which airline to fly from United Kingdom to Ontario, see what other customers have to say about Delta, Alaska Airlines and KLM. 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
7,898 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

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
7,898 reviews
Delta
8.0
Very good
7,898 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

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
Alaska Airlines
8.0
Very good
9,820 reviews
Delta
8.0
Very good
7,898 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

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
1,323 reviews
Delta
8.0
Very good
7,898 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

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
1,267 reviews
Delta
8.0
Very good
7,898 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

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
7.4
Good
1,425 reviews
Delta
8.0
Very good
7,898 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Overall

8.0

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 Iberia, with whom users have recently found tickets for as low as $530. However, be on the lookout for offers from Air France and Lufthansa, 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 London Gatwick - 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
Charles de Gaulle to San Francisco flights
Frankfurt to Los Angeles flights
Frankfurt to San Francisco flights
Orly to Los Angeles flights
Heathrow to San Francisco flights
Malpensa to Los Angeles flights
Frankfurt to Las Vegas flights
Vienna to Los Angeles flights
Barcelona-El Prat to Los Angeles flights
Heathrow to Las Vegas flights
Linate to Los Angeles flights
London City to Los Angeles flights
Madrid to Los Angeles flights
Munich to Los Angeles flights
Frederic Chopin to Los Angeles flights
Charles de Gaulle to Burbank flights
Zurich to Los Angeles flights
Beauvais-Tille to Los Angeles flights
Barcelona-El Prat to San Francisco flights
Orly to San Francisco flights
Munich to San Francisco flights
Frankfurt to Santa Ana flights
Leonardo da Vinci/Fiumicino to Los Angeles flights
Frankfurt to Ontario flights
Madrid to San Francisco flights
Amsterdam to Las Vegas flights
Charles de Gaulle to Las Vegas flights
Frankfurt to San Jose flights
London City to San Francisco flights
Gatwick to San Francisco flights
Gatwick to Las Vegas flights
Leonardo da Vinci/Fiumicino to San Francisco flights
Charles de Gaulle to Santa Ana flights
Amsterdam to San Francisco flights
Duesseldorf Intl to Las Vegas flights
Luton to Los Angeles flights
Heathrow to Ontario flights
Malpensa to Santa Ana flights
Barcelona-El Prat to Ontario flights
Zurich to San Francisco flights
Amsterdam to Los Angeles flights
London City to Las Vegas flights
Gatwick 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 2, 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.