What are the cheapest airlines flying from London Heathrow Airport to Ontario round-trip?

Flying on British Airways is currently your cheapest option to Ontario, with prices starting at $505. Additional round-trip tickets that might be worth considering are offered by KLM and American Airlines, with the lowest prices starting at $514 and $518, respectively. These flights start at 30% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from London Heathrow Airport to Ontario one-way?

To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at $483. Iberia flights start at $559 while deals on Delta start at $580 one-way.

What is the cheapest day to fly from London Heathrow Airport to Ontario?

Travelers seeking maximum savings on their London Heathrow Airport to Ontario flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

What is the cheapest day to fly round-trip from London Heathrow Airport to Ontario?

Sunday flights are found to be more expensive to fly from London Heathrow Airport to Ontario. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ontario.

How far in advance should I book a flight from London Heathrow Airport to Ontario?

Find a great deal and save up to 28% by booking at least 8 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from London Heathrow Airport to Ontario within the next two weeks, with the cheapest ticket starting at $588.

What is the cheapest month to fly from London Heathrow Airport to Ontario?

February is one of the best times of the year to fly to Ontario from London Heathrow Airport. Prices for February average $660 per person but you can even find prices for as low as $471. The most expensive prices can be found in the month of August. Opting for a February flight can save you 25% on your journey compared to booking in August

Most accurate provider : When it comes to deals on London Heathrow Airport-Ontario flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on London Heathrow Airport-Ontario flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Ontario flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on London Heathrow Airport-Ontario flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly into for flights to Ontario from London Heathrow?

Ontario (ONT) is the airport you will fly into if you book a flight from London Heathrow to Ontario. You should not have trouble finding flights to Ontario from London Heathrow; the airport handles an average of 0 inbound flights from London Heathrow per day. You should also have plenty of airline options to choose from since 1 airline has flights to the Ontario airport from London Heathrow. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

Can I find deals for flights from Heathrow to Ontario that include hotel bookings?

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

How can I find direct flights from Heathrow to Ontario?

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

Can I find deals for business class flights from Heathrow to Ontario?

Yes. Cheapflights offers flight deals from Heathrow 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.

$483+ Flights from London Heathrow Airport to Ontario - Compare & Save Big

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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

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Cheapflights Tip: The best prices from London Heathrow to Ontario are usually found in February or September, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Heathrow to Ontario

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$505 (Netflights)
One-way from	$483 (British Airways)
Popular in	August
Cheapest in	February
Average price	$702

Provider with most accurate pricing for London Heathrow-Ontario flight deals.

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Provider most trusted by Cheapflights users for London Heathrow-Ontario flights.

Search Deals

From London Heathrow to Ontario

Search Deals

One-way flight from London Heathrow to Ontario

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($51 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in May 2025

Search Deals

Find flight deals from Heathrow to Ontario

Cheapest flights from Heathrow to Ontario
Explore the most affordable flight options available from Heathrow to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 15, 2025.

Mon 11/246:30 amLHR - ONT

2 stops23h 30mBritish Airways

Fri 12/53:05 pmONT - LHR

1 stop13h 10mBritish Airways

Deal found 5/14

$496

Wed 11/1212:30 pmLHR - ONT

1 stop18h 11mKLM

Wed 12/312:00 pmONT - LHR

1 stop15h 40mKLM

Deal found 5/14

$513

Thu 9/253:40 pmLHR - ONT

1 stop14h 00mAmerican Airlines

Tue 10/75:02 pmONT - LHR

1 stop13h 38mAmerican Airlines

Deal found 5/14

$518

Mon 11/246:30 amLHR - ONT

2 stops24h 12mDelta

Fri 12/56:00 amONT - LHR

2 stops22h 15mDelta

Deal found 5/15

$524

Tue 6/32:45 pmLHR - ONT

2 stops40h 57mVirgin Atlantic

Mon 6/96:25 amONT - LHR

1 stop20h 55mVirgin Atlantic

Deal found 5/14

$530

Wed 9/174:25 pmLHR - ONT

1 stop15h 11mFinnair

Thu 9/253:00 pmONT - LHR

1 stop13h 30mFinnair

Deal found 5/15

$540

Fri 7/113:10 pmLHR - ONT

1 stop15h 47mRoyal Air Maroc

Sat 7/198:15 amONT - LHR

1 stop14h 10mRoyal Air Maroc

Deal found 5/14

$592

Sat 7/124:25 pmLHR - ONT

1 stop15h 29mIberia

Sun 7/206:10 amONT - LHR

1 stop16h 15mIberia

Deal found 5/15

$594

Wed 6/119:30 amLHR - ONT

2 stops19h 40mUnited Airlines

Thu 9/181:42 pmONT - LHR

1 stop12h 43mUnited Airlines

Deal found 5/14

$631

Wed 6/112:05 pmLHR - ONT

3 stops30h 26mMultiple Airlines

Thu 9/187:00 amONT - LHR

2 stops17h 35mMultiple Airlines

Deal found 5/14

$652

Wed 9/248:15 amLHR - ONT

1 stop21h 26mJetBlue

Mon 10/611:00 pmONT - LHR

1 stop13h 45mJetBlue

Deal found 5/14

$715

Thu 6/52:10 pmLHR - ONT

2 stops40h 35mAir Canada

Wed 7/165:05 amONT - LHR

2 stops17h 25mAir Canada

Deal found 5/14

$782

Best flights from Heathrow to Ontario
Discover carefully curated flight deals from Heathrow to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 15, 2025.

Tue 6/38:20 amLHR - ONT

1 stop18h 16mBritish Airways

Mon 6/912:49 pmONT - LHR

1 stop15h 56mBritish Airways

Deal found 5/14

$505

Mon 9/811:20 amLHR - ONT

1 stop16h 22mKLM

Mon 9/151:00 pmONT - LHR

1 stop12h 50mKLM

Deal found 5/14

$514

Thu 9/253:40 pmLHR - ONT

1 stop14h 00mAmerican Airlines

Tue 10/75:02 pmONT - LHR

1 stop13h 38mAmerican Airlines

Deal found 5/14

$518

Tue 6/32:45 pmLHR - ONT

2 stops40h 57mVirgin Atlantic

Mon 6/96:25 amONT - LHR

1 stop20h 55mVirgin Atlantic

Deal found 5/14

$530

Thu 6/59:55 amLHR - ONT

2 stops20h 40mDelta

Wed 7/1610:05 pmONT - LHR

1 stop31h 25mDelta

Deal found 5/14

$536

Wed 9/174:25 pmLHR - ONT

1 stop15h 11mFinnair

Thu 9/253:00 pmONT - LHR

1 stop13h 30mFinnair

Deal found 5/15

$540

Sat 7/124:25 pmLHR - ONT

1 stop15h 29mIberia

Sun 7/206:10 amONT - LHR

1 stop16h 15mIberia

Deal found 5/15

$594

Wed 6/119:30 amLHR - ONT

2 stops19h 40mUnited Airlines

Thu 9/181:42 pmONT - LHR

1 stop12h 43mUnited Airlines

Deal found 5/14

$631

Wed 6/112:05 pmLHR - ONT

3 stops30h 26mMultiple Airlines

Thu 9/187:00 amONT - LHR

2 stops17h 35mMultiple Airlines

Deal found 5/14

$652

Wed 9/248:15 amLHR - ONT

1 stop21h 26mJetBlue

Mon 10/611:00 pmONT - LHR

1 stop13h 45mJetBlue

Deal found 5/14

$715

Thu 6/52:10 pmLHR - ONT

2 stops40h 35mAir Canada

Wed 7/165:05 amONT - LHR

2 stops17h 25mAir Canada

Deal found 5/14

$782

Tue 6/108:15 amLHR - ONT

1 stop20h 55mIcelandair

Sat 6/1411:59 pmONT - LHR

1 stop25h 31mIcelandair

Deal found 5/14

$816

Last-minute flights from Heathrow to Ontario
Discover last-minute flight deals from Heathrow to Ontario. Data last updated May 15, 2025 and is based on user searches.

Sun 5/184:25 pmLHR - ONT

1 stop15h 18mFinnair

Sat 5/242:44 pmONT - LHR

1 stop14h 01mFinnair

Deal found 5/14

$1,321

Wed 5/218:15 amLHR - ONT

1 stop20h 56mJetBlue

Wed 5/2810:59 pmONT - LHR

1 stop13h 46mJetBlue

Deal found 5/14

$896

Thu 5/228:20 amLHR - ONT

1 stop18h 16mIberia

Tue 6/1010:54 amONT - LHR

1 stop15h 56mIberia

Deal found 5/14

$737

Thu 5/222:50 pmLHR - ONT

1 stop14h 14mMultiple Airlines

Wed 6/41:36 pmONT - LHR

1 stop12h 49mMultiple Airlines

Deal found 5/15

$1,012

Thu 5/223:40 pmLHR - ONT

1 stop14h 17mAmerican Airlines

Fri 6/64:50 pmONT - LHR

1 stop12h 00mAmerican Airlines

Deal found 5/15

$1,057

Fri 5/2311:20 amLHR - ONT

1 stop16h 13mKLM

Tue 7/81:15 pmONT - LHR

1 stop12h 35mKLM

Deal found 5/14

$529

Fri 5/2310:35 amLHR - ONT

1 stop15h 03mUnited Airlines

Fri 9/191:42 pmONT - LHR

1 stop12h 43mUnited Airlines

Deal found 5/15

$960

Fri 5/2310:05 pmLHR - ONT

2 stops31h 50mAvianca

Sun 6/1511:25 pmONT - LHR

2 stops32h 10mAvianca

Deal found 5/15

$2,286

Sun 5/2511:15 amLHR - ONT

1 stop15h 08mBritish Airways

Sat 7/54:45 pmONT - LHR

1 stop12h 05mBritish Airways

Deal found 5/14

$532

Sun 5/2510:55 amLHR - ONT

1 stop13h 22mVirgin Atlantic

Mon 6/3011:25 amONT - LHR

1 stop15h 55mVirgin Atlantic

Deal found 5/14

$576

Tue 6/38:20 amLHR - ONT

1 stop18h 16mBritish Airways

Mon 6/912:49 pmONT - LHR

1 stop15h 56mBritish Airways

Deal found 5/14

$505

Tue 6/32:45 pmLHR - ONT

2 stops40h 57mVirgin Atlantic

Mon 6/96:25 amONT - LHR

1 stop20h 55mVirgin Atlantic

Deal found 5/14

$530

One-way flights from Heathrow to Ontario
Search for one-way flight options from Heathrow to Ontario. Find affordable one-way fares based on user searches. Data last updated May 15, 2025.

Thu 6/123:40 pmLHR - ONT

1 stop13h 58mBritish Airways

Deal found 5/15

$483

Wed 8/68:50 pmLHR - ONT

3 stops54h 24mMultiple Airlines

Deal found 5/15

$503

Mon 7/143:10 pmLHR - ONT

1 stop14h 58mIberia

Deal found 5/15

$559

Wed 8/139:35 amLHR - ONT

2 stops20h 54mDelta

Deal found 5/15

$580

Fri 6/610:00 amLHR - ONT

1 stop19h 10mLufthansa

Deal found 5/14

$707

Sat 8/97:30 pmLHR - ONT

2 stops30h 55mAmerican Airlines

Deal found 5/15

$714

Tue 6/33:10 pmLHR - ONT

1 stop16h 33mFinnair

Deal found 5/15

$733

Wed 9/108:15 amLHR - ONT

1 stop21h 26mJetBlue

Deal found 5/14

$777

Wed 9/1711:45 amLHR - ONT

2 stops20h 01mVirgin Atlantic

Deal found 5/14

$828

Wed 9/1711:20 amLHR - ONT

1 stop16h 22mKLM

Deal found 5/14

$861

Wed 9/171:05 pmLHR - ONT

1 stop17h 36mAir France

Deal found 5/15

$865

Mon 6/210:05 pmLHR - ONT

2 stops31h 50mAvianca

Deal found 5/15

$946

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 6/3

8:20 am-6:36 pm

1 stop18h 16m

Ontario

Mon 6/9

12:49 pm-12:45 pm

1 stop15h 56m

$505

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 9/8

11:20 am-7:42 pm

1 stop16h 22m

Ontario

Mon 9/15

1:00 pm-9:50 am

1 stop12h 50m

$514

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/25

3:40 pm-9:40 pm

1 stop14h 00m

Ontario

Tue 10/7

5:02 pm-2:40 pm

1 stop13h 38m

$518

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 6/3

2:45 pm-11:42 pm

2 stops40h 57m

Ontario

Mon 6/9

6:25 am-11:20 am

1 stop20h 55m

$530

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 6/5

9:55 am-10:35 pm

2 stops20h 40m

Ontario

Wed 7/16

10:05 pm-1:30 pm

1 stop31h 25m

$536

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/17

4:25 pm-11:36 pm

1 stop15h 11m

Ontario

Thu 9/25

3:00 pm-12:30 pm

1 stop13h 30m

$540

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 7/11

3:10 pm-10:57 pm

1 stop15h 47m

Ontario

Sat 7/19

8:15 am-6:25 am

1 stop14h 10m

$592

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/12

4:25 pm-11:54 pm

1 stop15h 29m

Ontario

Sun 7/20

6:10 am-6:25 am

1 stop16h 15m

$594

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 6/11

9:30 am-9:10 pm

2 stops19h 40m

Ontario

Thu 9/18

1:42 pm-10:25 am

1 stop12h 43m

$631

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 6/11

2:05 pm-12:31 pm

3 stops30h 26m

Ontario

Thu 9/18

7:00 am-8:35 am

2 stops17h 35m

$652

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/15

Showing 1-10 of 26 results

Compare providers for flights from Heathrow to Ontario

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Ontario in May.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on London Heathrow Airport-Ontario flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on London Heathrow Airport-Ontario flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Ontario flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on London Heathrow Airport-Ontario flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Heathrow to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Heathrow 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 London Heathrow Airport to Ontario

How far ahead should I book a flight from London Heathrow Airport to Ontario?

Booking 37 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from London Heathrow Airport to Ontario?

Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of $246). Flying from London Heathrow Airport 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 LHR to ONT?

Unlike at noon, when flights are generally more expensive, you can save up to 23% on flights from London Heathrow Airport to Ontario by exploring options for tickets in the afternoon.

Rainfall in Ontario 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

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

Read through reviews of airlines operating flights from London to Ontario, such as Delta, KLM and Finnair. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,946 reviews

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

7,946 reviews

Delta

8.0

Very good

7,946 reviews

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

1,344 reviews

Delta

8.0

Very good

7,946 reviews

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

1,279 reviews

Delta

8.0

Very good

7,946 reviews

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

1,451 reviews

Delta

8.0

Very good

7,946 reviews

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

8,731 reviews

Delta

8.0

Very good

7,946 reviews

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

What airport do you fly into for flights to Ontario from London Heathrow?
Ontario (ONT) is the airport you will fly into if you book a flight from London Heathrow to Ontario. You should not have trouble finding flights to Ontario from London Heathrow; the airport handles an average of 0 inbound flights from London Heathrow per day. You should also have plenty of airline options to choose from since 1 airline has flights to the Ontario airport from London Heathrow. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.
What are the cheapest airlines flying from London Heathrow Airport to Ontario round-trip?
Flying on British Airways is currently your cheapest option to Ontario, with prices starting at $505. Additional round-trip tickets that might be worth considering are offered by KLM and American Airlines, with the lowest prices starting at $514 and $518, respectively. These flights start at 30% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from London Heathrow Airport to Ontario one-way?
To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at $483. Iberia flights start at $559 while deals on Delta start at $580 one-way.
Can I find deals for flights from Heathrow to Ontario that include hotel bookings?
Yes. In addition to deals on Heathrow to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Heathrow to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Ontario.
Can I find deals for business class flights from Heathrow to Ontario?
Yes. Cheapflights offers flight deals from Heathrow 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 London Heathrow Airport to Ontario?
Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of $246). Flying from London Heathrow Airport 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

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Other flights to Ontario

Top airline flying from Heathrow to Ontario

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$560	Average$694	FlexibilityNo cancel fee	On-time69%

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$483+ Cheap flights from Heathrow (LHR) 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 6/12. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Heathrow to Ontario with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from London Heathrow to Ontario are usually found in February or September, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Heathrow to Ontario

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Heathrow to Ontario

Cheapest flights from Heathrow to OntarioExplore the most affordable flight options available from Heathrow to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 15, 2025.

Explore the most affordable flight options available from Heathrow to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 15, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Ontario that are best for you.

Compare providers for flights from Heathrow to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Ontario in May.

Best time to book a flight from Heathrow to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Heathrow with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Ontario

How far ahead should I book a flight from London Heathrow Airport to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Heathrow to Ontario. Price data was last updated on May 9, 2025.

What is the cheapest month to book a flight from London Heathrow Airport to Ontario?

What is the cheapest time of day to fly from LHR to ONT?

Find hourly flight availability from Heathrow 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 May 15, 2025.

Rainfall in Ontario by month

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

Temperature in Ontario by month

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

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from London to Ontario, such as Delta, KLM and Finnair. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Heathrow 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 London Heathrow?

What are the cheapest airlines flying from London Heathrow Airport to Ontario round-trip?

What are the cheapest airlines to fly from London Heathrow Airport to Ontario one-way?

Can I find deals for flights from Heathrow to Ontario that include hotel bookings?

How can I find direct flights from Heathrow to Ontario?

Can I find deals for business class flights from Heathrow to Ontario?

What is the cheapest month to book a flight from London Heathrow Airport to Ontario?

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Alternative routes for Heathrow to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

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Cheapest flights from Heathrow to Ontario
Explore the most affordable flight options available from Heathrow to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 15, 2025.