Cheap flights from Ontario (ONT) to Heathrow (LHR) from $459

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 3/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — LHR
feb. 26 — mar. 41

The best prices from Ontario to London Heathrow are usually found in February or January, booked 46 days in advance, depart on a Thursday or Sunday and return on a Tuesday

Cheap flight deals from Ontario to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated febrero 21, 2024.

Popular in

July

Cheapest in

February

Round-trip from

$642

One-way from

$595
High demand for flights, 28% potential price rise
Best time to find cheap flights, 27% potential price drop
From Ontario to London Heathrow
One-way flight from Ontario to London Heathrow

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

Thursday flights are generally found to be more expensive for flights from Ontario to London Heathrow Airport. 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 London Heathrow Airport.

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

Find a great deal and save up to 58% by booking at least 59 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 Ontario to London Heathrow Airport within the next two weeks, with the cheapest ticket starting at $896.

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

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, October can be a great choice for travel to London Heathrow Airport. Flights to London Heathrow Airport from Ontario in October are about $787 on average during October, but can be found for as low as $419.

When is the cheapest time to fly from Ontario to London Heathrow Airport (ONT - LHR)?

It’s typically best to fly out from Ontario to London Heathrow Airport at noon. Doing so could potentially save you 18% on the flight price compared to flying in the evening, which is usually more expensive.

Cheap United Airlines flights from Ontario to Heathrow

Explore cheap flight options specifically provided by United Airlines for the route between Ontario and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,436,117 searches. Data last updated febrero 21, 2024.
Consider these cheap United Airlines flights we've found departing from Ontario to London. Be sure to come back soon if the deals available don't appeal to you at this time.
mar. 3/196:00 amONT - LHR
3 stops22h 15mUnited Airlines
mar. 3/261:25 pmLHR - ONT
2 stops38h 32mUnited Airlines
Deal found 2/20$647
mar. 4/231:36 pmONT - LHR
1 stop12h 04mUnited Airlines
mar. 4/303:50 pmLHR - ONT
2 stops28h 50mUnited Airlines
Deal found 2/20$655
mar. 4/231:36 pmONT - LHR
1 stop12h 04mUnited Airlines
mar. 4/301:30 pmLHR - ONT
2 stops17h 34mUnited Airlines
Deal found 2/21$656
lun. 3/186:22 pmONT - LHR
1 stop30h 08mUnited Airlines
lun. 3/251:30 pmLHR - ONT
2 stops39h 31mUnited Airlines
Deal found 2/21$663
sáb. 3/96:42 pmONT - LHR
1 stop28h 48mUnited Airlines
vie. 4/124:15 pmLHR - ONT
1 stop25h 47mUnited Airlines
Deal found 2/21$671
mar. 3/125:15 amONT - LHR
2 stops18h 15mUnited Airlines
vie. 4/1210:25 amLHR - ONT
1 stop20h 39mUnited Airlines
Deal found 2/21$677
sáb. 4/201:36 pmONT - LHR
2 stops32h 19mUnited Airlines
vie. 5/32:50 pmLHR - ONT
1 stop14h 03mUnited Airlines
Deal found 2/20$685
dom. 3/175:15 amONT - LHR
2 stops23h 00mUnited Airlines
dom. 3/248:30 amLHR - ONT
2 stops40h 11mUnited Airlines
Deal found 2/20$696
dom. 3/1710:40 amONT - LHR
1 stop13h 50mUnited Airlines
dom. 3/241:45 pmLHR - ONT
1 stop15h 16mUnited Airlines
Deal found 2/21$710

Cheap Air Canada flights from Ontario to Heathrow

Explore cheap flight options specifically provided by Air Canada for the route between Ontario and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,436,117 searches. Data last updated febrero 21, 2024.
Browse through some of the cheapest Air Canada flights traveling from Ontario to London. Deals frequently update to provide users with more options.
mar. 4/231:36 pmONT - LHR
2 stops32h 54mAir Canada
mar. 4/303:50 pmLHR - ONT
2 stops28h 50mAir Canada
Deal found 2/20$660
vie. 3/296:00 amONT - LHR
2 stops22h 50mAir Canada
vie. 4/58:30 amLHR - ONT
2 stops22h 34mAir Canada
Deal found 2/19$930
lun. 2/265:23 amONT - LHR
2 stops17h 47mAir Canada
vie. 3/16:00 pmLHR - ONT
2 stops34h 49mAir Canada
Deal found 2/21$1,176

Cheap Ontario to Heathrow flights in February & March 2024

Find cheap flight options from Ontario to Heathrow specifically for the months of February and March 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,436,117 searches. Prices were last updated on febrero 21, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to London in 2024. For more flight deals, be sure to check back very soon.
mar. 3/196:00 amONT - LHR
3 stops22h 15mUnited Airlines
mar. 3/261:25 pmLHR - ONT
2 stops38h 32mUnited Airlines
Deal found 2/20$647
lun. 3/1110:40 amONT - LHR
1 stop13h 50mUnited Airlines
mié. 3/279:20 amLHR - ONT
1 stop15h 21mUnited Airlines
Deal found 2/21$662
lun. 3/186:22 pmONT - LHR
2 stops28h 33mUnited Airlines
lun. 3/251:30 pmLHR - ONT
2 stops39h 31mUnited Airlines
Deal found 2/21$663
mié. 3/136:00 amONT - LHR
1 stop17h 20mAmerican Airlines
mié. 4/109:15 amLHR - ONT
1 stop19h 27mAmerican Airlines
Deal found 2/21$669
mar. 3/197:00 amONT - LHR
1 stop17h 15mVirgin Atlantic
mar. 3/2612:20 pmLHR - ONT
1 stop18h 26mVirgin Atlantic
Deal found 2/20$670
sáb. 3/96:42 pmONT - LHR
1 stop28h 48mUnited Airlines
vie. 4/124:15 pmLHR - ONT
1 stop25h 47mUnited Airlines
Deal found 2/21$671
mié. 3/1311:01 amONT - LHR
2 stops15h 14mAmerican Airlines
mié. 4/109:15 amLHR - ONT
1 stop19h 27mAmerican Airlines
Deal found 2/21$672
mar. 3/197:00 amONT - LHR
2 stops18h 30mVirgin Atlantic
mar. 3/2612:20 pmLHR - ONT
2 stops18h 26mVirgin Atlantic
Deal found 2/20$674
mié. 3/1310:19 amONT - LHR
2 stops14h 31mAmerican Airlines
mié. 4/101:00 pmLHR - ONT
2 stops16h 56mAmerican Airlines
Deal found 2/21$675

Ontario to Heathrow 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Heathrow in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,436,117 searches. Data last updated febrero 21, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to London in 2024. For more flight deals, be sure to check back very soon.
mar. 3/196:00 amONT - LHR
3 stops22h 15mUnited Airlines
mar. 3/261:25 pmLHR - ONT
2 stops38h 32mUnited Airlines
Deal found 2/20$647
mar. 4/231:36 pmONT - LHR
1 stop12h 04mUnited Airlines
mar. 4/303:50 pmLHR - ONT
2 stops28h 50mUnited Airlines
Deal found 2/20$655
mar. 4/231:36 pmONT - LHR
1 stop12h 04mUnited Airlines
mar. 4/301:30 pmLHR - ONT
2 stops17h 34mUnited Airlines
Deal found 2/21$656
mar. 4/231:36 pmONT - LHR
2 stops32h 54mAir Canada
mar. 4/303:50 pmLHR - ONT
2 stops28h 50mAir Canada
Deal found 2/20$660
lun. 3/1110:40 amONT - LHR
1 stop13h 50mUnited Airlines
mié. 3/279:20 amLHR - ONT
1 stop15h 21mUnited Airlines
Deal found 2/21$662
lun. 3/186:22 pmONT - LHR
2 stops28h 33mUnited Airlines
lun. 3/251:30 pmLHR - ONT
2 stops39h 31mUnited Airlines
Deal found 2/21$663
mié. 3/136:00 amONT - LHR
1 stop17h 20mAmerican Airlines
mié. 4/109:15 amLHR - ONT
1 stop19h 27mAmerican Airlines
Deal found 2/21$669
mar. 3/197:00 amONT - LHR
1 stop17h 15mVirgin Atlantic
mar. 3/2612:20 pmLHR - ONT
1 stop18h 26mVirgin Atlantic
Deal found 2/20$670
sáb. 3/96:42 pmONT - LHR
1 stop28h 48mUnited Airlines
vie. 4/124:15 pmLHR - ONT
1 stop25h 47mUnited Airlines
Deal found 2/21$671

Ontario to Heathrow flights leaving soon

Find last-minute flight options from Ontario to Heathrow for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,436,117 searches. Data last updated febrero 21, 2024.
Have a look at some of the flights available from Ontario to London departing last-minute. Tip: verify your flight details before completing your reservation.
mié. 2/287:18 amONT - LHR
1 stop18h 27mAmerican Airlines
mar. 3/59:50 amLHR - ONT
2 stops18h 55mAmerican Airlines
Deal found 2/20$886
mié. 2/2810:19 amONT - LHR
2 stops14h 56mAmerican Airlines
mar. 3/59:50 amLHR - ONT
2 stops18h 55mAmerican Airlines
Deal found 2/20$889
mié. 2/286:00 amONT - LHR
2 stops17h 55mUnited Airlines
mar. 3/129:30 amLHR - ONT
2 stops19h 31mUnited Airlines
Deal found 2/21$894
mar. 2/277:18 amONT - LHR
1 stop15h 02mIberia
jue. 3/76:20 amLHR - ONT
2 stops22h 25mIberia
Deal found 2/20$899
mié. 2/281:38 pmONT - LHR
1 stop12h 02mUnited Airlines
jue. 3/141:45 pmLHR - ONT
1 stop15h 16mUnited Airlines
Deal found 2/21$908
mié. 2/286:00 amONT - LHR
1 stop17h 30mUnited Airlines
mar. 4/22:50 pmLHR - ONT
1 stop13h 50mUnited Airlines
Deal found 2/21$909
lun. 2/2611:01 amONT - LHR
1 stop17h 04mIberia
mié. 3/139:25 amLHR - ONT
1 stop18h 21mIberia
Deal found 2/19$916
mié. 2/287:18 amONT - LHR
1 stop15h 02mBritish Airways
mar. 3/129:25 amLHR - ONT
1 stop15h 51mBritish Airways
Deal found 2/20$917
mié. 2/281:38 pmONT - LHR
1 stop12h 02mUnited Airlines
mar. 4/22:50 pmLHR - ONT
1 stop13h 50mUnited Airlines
Deal found 2/20$918

One-way flights to Heathrow from Ontario

Search for one-way flight options from Ontario to Heathrow. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,436,117 searches. Data last updated febrero 21, 2024.
Users in need of a one-way flight from Ontario to London can choose from these deals. Users in need of a round-trip flight from Ontario to London instead should update the search form at the top of page.
mié. 3/275:15 amONT - LHR
1 stop21h 25mUnited Airlines
Deal found 2/21$459
dom. 3/2410:40 amONT - LHR
1 stop18h 20mUnited Airlines
Deal found 2/21$460
mar. 3/126:00 amONT - LHR
2 stops20h 40mUnited Airlines
Deal found 2/20$463
sáb. 3/306:42 pmONT - LHR
1 stop31h 43mUnited Airlines
Deal found 2/21$464
sáb. 3/236:42 pmONT - LHR
1 stop34h 18mUnited Airlines
Deal found 2/20$475
sáb. 3/232:50 pmONT - LHR
1 stop32h 30mIberia
Deal found 2/21$493
mar. 7/306:00 amONT - LHR
2 stops20h 40mUnited Airlines
Deal found 2/20$495
mié. 5/81:36 pmONT - LHR
1 stop12h 04mUnited Airlines
Deal found 2/21$496
mar. 7/161:35 pmONT - LHR
1 stop12h 50mUnited Airlines
Deal found 2/20$499

Find flights from Ontario to Heathrow within your budget

Customize your flight search to find flights from Ontario to Heathrow 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 3,436,117 searches. Data last updated febrero 21, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$647 - $751

Route

Depart

Return

Price

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

mar. 3/19

3 stops22h 15m

London Heathrow

mar. 3/26

2 stops38h 32m

$647

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

mar. 4/23

2 stops32h 54m

London Heathrow

mar. 4/30

2 stops28h 50m

$660

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

mié. 3/13

1 stop17h 20m

London Heathrow

mié. 4/10

1 stop19h 27m

$669

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

mar. 3/19

1 stop17h 15m

London Heathrow

mar. 3/26

1 stop18h 26m

$670

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

sáb. 4/20

1 stop33h 33m

London Heathrow

vie. 5/3

1 stop19h 57m

$676

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

lun. 3/18

1 stop23h 21m

London Heathrow

mar. 3/26

2 stops38h 11m

$680

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

mar. 3/19

3 stops18h 55m

London Heathrow

mar. 3/26

2 stops27h 59m

$681

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

lun. 3/11

1 stop15h 32m

London Heathrow

mié. 4/10

2 stops37h 22m

$707

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

sáb. 4/20

2 stops17h 30m

London Heathrow

vie. 5/3

2 stops21h 21m

$751

Flights are sorted by cheapest first

Deals found on 2/20

When is the best time to book a flight from Ontario to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Heathrow. Price data was last updated on January 28, 2024.
The price you pay for your flight from Ontario to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 46 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Search Deals

When is the cheapest time to fly from Ontario to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Heathrow. Price data was last updated on February 18, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ontario to London Heathrow Airport flight should consider departing on Thursday mornings when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Heathrow by month

Plan your trip from Ontario to Heathrow by taking into account the cheapest months to travel. The average price of a one-way flight from Ontario to Heathrow is currently $478 while a round-trip flight costs $682. Price data was last updated on February 18, 2024.

Currently, November is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of $652). Flying from Ontario to London Heathrow Airport in June is currently the most expensive (average of $1,187). 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.

January

$675

February

$665

March

$710

April

$737

May

$769

June

$1,187

July

$1,017

August

$801

September

$751

October

$717

November

$652

December

$676

Temperature and rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature and rainfall totals by month.

LON

Temperature

39.2 - 62.6 °F

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated febrero 21, 2024.
See what other customers who have flown with United Airlines, Air Canada and Virgin Atlantic from Ontario to London have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very good
11,936 reviews

Entertainment

8.1

Overall

8.1

Boarding

8.2

Food

7.5

Crew

8.6

Comfort

7.9

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

8.1
Very good
11,936 reviews
8.1
Very good
11,936 reviews

Entertainment

8.1

Overall

8.1

Boarding

8.2

Food

7.5

Crew

8.6

Comfort

7.9

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

7.8
Good
1,779 reviews
8.1
Very good
11,936 reviews

Entertainment

8.1

Overall

8.1

Boarding

8.2

Food

7.5

Crew

8.6

Comfort

7.9

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

7.7
Good
5,291 reviews
8.1
Very good
11,936 reviews

Entertainment

8.1

Overall

8.1

Boarding

8.2

Food

7.5

Crew

8.6

Comfort

7.9

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

7.7
Good
773 reviews
8.1
Very good
11,936 reviews

Entertainment

8.1

Overall

8.1

Boarding

8.2

Food

7.5

Crew

8.6

Comfort

7.9

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

7.6
Good
1,974 reviews
8.1
Very good
11,936 reviews

Entertainment

8.1

Overall

8.1

Boarding

8.2

Food

7.5

Crew

8.6

Comfort

7.9

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Related info for your journey

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

If you book a flight to London Heathrow 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. There are 0 flights from Ontario to London Heathrow per day from 6 different airlines.

Can I find flights from Ontario to London Heathrow Airport for under $700 on Cheapflights?

Yes, there are multiple flights from Ontario to London Heathrow Airport for under $700. The cheapest flight booked recently is on United Airlines for just $647, but on average you can expect to pay $674.

Are there last-minute flights available from Ontario to London Heathrow Airport for under $900?

There are currently 20+ open flights from Ontario to London Heathrow Airport within the next 7 days for less than $900.

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

According to our current data, United Airlines ($647), Air Canada ($660), and American Airlines ($669) offers the cheapest pricing from Ontario to London Heathrow Airport. United Airlines is 22% cheaper than the average price of flights available within the next 90 days to this destination.

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

To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $459. Iberia flights start at $493 while deals on American Airlines start at $559 one-way.

What are the most popular airlines that fly from Ontario to London Heathrow Airport?

What does ONT to LHR mean?

These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Ontario Airport to London Heathrow Airport flight would often be abbreviated as a ONT to LHR flight.

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.

Top 6 airlines flying from Ontario to Heathrow

Discover the top 6 airlines that operate flights from Ontario to Heathrow. 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 3,436,117 searches. Data last updated febrero 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$592Average$786FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest$597Average$938FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest$602Average$668FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$604Average$926FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$614Average$807FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
IberiaCheapest$760Average$1,012FlexibilityNo cancel feeOn-time77%
Search Iberia flights

Search flights from Ontario to Heathrow by cabin class

Find flights from Ontario to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to Heathrow?

Cheapflights makes it easy to find Ontario to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Heathrow?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ontario to Heathrow for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Ontario to Heathrow with no change fees?

Certainly. Search results for flights to Heathrow from Ontario shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Ontario to Heathrow become cheaper?

Yes! Start tracking prices for Ontario to Heathrow flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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