How long is the flight from London to Ontario?

Airlines like United Airlines, Virgin Atlantic, and Delta fly from London to Ontario in about 21h 01m. The time it takes to get you to your destination can typically vary by up to 23h 10m. The distance from London to Ontario is about 5407 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

According to our current data, United Airlines (£367), Virgin Atlantic (£371), and British Airways (£385) offers the cheapest pricing from London to Ontario. You may be able to fly from London to Ontario for 31% less than the average price by searching for these airlines.

In terms of precipitation, rainfall in Ontario ranges from 3.0 - 86.0 inches per month. February is typically the wettest month, when rainfall can reach 86.0 mm. June is typically the driest time to visit Ontario when rainfall is around 3.0 mm.

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 26.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 12.0 C).

What are the most popular routes from London to Ontario?

The most popular route from London to Ontario is London Heathrow - Ontario. You may also consider London Gatwick - Ontario or London City - Ontario.

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

When booking a flight from London to Ontario, you may want to consider flying on British Airways, Virgin Atlantic or United Airlines as they are the most popular for this route.

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

When flying from London to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Most people fly into Ontario (ONT) if they book a flight to Ontario from London. On average, Ontario has 0 inbound flights from London per day from 3 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

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

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

How can I find direct flights from London to Ontario?

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

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

Yes. Cheapflights offers flight deals from London 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.

£345+ Cheap Flights from London to Ontario

Cheap flight deals from London to Ontario

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from London to Ontario
Explore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 September 2026.

Wed 25/1109:00 -

2 stops19h 02m

Sun 6/1216:03 -

1 stop31h 22m

Deal found 3/9£377

Wed 4/1109:00 -

2 stops19h 15m

Wed 11/1106:00 -

1 stop17h 40m

Deal found 2/9£378

Mon 19/1006:55 -

2 stops40h 27m

Sun 25/1006:00 -

1 stop22h 15m

Deal found 3/9£381

Thu 15/1007:30 -

2 stops21h 01m

Tue 20/1011:10 -

2 stops17h 50m

Deal found 4/9£382

Wed 4/1108:40 -

2 stops46h 03m

Fri 4/1213:11 -

2 stops57h 54m

Deal found 3/9£388

Thu 10/911:40 -

1 stop19h 00m

Wed 23/911:54 -

1 stop15h 26m

Deal found 1/9£399

Mon 19/1010:00 -

2 stops20h 43m

Sun 25/1006:20 -

2 stops42h 50m

Deal found 2/9£418

Fri 11/910:25 -

2 stops20h 15m

Mon 28/911:54 -

2 stops20h 06m

Deal found 4/9£424

Wed 7/1008:25 -

2 stops22h 18m

Wed 21/1009:45 -

2 stops22h 55m

Deal found 4/9£429

Tue 6/1017:00 -

2 stops37h 43m

Sun 11/1006:20 -

2 stops43h 20m

Deal found 4/9£431

Wed 4/1110:00 -

2 stops44h 11m

Tue 10/1112:18 -

2 stops20h 17m

Deal found 2/9£433

Fri 30/1016:45 -

2 stops36h 58m

Sun 15/1107:00 -

2 stops42h 00m

Deal found 1/9£439

Best flights from London to Ontario
Discover carefully curated flight deals from London to Ontario that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 September 2026.

Thu 15/1007:30 -

2 stops21h 01m

Tue 20/1011:10 -

2 stops17h 50m

Deal found 4/9£382

Wed 4/1110:00 -

2 stops44h 11m

Tue 10/1112:18 -

2 stops20h 17m

Deal found 2/9£433

Thu 29/1014:45 -

1 stop15h 57m

Fri 25/1206:00 -

1 stop22h 20m

Deal found 3/9£435

Sun 8/1113:45 -

2 stops34h 39m

Wed 25/1107:00 -

2 stops25h 35m

Deal found 31/8£474

Wed 4/1107:50 -

2 stops33h 50m

Mon 23/1107:00 -

2 stops23h 15m

Deal found 31/8£530

Tue 2/311:55 -

2 stops17h 50m

Tue 23/312:00 -

2 stops18h 40m

Deal found 1/9£750

Sat 26/916:15 -

1 stop14h 44m

Sun 4/1013:24 -

1 stop15h 11m

Deal found 4/9£405

Wed 16/917:00 -

1 stop26h 16m

Sat 26/915:14 -

1 stop15h 51m

Deal found 31/8£444

Sat 19/913:00 -

1 stop15h 01m

Sat 26/907:00 -

1 stop15h 45m

Deal found 4/9£405

Sun 8/1113:45 -

2 stops34h 39m

Thu 26/1106:00 -

2 stops26h 35m

Deal found 31/8£474

Fri 16/1013:00 -

1 stop15h 31m

Sat 31/1013:29 -

1 stop13h 11m

Deal found 4/9£405

Sat 26/913:40 -

1 stop16h 19m

Fri 27/1113:35 -

1 stop13h 40m

Deal found 31/8£406

Fri 30/1011:55 -

2 stops18h 47m

Fri 25/1206:00 -

2 stops20h 55m

Deal found 3/9£1,117

Tue 3/1119:15 -

2 stops31h 27m

Mon 23/1107:00 -

2 stops23h 15m

Deal found 31/8£569

Mon 19/1010:00 -

2 stops20h 43m

Sun 25/1006:20 -

2 stops42h 50m

Deal found 4/9£573

Mon 5/1013:00 -

1 stop15h 31m

Mon 12/1009:25 -

1 stop14h 00m

Deal found 4/9£406

Wed 7/1017:00 -

1 stop25h 17m

Sat 10/1014:13 -

1 stop16h 52m

Deal found 4/9£551

Thu 1/1010:25 -

2 stops19h 59m

Thu 15/1007:07 -

2 stops18h 18m

Deal found 4/9£582

Tue 29/1210:00 -

1 stop20h 11m

Tue 5/116:03 -

1 stop35h 12m

Deal found 31/8£406

Thu 24/917:35 -

2 stops35h 22m

Mon 28/922:39 -

2 stops33h 56m

Deal found 3/9£1,322

Thu 15/1011:30 -

2 stops20h 22m

Thu 22/1012:43 -

2 stops23h 17m

Deal found 31/8£614

Fri 16/1007:45 -

2 stops22h 14m

Fri 23/1013:24 -

1 stop12h 16m

Deal found 1/9£407

Wed 30/919:15 -

2 stops36h 21m

Mon 12/1007:00 -

2 stops22h 20m

Deal found 4/9£620

Sun 4/1010:55 -

1 stop13h 40m

Sat 10/1018:00 -

1 stop13h 35m

Deal found 2/9£654

Wed 30/919:15 -

2 stops36h 21m

Thu 15/1014:22 -

2 stops34h 38m

Deal found 4/9£626

Wed 30/915:40 -

2 stops39h 44m

Wed 7/1014:13 -

2 stops16h 27m

Deal found 2/9£880

Wed 30/909:35 -

2 stops46h 01m

Wed 7/1012:43 -

2 stops42h 32m

Deal found 2/9£674

Wed 3/307:50 -

2 stops21h 38m

Wed 24/310:31 -

2 stops20h 34m

Deal found 2/9£691

Fri 16/1007:25 -

2 stops24h 17m

Fri 23/1014:13 -

2 stops24h 12m

Deal found 1/9£1,085

Mon 1/319:15 -

2 stops22h 26m

Mon 22/310:31 -

2 stops20h 44m

Deal found 31/8£691

Find flight deals from London to Ontario

Round-trip from	£377
One-way from	£345
Popular in	June
Cheapest in	March
Average price	£498

United Airlines
25/11-6/12
3 total stops
50h 24m total
London to Ontario

Search Deals

19/10-31/12
3 total stops
59h 36m total
London to Ontario

Search Deals

Highest demand for flights based on searches. 14% potential increase in price (£64 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 11/11

06:15-23:46

2 stops25h 31m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£370

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 15/10

07:30-20:31

2 stops21h 01m

Ontario

Tue 20/10

11:10-13:00

2 stops17h 50m

£382

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 26/9

16:15-22:59

1 stop14h 44m

Ontario

Sun 4/10

13:24-12:35

1 stop15h 11m

£405

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 19/9

13:00-20:01

1 stop15h 01m

Ontario

Sat 26/9

07:00-06:45

1 stop15h 45m

£405

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 16/10

13:00-20:31

1 stop15h 31m

Ontario

Sat 31/10

13:29-09:40

1 stop13h 11m

£405

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 26/9

13:40-21:59

1 stop16h 19m

Ontario

Fri 27/11

13:35-11:15

1 stop13h 40m

£406

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 5/10

13:00-20:31

1 stop15h 31m

Ontario

Mon 12/10

09:25-07:25

1 stop14h 00m

£406

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 29/12

10:00-22:11

1 stop20h 11m

Ontario

Tue 5/1

16:03-11:15

1 stop35h 12m

£406

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 16/10

07:45-21:59

2 stops22h 14m

Ontario

Fri 23/10

13:24-09:40

1 stop12h 16m

£407

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 1/12

15:10-20:20

2 stops37h 10m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£416

Flights are sorted by cheapest return flights first.

Deals found on 4/9

Showing 1-10 of 60 resultsSorted by cheapest first

...

Best time to book a flight from London to Ontario

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

LON-ONT

LHR-ONT

LCY-ONT

LGW-ONT

Estimated return 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 to Ontario

LON-ONT

LHR-ONT

LCY-ONT

LGW-ONT

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

Currently, January is the cheapest month in which you can book a flight from London to Ontario (average of £409). Flying from London to Ontario in June is currently the most expensive (average of £652). 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.

How much does it cost for a return flight from London to Ontario?

Airfare is below average for this route at the moment.

London to Ontario flights typically cost between £458 and £555 in November.
The cheapest return price found within the last 5 days was £377 on United Airlines (25 Nov–6 Dec).

What’s the top stopover airport for flights from London to Ontario?

Dallas (DFW) – chosen by Cheapflights users on 38% of one-stop itineraries from London to Ontario on Cheapflights.

What’s the cheapest stopover airport for flights from London to Ontario?

Denver (DEN) is the most affordable one-stop option, with an average return flight price of £409.

What’s the fastest stopover option from London to Ontario?

Flights via Denver (DEN) have the shortest average one-way travel time for one-stop routes: 13h 54m.

Which airport typically offers the quickest stopover for flights from London to Ontario?

Flights via Dallas (DFW) offer the fastest connection on this route, with an average stopover time of 1h 42m.

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from London to Ontario, such as Delta,United Airlines, andVirgin Atlantic. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

7.8

Good

8,564 reviews

Check prices

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

7.8

Good

8,564 reviews

Delta

7.8

Good

8,564 reviews

Check prices

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

10,170 reviews

Delta

7.8

Good

8,564 reviews

Check prices

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

Virgin Atlantic

7.4

Good

696 reviews

Delta

7.8

Good

8,564 reviews

Check prices

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

British Airways

6.7

Okay

8,203 reviews

Delta

7.8

Good

8,564 reviews

Check prices

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?
Most people fly into Ontario (ONT) if they book a flight to Ontario from London. On average, Ontario has 0 inbound flights from London per day from 3 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.
How long is the flight from London to Ontario?
Airlines like United Airlines, Virgin Atlantic, and Delta fly from London to Ontario in about 21h 01m. The time it takes to get you to your destination can typically vary by up to 23h 10m. The distance from London to Ontario is about 5407 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines flying from London to Ontario round-trip?
According to our current data, United Airlines (£367), Virgin Atlantic (£371), and British Airways (£385) offers the cheapest pricing from London to Ontario. You may be able to fly from London to Ontario for 31% less than the average price by searching for these airlines.
What are the most popular routes from London to Ontario?
The most popular route from London to Ontario is London Heathrow - Ontario. You may also consider London Gatwick - Ontario or London City - Ontario.
Can I find deals for flights from London to Ontario that include hotel bookings?
Yes. In addition to deals on London to Ontario flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from London to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Ontario.
Can I find deals for business class flights from London to Ontario?
Yes. Cheapflights offers flight deals from London 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 to Ontario?
Currently, January is the cheapest month in which you can book a flight from London to Ontario (average of £409). Flying from London to Ontario in June is currently the most expensive (average of £652). 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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Top 3 airlines flying from London to Ontario

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest£367	Average£557	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Virgin Atlantic	Cheapest£371	Average£497	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£385	Average£512	FlexibilityNo cancel fee	On-time70%	Search British Airways flights

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

When you search for this flight from London to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Cheapflights helps you find that perfect flight to Ontario from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from London to Ontario, users can toggle the no change fees filter when performing a flight search.

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

Yes, Cheapflights offers price alerts on London to Ontario flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from London to Ontario from £345

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 19/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from London to Ontario

Cheapest flights from London to OntarioExplore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 September 2026.

Explore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 September 2026.

Best flights from London to OntarioDiscover carefully curated flight deals from London to Ontario that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 September 2026.

Discover carefully curated flight deals from London to Ontario that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 September 2026.

Last-minute flights from London to OntarioDiscover last-minute flight deals from London to Ontario. Data last updated 5 September 2026 and is based on user searches.

Discover last-minute flight deals from London to Ontario. Data last updated 5 September 2026 and is based on user searches.

One-way flights from London to OntarioSearch for one-way flight options from London to Ontario. Find affordable one-way fares based on user searches. Data last updated 5 September 2026.

Search for one-way flight options from London to Ontario. Find affordable one-way fares based on user searches. Data last updated 5 September 2026.

Find flight deals from London to Ontario

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Best time to book a flight from London to Ontario

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

Cheapflights Insights

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

How much does it cost for a return flight from London to Ontario?

Airfare is below average for this route at the moment.

London to Ontario flights typically cost between £458 and £555 in November.The cheapest return price found within the last 5 days was £377 on United Airlines (25 Nov–6 Dec).

What’s the top stopover airport for flights from London to Ontario?

Share of one-stop return flights from London to Ontario chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Dallas (DFW) – chosen by Cheapflights users on 38% of one-stop itineraries from London to Ontario on Cheapflights.

What’s the cheapest stopover airport for flights from London to Ontario?

Average return fare for one-stop flights from London to Ontario, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Denver (DEN) is the most affordable one-stop option, with an average return flight price of £409.

What’s the fastest stopover option from London to Ontario?

Shortest average travel time for one-stop one-way flights from London to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Denver (DEN) have the shortest average one-way travel time for one-stop routes: 13h 54m.

Which airport typically offers the quickest stopover for flights from London to Ontario?

Average stopover duration for one-stop one-way flights from London to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Dallas (DFW) offer the fastest connection on this route, with an average stopover time of 1h 42m.

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from London to Ontario, such as Delta,United Airlines, andVirgin Atlantic. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

How long is the flight from London to Ontario?

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

What are the most popular routes from London to Ontario?

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

How can I find direct flights from London to Ontario?

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

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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for London to Ontario

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

Complete your trip

Complete your trip to Ontario by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to California

Book a non-stop flight to one of these other cities located in California.

Search flights from London to Ontario by cabin class

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

Other flights to Ontario

Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 5 September 2026.

London and Ontario flights

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Other flights from London

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London to Ontario flights

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Top 3 airlines flying from London to Ontario

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

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

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

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

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Cheapest flights from London to Ontario
Explore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 September 2026.

Best flights from London to Ontario
Discover carefully curated flight deals from London to Ontario that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 September 2026.

Last-minute flights from London to Ontario
Discover last-minute flight deals from London to Ontario. Data last updated 5 September 2026 and is based on user searches.

One-way flights from London to Ontario
Search for one-way flight options from London to Ontario. Find affordable one-way fares based on user searches. Data last updated 5 September 2026.

London to Ontario flights typically cost between £458 and £555 in November.
The cheapest return price found within the last 5 days was £377 on United Airlines (25 Nov–6 Dec).