What is the cheapest airline that flies from Ontario to London?

United Airlines, Delta, and Turkish Airlines are the most popular carriers operating from Ontario to London

Which layover airport has the shortest connection time from Ontario to London?

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 13m.

Which layover airport has the shortest travel time from Ontario to London?

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 12h 40m.

What airlines fly to London?

British Airways, Virgin Atlantic and United Airlines are the top three most popular airlines that fly to London from Ontario according to our data. British Airways is the first choice among our users, with 47% of people opting to fly with this airline when traveling to London. Keep in mind that there are 21 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

Which airport is the most popular layover for flights between Ontario and London?

Dallas (DFW) was the most common stop: 25% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Ontario to London?

Flights via Salt Lake City (SLC) offer the lowest average round-trip price of $624.

When did momondo last update prices for flights from Ontario Airport to London?

Prices for flights from Ontario Airport to London are updated daily.

How many operators does momondo search for flights from Ontario Airport to London?

As of June 2026, there are 5 operators available to choose from for flights from Ontario Airport to London.

How old do you have to be to fly from Ontario Airport to London?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to London.

What documentation or ID do you need to fly to London?

The necessary travel and health documents for your London trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$320 Cheap Flights from Ontario to London in 2026

Q: What is the typical price of a round-trip flight between Ontario and London?

Prices are currently low for flights on this route. Typical prices usually range from $1,545 to $1,304. The lowest price recently found on this route was $826.

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Ontario to London

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:05 pm - 3:05 pm

ONT

LHR

18h 00m

1 stop

10:50 am - 11:06 pm

LHR

ONT

20h 16m

2 stops

$826Multiple Airlines

dom., sep. 27 - mié., oct. 7

1:05 pm - 3:05 pm

ONT

LHR

18h 00m

1 stop

8:55 am - 9:08 pm

LHR

ONT

20h 13m

1 stop

$828British Airways

dom., sep. 27 - mié., oct. 7

2:22 pm - 12:50 pm

ONT

LHR

14h 28m

1 stop

8:55 am - 10:37 pm

LHR

ONT

21h 42m

1 stop

$829British Airways

mié., sep. 9 - sáb., sep. 19

10:47 am - 12:15 pm

ONT

LHR

17h 28m

1 stop

7:40 pm - 10:23 pm

LHR

ONT

34h 43m

2 stops

$831Multiple Airlines

mié., nov. 11 - mié., nov. 18

6:00 am - 7:10 am

ONT

LHR

17h 10m

2 stops

11:45 am - 9:11 pm

LHR

ONT

17h 26m

1 stop

$832Multiple Airlines

mar., nov. 3 - mar., nov. 10

6:02 am - 3:05 pm

ONT

LHR

25h 03m

1 stop

5:00 pm - 2:16 pm

LHR

ONT

29h 16m

1 stop

$841Alaska Airlines

mié., sep. 2 - mié., sep. 16

7:05 am - 9:25 am

ONT

LGW

18h 20m

2 stops

10:25 am - 10:40 pm

LGW

ONT

20h 15m

2 stops

$907Delta

mié., sep. 23 - lun., sep. 28

7:05 am - 9:20 am

ONT

LGW

18h 15m

2 stops

10:25 am - 10:40 pm

LGW

ONT

20h 15m

2 stops

$928Delta

sáb., sep. 5 - jue., sep. 10

2:14 pm - 2:40 pm

ONT

LGW

16h 26m

2 stops

3:40 pm - 11:42 pm

LGW

ONT

40h 02m

2 stops

$1,181Icelandair

jue., oct. 15 - lun., oct. 19

10:22 am - 3:15 pm

ONT

LCY

20h 53m

2 stops

9:35 am - 11:59 pm

LCY

ONT

22h 24m

2 stops

$2,403Iberia

jue., jun. 18 - mar., jun. 23

Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

Alaska Airlines

Sep 2

ONT6:02 amOntario

25h 03m

1 stop

LHR3:05 pmLondon Heathrow

Sep 16

LHR5:00 pmLondon Heathrow

29h 16m

1 stop

ONT2:16 pmOntario

$841

Alaska Airlines

Sep 13

ONT3:14 pmOntario

15h 51m

1 stop

LHR3:05 pmLondon Heathrow

Sep 17

LHR5:00 pmLondon Heathrow

14h 24m

1 stop

ONT11:24 pmOntario

$865

Alaska Airlines

Sep 29

ONT3:14 pmOntario

15h 51m

1 stop

LHR3:05 pmLondon Heathrow

Oct 7

LHR5:00 pmLondon Heathrow

14h 42m

1 stop

ONT11:42 pmOntario

$877

United Airlines flights from Ontario to London

Our best United Airlines deals on Ontario to London flight tickets

United Airlines

Sep 5

ONT1:18 pmOntario

24h 02m

2 stops

LHR9:20 pmLondon Heathrow

Sep 10

LHR9:30 amLondon Heathrow

20h 29m

2 stops

ONT9:59 pmOntario

$882

United Airlines

Aug 31

ONT1:18 pmOntario

24h 07m

2 stops

LHR9:25 pmLondon Heathrow

Sep 10

LHR7:30 amLondon Heathrow

20h 31m

2 stops

ONT8:01 pmOntario

$883

United Airlines

Sep 1

ONT9:15 amOntario

14h 40m

1 stop

LHR7:55 amLondon Heathrow

Sep 29

LHR1:40 pmLondon Heathrow

16h 18m

1 stop

ONT9:58 pmOntario

$896

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

dom. 9/27

1:05 pm-3:05 pm

1 stop18h 00m

London Heathrow

mié. 10/7

10:50 am-11:06 pm

2 stops20h 16m

$826

OntarioLondon

ONT - LHR

ONTLHR

Ontario

dom. 9/27

1:05 pm-3:05 pm

1 stop18h 00m

London Heathrow

mié. 10/7

8:55 am-9:08 pm

1 stop20h 13m

$828

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mié. 9/9

2:22 pm-12:50 pm

1 stop14h 28m

London Heathrow

sáb. 9/19

8:55 am-10:37 pm

1 stop21h 42m

$829

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mié. 11/11

10:47 am-12:15 pm

1 stop17h 28m

London Heathrow

mié. 11/18

7:40 pm-10:23 pm

2 stops34h 43m

$831

Quickest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mar. 11/3

6:00 am-7:10 am

2 stops17h 10m

London Heathrow

mar. 11/10

11:45 am-9:11 pm

1 stop17h 26m

$832

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mié. 9/2

6:02 am-3:05 pm

1 stop25h 03m

London Heathrow

mié. 9/16

5:00 pm-2:16 pm

1 stop29h 16m

$841

OntarioLondon

ONT - LGW

ONTLGW

Ontario

mié. 9/23

7:05 am-9:25 am

2 stops18h 20m

London Gatwick

lun. 9/28

10:25 am-10:40 pm

2 stops20h 15m

$907

OntarioLondon

ONT - LGW

ONTLGW

Ontario

sáb. 9/5

7:05 am-9:20 am

2 stops18h 15m

London Gatwick

jue. 9/10

10:25 am-10:40 pm

2 stops20h 15m

$928

OntarioLondon

ONT - LGW

ONTLGW

Ontario

jue. 10/15

2:14 pm-2:40 pm

2 stops16h 26m

London Gatwick

lun. 10/19

3:40 pm-11:42 pm

2 stops40h 02m

$1,181

OntarioLondon

ONT - LCY

ONTLCY

Ontario

jue. 6/18

10:22 am-3:15 pm

2 stops20h 53m

London City

mar. 6/23

9:35 am-11:59 pm

2 stops22h 24m

$2,403

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Ontario to London

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

What is the typical price of a round-trip flight between Ontario and London?

What is the cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in September. Flight prices, which tend to average around $251, are often lower during this time because this is during the off-season. The month of December is another great option to travel to London, with average flight prices from Ontario averaging around $282.

What is the cheapest day to depart on your flight to London?

The cheapest day to depart from Ontario to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $766. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $900. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

What is the cheapest time of day to depart on your flight to London?

Flying to London from Ontario at noon is the least expensive time of day to depart. momondo users have found prices as low as $688 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $851. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Ontario to London flights?

You could potentially save up to 45% on your flight if you consider stops on a Ontario to London flight.

When to book flights from Ontario to London

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to London according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Ontario to London (ONT to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to London

Fastest flight time	12h 22m
Direct flights	None

The fastest flight from Ontario to London takes 12h 22m

There are no direct flights from Ontario to London. There are no popular flight routes from Ontario to London.

Search flight deals

Frequently asked questions about flying from Ontario to London

How far is Ontario to London by plane?
The straight-line distance from Ontario to London is 5417.5 mi. A reasonable flight in good conditions will take 12h 22m.
When did momondo last update prices for flights from Ontario Airport to London?
Prices for flights from Ontario Airport to London are updated daily.
How many operators does momondo search for flights from Ontario Airport to London?
As of June 2026, there are 5 operators available to choose from for flights from Ontario Airport to London.
How old do you have to be to fly from Ontario Airport to London?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to London.
What documentation or ID do you need to fly to London?
The necessary travel and health documents for your London trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Ontario to London?
momondo data reveals that the most frequently booked airline on the route from Ontario to London is United Airlines, representing 51% of all bookings. The subsequent popular airlines are British Airways at 31% and Delta at 18%.

Best airlines flying from Ontario to London

Compare and see reviews for airlines that fly from Ontario to London with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,395 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.8 1,524 reviews	Search KLM flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.1 11,641 reviews	Search American Airlines flights
British Airways	PriceFrom $624	Free Cancellation	Rating 6.7 8,026 reviews	Search British Airways flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 9,773 reviews	Search United Airlines flights

Hounslow

Gatwick

Milton Keynes

Luton

Dover

Hayes

Crawley

Croydon

Wembley

Stansted

Slough

Harrow

Brentwood

Watford

Cobham

Guildford

Folkestone

Uxbridge

Romford

Chelmsford

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to London?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to London. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to London with flexible booking policies on momondo?

All flight searches from Ontario to London on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to London.

I’m not ready to book a flight from Ontario to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

sáb. 7/4

sáb. 7/11

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Nearby airports

Airlines

Cabin classes

Other United Kingdom destinations

Other flights from Ontario

Complete your trip

Feeling lucky

Fly into one of these airports located in London

London City Airport

London Gatwick Airport

London Heathrow Airport

London Luton Airport

London Southend Airport

London Stansted Airport

Cheap flights from Ontario to London from $319

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to London departing on 10/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Ontario to London

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

United Airlines flights from Ontario to London

Our best United Airlines deals on Ontario to London flight tickets

momondo Fare Finder

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

See travel insights to London from

How to get the cheapest flight ticket from Ontario to London

What is the typical price of a round-trip flight between Ontario and London?

What is the cheapest month to fly to London?

What is the cheapest day to depart on your flight to London?

What is the cheapest time of day to depart on your flight to London?

Can stopping save me money on Ontario to London flights?

What is the cheapest airline that flies from Ontario to London?

What airlines fly to London?

Which airport is the most popular layover for flights between Ontario and London?

Which layover airport offers the lowest fares from Ontario to London?

Which layover airport has the shortest travel time from Ontario to London?

Which layover airport has the shortest connection time from Ontario to London?

When to book flights from Ontario to London

Cheap Ontario to London (ONT to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to London

Fastest flight time

Direct flights

Frequently asked questions about flying from Ontario to London

Best airlines flying from Ontario to London

Compare and see reviews for airlines that fly from Ontario to London with momondo

Traveling to a place near London?

Why use momondo?

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London

Fly your favorite airline to London

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to London

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Ontario

According to popular flight searches on momondo this year

Complete your trip to London

Explore popular destinations other users love

According to popular flight searches on momondo this year