Cheap flights from Ontario (ONT) to London (LON) from $571

This is the cheapest one-way flight price, found on 5/29. Prices may vary by date and flight preferences.
ONT — LON
Jun 4 — Jun 111

The best prices from Ontario to London are usually found in February or January, booked 60 days in advance, depart on a Monday or Thursday and return on a Monday

How to find the cheapest flight from Ontario (ONT) to London (LON)

All the information you need to plan the best ONT to LON flight in 2023: compare Ontario to London flight prices with the expected peak season, weather and rainfall in London.

Popular in

December

Cheapest in

February

Round-trip from

$711

One-way from

$571
High demand for flights, 26% potential price rise
Best time to find cheap flights, 25% potential price drop
From Ontario to London (LON)
One-way flight from Ontario to London (LON)

ONT - LON

Price

$711 - $1,281

LON

Temperature

39.2 - 62.6 °F

LON

Rainfall

1.6 - 2.8 inches

Cheap flights from Ontario to London in May, June 2023

The best prices found for ONT to LON flights for May, June
Listed are some of the best fares we've found on flights departing from Ontario to London in 2023. For more flight deals, be sure to check back very soon.

Ontario to London 2023 flight deals

Cheap flights to London from Ontario found for this year
Listed are some of the best fares we've found on flights departing from Ontario to London in 2023. For more flight deals, be sure to check back very soon.

Cheap Iberia flights from Ontario to London

Check out some of the cheapest Iberia flights we've come across from Ontario to London. Make sure to check back often as deals are often changing.

Cheap Air Canada flights from Ontario to London

Some of the best deals we've found on Air Canada flights traveling from Ontario to London. Ensure the flight price, dates, time, and airline match your criteria before you book.

Last minute flights from Ontario to London

Late deals on return flights to London from Ontario, departing today and this week
Consider one of these great deals we found on last-minute flights from Ontario to London. Users should examine the flight details to ensure there are no surprises.

One-way flights to London from Ontario

The cheapest one-way flights from Ontario to London
Users in need of a one-way flight from Ontario to London can choose from these deals. Those seeking round-trip flights from Ontario to London should utilize the search form at the the top of the page.

Find flights from Ontario to London within your budget

Use the slider to find flights from Ontario to London that fit your budget.

Fly from

Any airport

Fly to

Any airport

Budget

$618 - $668

Route

Depart

Return

Price

OntarioLondon Gatwick

ONT - LGW

ONTLGW

Ontario

Tue 9/12

2 stops36h 12m

London Gatwick

Tue 9/26

2 stops27h 58m

OntarioLondon Gatwick

ONT - LGW

ONTLGW

Ontario

Wed 10/18

2 stops17h 30m

London Gatwick

Sat 10/28

2 stops18h 57m

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 8/16

1 stop16h 15m

London Heathrow

Fri 8/25

2 stops20h 22m

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 9/20

2 stops43h 55m

London Heathrow

Wed 10/11

2 stops36h 01m

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Thu 11/2

1 stop20h 55m

London Heathrow

Mon 11/6

2 stops29h 33m

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 9/20

1 stop17h 53m

London Heathrow

Tue 10/10

2 stops24h 03m

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 8/16

1 stop12h 15m

London Heathrow

Mon 9/25

1 stop15h 14m

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Mon 7/31

1 stop14h 00m

London Heathrow

Mon 8/21

2 stops36h 19m

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 11/1

2 stops15h 20m

London Heathrow

Wed 11/8

2 stops17h 23m

Flights are sorted by cheapest first

Deals found on 5/29

Reviews of Airlines Servicing London

Get a feel of what it's like to fly with Iberia, Air Canada and United Airlines from Ontario to London by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
1,375 reviews

Food

7.2

Crew

8.6

Entertainment

7.1

Boarding

8.3

Comfort

8.0

Overall

8.0

Reviews

1 / 10

Such a short time in the air. No real commentary but the stewardi were very nice.

Alaska Airlines
8.0
Very good
1,375 reviews
Alaska Airlines
8.0
Very good
1,375 reviews

Food

7.2

Crew

8.6

Entertainment

7.1

Boarding

8.3

Comfort

8.0

Overall

8.0

Reviews

1 / 10

Such a short time in the air. No real commentary but the stewardi were very nice.

Delta
8.0
Very good
2,359 reviews
Alaska Airlines
8.0
Very good
1,375 reviews

Food

7.2

Crew

8.6

Entertainment

7.1

Boarding

8.3

Comfort

8.0

Overall

8.0

Reviews

1 / 10

Such a short time in the air. No real commentary but the stewardi were very nice.

Air France
7.6
Good
193 reviews
Alaska Airlines
8.0
Very good
1,375 reviews

Food

7.2

Crew

8.6

Entertainment

7.1

Boarding

8.3

Comfort

8.0

Overall

8.0

Reviews

1 / 10

Such a short time in the air. No real commentary but the stewardi were very nice.

United Airlines
7.6
Good
1,521 reviews
Alaska Airlines
8.0
Very good
1,375 reviews

Food

7.2

Crew

8.6

Entertainment

7.1

Boarding

8.3

Comfort

8.0

Overall

8.0

Reviews

1 / 10

Such a short time in the air. No real commentary but the stewardi were very nice.

KLM
7.6
Good
159 reviews
Alaska Airlines
8.0
Very good
1,375 reviews

Food

7.2

Crew

8.6

Entertainment

7.1

Boarding

8.3

Comfort

8.0

Overall

8.0

Reviews

1 / 10

Such a short time in the air. No real commentary but the stewardi were very nice.

Related info for your journey

Useful info, stats and facts about Ontario to London flights.

Top 7 airlines flying from Ontario to London

The chart below displays the airlines Cheapflights users traveling from Ontario to London choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
DeltaCheapest$623Average$1,029FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Delta flights
Virgin AtlanticCheapest$629Average$906FlexibilityNo cancel feeOn-time72%COVID-19 safety
Search Virgin Atlantic flights
United AirlinesCheapest$657Average$949FlexibilityNo cancel feeOn-time69%COVID-19 safety
Search United Airlines flights
American AirlinesCheapest$665Average$1,001FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights
British AirwaysCheapest$676Average$941FlexibilityNo cancel feeOn-time70%COVID-19 safety
Search British Airways flights
KLMCheapest$773Average$987FlexibilityNo cancel feeOn-time75%COVID-19 safety
Search KLM flights
IberiaCheapest$840Average$1,043FlexibilityNo cancel feeOn-time77%COVID-19 safety
Search Iberia flights
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.