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£275+ Cheap flights to Ontario

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
17 Mar — 24 Mar1
1 adult
1 adult, Economy, 0 bags

Flights to Ontario in 2026

Enter your travel dates to find the best prices.

Cheapest flights to Ontario
Explore the most affordable flight options available to Ontario. Find the lowest fares based on data from user searches, with prices last updated on 15 February 2026.

Tue 3/306:35
LHR
-
ONT
2 stops19h 06m
United Airlines
Tue 10/313:50
ONT
-
LHR
1 stop12h 50m
United Airlines
Deal found 12/2£368
Sat 28/206:30
LHR
-
ONT
2 stops19h 11m
United Airlines
Mon 9/313:50
ONT
-
LHR
1 stop12h 50m
United Airlines
Deal found 12/2£369
Mon 30/316:25
LHR
-
ONT
1 stop15h 34m
British Airways
Mon 6/412:22
ONT
-
LHR
1 stop14h 28m
British Airways
Deal found 13/2£386
Wed 12/812:55
LHR
-
ONT
1 stop17h 19m
Finnair
Thu 27/810:50
ONT
-
LHR
1 stop17h 20m
Finnair
Deal found 14/2£387
Wed 12/816:25
LHR
-
ONT
1 stop15h 43m
British Airways
Thu 27/816:54
ONT
-
LHR
1 stop14h 11m
British Airways
Deal found 12/2£389
Tue 17/309:55
LHR
-
ONT
1 stop16h 50m
British Airways
Tue 24/310:56
ONT
-
LHR
1 stop14h 19m
British Airways
Deal found 14/2£393
Thu 19/216:30
LHR
-
ONT
1 stop15h 29m
British Airways
Thu 26/214:39
ONT
-
LHR
1 stop13h 01m
British Airways
Deal found 11/2£394
Wed 10/617:45
LHR
-
ONT
1 stop31h 31m
Virgin Atlantic
Wed 19/807:00
ONT
-
LHR
1 stop21h 10m
Virgin Atlantic
Deal found 14/2£396
Wed 25/310:45
LHR
-
ONT
1 stop20h 06m
Delta
Tue 31/311:59
ONT
-
LHR
1 stop16h 11m
Delta
Deal found 15/2£398
Sat 18/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Thu 30/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 13/2£398
Thu 19/207:50
LCY
-
ONT
2 stops24h 09m
British Airways
Sun 8/323:58
ONT
-
LCY
2 stops31h 37m
British Airways
Deal found 12/2£469
Thu 19/207:50
LCY
-
ONT
2 stops24h 09m
British Airways
Sat 7/323:58
ONT
-
LCY
2 stops48h 52m
British Airways
Deal found 12/2£476

Find flight deals to Ontario

Find the latest flights to Ontario in 2026, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 858,174 searches and data was last updated on 15 February 2026.

Return from

£343

One-way from

£275

Popular in

December

Cheapest in

September

Average price

£390
Austrian Airlines
  • Austrian Airlines
  • 1/3-11/3
  • 2 total stops
  • 29h 45m total
  • London to Los Angeles
Search Deals
9/3
  • 9/3
  • 2 total stops
  • 30h 28m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£29 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for return flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Locate flights to Ontario that fit your budget, with regularly updated fares and availability. In the last 7 days, Cheapflights users made a total of 858,174 searches and data was last updated on 15 February 2026.
Use the filters below to find and compare flights to Ontario that are best for you.

Fly from

London

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/3

10:15-18:42

1 stop15h 27m

Ontario

Tue 17/3

10:56-06:50

1 stop12h 54m

£404

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/3

08:20-16:19

1 stop15h 59m

Ontario

Tue 10/3

10:56-08:15

1 stop14h 19m

£406

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/2

11:45-19:45

1 stop16h 00m

Ontario

Wed 4/3

14:39-11:40

1 stop13h 01m

£406

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/2

11:45-19:45

1 stop16h 00m

Ontario

Mon 2/3

14:39-11:40

1 stop13h 01m

£406

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 2/5

10:55-16:25

1 stop13h 30m

Ontario

Fri 15/5

13:25-10:00

1 stop12h 35m

£407

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 11/5

10:05-18:37

1 stop16h 32m

Ontario

Thu 15/10

10:57-09:00

1 stop14h 03m

£407

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 12/5

14:25-22:36

1 stop16h 11m

Ontario

Thu 15/10

10:57-09:00

1 stop14h 03m

£407

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 12/8

16:25-00:08

1 stop15h 43m

Ontario

Tue 1/9

16:54-15:05

1 stop14h 11m

£407

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 30/3

10:05-16:22

1 stop14h 17m

Ontario

Sat 25/4

10:55-08:35

1 stop13h 40m

£409

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 12/3

10:15-18:42

1 stop15h 27m

Ontario

Wed 25/3

10:56-06:50

1 stop12h 54m

£410

Flights are sorted by cheapest return flights first.

Deals found on 13/2

Showing 1-10 of 60 results
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Best time to book a flight to Ontario

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

When is the best time to book a flight to Ontario?

Use this chart to determine the optimal time to book a return flight from London to Ontario. Price data was last updated on 13 February 2026.

The price you pay for your flight to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 81 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

How long is the flight to Ontario?

On average, a flight from London to Ontario takes 17 hours 53 minutes. Flights to Ontario from other popular cities in United Kingdom will vary in length. Below are a few examples of popular routes and their flight times.

What are the most popular airlines that fly to Ontario?

The most popular airlines flying from London to Ontario are British Airways, Virgin Atlantic and United Airlines.

British Airways
British Airways
From £356
Virgin Atlantic
Virgin Atlantic
From £368
United Airlines
United Airlines
From £358
Lufthansa
Lufthansa
From £391

What are the cheapest airlines that fly to Ontario?

The cheapest airlines flying from London to Ontario are Finnair, United Airlines and Virgin Atlantic.

Rainfall in Ontario by month

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

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.

Temperature in Ontario by month

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

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated 15 February 2026.
Get a feel of what it's like to fly with Finnair, Virgin Atlantic, andUnited Airlines to the United States by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Overall

7.6

Crew

8.2

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Finnair
7.6
Good
1,362 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Overall

7.6

Crew

8.2

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Virgin Atlantic
7.5
Good
678 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Overall

7.6

Crew

8.2

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
United Airlines
7.4
Good
9,296 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Overall

7.6

Crew

8.2

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Lufthansa
6.8
Okay
7,785 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Overall

7.6

Crew

8.2

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
British Airways
6.7
Okay
7,741 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Boarding

7.7

Overall

7.6

Crew

8.2

Comfort

7.4

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

FAQs about flying to Ontario

Ontario airport overview

At just 3.7km (2.3 miles) east of downtown Ontario, Ontario International Airport  is a small but well-equipped alternative to Los Angeles Airport and John Wayne Airport for passengers flying to California.

The number of flights to Ontario International Airport has been declining steadily in recent years (there were 4.8 million passengers in 2010, but the terminals are built to handle twice that) – some say due to the lack of direct flights to major destinations, in comparison with other airports nearby. However, those who use the airport agree that it is a convenient alternative, well connected to nearby air fields and towns, easy to get in and out of, clean and with good basic facilities.

  • What airport do you fly into for flights to Ontario?

    If you book a flight to Ontario, you will be flying into Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • Can I find cheaper flights to Ontario if I am willing to have stopovers?

    Yes, flights with stopovers are often cheaper than direct flights. Keep an eye out for flight deals to Ontario on Cheapflights that require 1 or 2 stops for potential cost savings.

  • What is the best airline to fly to Ontario?

    Based on reviews from Cheapflights users, Finnair is rated the highest out of the airlines that fly to Ontario.

  • Where does the fastest flight to Ontario depart from?

    For those looking to save time traveling to Ontario, London offers the quickest one-way flight (13 hours 24 minutes).

  • Does Ontario have car hire?

    Yes. Those touching down at Ontario can take advantage of the car hire services offered upon their arrival.

  • Are there hotels close to Ontario?

    Yes. Ontario has hotels nearby for those requiring accommodations. Delta Hotels by Marriott Ontario Airport is the closest property to Ontario (0.0 mi away from Ontario).

See more FAQs

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Search flights to Ontario by cabin class

Find flights to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
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Economy class

Fly with Cheapflights

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

How does Cheapflights help users find flights to Ontario?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights to Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Ontario.

Can Cheapflights find flights to Ontario with no change fees?

Yes, we can. To see specific flights to Ontario with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Yes, Cheapflights offers price alerts on Ontario flights so you can book your flight when prices are ideal. Enable price alerts 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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