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£321+ 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 27/8. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
27 Jul — 3 Aug1
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 27 June 2026.

Fri 30/1009:30
LHR
-
ONT
2 stops20h 23m
United Airlines
Mon 2/1106:46
ONT
-
LHR
1 stop17h 09m
United Airlines
Deal found 24/6£419
Sat 29/807:30
LHR
-
ONT
2 stops18h 46m
United Airlines
Wed 2/913:18
ONT
-
LHR
2 stops23h 22m
United Airlines
Deal found 24/6£420
Sun 25/1007:30
LHR
-
ONT
2 stops20h 26m
United Airlines
Sat 31/1005:00
ONT
-
LHR
1 stop21h 40m
United Airlines
Deal found 23/6£421
Thu 9/713:40
LHR
-
ONT
1 stop16h 15m
United Airlines
Tue 14/713:50
ONT
-
LHR
1 stop13h 20m
United Airlines
Deal found 25/6£442
Thu 2/713:40
LHR
-
ONT
1 stop16h 15m
United Airlines
Wed 15/713:50
ONT
-
LHR
2 stops32h 55m
United Airlines
Deal found 24/6£443
Wed 23/910:35
LHR
-
ONT
1 stop15h 41m
United Airlines
Wed 30/913:24
ONT
-
LHR
1 stop12h 16m
United Airlines
Deal found 24/6£444
Thu 9/713:40
LHR
-
ONT
1 stop16h 15m
United Airlines
Wed 15/713:18
ONT
-
LHR
1 stop15h 17m
United Airlines
Deal found 23/6£444
Mon 29/614:50
LHR
-
ONT
1 stop13h 52m
United Airlines
Sun 12/713:50
ONT
-
LHR
1 stop16h 20m
United Airlines
Deal found 22/6£445
Fri 3/714:25
LHR
-
ONT
1 stop16h 07m
British Airways
Sat 25/713:11
ONT
-
LHR
1 stop13h 54m
British Airways
Deal found 21/6£448
Wed 23/909:30
LHR
-
ONT
2 stops35h 16m
Air Canada
Sun 27/905:00
ONT
-
LHR
2 stops17h 30m
Air Canada
Deal found 22/6£449
Fri 3/710:05
LHR
-
ONT
1 stop17h 54m
British Airways
Fri 31/712:35
ONT
-
LHR
1 stop16h 15m
British Airways
Deal found 24/6£460
Sat 4/710:00
LHR
-
ONT
1 stop19h 57m
Lufthansa
Sat 11/713:18
ONT
-
LHR
1 stop12h 22m
Lufthansa
Deal found 24/6£460

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 27 June 2026.

Return from

£457

One-way from

£321

Popular in

December

Cheapest in

September

Average price

£552
4/9-13/9
  • 4/9-13/9
  • 4 total stops
  • 49h 30m total
  • London to Los Angeles
Search Deals
27/8
  • 27/8
  • 3 total stops
  • 50h 24m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£14 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for return flights in June 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 27 June 2026.
Use the filters below to find and compare flights to Ontario that are best for you.

Fly from

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 23/9

11:25-20:53

1 stop17h 28m

Ontario

Sun 27/9

13:52-14:10

1 stop16h 18m

£444

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/7

13:40-21:55

1 stop16h 15m

Ontario

Sat 18/7

13:18-12:25

1 stop15h 07m

£444

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 30/8

13:40-21:59

1 stop16h 19m

Ontario

Mon 7/9

13:18-09:40

1 stop12h 22m

£444

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/7

13:40-21:55

1 stop16h 15m

Ontario

Sat 18/7

13:18-12:25

1 stop15h 07m

£444

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 10/9

13:00-20:01

1 stop15h 01m

Ontario

Wed 30/9

13:24-09:40

1 stop12h 16m

£444

LondonOntario

LCY - ONT

LCYONT

London City

Fri 11/9

08:25-22:40

2 stops22h 15m

Ontario

Tue 15/9

13:04-16:40

2 stops19h 36m

£528

LondonOntario

LCY - ONT

LCYONT

London City

Fri 21/8

09:20-22:45

2 stops21h 25m

Ontario

Mon 31/8

11:56-16:40

2 stops20h 44m

£540

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 30/10

09:30-22:53

2 stops20h 23m

Ontario

Mon 2/11

06:46-07:55

1 stop17h 09m

£552

LondonOntario

LCY - ONT

LCYONT

London City

Thu 6/8

10:00-22:45

2 stops20h 45m

Ontario

Wed 12/8

06:20-09:30

2 stops19h 10m

£554

LondonOntario

LCY - ONT

LCYONT

London City

Sat 29/8

07:45-16:24

2 stops16h 39m

Ontario

Mon 31/8

11:56-16:40

2 stops20h 44m

£558

Flights are sorted by cheapest return flights first.

Deals found on 26/6

Showing 1-10 of 60 resultsSorted by cheapest first
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2
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6

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

How long is the flight to Ontario?

On average, a flight from London to Ontario takes 17 hours 4 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 £377
Virgin Atlantic
Virgin Atlantic
From £380
United Airlines
United Airlines
From £371

What are the cheapest airlines that fly to Ontario?

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

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).

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

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 60 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 27 June 2026.
Get a feel of what it's like to fly with Virgin Atlantic,United Airlines, andBritish Airways 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.
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Comfort

7.3

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Virgin Atlantic
7.5
Good
690 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Comfort

7.3

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
United Airlines
7.4
Good
9,898 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Comfort

7.3

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
British Airways
6.7
Okay
8,072 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Crew

8.1

Boarding

7.7

Overall

7.5

Food

6.9

Comfort

7.3

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

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, United Airlines is rated the highest out of the airlines that fly to Ontario.

  • What is the cheapest airport to fly to in Ontario?

    Ontario is currently the cheapest airport to fly to in Ontario. One-way flights to Ontario typically cost £120, while return flights cost around £48.

  • How much is a return flight to Ontario?

    A return flight to Ontario will typically cost around £104, however they can be found for as little as £48.

  • 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 29 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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First Class flights to Ontario
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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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