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£360+ Cheap flights to Ontario (ONT)

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 28/9. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
28 May — 4 Jun1
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 28 April 2026.

Tue 17/1116:30
LHR
-
ONT
1 stop15h 27m
British Airways
Tue 24/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 24/4£458
Wed 29/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Thu 7/510:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 25/4£460
Sat 5/910:55
LHR
-
ONT
1 stop19h 49m
Virgin Atlantic
Sat 19/913:00
ONT
-
LHR
1 stop13h 00m
Virgin Atlantic
Deal found 25/4£461
Mon 4/510:05
LHR
-
ONT
1 stop14h 17m
British Airways
Mon 11/510:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 26/4£462
Tue 15/911:40
LHR
-
ONT
2 stops20h 04m
Virgin Atlantic
Sat 19/917:55
ONT
-
LHR
1 stop34h 15m
Virgin Atlantic
Deal found 23/4£469
Wed 23/1216:30
LHR
-
ONT
1 stop15h 16m
British Airways
Thu 7/115:09
ONT
-
LHR
1 stop12h 51m
British Airways
Deal found 24/4£470
Wed 16/914:25
LHR
-
ONT
1 stop14h 43m
British Airways
Mon 21/913:31
ONT
-
LHR
1 stop12h 59m
British Airways
Deal found 24/4£471
Sat 30/510:55
LHR
-
ONT
1 stop19h 50m
Virgin Atlantic
Thu 4/613:35
ONT
-
LHR
1 stop18h 00m
Virgin Atlantic
Deal found 25/4£473
Thu 21/510:55
LHR
-
ONT
1 stop20h 39m
Virgin Atlantic
Thu 28/511:52
ONT
-
LHR
1 stop19h 43m
Virgin Atlantic
Deal found 23/4£474
Mon 27/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 12/510:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 24/4£475
Tue 28/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 12/510:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 23/4£476
Tue 12/506:45
LCY
-
ONT
2 stops22h 09m
Multiple Airlines
Tue 19/507:30
ONT
-
LCY
2 stops20h 00m
Multiple Airlines
Deal found 24/4£512

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 28 April 2026.

Return from

£408

One-way from

£360

Popular in

December

Cheapest in

September

Average price

£475
American Airlines
  • American Airlines
  • 8/5-1/9
  • 1 total stop
  • 25h 05m total
  • London to Los Angeles
Search Deals
British Airways
  • British Airways
  • 28/9
  • 2 total stops
  • 22h 53m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£25 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 April 2026
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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 28 April 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 9/9

14:25-21:08

1 stop14h 43m

Ontario

Tue 27/10

16:59-13:15

1 stop13h 16m

£498

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 7/9

14:25-21:12

1 stop14h 47m

Ontario

Mon 21/9

16:59-15:05

1 stop14h 06m

£500

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 21/5

06:15-18:36

2 stops20h 21m

Ontario

Thu 28/5

13:35-13:50

2 stops16h 15m

£507
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 28/5

10:55-16:17

1 stop13h 22m

Ontario

Sat 14/11

13:00-10:00

1 stop13h 00m

£509

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 15/10

07:25-10:03

2 stops34h 38m

Ontario

Fri 11/12

06:02-11:05

2 stops21h 03m

£567

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 10/7

11:05-22:51

1 stop19h 46m

Ontario

Sat 3/10

07:00-06:45

1 stop15h 45m

£592

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Mon 18/5

10:25-22:34

2 stops20h 09m

Ontario

Sun 24/5

13:35-16:00

2 stops18h 25m

£596

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 29/7

10:35-17:56

1 stop15h 21m

Ontario

Tue 25/8

13:44-11:10

1 stop13h 26m

£619

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 30/5

07:25-17:56

2 stops18h 31m

Ontario

Thu 4/6

13:18-12:25

1 stop15h 07m

£622

LondonOntario

LCY - ONT

LCYONT

London City

Tue 1/9

08:10-18:47

2 stops42h 37m

Ontario

Mon 28/9

14:22-09:00

2 stops34h 38m

£628

Flights are sorted by cheapest return flights first.

Deals found on 26/4

Showing 1-10 of 60 resultsSorted by cheapest first
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2
3
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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

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 55 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 15 hours 36 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 £365
Virgin Atlantic
Virgin Atlantic
From £370
United Airlines
United Airlines
From £361

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).

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 28 April 2026.
Get a feel of what it's like to fly with United Airlines,Virgin Atlantic, 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.
United Airlines
7.4
Good
9,680 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Tim,Sept 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.
United Airlines
7.4
Good
9,680 reviews
United Airlines
7.4
Good
9,680 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Tim,Sept 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.
Virgin Atlantic
7.4
Good
688 reviews
United Airlines
7.4
Good
9,680 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Tim,Sept 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.
British Airways
6.7
Okay
7,931 reviews
United Airlines
7.4
Good
9,680 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Tim,Sept 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.

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.

  • 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 19 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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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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