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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 20/5. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
22 May — 29 May1
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 22 April 2026.

Tue 17/1116:30
LHR
-
ONT
1 stop15h 27m
British Airways
Tue 1/1216:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 21/4£458
Wed 6/510:05
LHR
-
ONT
1 stop14h 17m
British Airways
Mon 11/510:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 22/4£460
Mon 27/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Mon 4/510:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 21/4£464
Mon 25/516:10
LHR
-
ONT
2 stops35h 46m
American Airlines
Mon 1/622:00
ONT
-
LHR
2 stops24h 50m
American Airlines
Deal found 21/4£469
Wed 4/1112:55
LHR
-
ONT
2 stops18h 53m
Virgin Atlantic
Wed 18/1107:00
ONT
-
LHR
1 stop16h 35m
Virgin Atlantic
Deal found 20/4£476
Wed 22/710:55
LHR
-
ONT
1 stop13h 40m
Virgin Atlantic
Wed 29/711:48
ONT
-
LHR
1 stop17h 27m
Virgin Atlantic
Deal found 19/4£477
Mon 17/808:15
LHR
-
ONT
2 stops18h 42m
Multiple Airlines
Thu 27/807:20
ONT
-
LHR
1 stop20h 50m
Multiple Airlines
Deal found 19/4£477
Mon 17/810:05
LHR
-
ONT
1 stop16h 42m
British Airways
Thu 27/810:29
ONT
-
LHR
1 stop14h 31m
British Airways
Deal found 19/4£478
Wed 11/1110:00
LHR
-
ONT
1 stop20h 43m
Virgin Atlantic
Sat 14/1112:00
ONT
-
LHR
1 stop34h 25m
Virgin Atlantic
Deal found 22/4£480
Fri 29/511:40
LHR
-
ONT
1 stop18h 54m
Virgin Atlantic
Mon 8/613:48
ONT
-
LHR
1 stop14h 22m
Virgin Atlantic
Deal found 21/4£481
Thu 31/1210:00
LHR
-
ONT
1 stop15h 17m
Multiple Airlines
Sat 9/112:00
ONT
-
LHR
1 stop13h 00m
Multiple Airlines
Deal found 20/4£483
Tue 21/411:30
LGW
-
ONT
2 stops39h 07m
British Airways
Mon 27/410:59
ONT
-
LGW
2 stops25h 01m
British Airways
Deal found 18/4£542

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 22 April 2026.

Return from

£392

One-way from

£309

Popular in

December

Cheapest in

September

Average price

£475
British Airways
  • British Airways
  • 15/8-8/9
  • Nonstop
  • 21h 50m total
  • London to Los Angeles
Search Deals
1/6
  • 1/6
  • 2 total stops
  • 33h 44m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£26 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£10 potential savings vs. average return price).
Search Deals
Average for return flights in April 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 22 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

Sat 4/7

17:45-22:41

1 stop36h 56m

Ontario

Wed 15/7

18:01-15:35

1 stop13h 34m

£504

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 19/8

14:25-22:58

1 stop16h 33m

Ontario

Tue 1/9

07:06-06:20

1 stop15h 14m

£507

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 14/9

09:20-18:01

1 stop16h 41m

Ontario

Tue 22/9

17:55-15:35

1 stop13h 40m

£508

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 28/9

13:40-21:58

1 stop16h 18m

Ontario

Fri 9/10

09:39-07:25

1 stop13h 46m

£510

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 28/9

13:40-21:58

1 stop16h 18m

Ontario

Thu 8/10

13:18-12:25

1 stop15h 07m

£571

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 12/5

16:15-22:59

1 stop14h 44m

Ontario

Wed 15/7

13:50-11:10

1 stop13h 20m

£594

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 15/5

14:10-22:35

1 stop16h 25m

Ontario

Sun 31/5

13:50-11:10

1 stop13h 20m

£594

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sat 6/6

10:25-22:32

2 stops20h 07m

Ontario

Sat 13/6

06:20-09:20

2 stops19h 00m

£613

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 20/7

11:25-20:42

1 stop17h 17m

Ontario

Tue 4/8

13:18-09:40

1 stop12h 22m

£619

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 28/7

13:40-21:55

1 stop16h 15m

Ontario

Tue 4/8

13:50-11:10

1 stop13h 20m

£620

Flights are sorted by cheapest return flights first.

Deals found on 19/4

Showing 1-10 of 59 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

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 17 April 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 76 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 3 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 £366
Virgin Atlantic
Virgin Atlantic
From £372
United Airlines
United Airlines
From £362

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 22 April 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
687 reviews
Check prices

Entertainment

7.5

Crew

8.1

Comfort

7.3

Overall

7.5

Food

6.9

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Jorge,Jun 2025

SFO - LHR

Exceptional, the flight attendant were amazing. My economy delight seat was very comfortable, and I was fortunate enough to have an empty row
Virgin Atlantic
7.5
Good
687 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Crew

8.1

Comfort

7.3

Overall

7.5

Food

6.9

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Jorge,Jun 2025

SFO - LHR

Exceptional, the flight attendant were amazing. My economy delight seat was very comfortable, and I was fortunate enough to have an empty row
United Airlines
7.4
Good
9,632 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Crew

8.1

Comfort

7.3

Overall

7.5

Food

6.9

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Jorge,Jun 2025

SFO - LHR

Exceptional, the flight attendant were amazing. My economy delight seat was very comfortable, and I was fortunate enough to have an empty row
British Airways
6.7
Okay
7,906 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Entertainment

7.5

Crew

8.1

Comfort

7.3

Overall

7.5

Food

6.9

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Jorge,Jun 2025

SFO - LHR

Exceptional, the flight attendant were amazing. My economy delight seat was very comfortable, and I was fortunate enough to have an empty row

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 22 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

Browse thousands of different options on Cheapflights for your next trip

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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 flights to Ontario
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Economy class flights to Ontario

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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