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£346+ 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 28/8. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
10 Jul — 17 Jul1
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 10 June 2026.

Fri 4/906:55
LHR
-
ONT
2 stops21h 58m
United Airlines
Tue 8/913:56
ONT
-
LHR
1 stop13h 14m
United Airlines
Deal found 6/6£417
Wed 8/709:30
LHR
-
ONT
2 stops20h 25m
United Airlines
Mon 13/705:00
ONT
-
LHR
2 stops20h 20m
United Airlines
Deal found 8/6£418
Fri 13/1109:30
LHR
-
ONT
2 stops21h 36m
United Airlines
Tue 17/1106:02
ONT
-
LHR
2 stops16h 18m
United Airlines
Deal found 9/6£419
Fri 20/1109:30
LHR
-
ONT
2 stops21h 36m
United Airlines
Sat 28/1105:00
ONT
-
LHR
1 stop20h 40m
United Airlines
Deal found 6/6£420
Mon 2/1109:30
LHR
-
ONT
2 stops21h 36m
United Airlines
Mon 16/1106:00
ONT
-
LHR
1 stop17h 25m
United Airlines
Deal found 5/6£421
Wed 1/709:30
LHR
-
ONT
2 stops21h 21m
Lufthansa
Thu 30/713:18
ONT
-
LHR
1 stop12h 22m
Lufthansa
Deal found 9/6£432
Fri 2/1015:30
LHR
-
ONT
2 stops38h 29m
United Airlines
Fri 9/1013:52
ONT
-
LHR
1 stop33h 33m
United Airlines
Deal found 9/6£433
Sat 27/613:00
LHR
-
ONT
1 stop17h 50m
Lufthansa
Tue 30/613:50
ONT
-
LHR
1 stop16h 20m
Lufthansa
Deal found 6/6£434
Wed 8/713:40
LHR
-
ONT
1 stop16h 15m
Lufthansa
Mon 13/706:00
ONT
-
LHR
1 stop17h 25m
Lufthansa
Deal found 5/6£434
Sun 14/614:50
LHR
-
ONT
1 stop13h 56m
United Airlines
Sun 28/613:18
ONT
-
LHR
1 stop12h 22m
United Airlines
Deal found 7/6£440
Tue 16/614:50
LHR
-
ONT
1 stop13h 56m
United Airlines
Tue 28/716:20
ONT
-
LHR
1 stop13h 50m
United Airlines
Deal found 9/6£441
Mon 7/910:25
LGW
-
ONT
2 stops19h 27m
Air France
Wed 7/1012:00
ONT
-
LGW
2 stops20h 00m
Air France
Deal found 9/6£508

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 10 June 2026.

Return from

£493

One-way from

£346

Popular in

December

Cheapest in

September

Average price

£501
SWISS
  • SWISS
  • 6/10-17/10
  • 2 total stops
  • 58h 20m total
  • London to Los Angeles
Search Deals
British Airways
  • British Airways
  • 28/8
  • 1 total stop
  • 15h 15m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£20 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 10 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

Fri 4/9

06:55-20:53

2 stops21h 58m

Ontario

Tue 8/9

06:00-08:20

2 stops18h 20m

£417

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 29/6

16:15-22:37

1 stop14h 22m

Ontario

Tue 4/8

13:18-09:40

1 stop12h 22m

£441

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 7/9

13:40-21:59

1 stop16h 19m

Ontario

Thu 17/9

09:01-07:25

1 stop14h 24m

£441

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 17/10

13:40-21:59

1 stop16h 19m

Ontario

Sat 31/10

13:00-09:40

1 stop13h 40m

£441

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/7

10:35-17:54

1 stop15h 19m

Ontario

Sat 18/7

13:18-12:25

1 stop15h 07m

£443

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 13/11

10:15-18:22

1 stop16h 07m

Ontario

Tue 17/11

07:00-08:15

1 stop17h 15m

£490

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 18/7

10:35-18:33

1 stop15h 58m

Ontario

Tue 4/8

05:45-07:55

1 stop18h 10m

£511

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 18/7

10:35-18:33

1 stop15h 58m

Ontario

Fri 24/7

13:18-12:25

1 stop15h 07m

£511

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 23/7

14:50-20:42

1 stop13h 52m

Ontario

Thu 30/7

13:18-12:25

1 stop15h 07m

£511
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 21/8

14:50-20:53

1 stop14h 03m

Ontario

Mon 31/8

13:18-09:40

1 stop12h 22m

£514

Flights are sorted by cheapest return flights first.

Deals found on 5/6

Showing 1-10 of 60 resultsSorted by cheapest first
1
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

How long is the flight to Ontario?

On average, a flight from London to Ontario takes 17 hours 49 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 £372
Virgin Atlantic
Virgin Atlantic
From £375
United Airlines
United Airlines
From £366

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 56 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 10 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
689 reviews
Check prices

Boarding

7.7

Food

6.9

Comfort

7.3

Entertainment

7.5

Overall

7.5

Crew

8.1

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
689 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Boarding

7.7

Food

6.9

Comfort

7.3

Entertainment

7.5

Overall

7.5

Crew

8.1

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
9,807 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Boarding

7.7

Food

6.9

Comfort

7.3

Entertainment

7.5

Overall

7.5

Crew

8.1

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
8,035 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Boarding

7.7

Food

6.9

Comfort

7.3

Entertainment

7.5

Overall

7.5

Crew

8.1

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 £118, while return flights cost around £47.

  • 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 52 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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