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£392+ Cheap flights to Ontario

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/8. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
13 Jul — 20 Jul1
1 adult

Flights to Ontario in 2025

Find the latest flights to Ontario in 2025, 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 8 July 2025.

Return from

£372

One-way from

£435

Popular in

August

Cheapest in

February

Average price

£582
Norse Atlantic UK
  • Norse Atlantic UK
  • 27/8-27/8
  • Nonstop
  • 21h 40m total
  • London to Los Angeles
British Airways
  • British Airways
  • 28/10
  • 1 total stop
  • 15h 06m total
  • London to Ontario
Highest demand for flights based on searches. 9% potential increase in price (£38 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Average for return flights in July 2025

Find flight deals to Ontario

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 8 July 2025.

Sun 24/810:55LHR - ONT
1 stop20h 45mKLM
Tue 9/911:40ONT - LHR
1 stop18h 35mKLM
Deal found 7/7£392
Thu 28/815:05LGW - ONT
2 stops28h 27mMultiple Airlines
Wed 10/906:10ONT - LGW
2 stops18h 00mMultiple Airlines
Deal found 6/7£413
Sun 24/810:55LHR - ONT
1 stop20h 45mVirgin Atlantic
Tue 9/906:05ONT - LHR
2 stops40h 20mVirgin Atlantic
Deal found 7/7£416
Sun 31/815:10LHR - ONT
1 stop15h 04mFinnair
Sat 13/914:54ONT - LHR
1 stop13h 51mFinnair
Deal found 6/7£419
Fri 26/912:00LHR - ONT
1 stop14h 54mBritish Airways
Wed 8/1016:49ONT - LHR
1 stop12h 01mBritish Airways
Deal found 8/7£425
Mon 24/1119:05LHR - ONT
2 stops22h 23mIberia
Fri 5/1210:57ONT - LHR
1 stop15h 03mIberia
Deal found 7/7£428
Tue 25/1106:30LHR - ONT
2 stops24h 12mDelta
Fri 5/1211:29ONT - LHR
1 stop15h 31mDelta
Deal found 7/7£430
Mon 1/915:40LHR - ONT
1 stop13h 59mAmerican Airlines
Wed 17/916:45ONT - LHR
1 stop12h 05mAmerican Airlines
Deal found 8/7£443
Wed 3/912:00LHR - ONT
1 stop14h 54mMultiple Airlines
Tue 9/912:45ONT - LHR
1 stop14h 05mMultiple Airlines
Deal found 6/7£476
Sun 10/816:20LCY - ONT
2 stops51h 32mBritish Airways
Thu 21/810:50ONT - LCY
2 stops19h 35mBritish Airways
Deal found 6/7£535
Sat 15/1119:35LGW - ONT
2 stops30h 14mBritish Airways
Fri 21/1108:46ONT - LGW
2 stops26h 04mBritish Airways
Deal found 7/7£576
Thu 21/812:00LGW - ONT
2 stops42h 20mKLM
Mon 1/907:05ONT - LGW
2 stops42h 55mKLM
Deal found 7/7£609

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 8 July 2025.
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

Sun 24/8

10:55-23:40

1 stop20h 45m

Ontario

Tue 9/9

11:40-14:15

1 stop18h 35m

£392

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 28/8

15:05-11:32

2 stops28h 27m

Ontario

Wed 10/9

06:10-08:10

2 stops18h 00m

£413

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 24/8

10:55-23:40

1 stop20h 45m

Ontario

Tue 9/9

06:05-06:25

2 stops40h 20m

£416

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 31/8

15:10-22:14

1 stop15h 04m

Ontario

Sat 13/9

14:54-12:45

1 stop13h 51m

£419

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 26/9

12:00-18:54

1 stop14h 54m

Ontario

Wed 8/10

16:49-12:50

1 stop12h 01m

£425

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 24/11

19:05-09:28

2 stops22h 23m

Ontario

Fri 5/12

10:57-10:00

1 stop15h 03m

£428

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 25/11

06:30-22:41

2 stops24h 11m

Ontario

Fri 5/12

06:00-12:15

2 stops22h 15m

£430

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 1/9

15:40-21:39

1 stop13h 59m

Ontario

Wed 17/9

16:45-12:50

1 stop12h 05m

£443

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 3/9

12:00-18:54

1 stop14h 54m

Ontario

Tue 9/9

12:45-10:50

1 stop14h 05m

£476

LondonOntario

LCY - ONT

LCYONT

London City

Sun 10/8

16:20-11:52

2 stops51h 32m

Ontario

Thu 21/8

10:50-14:25

2 stops19h 35m

£535

Flights are sorted by cheapest return flights first.

Deals found on 7/7

Showing 1-10 of 35 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 27 June 2025.

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 77 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 37 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 cheapest airlines that fly to Ontario?

The cheapest airlines flying from London to Ontario are Finnair, British Airways and KLM.

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 8 July 2025.
Get a feel of what it's like to fly with Delta, KLM, andFinnair 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.

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
8.0
Very Good

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

  • 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 £38, while return flights cost around £63.

  • How much is a return flight to Ontario?

    A return flight to Ontario will typically cost around £98, however they can be found for as little as £86.

  • 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 34 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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