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£379+ 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 4/11. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
24 Jun — 1 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 19 June 2025.

Return from

£376

One-way from

£421

Popular in

August

Cheapest in

February

Average price

£497
Air Canada
  • Air Canada
  • 30/10-14/11
  • 4 total stops
  • 37h 32m total
  • London to Los Angeles
Iberia
  • Iberia
  • 1/9
  • 1 total stop
  • 15h 42m total
  • London to Ontario
Highest demand for flights based on searches. 10% potential increase in price (£40 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 June 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 19 June 2025.

Tue 4/1114:55LHR - ONT
1 stop15h 05mBritish Airways
Tue 25/1117:01ONT - LHR
1 stop12h 19mBritish Airways
Deal found 17/6£379
Sat 1/1106:20LHR - ONT
2 stops23h 26mVirgin Atlantic
Sat 8/1113:00ONT - LHR
1 stop13h 00mVirgin Atlantic
Deal found 16/6£384
Mon 24/1106:30LHR - ONT
2 stops18h 47mDelta
Fri 5/1211:29ONT - LHR
1 stop15h 31mDelta
Deal found 18/6£395
Mon 25/815:05LGW - ONT
2 stops52h 27mMultiple Airlines
Sat 20/906:10ONT - LGW
2 stops18h 00mMultiple Airlines
Deal found 17/6£405
Thu 30/1009:20LHR - ONT
1 stop17h 22mKLM
Wed 12/1112:00ONT - LHR
1 stop14h 35mKLM
Deal found 17/6£409
Wed 27/812:00LGW - ONT
2 stops39h 11mKLM
Fri 5/907:05ONT - LGW
2 stops18h 55mKLM
Deal found 17/6£421
Sat 23/812:00LHR - ONT
1 stop14h 24mAmerican Airlines
Thu 4/912:46ONT - LHR
1 stop14h 04mAmerican Airlines
Deal found 16/6£428
Tue 15/710:05LHR - ONT
2 stops19h 33mFinnair
Mon 21/700:59ONT - LHR
2 stops21h 56mFinnair
Deal found 16/6£447
Tue 15/709:15LHR - ONT
1 stop20h 23mMultiple Airlines
Tue 22/710:53ONT - LHR
1 stop14h 07mMultiple Airlines
Deal found 17/6£461
Fri 4/710:30LHR - ONT
1 stop16h 31mIberia
Tue 8/712:46ONT - LHR
1 stop17h 39mIberia
Deal found 17/6£486
Fri 27/612:00LGW - ONT
2 stops18h 25mDelta
Sat 5/711:49ONT - LGW
2 stops38h 11mDelta
Deal found 18/6£492
Wed 29/1015:00LHR - ONT
2 stops38h 45mAir Canada
Wed 5/1105:40ONT - LHR
2 stops21h 40mAir Canada
Deal found 16/6£510

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 19 June 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

Tue 4/11

14:55-22:00

1 stop15h 05m

Ontario

Tue 25/11

17:01-13:20

1 stop12h 19m

£379

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 1/11

06:20-22:46

2 stops23h 26m

Ontario

Sat 8/11

13:00-10:00

1 stop13h 00m

£384

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 24/11

06:30-22:42

2 stops24h 12m

Ontario

Fri 5/12

06:00-12:15

2 stops22h 15m

£395

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Mon 25/8

15:05-11:32

2 stops52h 27m

Ontario

Sat 20/9

06:10-08:10

2 stops18h 00m

£405

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 30/10

09:20-19:42

1 stop17h 22m

Ontario

Wed 12/11

12:00-10:35

1 stop14h 35m

£409

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Wed 27/8

12:00-19:11

2 stops39h 11m

Ontario

Fri 5/9

07:05-10:00

2 stops18h 55m

£421

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 23/8

12:00-18:24

1 stop14h 24m

Ontario

Thu 4/9

12:46-10:50

1 stop14h 04m

£428

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 15/7

10:05-21:38

2 stops19h 33m

Ontario

Tue 22/7

08:15-06:25

1 stop14h 10m

£447

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 15/7

09:15-21:38

1 stop20h 23m

Ontario

Tue 22/7

10:53-09:00

1 stop14h 07m

£461

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 4/7

10:30-19:01

1 stop16h 31m

Ontario

Tue 8/7

12:46-14:25

1 stop17h 39m

£486

Flights are sorted by cheapest return flights first.

Deals found on 17/6

Showing 1-10 of 39 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 13 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 16 hours 35 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, KLM 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 19 June 2025.
Read reviews from past customers who have flown Delta, KLM and Finnair to Ontario. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

8.0

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

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

8.0

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

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

8.0

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

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

8.0

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

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

8.0

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

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

8.0

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 £131, while return flights cost around £64.

  • 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 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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