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£372+ 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 28/10. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
7 Jun — 14 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 8 May 2026.

Wed 11/1115:00
LHR
-
ONT
1 stop15h 23m
British Airways
Tue 24/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 3/5£457
Tue 3/1116:30
LHR
-
ONT
1 stop15h 27m
British Airways
Tue 24/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 5/5£467
Mon 2/1115:00
LHR
-
ONT
1 stop15h 23m
British Airways
Mon 23/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 4/5£468
Thu 5/1110:45
LHR
-
ONT
1 stop13h 27m
Virgin Atlantic
Sat 14/1113:00
ONT
-
LHR
1 stop13h 00m
Virgin Atlantic
Deal found 3/5£469
Sat 3/1010:55
LHR
-
ONT
1 stop20h 49m
Virgin Atlantic
Fri 16/1007:00
ONT
-
LHR
1 stop22h 15m
Virgin Atlantic
Deal found 7/5£471
Tue 9/610:55
LHR
-
ONT
1 stop13h 46m
Virgin Atlantic
Thu 23/707:05
ONT
-
LHR
1 stop15h 20m
Virgin Atlantic
Deal found 7/5£473
Thu 5/1110:45
LHR
-
ONT
1 stop13h 27m
Air France
Sat 14/1112:00
ONT
-
LHR
1 stop13h 00m
Air France
Deal found 3/5£476
Tue 7/711:40
LHR
-
ONT
2 stops53h 49m
British Airways
Sun 12/723:59
ONT
-
LHR
1 stop25h 01m
British Airways
Deal found 4/5£477
Sat 5/907:25
LHR
-
ONT
2 stops18h 46m
United Airlines
Sat 19/913:18
ONT
-
LHR
1 stop12h 22m
United Airlines
Deal found 4/5£484
Mon 5/1007:30
LHR
-
ONT
2 stops23h 29m
United Airlines
Thu 15/1006:05
ONT
-
LHR
1 stop17h 20m
United Airlines
Deal found 6/5£485
Wed 23/914:25
LHR
-
ONT
1 stop14h 43m
British Airways
Sun 27/923:59
ONT
-
LHR
1 stop25h 06m
British Airways
Deal found 4/5£485
Tue 7/719:00
LCY
-
ONT
2 stops46h 29m
British Airways
Mon 13/710:25
ONT
-
LCY
2 stops20h 50m
British Airways
Deal found 4/5£502

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 8 May 2026.

Return from

£444

One-way from

£391

Popular in

December

Cheapest in

September

Average price

£452
Lufthansa
  • Lufthansa
  • 4/9-13/9
  • 1 total stop
  • 26h 20m total
  • London to Los Angeles
Search Deals
25/8
  • 25/8
  • 3 total stops
  • 59h 38m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£24 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 May 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 8 May 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 5/8

11:45-23:34

2 stops19h 49m

Ontario

Thu 13/8

11:56-13:15

1 stop17h 19m

£496

LondonOntario

LCY - ONT

LCYONT

London City

Tue 7/7

19:00-09:29

2 stops46h 29m

Ontario

Mon 13/7

10:25-15:15

2 stops20h 50m

£502

LondonOntario

LCY - ONT

LCYONT

London City

Thu 9/7

17:00-09:29

2 stops48h 29m

Ontario

Mon 13/7

10:25-15:15

2 stops20h 50m

£540

LondonOntario

LCY - ONT

LCYONT

London City

Wed 3/6

13:30-22:39

2 stops41h 09m

Ontario

Mon 8/6

05:45-11:30

2 stops21h 45m

£546

LondonOntario

LCY - ONT

LCYONT

London City

Wed 3/6

13:30-23:59

2 stops42h 29m

Ontario

Sun 7/6

23:59-11:30

2 stops27h 31m

£546

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 13/5

10:05-16:22

1 stop14h 17m

Ontario

Thu 16/7

13:10-11:05

1 stop13h 55m

£571

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 6/6

10:55-16:17

1 stop13h 22m

Ontario

Sun 14/6

06:20-15:35

1 stop25h 15m

£574

LondonOntario

LCY - ONT

LCYONT

London City

Fri 5/6

09:20-23:34

2 stops22h 14m

Ontario

Mon 8/6

13:00-16:40

2 stops19h 40m

£594

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 15/6

14:50-20:46

1 stop13h 56m

Ontario

Mon 29/6

13:18-12:25

1 stop15h 07m

£618

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 21/7

13:40-21:55

1 stop16h 15m

Ontario

Wed 29/7

13:50-11:10

1 stop13h 20m

£618

Flights are sorted by cheapest return flights first.

Deals found on 8/5

Showing 1-10 of 60 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?

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 16 hours 41 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 £364
Virgin Atlantic
Virgin Atlantic
From £369
United Airlines
United Airlines
From £360

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 8 May 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
9,694 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

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
9,694 reviews
United Airlines
7.4
Good
9,694 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

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
9,694 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

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
7,952 reviews
United Airlines
7.4
Good
9,694 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

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 27 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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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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