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£305+ 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 1/6. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
19 May — 26 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 19 April 2026.

Wed 11/1115:00
LHR
-
ONT
1 stop15h 23m
British Airways
Wed 18/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 17/4£476
Tue 28/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 5/510:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 17/4£488
Tue 10/1106:00
LHR
-
ONT
2 stops20h 22m
British Airways
Tue 17/1114:59
ONT
-
LHR
1 stop13h 01m
British Airways
Deal found 17/4£491
Wed 11/1107:35
LHR
-
ONT
2 stops22h 48m
British Airways
Tue 17/1114:59
ONT
-
LHR
1 stop13h 01m
British Airways
Deal found 17/4£492
Tue 30/610:55
LHR
-
ONT
1 stop13h 47m
Multiple Airlines
Sat 8/813:00
ONT
-
LHR
1 stop13h 00m
Multiple Airlines
Deal found 17/4£497
Sat 17/1011:40
LHR
-
ONT
1 stop19h 03m
Virgin Atlantic
Sat 7/1107:00
ONT
-
LHR
1 stop15h 25m
Virgin Atlantic
Deal found 18/4£498
Tue 23/606:30
LHR
-
ONT
2 stops18h 49m
Delta
Sat 4/706:00
ONT
-
LHR
1 stop20h 00m
Delta
Deal found 18/4£498
Tue 23/606:15
LHR
-
ONT
2 stops18h 27m
Virgin Atlantic
Sat 4/713:00
ONT
-
LHR
2 stops18h 35m
Virgin Atlantic
Deal found 18/4£504
Thu 5/1115:00
LHR
-
ONT
1 stop15h 23m
British Airways
Wed 18/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 17/4£506
Wed 9/914:25
LHR
-
ONT
1 stop14h 43m
British Airways
Thu 5/1114:59
ONT
-
LHR
1 stop13h 16m
British Airways
Deal found 18/4£507
Tue 10/1115:00
LHR
-
ONT
1 stop15h 23m
British Airways
Wed 18/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 17/4£508
Tue 21/411:30
LGW
-
ONT
2 stops30h 39m
British Airways
Tue 28/410:59
ONT
-
LGW
2 stops25h 01m
British Airways
Deal found 18/4£541

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 19 April 2026.

Return from

£392

One-way from

£305

Popular in

December

Cheapest in

September

Average price

£469
British Airways
  • British Airways
  • 15/8-7/9
  • Nonstop
  • 21h 45m 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 (£28 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 19 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

Tue 23/6

06:15-16:42

2 stops18h 27m

Ontario

Sat 4/7

13:00-15:35

2 stops18h 35m

£504

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 7/7

17:45-22:45

1 stop37h 00m

Ontario

Sun 19/7

11:59-15:35

1 stop19h 36m

£522

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Fri 29/5

10:25-21:48

2 stops19h 23m

Ontario

Fri 5/6

13:35-16:00

2 stops18h 25m

£543

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 1/10

11:40-23:44

2 stops20h 04m

Ontario

Wed 7/10

13:00-15:35

2 stops18h 35m

£557
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 23/9

14:25-21:08

1 stop14h 43m

Ontario

Mon 12/10

13:31-10:30

1 stop12h 59m

£559

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 10/8

11:00-18:15

1 stop15h 15m

Ontario

Tue 15/9

14:22-12:50

1 stop14h 28m

£561

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 12/8

14:25-21:12

1 stop14h 47m

Ontario

Tue 15/9

14:22-12:50

1 stop14h 28m

£561

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 10/9

16:15-22:58

1 stop14h 43m

Ontario

Wed 30/9

13:33-11:10

1 stop13h 37m

£572

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 5/5

14:10-22:35

1 stop16h 25m

Ontario

Tue 19/5

13:30-11:10

1 stop13h 40m

£572

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 21/5

10:25-22:34

2 stops20h 09m

Ontario

Sat 6/6

13:35-16:00

2 stops18h 25m

£587

Flights are sorted by cheapest return flights first.

Deals found on 18/4

Showing 1-10 of 60 resultsSorted by cheapest first
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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 10 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 15 hours 59 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 19 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

Overall

7.5

Crew

8.1

Food

6.9

Comfort

7.3

Entertainment

7.5

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

Overall

7.5

Crew

8.1

Food

6.9

Comfort

7.3

Entertainment

7.5

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
9,604 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Overall

7.5

Crew

8.1

Food

6.9

Comfort

7.3

Entertainment

7.5

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
7,891 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Overall

7.5

Crew

8.1

Food

6.9

Comfort

7.3

Entertainment

7.5

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 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

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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