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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 6/5. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
13 Apr — 20 Apr1
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 14 March 2026.

Mon 30/310:35
LHR
-
ONT
1 stop15h 12m
United Airlines
Sat 25/407:00
ONT
-
LHR
1 stop17h 30m
United Airlines
Deal found 9/3£367
Thu 23/409:30
LHR
-
ONT
2 stops20h 20m
United Airlines
Thu 30/407:00
ONT
-
LHR
2 stops19h 40m
United Airlines
Deal found 9/3£419
Mon 16/311:35
LHR
-
ONT
1 stop16h 15m
United Airlines
Mon 30/313:34
ONT
-
LHR
1 stop14h 51m
United Airlines
Deal found 9/3£429
Fri 17/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Sun 3/510:54
ONT
-
LHR
1 stop13h 11m
British Airways
Deal found 10/3£430
Tue 17/313:45
LHR
-
ONT
1 stop16h 12m
United Airlines
Mon 23/313:40
ONT
-
LHR
1 stop15h 20m
United Airlines
Deal found 9/3£431
Fri 24/410:50
LHR
-
ONT
2 stops19h 55m
United Airlines
Fri 1/513:40
ONT
-
LHR
1 stop14h 40m
United Airlines
Deal found 10/3£437
Mon 27/407:30
LHR
-
ONT
2 stops22h 20m
United Airlines
Sat 9/506:00
ONT
-
LHR
1 stop24h 10m
United Airlines
Deal found 10/3£438
Sun 26/407:25
LHR
-
ONT
2 stops18h 22m
United Airlines
Sun 3/510:37
ONT
-
LHR
1 stop16h 33m
United Airlines
Deal found 12/3£439
Thu 19/311:35
LHR
-
ONT
1 stop16h 15m
United Airlines
Wed 1/413:34
ONT
-
LHR
1 stop15h 01m
United Airlines
Deal found 10/3£441
Fri 1/514:10
LHR
-
ONT
1 stop16h 25m
United Airlines
Tue 5/506:00
ONT
-
LHR
1 stop17h 25m
United Airlines
Deal found 9/3£441
Sun 23/816:20
LCY
-
ONT
2 stops34h 05m
British Airways
Wed 2/906:10
ONT
-
LCY
2 stops21h 20m
British Airways
Deal found 9/3£513
Thu 23/411:30
LGW
-
ONT
2 stops20h 16m
Iberia
Thu 30/414:08
ONT
-
LGW
2 stops36h 42m
Iberia
Deal found 9/3£527

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 14 March 2026.

Return from

£363

One-way from

£346

Popular in

December

Cheapest in

September

Average price

£460
Finnair
  • Finnair
  • 23/4-20/5
  • 2 total stops
  • 35h 30m total
  • London to Los Angeles
Search Deals
British Airways
  • British Airways
  • 6/5
  • 1 total stop
  • 15h 21m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£34 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for return flights in March 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 14 March 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 1/5

14:50-20:36

1 stop13h 46m

Ontario

Tue 5/5

18:59-21:35

2 stops18h 36m

£441

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 3/4

14:50-20:36

1 stop13h 46m

Ontario

Tue 21/4

13:34-12:25

1 stop14h 51m

£454

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 6/5

14:10-22:35

1 stop16h 25m

Ontario

Wed 13/5

13:30-11:10

1 stop13h 40m

£463

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/7

14:50-20:42

1 stop13h 52m

Ontario

Sun 19/7

13:50-14:10

1 stop16h 20m

£465

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 25/6

14:50-20:42

1 stop13h 52m

Ontario

Sun 28/6

13:18-12:20

1 stop15h 02m

£466
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/4

14:50-20:36

1 stop13h 46m

Ontario

Wed 15/4

13:27-11:10

1 stop13h 43m

£466

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 13/6

13:40-21:55

1 stop16h 15m

Ontario

Tue 30/6

13:18-09:40

1 stop12h 22m

£466

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 23/6

10:35-17:56

1 stop15h 21m

Ontario

Tue 7/7

13:18-09:40

1 stop12h 22m

£466

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

14:50-20:36

1 stop13h 46m

Ontario

Wed 29/4

13:38-12:35

1 stop14h 57m

£479

LondonOntario

LCY - ONT

LCYONT

London City

Sun 23/8

16:20-18:25

2 stops34h 05m

Ontario

Wed 2/9

06:10-11:30

2 stops21h 20m

£513

Flights are sorted by cheapest return flights first.

Deals found on 11/3

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

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 March 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 17 hours 43 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 £379
United Airlines
United Airlines
From £369
Lufthansa
Lufthansa
From £403

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 14 March 2026.
Get a feel of what it's like to fly with Virgin Atlantic,United Airlines, andLufthansa 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
680 reviews
Check prices

Overall

7.5

Crew

8.2

Entertainment

7.6

Food

6.9

Comfort

7.3

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
680 reviews
Virgin Atlantic
7.5
Good
680 reviews
Check prices

Overall

7.5

Crew

8.2

Entertainment

7.6

Food

6.9

Comfort

7.3

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
9,423 reviews
Virgin Atlantic
7.5
Good
680 reviews
Check prices

Overall

7.5

Crew

8.2

Entertainment

7.6

Food

6.9

Comfort

7.3

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
Lufthansa
6.8
Okay
7,848 reviews
Virgin Atlantic
7.5
Good
680 reviews
Check prices

Overall

7.5

Crew

8.2

Entertainment

7.6

Food

6.9

Comfort

7.3

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
7,786 reviews
Virgin Atlantic
7.5
Good
680 reviews
Check prices

Overall

7.5

Crew

8.2

Entertainment

7.6

Food

6.9

Comfort

7.3

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 24 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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