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Flights to Ontario

£293 Cheap flights to Ontario

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight to Ontario departing on 13/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from the United Kingdom to Ontario

Cheap return flights

Enter your travel dates to find the best prices.
Delta Logo
13:05 - 20:58
LHR
-
ONT
15h 53m1 stop
Delta Logo
07:00 - 06:45
ONT
-
LHR
15h 45m1 stop
£293Delta
Mon, 13 Apr - Wed, 22 Apr
Delta Logo
13:05 - 20:58
LHR
-
ONT
15h 53m1 stop
Delta Logo
12:39 - 13:30
ONT
-
LHR
16h 51m1 stop
£295Delta
Mon, 13 Apr - Fri, 24 Apr
United Airlines Logo
11:35 - 20:50
LHR
-
ONT
17h 15m1 stop
United Airlines Logo
06:00 - 07:30
ONT
-
LHR
17h 30m1 stop
£302United Airlines
Sat, 21 Feb - Sat, 28 Feb
American Airlines Logo
10:05 - 17:46
LHR
-
ONT
15h 41m1 stop
American Airlines Logo
15:05 - 14:25
ONT
-
LHR
15h 20m1 stop
£306American Airlines
Sun, 12 Apr - Wed, 22 Apr
American Airlines Logo
10:05 - 17:45
LHR
-
ONT
15h 40m1 stop
American Airlines Logo
15:05 - 14:25
ONT
-
LHR
15h 20m1 stop
£310American Airlines
Sat, 11 Apr - Thu, 16 Apr
United Airlines Logo
13:00 - 22:45
LHR
-
ONT
17h 45m1 stop
United Airlines Logo
13:27 - 14:10
ONT
-
LHR
16h 43m1 stop
£315United Airlines
Fri, 10 Apr - Fri, 24 Apr
British Airways Logo
09:50 - 22:07
GLA
-
ONT
19h 17m2 stops
British Airways Logo
17:02 - 16:40
ONT
-
GLA
16h 38m2 stops
£446British Airways
Tue, 10 Mar - Thu, 19 Mar
British Airways Logo
06:05 - 18:42
EDI
-
ONT
19h 37m2 stops
British Airways Logo
17:02 - 18:45
ONT
-
EDI
18h 43m2 stops
£448British Airways
Tue, 10 Mar - Thu, 19 Mar
Iberia Logo
19:40 - 14:18
LGW
-
ONT
26h 38m2 stops
Iberia Logo
10:58 - 19:00
ONT
-
LGW
24h 02m2 stops
£520Iberia
Sat, 17 Jan - Mon, 2 Feb
Iberia Logo
11:45 - 14:18
LGW
-
ONT
34h 33m2 stops
Iberia Logo
07:16 - 10:50
ONT
-
LGW
19h 34m2 stops
£527Iberia
Sat, 17 Jan - Sat, 7 Feb

momondo Fare Finder

 
Locate flights to Ontario that fit your budget, with regularly updated fares and availability. In the last 7 days, momondo users made a total of 279,928 searches and data was last updated on 23 December 2025.
Use the filters below to find and compare flights to Ontario that are best for you.

Fly from

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

13:05-20:58

1 stop15h 53m

Ontario

Wed 22/4

07:00-06:45

1 stop15h 45m

£293

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

13:05-20:58

1 stop15h 53m

Ontario

Fri 24/4

12:39-13:30

1 stop16h 51m

£295

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 21/2

11:35-20:50

1 stop17h 15m

Ontario

Sat 28/2

06:00-07:30

1 stop17h 30m

£302

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 12/4

10:05-17:46

1 stop15h 41m

Ontario

Wed 22/4

15:05-14:25

1 stop15h 20m

£306

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 11/4

10:05-17:45

1 stop15h 40m

Ontario

Thu 16/4

15:05-14:25

1 stop15h 20m

£310

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 10/4

13:00-22:45

1 stop17h 45m

Ontario

Fri 24/4

13:27-14:10

1 stop16h 43m

£315

GlasgowOntario

GLA - ONT

GLAONT

Glasgow Intl

Tue 10/3

09:50-22:07

2 stops19h 17m

Ontario

Thu 19/3

17:02-16:40

2 stops16h 38m

£446

EdinburghOntario

EDI - ONT

EDIONT

Edinburgh Turnhouse

Tue 10/3

06:05-18:42

2 stops19h 37m

Ontario

Thu 19/3

17:02-18:45

2 stops18h 43m

£448

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sat 17/1

19:40-14:18

2 stops26h 38m

Ontario

Mon 2/2

10:58-19:00

2 stops24h 02m

£520

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sat 17/1

11:45-14:18

2 stops34h 33m

Ontario

Sat 7/2

07:16-10:50

2 stops19h 34m

£527

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Ontario from

Ontario flights insights and trends

Explore insights for your Ontario flight to craft the best travel plan

What is the cheapest month to fly to Ontario?

The month of January is, on average, the cheapest month to fly to Ontario from United Kingdom, with most prices found around £410. If you’re not able to fly to Ontario in January, then September is your next best option. Flight prices from United Kingdom to Ontario during September average around £410.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Wednesday when prices can be found for as low as £490. This is often the case because there is less demand to fly during this day of the week. Flights from United Kingdom to Ontario on a Sunday will generally be more expensive and average around £566. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Ontario?

Flying to Ontario from United Kingdom in the evening is the least expensive time of day to depart. momondo users have found prices as low as £479 when looking at flights departing in the evening. In contrast, the most expensive time of day to depart to Ontario is at midday when prices are around £563.

How far in advance should I book a flight to Ontario?

You are more likely to see cheaper flights to Ontario from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around £536 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from United Kingdom for as low as £392 on momondo.

Cheapest flights to Ontario

Find the cheapest flights to Ontario from your nearest city or airport
Find flights from London Heathrow Airport to Ontario
CHEAPEST MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTSeptember21% cheaperFlying from London Heathrow Airport to Ontario costs on average just £426 in September
MOST EXPENSIVE MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTDecember41% more expensiveIt costs about £759 for flights to Ontario from London Heathrow Airport in December
MOST POPULAR MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTNovember600% more users visitedMore momondo users searched in flights to Ontario from London Heathrow Airport in November than any other month

Cheap Ontario flight deals and tips

Summary info about Ontario flight prices, duration and airlines

Best One-Way Price

£310

Best Round-Trip Price

£293

Fastest flight time

18h 56m

Popular in

December
The best one-way flight price to Ontario from United Kingdom in the last 72 hours is £310 (London Heathrow to Ontario).
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The best round-trip flight price to Ontario from United Kingdom in the last 72 hours is £293 (London Heathrow to Ontario).
Search Deals
The fastest flight to Ontario from United Kingdom takes 18h 56m (Edinburgh Turnhouse to Ontario).
Search Deals
December has the highest demand for flights to Ontario, with a 2% price increase on average.
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Frequently asked questions about flying to Ontario

How far in advance should I book a flight to Ontario?

Most flyers found that booking tickets 81 days in advance of their planned departure date is the best time to get cheap flights to Ontario. During this timeframe, flight prices are around £533. However, in the past 72 hours, people saw flights from United Kingdom for as low as £375.

Is there an alternative airport near Ontario?

Ontario Airport, San Bernardino Int Airport, Santa Ana J. Wayne/Orange Cnty Airport, Long Beach Municipal Airport or Burbank Bob Hope Airport can be an alternative airport used for travel to Ontario.

Is there a cheaper alternative to flying into Ontario?

The cheapest airport near Ontario is typically Burbank Bob Hope Airport, with an average price of £239/person. These prices vary based on where travellers are coming from. It is suggested that travellers looking to save money try momondo’s Airport-to-Airport Pricing Tool.

What is the absolute cheapest flight to Ontario?

The best deal found on momondo in the last two weeks was a flight to Ontario from San Francisco for £21. This is 92% cheaper than most flight deals to Ontario. To find the cheapest price to Ontario from your area, use momondo’s Airport-to-Airport Pricing Tool.

When did momondo last update prices for flights to Ontario Airport?

Prices for flights to Ontario Airport are updated daily.

How many operators does momondo search for flights to Ontario Airport?

The number of operators available for flights to Ontario Airport is 6 as of December 2025.

How old do you have to be to fly to Ontario Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal to Ontario?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario.

Can I find flights to Ontario with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for flights to Ontario to just show those with flexible booking policies.

How can momondo help me find flights to Ontario?

momondo helps you find the best flight to Ontario by providing filters to narrow your choice of flights to those matching your criteria. You can select fights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight to Ontario right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Ontario, momondo offers a useful price alert feature which will track prices for flights to Ontario and alert you when they change.

An easier way to manage your Ontario trip

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Find better results for your trip to Ontario

Popular Flights to Ontario

Popular routes according to searches in the past day on momondo
London to Ontario Flightsfrom £478
Manchester to Ontario Flightsfrom £633
Edinburgh Turnhouse to Ontario Flightsfrom £627
Newcastle upon Tyne to Ontario Flightsfrom £602
Aberdeen Dyce to Ontario Flightsfrom £626
Belfast to Ontario Flightsfrom £640
Glasgow to Ontario Flightsfrom £647
Leeds/Bradford to Ontario Flightsfrom £903