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Flights to Ontario

£324 Cheap flights to Ontario

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight to Ontario departing on 15/4. 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.
United Airlines Logo
09:30 - 21:58
LHR
-
ONT
20h 28m
2 stops
United Airlines Logo
05:00 - 07:15
ONT
-
LHR
18h 15m
2 stops
£440United Airlines
Tue, 5 May - Tue, 19 May
United Airlines Logo
13:40 - 21:55
LHR
-
ONT
16h 15m
1 stop
United Airlines Logo
13:44 - 11:10
ONT
-
LHR
13h 26m
1 stop
£451United Airlines
Tue, 4 Aug - Tue, 18 Aug
United Airlines Logo
14:50 - 20:36
LHR
-
ONT
13h 46m
1 stop
United Airlines Logo
13:34 - 12:25
ONT
-
LHR
14h 51m
1 stop
£452United Airlines
Mon, 13 Apr - Mon, 27 Apr
Air Canada Logo
09:30 - 12:38
LHR
-
ONT
35h 08m
2 stops
Air Canada Logo
05:00 - 06:30
ONT
-
LHR
17h 30m
2 stops
£486Air Canada
Sat, 9 May - Tue, 12 May
Virgin Atlantic Logo
10:55 - 16:25
LHR
-
ONT
13h 30m
1 stop
Virgin Atlantic Logo
17:50 - 12:10
ONT
-
LHR
34h 20m
1 stop
£506Virgin Atlantic
Sat, 2 May - Fri, 8 May
Iberia Logo
11:30 - 23:06
LGW
-
ONT
19h 36m
2 stops
Iberia Logo
14:22 - 20:00
ONT
-
LGW
21h 38m
2 stops
£585Iberia
Thu, 1 Oct - Thu, 22 Oct
British Airways Logo
19:00 - 18:38
LCY
-
ONT
31h 38m
2 stops
British Airways Logo
07:00 - 11:30
ONT
-
LCY
20h 30m
2 stops
£587British Airways
Mon, 18 May - Tue, 26 May
Iberia Logo
11:30 - 23:06
LGW
-
ONT
19h 36m
2 stops
Iberia Logo
14:22 - 20:00
ONT
-
LGW
21h 38m
2 stops
£587Iberia
Tue, 29 Sep - Tue, 20 Oct
British Airways Logo
19:00 - 18:38
LCY
-
ONT
31h 38m
2 stops
British Airways Logo
07:00 - 11:30
ONT
-
LCY
20h 30m
2 stops
£595British Airways
Mon, 11 May - Tue, 26 May
Virgin Atlantic Logo
06:30 - 22:37
LBA
-
ONT
24h 07m
2 stops
Virgin Atlantic Logo
12:08 - 09:30
ONT
-
LBA
37h 22m
2 stops
£859Virgin Atlantic
Mon, 20 Apr - Sun, 10 May

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 4 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 5/5

09:30-21:58

2 stops20h 28m

Ontario

Tue 19/5

05:00-07:15

2 stops18h 15m

£440

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/8

13:40-21:55

1 stop16h 15m

Ontario

Tue 18/8

13:44-11:10

1 stop13h 26m

£451
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

14:50-20:36

1 stop13h 46m

Ontario

Mon 27/4

13:34-12:25

1 stop14h 51m

£452

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 9/5

09:30-12:38

2 stops35h 08m

Ontario

Tue 12/5

05:00-06:30

2 stops17h 30m

£486

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 2/5

10:55-16:25

1 stop13h 30m

Ontario

Fri 8/5

17:50-12:10

1 stop34h 20m

£506

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 1/10

11:30-23:06

2 stops19h 36m

Ontario

Thu 22/10

14:22-20:00

2 stops21h 38m

£585

LondonOntario

LCY - ONT

LCYONT

London City

Mon 18/5

19:00-18:38

2 stops31h 38m

Ontario

Tue 26/5

07:00-11:30

2 stops20h 30m

£587

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Tue 29/9

11:30-23:06

2 stops19h 36m

Ontario

Tue 20/10

14:22-20:00

2 stops21h 38m

£587

LondonOntario

LCY - ONT

LCYONT

London City

Mon 11/5

19:00-18:38

2 stops31h 38m

Ontario

Tue 26/5

07:00-11:30

2 stops20h 30m

£595

LeedsOntario

LBA - ONT

LBAONT

Leeds/Bradford

Mon 20/4

06:30-22:37

2 stops24h 07m

Ontario

Sun 10/5

12:08-09:30

2 stops37h 22m

£859

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 September is, on average, the cheapest month to fly to Ontario from United Kingdom, with most prices found around £412. If you’re not able to fly to Ontario in September, then February is your next best option. Flight prices from United Kingdom to Ontario during February average around £422.

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 £523 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 £375 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 AIRPORTFebruary24% cheaperFlying from London Heathrow Airport to Ontario costs on average just £398 in February
MOST EXPENSIVE MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTDecember47% more expensiveIt costs about £771 for flights to Ontario from London Heathrow Airport in December
MOST POPULAR MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTNovember569% 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

£324

Best Round-Trip Price

£440

Fastest flight time

14h 43m

Popular in

December
The best one-way flight price to Ontario from United Kingdom in the last 72 hours is £324 (London Gatwick to Ontario).
Search Deals
The best round-trip flight price to Ontario from United Kingdom in the last 72 hours is £440 (London Heathrow to Ontario).
Search Deals
The fastest flight to Ontario from United Kingdom takes 14h 43m (London Heathrow to Ontario).
Search Deals
December has the highest demand for flights to Ontario, with a 0% price increase on average.
Search Deals

Frequently asked questions about flying to Ontario

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

Most flyers found that booking tickets 77 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 £499. However, in the past 72 hours, people saw flights from United Kingdom for as low as £387.

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 Santa Ana J. Wayne/Orange Cnty 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 Las Vegas for £57. This is 77% 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 3 as of April 2026.

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 £687
Manchester to Ontario Flightsfrom £837
Glasgow to Ontario Flightsfrom £848
Belfast to Ontario Flightsfrom £865
Edinburgh Turnhouse to Ontario Flightsfrom £912
Leeds/Bradford to Ontario Flightsfrom £933
Newcastle upon Tyne to Ontario Flightsfrom £852
Aberdeen Dyce to Ontario Flightsfrom £811