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Flights to Ontario

£292 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 6/5. 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
09:00 - 22:45
LHR
-
ONT
21h 45m
2 stops
United Airlines Logo
07:00 - 06:45
ONT
-
LHR
15h 45m
1 stop
£454United Airlines
Sun, 19 Apr - Sun, 26 Apr
United Airlines Logo
07:30 - 21:50
LHR
-
ONT
22h 20m
2 stops
United Airlines Logo
18:59 - 11:10
ONT
-
LHR
32h 11m
1 stop
£455United Airlines
Fri, 17 Apr - Sat, 9 May
British Airways Logo
10:05 - 16:22
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 - 07:55
ONT
-
LHR
12h 56m
1 stop
£465British Airways
Sun, 19 Apr - Wed, 29 Apr
British Airways Logo
10:05 - 16:22
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 - 08:05
ONT
-
LHR
13h 06m
1 stop
£466British Airways
Thu, 16 Apr - Tue, 21 Apr
Multiple Airlines Logo
10:25 - 21:50
LHR
-
ONT
19h 25m
2 stops
Multiple Airlines Logo
13:40 - 06:35
ONT
-
LHR
32h 55m
2 stops
£471Multiple Airlines
Fri, 17 Apr - Sat, 9 May
American Airlines Logo
12:20 - 10:09
LGW
-
ONT
29h 49m
2 stops
American Airlines Logo
06:00 - 10:40
ONT
-
LGW
20h 40m
2 stops
£490American Airlines
Sun, 3 May - Sun, 10 May
Multiple Airlines Logo
12:20 - 23:46
LGW
-
ONT
19h 26m
2 stops
Multiple Airlines Logo
14:08 - 08:40
ONT
-
LGW
34h 32m
2 stops
£512Multiple Airlines
Sun, 10 May - Sat, 16 May
American Airlines Logo
05:55 - 16:22
EDI
-
ONT
18h 27m
2 stops
American Airlines Logo
23:59 - 12:25
ONT
-
EDI
28h 26m
2 stops
£580American Airlines
Wed, 15 Apr - Sun, 19 Apr
KLM Logo
08:55 - 21:00
MAN
-
ONT
20h 05m
2 stops
KLM Logo
07:05 - 08:25
ONT
-
MAN
17h 20m
2 stops
£676KLM
Tue, 5 May - Tue, 12 May
KLM Logo
06:30 - 21:56
LBA
-
ONT
23h 26m
2 stops
KLM Logo
11:55 - 16:50
ONT
-
LBA
20h 55m
2 stops
£743KLM
Wed, 16 Sep - Sat, 3 Oct

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 22 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

Sun 19/4

09:00-22:45

2 stops21h 45m

Ontario

Sun 26/4

07:00-06:45

1 stop15h 45m

£454

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 17/4

07:30-21:50

2 stops22h 20m

Ontario

Sat 9/5

18:59-11:10

1 stop32h 11m

£455
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 19/4

10:05-16:22

1 stop14h 17m

Ontario

Wed 29/4

10:59-07:55

1 stop12h 56m

£465

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 16/4

10:05-16:22

1 stop14h 17m

Ontario

Tue 21/4

10:59-08:05

1 stop13h 06m

£466

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 17/4

10:25-21:50

2 stops19h 25m

Ontario

Sat 9/5

13:40-06:35

2 stops32h 55m

£471

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sun 3/5

12:20-10:09

2 stops29h 49m

Ontario

Sun 10/5

06:00-10:40

2 stops20h 40m

£490

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sun 10/5

12:20-23:46

2 stops19h 26m

Ontario

Sat 16/5

14:08-08:40

2 stops34h 32m

£512

EdinburghOntario

EDI - ONT

EDIONT

Edinburgh Turnhouse

Wed 15/4

05:55-16:22

2 stops18h 27m

Ontario

Sun 19/4

23:59-12:25

2 stops28h 26m

£580

ManchesterOntario

MAN - ONT

MANONT

Manchester

Tue 5/5

08:55-21:00

2 stops20h 05m

Ontario

Tue 12/5

07:05-08:25

2 stops17h 20m

£676

LeedsOntario

LBA - ONT

LBAONT

Leeds/Bradford

Wed 16/9

06:30-21:56

2 stops23h 26m

Ontario

Sat 3/10

11:55-16:50

2 stops20h 55m

£743

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 £408. 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 £418.

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 £508 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 £372 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 AIRPORTFebruary23% cheaperFlying from London Heathrow Airport to Ontario costs on average just £394 in February
MOST EXPENSIVE MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTDecember50% more expensiveIt costs about £764 for flights to Ontario from London Heathrow Airport in December
MOST POPULAR MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTNovember625% 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

£292

Best Round-Trip Price

£454

Fastest flight time

16h 34m

Popular in

December
The best one-way flight price to Ontario from United Kingdom in the last 72 hours is £292 (London Gatwick to Ontario).
Search Deals
The best round-trip flight price to Ontario from United Kingdom in the last 72 hours is £454 (London Heathrow to Ontario).
Search Deals
The fastest flight to Ontario from United Kingdom takes 16h 34m (Belfast City to Ontario).
Search Deals
December has the highest demand for flights to Ontario, with a 0% 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 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 £493. However, in the past 72 hours, people saw flights from United Kingdom for as low as £384.

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 £237/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 £38. This is 85% 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 March 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 £621
Manchester to Ontario Flightsfrom £840
Glasgow to Ontario Flightsfrom £814
Belfast to Ontario Flightsfrom £829
Edinburgh Turnhouse to Ontario Flightsfrom £784
Leeds/Bradford to Ontario Flightsfrom £991
Newcastle upon Tyne to Ontario Flightsfrom £756
Aberdeen Dyce to Ontario Flightsfrom £816