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Flights to Ontario

£261 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 26/1. 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.
American Airlines Logo
12:30 - 10:07LGW-ONT
29h 37m2 stops
American Airlines Logo
22:40 - 09:00ONT-LGW
26h 20m2 stops
£406American Airlines
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Wed, 18 Feb - Sun, 22 Feb
American Airlines Logo
11:20 - 16:05LGW-ONT
36h 45m2 stops
American Airlines Logo
06:22 - 09:00ONT-LGW
18h 38m2 stops
£406American Airlines
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Thu, 15 Jan - Wed, 28 Jan
Virgin Atlantic Logo
12:20 - 22:51LHR-ONT
18h 31m1 stop
Virgin Atlantic Logo
07:30 - 11:55ONT-LHR
20h 25m1 stop
£409Virgin Atlantic
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Mon, 12 Jan - Mon, 19 Jan
British Airways Logo
08:20 - 22:49LHR-ONT
22h 29m1 stop
British Airways Logo
17:06 - 13:15ONT-LHR
12h 09m1 stop
£416British Airways
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Fri, 20 Feb - Wed, 25 Feb
British Airways Logo
10:35 - 18:45LHR-ONT
16h 10m1 stop
British Airways Logo
17:06 - 13:15ONT-LHR
12h 09m1 stop
£418British Airways
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Sat, 7 Feb - Wed, 25 Feb
Virgin Atlantic Logo
10:45 - 21:48LHR-ONT
18h 03m1 stop
Virgin Atlantic Logo
11:59 - 14:15ONT-LHR
18h 16m1 stop
£419Virgin Atlantic
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Sat, 28 Mar - Tue, 7 Apr
United Airlines Logo
09:25 - 21:59EDI-ONT
20h 34m2 stops
United Airlines Logo
06:00 - 07:55ONT-EDI
17h 55m2 stops
£524United Airlines
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Tue, 13 Jan - Tue, 20 Jan
KLM Logo
20:05 - 21:05LCY-ONT
33h 00m2 stops
KLM Logo
22:30 - 07:15ONT-LCY
24h 45m2 stops
£531KLM
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Mon, 12 Jan - Mon, 19 Jan
United Airlines Logo
06:00 - 21:58MAN-ONT
23h 58m2 stops
United Airlines Logo
06:00 - 12:20ONT-MAN
22h 20m2 stops
£536United Airlines
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Wed, 14 Jan - Wed, 21 Jan
KLM Logo
17:20 - 16:09GLA-ONT
30h 49m2 stops
KLM Logo
07:30 - 16:35ONT-GLA
25h 05m2 stops
£672KLM
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Sun, 14 Dec - Sat, 24 Jan

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 30 November 2025.
Use the filters below to find and compare flights to Ontario that are best for you.

Fly from

Route

Depart

Return

Price

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Wed 18/2

12:30-10:07

2 stops29h 37m

Ontario

Sun 22/2

22:40-09:00

2 stops26h 20m

£406

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 15/1

11:20-16:05

2 stops36h 45m

Ontario

Wed 28/1

06:22-09:00

2 stops18h 38m

£406

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 12/1

12:20-22:51

1 stop18h 31m

Ontario

Mon 19/1

07:30-11:55

1 stop20h 25m

£409

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/2

08:20-22:49

1 stop22h 29m

Ontario

Wed 25/2

17:06-13:15

1 stop12h 09m

£416

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/2

10:35-18:45

1 stop16h 10m

Ontario

Wed 25/2

17:06-13:15

1 stop12h 09m

£418

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/3

10:45-21:48

1 stop18h 03m

Ontario

Tue 7/4

11:59-14:15

1 stop18h 16m

£419

EdinburghOntario

EDI - ONT

EDIONT

Edinburgh Turnhouse

Tue 13/1

09:25-21:59

2 stops20h 34m

Ontario

Tue 20/1

06:00-07:55

2 stops17h 55m

£524

LondonOntario

LCY - ONT

LCYONT

London City

Mon 12/1

20:05-21:05

2 stops33h 00m

Ontario

Mon 19/1

22:30-07:15

2 stops24h 45m

£531

ManchesterOntario

MAN - ONT

MANONT

Manchester

Wed 14/1

06:00-21:58

2 stops23h 58m

Ontario

Wed 21/1

06:00-12:20

2 stops22h 20m

£536

GlasgowOntario

GLA - ONT

GLAONT

Glasgow Intl

Sun 14/12

17:20-16:09

2 stops30h 49m

Ontario

Sat 24/1

07:30-16:35

2 stops25h 05m

£672

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 January is, on average, the cheapest month to fly to Ontario from United Kingdom, with most prices found around £416. 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 £417.

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 £497. 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 £574. 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 £486 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 £571.

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 £545 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 £398 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 £433 in September
MOST EXPENSIVE MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTDecember41% more expensiveIt costs about £773 for flights to Ontario from London Heathrow Airport in December
MOST POPULAR MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTNovember620% 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

£261

Best Round-Trip Price

£406

Fastest flight time

20h 28m

Popular in

December
The best one-way flight price to Ontario from United Kingdom in the last 72 hours is £261 (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 £406 (London Gatwick to Ontario).
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The fastest flight to Ontario from United Kingdom takes 20h 28m (Manchester to Ontario).
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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 £544. However, in the past 72 hours, people saw flights from United Kingdom for as low as £381.

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 £196/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 £57. This is 73% 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 November 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

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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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
Manchester to Ontario Flightsfrom £685
London to Ontario Flightsfrom £537
Edinburgh Turnhouse to Ontario Flightsfrom £693
Newcastle upon Tyne to Ontario Flightsfrom £680
Glasgow to Ontario Flightsfrom £674
Belfast to Ontario Flightsfrom £692
Aberdeen Dyce to Ontario Flightsfrom £1,173
Leeds/Bradford to Ontario Flightsfrom £773