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Flights to Ontario

£321 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 27/8. 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
1 adult, Economy, 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 - 22:53
LHR
-
ONT
20h 23m
2 stops
United Airlines Logo
06:46 - 07:55
ONT
-
LHR
17h 09m
1 stop
£419United Airlines
Fri, 30 Oct - Mon, 2 Nov
United Airlines Logo
07:30 - 18:16
LHR
-
ONT
18h 46m
2 stops
United Airlines Logo
13:18 - 20:40
ONT
-
LHR
23h 22m
2 stops
£420United Airlines
Sat, 29 Aug - Wed, 2 Sep
United Airlines Logo
13:40 - 21:55
LHR
-
ONT
16h 15m
1 stop
United Airlines Logo
13:50 - 11:10
ONT
-
LHR
13h 20m
1 stop
£442United Airlines
Thu, 9 Jul - Tue, 14 Jul
Virgin Atlantic Logo
17:10 - 22:02
LHR
-
ONT
36h 52m
2 stops
Virgin Atlantic Logo
06:20 - 10:30
ONT
-
LHR
21h 10m
1 stop
£465Virgin Atlantic
Fri, 23 Oct - Sat, 31 Oct
British Airways Logo
14:45 - 22:19
LHR
-
ONT
15h 34m
1 stop
British Airways Logo
14:42 - 12:15
ONT
-
LHR
13h 33m
1 stop
£473British Airways
Thu, 10 Dec - Thu, 24 Dec
Virgin Atlantic Logo
18:30 - 22:45
LHR
-
ONT
36h 15m
2 stops
Virgin Atlantic Logo
18:00 - 20:10
ONT
-
LHR
18h 10m
2 stops
£474Virgin Atlantic
Tue, 1 Sep - Wed, 16 Sep
China Eastern Logo
17:10 - 22:40
LHR
-
ONT
37h 30m
2 stops
China Eastern Logo
11:54 - 12:10
ONT
-
LHR
16h 16m
1 stop
£476China Eastern
Fri, 11 Sep - Tue, 15 Sep
Iberia Logo
11:30 - 23:36
LGW
-
ONT
20h 06m
2 stops
Iberia Logo
14:22 - 20:00
ONT
-
LGW
21h 38m
2 stops
£485Iberia
Thu, 24 Sep - Thu, 15 Oct
British Airways Logo
11:40 - 23:06
GLA
-
ONT
18h 26m
2 stops
British Airways Logo
14:59 - 15:50
ONT
-
GLA
16h 51m
2 stops
£529British Airways
Fri, 30 Oct - Tue, 3 Nov
Iberia Logo
09:50 - 22:59
LCY
-
ONT
21h 09m
2 stops
Iberia Logo
10:25 - 13:20
ONT
-
LCY
18h 55m
2 stops
£621Iberia
Fri, 4 Sep - Mon, 14 Sep

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 29 June 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 30/10

09:30-22:53

2 stops20h 23m

Ontario

Mon 2/11

06:46-07:55

1 stop17h 09m

£419

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 29/8

07:30-18:16

2 stops18h 46m

Ontario

Wed 2/9

13:18-20:40

2 stops23h 22m

£420

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/7

13:40-21:55

1 stop16h 15m

Ontario

Tue 14/7

13:50-11:10

1 stop13h 20m

£442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 23/10

17:10-22:02

2 stops36h 52m

Ontario

Sat 31/10

06:20-10:30

1 stop21h 10m

£465
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 10/12

14:45-22:19

1 stop15h 34m

Ontario

Thu 24/12

14:42-12:15

1 stop13h 33m

£473

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 1/9

18:30-22:45

2 stops36h 15m

Ontario

Wed 16/9

18:00-20:10

2 stops18h 10m

£474

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/9

17:10-22:40

2 stops37h 30m

Ontario

Tue 15/9

11:54-12:10

1 stop16h 16m

£476

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 24/9

11:30-23:36

2 stops20h 06m

Ontario

Thu 15/10

14:22-20:00

2 stops21h 38m

£485

GlasgowOntario

GLA - ONT

GLAONT

Glasgow Intl

Fri 30/10

11:40-23:06

2 stops18h 26m

Ontario

Tue 3/11

14:59-15:50

2 stops16h 51m

£529

LondonOntario

LCY - ONT

LCYONT

London City

Fri 4/9

09:50-22:59

2 stops21h 09m

Ontario

Mon 14/9

10:25-13:20

2 stops18h 55m

£621

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 September is, on average, the cheapest month to fly to Ontario from United Kingdom, with most prices found around £423. If you’re not able to fly to Ontario in September, then March is your next best option. Flight prices from United Kingdom to Ontario during March average around £426.

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 £504 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 £376 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 AIRPORTFebruary20% cheaperFlying from London Heathrow Airport to Ontario costs on average just £404 in February
MOST EXPENSIVE MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTJuly25% more expensiveIt costs about £633 for flights to Ontario from London Heathrow Airport in July
MOST POPULAR MONTH TO FLY TO ONTARIO FROM LONDON HEATHROW AIRPORTApril485% more users visitedMore momondo users searched in flights to Ontario from London Heathrow Airport in April than any other month

Cheap Ontario flight deals and tips

Summary info about Ontario flight prices, duration and airlines

Best One-Way Price

£321

Best Round-Trip Price

£419

Fastest flight time

18h 29m

Popular in

December
The best one-way flight price to Ontario from United Kingdom in the last 5 days is £321 (London Gatwick to Ontario).
Search Deals
The best round-trip flight price to Ontario from United Kingdom in the last 5 days is £419 (London Heathrow to Ontario).
Search Deals
The fastest flight to Ontario from United Kingdom takes 18h 29m (Manchester to Ontario).
Search Deals
December has the highest demand for flights to Ontario, with a 29% price increase on average.
Search Deals

Frequently asked questions about flying to Ontario

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 £90/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 £62. This is 59% 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 June 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 £584
Manchester to Ontario Flightsfrom £703
Newcastle upon Tyne to Ontario Flightsfrom £734
Edinburgh Turnhouse to Ontario Flightsfrom £689
Glasgow to Ontario Flightsfrom £698
Belfast to Ontario Flightsfrom £755
Leeds/Bradford to Ontario Flightsfrom £892
Aberdeen Dyce to Ontario Flightsfrom £852