Find flights
When to book
Airlines
FAQs

Cheap flights from London to Ontario from £218

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 26/1. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ONT
4 Jan — 11 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London to Ontario are usually found in January or September, booked 81 days in advance, depart on a Wednesday or Tuesday and return on a Monday

Cheap flight deals from London to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from London to Ontario
Explore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 December 2025.

Mon 8/1214:45LHR - ONT
1 stop16h 02mVirgin Atlantic
Mon 15/1213:29ONT - LHR
1 stop12h 31mVirgin Atlantic
Deal found 3/12£459
Mon 15/1214:45LHR - ONT
1 stop16h 02mVirgin Atlantic
Fri 16/113:11ONT - LHR
1 stop12h 49mVirgin Atlantic
Deal found 3/12£468
Thu 25/1210:45LHR - ONT
1 stop19h 48mVirgin Atlantic
Mon 2/206:00ONT - LHR
1 stop20h 00mVirgin Atlantic
Deal found 4/12£477
Sat 6/1215:05LHR - ONT
1 stop15h 42mVirgin Atlantic
Tue 9/1213:29ONT - LHR
1 stop12h 31mVirgin Atlantic
Deal found 3/12£480
Thu 11/1206:30LHR - ONT
2 stops21h 09mDelta
Wed 14/106:00ONT - LHR
2 stops16h 20mDelta
Deal found 4/12£495
Wed 24/1210:45LHR - ONT
1 stop19h 48mDelta
Sat 10/113:11ONT - LHR
1 stop12h 49mDelta
Deal found 3/12£501
Thu 11/1212:20LHR - ONT
1 stop18h 27mDelta
Tue 13/113:11ONT - LHR
1 stop12h 49mDelta
Deal found 4/12£508
Sun 7/1210:45LHR - ONT
1 stop16h 54mDelta
Sun 11/122:30ONT - LHR
1 stop25h 20mDelta
Deal found 4/12£510
Thu 4/1210:45LHR - ONT
1 stop21h 13mDelta
Sat 7/313:10ONT - LHR
1 stop12h 50mDelta
Deal found 4/12£510
Mon 8/1212:20LHR - ONT
1 stop18h 27mVirgin Atlantic
Mon 11/509:55ONT - LHR
1 stop15h 55mVirgin Atlantic
Deal found 3/12£514
Thu 4/1210:45LHR - ONT
1 stop21h 13mVirgin Atlantic
Tue 9/1213:29ONT - LHR
1 stop12h 31mVirgin Atlantic
Deal found 3/12£516
Thu 4/1210:45LHR - ONT
1 stop21h 13mVirgin Atlantic
Thu 11/1212:40ONT - LHR
1 stop13h 50mVirgin Atlantic
Deal found 3/12£517

Find flight deals from London to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 5 December 2025.

Round-trip from

£414

One-way from

£218

Popular in

July

Cheapest in

January

Average price

£627
British Airways
  • British Airways
  • 7/2-28/2
  • 2 total stops
  • 27h 57m total
  • London to Ontario
Search Deals
26/1
  • 26/1
  • 2 total stops
  • 33h 07m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£113 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£25 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 5 December 2025.
Use the filters below to find and compare flights from London to Ontario that are best for you.

Fly from

London

Fly to

Ontario

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/3

06:30-21:04

2 stops21h 34m

Ontario

Sat 11/4

22:30-06:45

1 stop24h 15m

£462

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/3

10:45-21:48

1 stop18h 03m

Ontario

Sat 11/4

13:20-14:00

2 stops16h 40m

£474

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 3/4

11:20-17:13

1 stop13h 53m

Ontario

Mon 13/4

13:00-09:50

1 stop12h 50m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 5/4

10:55-21:04

1 stop18h 09m

Ontario

Wed 15/4

11:55-09:00

1 stop13h 05m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 17/1

06:30-22:51

2 stops24h 21m

Ontario

Sat 24/1

13:10-10:00

1 stop12h 50m

£484

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 18/1

06:30-21:05

2 stops22h 35m

Ontario

Sun 25/1

22:30-08:45

2 stops26h 15m

£484

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/4

13:05-21:04

1 stop15h 59m

Ontario

Tue 14/4

07:00-06:30

1 stop15h 30m

£492

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/4

10:55-21:04

1 stop18h 09m

Ontario

Mon 13/4

22:59-06:30

1 stop23h 31m

£492

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 6/4

10:55-21:04

1 stop18h 09m

Ontario

Thu 16/4

12:00-13:30

1 stop17h 30m

£492

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 3/4

13:05-21:04

1 stop15h 59m

Ontario

Fri 17/4

22:59-13:30

1 stop30h 31m

£492

Flights are sorted by cheapest return flights first.

Deals found on 2/12

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from London to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from London with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Ontario

How far ahead should I book a flight from London to Ontario?

Use this chart to determine the optimal time to book a return flight from London to Ontario. Price data was last updated on 28 November 2025.

To ensure you get the cheapest price possible for a flight from London to Ontario, you should look to book at least 81 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London to Ontario?

Currently, September is the cheapest month in which you can book a flight from London to Ontario (average of £240). Flying from London to Ontario in July is currently the most expensive (average of £405). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LON to ONT?

Find hourly flight availability from London to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 December 2025.

It’s optimal to fly from London to Ontario in the evening. By choosing this option you can save up to 24% on the cost of your flight, compared to a flight at midday.

What’s the top stopover airport for flights from London to Ontario?

Share of one-stop return flights from London to Ontario chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Dallas (DFW) – chosen by Cheapflights users on 29% of one-stop itineraries from London to Ontario on Cheapflights.

What’s the cheapest stopover airport for flights from London to Ontario?

Average return fare for one-stop flights from London to Ontario, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Lisbon (LIS) is the most affordable one-stop option, with an average return flight price of £395.

What’s the fastest stopover option from London to Ontario?

Shortest average travel time for one-stop one-way flights from London to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Salt Lake City (SLC) have the shortest average one-way travel time for one-stop routes: 13h 34m.

Which airport typically offers the quickest stopover for flights from London to Ontario?

Average stopover duration for one-stop one-way flights from London to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Salt Lake City (SLC) offer the fastest connection on this route, with an average stopover time of 1h 10m.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated 5 December 2025.
Read through reviews of airlines operating flights from London to Ontario, such as Finnair, Virgin Atlantic, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

Entertainment

6.9

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Finnair
7.6
Good
1,334 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

Entertainment

6.9

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Virgin Atlantic
7.5
Good
675 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

Entertainment

6.9

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
United Airlines
7.4
Good
9,065 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

Entertainment

6.9

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Lufthansa
6.8
Okay
7,615 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

Entertainment

6.9

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
British Airways
6.7
Okay
7,562 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Crew

8.1

Food

6.7

Comfort

7.4

Entertainment

6.9

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Related info for your journey

Find useful and relevant information for your journey from London to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from London?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from London. On average, Ontario has 0 inbound flights from London per day from 6 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

  • How long is the flight from London to Ontario?

    Airlines like Delta, Virgin Atlantic, and Iberia fly from London to Ontario in about 18h 03m. The time it takes to get you to your destination can typically vary by up to 16h 30m. The distance from London to Ontario is about 5407 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from London to Ontario round-trip?

    According to our current data, Finnair (£281), Virgin Atlantic (£377), and British Airways (£388) offers the cheapest pricing from London to Ontario. You may be able to fly from London to Ontario for 47% less than the average price by searching for these airlines.

  • What are the most popular routes from London to Ontario?

    The most popular route from London to Ontario is London Heathrow - Ontario. You may also consider London Gatwick - Ontario or London City - Ontario.

  • Can I find deals for flights from London to Ontario that include hotel bookings?

    Yes. In addition to deals on London to Ontario flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Ontario.

  • Can I find deals for business class flights from London to Ontario?

    Yes. Cheapflights offers flight deals from London to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London to Ontario?

    Currently, September is the cheapest month in which you can book a flight from London to Ontario (average of £240). Flying from London to Ontario in July is currently the most expensive (average of £405). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for London to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Los Angeles flights
Heathrow to San Francisco flights
Heathrow to Las Vegas flights
Gatwick to Los Angeles flights
London City to Los Angeles flights
Gatwick to San Francisco flights
Stansted to Los Angeles flights
Heathrow to Ontario flights
Luton to Los Angeles flights
Gatwick to Las Vegas flights
London City to San Francisco flights
Heathrow to Santa Ana flights
London City to Las Vegas flights
Stansted to San Francisco flights
Heathrow to San Diego flights
Heathrow to San Jose flights
Heathrow to Burbank flights
Heathrow to Oakland flights
Stansted to Las Vegas flights
Luton to San Francisco flights
Heathrow to Long Beach flights
Manchester to Las Vegas flights
Manchester to Los Angeles flights
Gatwick to San Jose flights
Gatwick to Oakland flights
Luton to Las Vegas flights
Gatwick to San Diego flights
Gatwick to Burbank flights
London City to San Diego flights
Gatwick to Santa Ana flights
Southend to Los Angeles flights
Manchester to San Francisco flights
Birmingham to Las Vegas flights
Manchester to Santa Ana flights
Manchester to Ontario flights
London City to Burbank flights
Manchester to Burbank flights
Manchester to Oakland flights
Stansted to San Diego flights
Edinburgh to Los Angeles flights
Edinburgh to San Francisco flights
Manchester to San Jose flights
Birmingham to Los Angeles flights
Southampton to San Francisco flights
Edinburgh to Las Vegas flights
Manchester to Long Beach flights
Heathrow to Sacramento flights
Newcastle upon Tyne to Los Angeles flights
Edinburgh to Ontario flights
Gatwick to Ontario flights

Top 6 airlines flying from London to Ontario

Discover the top 6 airlines that operate flights from London to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 5 December 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£281Average£498FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Virgin AtlanticCheapest£377Average£500FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£388Average£476FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£388Average£563FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£397Average£602FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£434Average£583FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from London to Ontario?

When you search for this flight from London to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from London to Ontario?

Cheapflights helps you find that perfect flight to Ontario from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from London to Ontario with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from London to Ontario, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from London to Ontario become cheaper?

Yes, Cheapflights offers price alerts on London to Ontario flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.