Question 1

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

Accepted Answer

Flights via Seattle (SEA) offer the fastest connection on this route, with an average stopover time of 1h 19m.

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

Lisbon (LIS) is the most affordable one-stop option, with an average return flight price of £391.

Question 4

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

Accepted Answer

Dallas (DFW) – chosen by Cheapflights users on 24% of one-stop itineraries from London to Ontario on Cheapflights.

Question 5

How long is the flight from London to Ontario?

Accepted Answer

Airlines like British Airways, Virgin Atlantic, and American Airlines fly from London to Ontario in about 15h 02m. The time it takes to get you to your destination can typically vary by up to 20h 24m. 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.

Question 6

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

Accepted Answer

According to our current data, Finnair (£278), British Airways (£385), and KLM (£393) offers the cheapest pricing from London to Ontario. You may be able to fly from London to Ontario for 48% less than the average price by searching for these airlines.

Question 7

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

Accepted Answer

To ensure you get the cheapest price possible for a flight from London to Ontario, you should look to book at least 76 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.

Question 8

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

Accepted Answer

Currently, March is the cheapest month in which you can book a flight from London to Ontario (average of £516). Flying from London to Ontario in August is currently the most expensive (average of £827). 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.

Question 9

What is the cheapest day to fly from London to Ontario?

Accepted Answer

Travellers seeking maximum savings on their London to Ontario flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

Question 10

E

Accepted Answer

In terms of precipitation, rainfall in Ontario ranges from 3.0 - 86.0 inches per month. February is typically the wettest month, when rainfall can reach 86.0 mm. June is typically the driest time to visit Ontario when rainfall is around 3.0 mm.

Question 11

E

Accepted Answer

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 26.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 12.0 C).

Question 12

What are the most popular routes from London to Ontario?

Accepted Answer

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

Question 13

What are the most popular airlines that fly from London to Ontario?

Accepted Answer

When booking a flight from London to Ontario, you may want to consider flying on Finnair, British Airways or KLM as they are the most popular for this route.

Question 14

What is the cheapest day to fly round-trip from London to Ontario?

Accepted Answer

Departing on a Tuesday is a good option for securing a great price. You can expect to save up to 15% when planning your travel around this day of the week.

Question 15

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

Accepted Answer

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 56 days in advance, which can save you up to 38% on flights from London to Ontario compared to booking the week you need them. Waiting 56 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at £431. For sooner than that we have options available in the next 3 days from £685.

Question 16

What is the cheapest month to fly from London to Ontario?

Accepted Answer

Flights from London to Ontario lean towards being more expensive in December. Prices are generally better when you fly from London to Ontario in September, with the cheapest ticket starting at £307.

Question 17

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

Accepted Answer

It’s optimal to fly from London to Ontario in the evening. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight at midday.

Question 18

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

Accepted Answer

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.

Question 19

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

Accepted Answer

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

Question 20

How can I find direct flights from London to Ontario?

Accepted Answer

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

Question 21

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

Accepted Answer

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.

Question 22

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

Accepted Answer

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.

Question 23

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

Accepted Answer

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!

Question 24

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

Accepted Answer

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.

Question 25

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

Accepted Answer

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.

Round-trip from	£380
One-way from	£299
Popular in	July
Cheapest in	February
Average price	£651

Airline	Cheapest	Average	Flexibility	On-time
Finnair	Cheapest£278	Average£428	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
British Airways	Cheapest£385	Average£467	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£393	Average£596	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£394	Average£640	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Virgin Atlantic	Cheapest£405	Average£508	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Lufthansa	Cheapest£430	Average£575	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights

Cheap flights from London to Ontario from £299

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 15/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from London to Ontario are usually found in February or January, booked 77 days in advance, depart on a Wednesday or Tuesday and return on a Monday

Cheap flight deals from London to Ontario

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from London to Ontario

Cheapest flights from London to OntarioExplore 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 28 August 2025.

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 28 August 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to Ontario that are best for you.

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.

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 22 August 2025.

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

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 28 August 2025.

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.

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.

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.

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.

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from London to Ontario, such as Finnair, United Airlines, andVirgin Atlantic. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

How long is the flight from London to Ontario?

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

What are the most popular routes from London to Ontario?

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

How can I find direct flights from London to Ontario?

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

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

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.

Top 6 airlines flying from London to Ontario

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?

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

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

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

100% Free

Book with Flexibility

Travel Smart

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 28 August 2025.