Question 1

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

Accepted Answer

According to our current data, KLM (£392), Virgin Atlantic (£416), and Finnair (£419) offers the cheapest pricing from London to Ontario. You may be able to fly from London to Ontario for 27% less than the average price by searching for these airlines.

Question 2

What are the cheapest airlines to fly from London to Ontario one-way?

Accepted Answer

To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at £435. WestJet flights start at £488 while deals on Iberia start at £489 one-way.

Question 3

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 77 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 4

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 5

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 6

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 7

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 8

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 9

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 10

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 11

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 8 days in advance, which can save you up to 32% on flights from London to Ontario compared to booking the week you need them. Waiting 8 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 £427. For sooner than that we have options available in the next 3 days from £677.

Question 12

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

Accepted Answer

Flights from London to Ontario lean towards being more expensive in August. Prices are generally better when you fly from London to Ontario in February, with the cheapest ticket starting at £342.

Question 13

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 14

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 15

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 16

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 17

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 18

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 19

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 20

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 21

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	£392
Popular in	August
Cheapest in	February
Average price	£764

Airline	Cheapest	Average	Flexibility	On-time
Finnair	Cheapest£275	Average£423	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
British Airways	Cheapest£373	Average£480	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£373	Average£587	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£390	Average£581	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Virgin Atlantic	Cheapest£401	Average£505	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Lufthansa	Cheapest£425	Average£547	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights

Cheap flights from London to Ontario from £392

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/8. 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

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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 8 July 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 8 July 2025.

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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 27 June 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 8 July 2025.

How much does it cost for a return flight from London to Ontario?

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 8 July 2025.

Read through reviews of airlines operating flights from London to Ontario, such as Delta, KLM, andFinnair. 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?

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

What are the cheapest airlines to fly from London to Ontario one-way?

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

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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

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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?

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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 8 July 2025.