Cheap flights from Ontario to London from $388
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to London departing on 8/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from Ontario to London
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Icelandair flights from Ontario to London
Our best Icelandair deals on Ontario to London flight tickets
Lufthansa flights from Ontario to London
Our best Lufthansa deals on Ontario to London flight tickets
See travel insights to London from
How to get the cheapest flight ticket from Ontario to London
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Ontario and London?
What is the cheapest month to fly to London?
The cheapest month to fly to London from Ontario is in October. Flight prices, which tend to average around $668, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from Ontario averaging around $683.
What is the cheapest day to depart on your flight to London?
The cheapest day to depart from Ontario to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $802. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $930. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.
What is the cheapest time of day to depart on your flight to London?
Flying to London from Ontario in the morning is the least expensive time of day to depart. momondo users have found prices as low as $755 when looking at flights departing in the morning. Flights to London are more costly at noon, with an average ticket price of $900. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.
How far in advance should I book a flight to London?
You are more likely to see cheaper flights to London from Ontario when booking 16 weeks ahead of your departure date. In general, you can expect to find flights to London for around $828 when searching 16 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Ontario for as low as $731 on momondo.
What is the cheapest airline that flies from Ontario to London?
Virgin Atlantic, JetBlue, and United Airlines are the most popular carriers operating from Ontario to London
What airlines fly to London?
British Airways, Iberia and American Airlines are the top three most popular airlines that fly to London from Ontario according to our data. British Airways is the first choice among our users, with 43% of people opting to fly with this airline when traveling to London. Keep in mind that there are 21 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.
When to book flights from Ontario to London
Cheap Ontario to London (ONT to LON) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Ontario to London
How far is Ontario to London by plane?
The straight-line distance from Ontario to London is 5417.5 mi. A reasonable flight in good conditions will take 12h 05m.
When did momondo last update prices for flights from Ontario Airport to London?
Prices for flights from Ontario Airport to London are updated daily.
How many operators does momondo search for flights from Ontario Airport to London?
As of April 2025, there are 6 operators available to choose from for flights from Ontario Airport to London.
How old do you have to be to fly from Ontario Airport to London?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to London.
What documentation or ID do you need to fly to London?
The necessary travel and health documents for your London trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Ontario to London?
momondo data reveals that the most frequently booked airline on the route from Ontario to London is American Airlines, representing 25% of all bookings. The subsequent popular airlines are United Airlines at 23%, British Airways at 17%, and Delta at 15%.
Best airlines flying from Ontario to London
Compare and see reviews for airlines that fly from Ontario to London with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $454 | Free Cancellation | Rating 7.4 642 reviews | |||
| PriceFrom $582 | Free Cancellation | Rating 7.0 2,684 reviews | |||
| PriceFrom $598 | Free Cancellation | Rating 8.0 7,920 reviews | |||
| PriceFrom $629 | Free Cancellation | Rating 6.6 6,805 reviews | |||
| PriceFrom $629 | Free Cancellation | Rating 7.4 8,685 reviews | |||
| PriceFrom $629 | Free Cancellation | Rating 7.2 10,000 reviews |
Traveling to a place near London?
Book flights to London if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Ontario to London?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to London. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Ontario to London with flexible booking policies on momondo?
All flight searches from Ontario to London on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from Ontario to London?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to London.
I’m not ready to book a flight from Ontario to London right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Ontario to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.