Cheap flights from London to Los Angeles from $472
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Los Angeles departing on 9/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Iberia flights from London to Ontario
Our best Iberia deals on London to Ontario flight tickets
Delta flights from London to Ontario
Our best Delta deals on London to Ontario flight tickets
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How to get the cheapest flight ticket from London to Ontario
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 London and Ontario?
What is the cheapest month to fly to Ontario?
In general, February is the cheapest month to fly from London to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $546. If you aren’t able to travel during the month of February, then book flights to Ontario from London during January instead. Flights to Ontario in January, while not as cheap as those in February, still average around $557.
What is the cheapest day to depart on your flight to Ontario?
The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $602. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from London to Ontario for around $991.
What is the cheapest time of day to depart on your flight to Ontario?
In the afternoon is the cheapest time of day to fly from London to Ontario when you can find flight prices for as low as $602. Flying to Ontario in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $814 on average. Flights to Ontario from London at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.
How far in advance should I book a flight to Ontario?
You are more likely to see cheaper flights to Ontario from London when booking 26 weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $712 when searching 26 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from London for as low as $550 on momondo.
What is the cheapest airline that flies from London to Ontario?
British Airways, Iberia, and JetBlue are the most popular carriers operating from London to Ontario
What airlines fly to Ontario?
British Airways, American Airlines and Delta are the top three most popular airlines that fly to Ontario from London according to our data. British Airways is the first choice among our users, with 46% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 13 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.
When to book flights from London to Ontario
Cheap London to Ontario (LON to ONT) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London to Ontario
How far is London to Ontario by plane?
The distance between London and Ontario is about 5417.5 mi. Typically, this will take 13h 22m by plane in normal conditions.
When did momondo last update prices for flights from London to Ontario Airport?
Prices for flights from London to Ontario Airport are updated daily.
How many operators does momondo search for flights from London to Ontario Airport?
As of June 2025, there is 1 operator available to choose from for flights from London to Ontario Airport.
How old do you have to be to fly from London to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
Best airlines flying from London to Ontario
Compare and see reviews for airlines that fly from London to Ontario with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $560 | Free Cancellation | Rating 7.4 8,790 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from London 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 from London.
Can I find flights from London to Ontario with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for London to Ontario flights to just show those with flexible booking policies.
How can momondo help me find flights from London to Ontario?
momondo provides multiple filters to help you find the best flight to Ontario from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from London to Ontario right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of London to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.