$237+ Cheap flights from Ontario (ONT) to London (LON)
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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Ontario to London with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.The best prices from Ontario to London are usually found in September or October, booked 73 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday
Cheap flight deals from Ontario to London
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to London (LON). 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 January 20, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $638 (Iberia) |
One-way from | $272 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $683 |
Find flight deals from Ontario to London
Cheapest flights from Ontario to LondonExplore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 20, 2025.
Explore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 20, 2025.
This Ticket deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Iberia deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Cheapflightsfares deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Iberia deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Air Canada deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Virgin Atlantic deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This The Travel House deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Air Canada deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This JetBlue deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Find flights from Ontario to London within your budget
Customize your flight search to find flights from Ontario to London 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 2,558,603 searches. Data last updated January 20, 2025.
Fly from
Fly to
Route
Depart
Return
Price
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 2/9
2:45 pm-12:05 pm
1 stop13h 20m
London Heathrow
Tue 2/18
1:50 pm-10:16 pm
1 stop16h 26m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Tue 2/4
3:04 pm-12:05 pm
1 stop13h 01m
London Heathrow
Tue 2/18
10:40 am-6:35 pm
1 stop15h 55m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Tue 3/4
1:05 pm-10:35 am
1 stop13h 30m
London Heathrow
Tue 3/11
6:30 am-4:42 pm
2 stops17h 12m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 2/2
6:15 am-10:10 am
2 stops19h 55m
London Heathrow
Tue 2/18
6:00 pm-8:52 pm
2 stops34h 52m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 2/2
6:15 am-7:25 am
1 stop17h 10m
London Heathrow
Tue 2/18
9:30 am-8:40 pm
2 stops19h 10m
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Wed 2/26
2:43 pm-10:35 am
1 stop35h 52m
London Gatwick
Mon 3/10
2:00 pm-5:59 pm
2 stops34h 59m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Fri 2/14
1:05 pm-1:10 pm
2 stops16h 05m
London Heathrow
Wed 2/19
6:20 am-10:32 pm
2 stops24h 12m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Fri 2/7
6:00 am-7:55 am
2 stops17h 55m
London Heathrow
Tue 4/15
11:30 am-10:40 pm
2 stops19h 10m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Wed 3/12
10:38 am-7:25 am
1 stop13h 47m
London Heathrow
Sun 3/16
1:45 pm-10:45 pm
1 stop16h 00m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Wed 5/7
5:05 am-6:35 am
2 stops17h 30m
London Heathrow
Wed 5/14
9:30 am-8:53 pm
2 stops19h 23m
Compare providers for flights from Ontario to London
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to London in January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-London flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to London
Have a flexible travel schedule? Discover the best time to fly to London from Ontario with our price prediction graph.
Travel insights for flights from Ontario to London
Get recent, data-driven insights about flights from Ontario to London including ideal travel times, pricing trends, and more.
How far ahead should I book a flight from Ontario to London?
Use this chart to determine the optimal time to book a round-trip flight from Ontario to London. Price data was last updated on January 17, 2025.
To ensure you get the cheapest price possible for a flight from Ontario to London, you should look to book at least 72 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 Ontario to London?
Currently, November is the cheapest month in which you can book a flight from Ontario to London (average of $661). Flying from Ontario to London in June is currently the most expensive (average of $1,137). 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 ONT to LON?
Find hourly flight availability from Ontario to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 20, 2025.
It’s optimal to fly from Ontario to London in the evening. By choosing this option you can save up to 24% on the cost of your flight, compared to a flight in the morning.
What is the cheapest day to fly from Ontario to London?
Use this chart to determine the cheapest time to fly round-trip from Ontario to London. Price data was last updated on December 16, 2024.
Travelers seeking maximum savings on their Ontario to London flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Rainfall in London by month
Plan your trip to London by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.
Temperature in London by month
Plan your trip to London by taking into account the average temperature totals by month.
If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).
Reviews of airlines servicing London
Get insights into the airlines that provide service to London. 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 London. Reviews last updated January 20, 2025.
Get a feel of what it's like to fly with Iberia, KLM and Delta from Ontario to London by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
Entertainment
Food
Boarding
Overall
Crew
Reviews
For the money it’s good value. Seat space rather small
Comfort
Entertainment
Food
Boarding
Overall
Crew
Reviews
For the money it’s good value. Seat space rather small
Comfort
Entertainment
Food
Boarding
Overall
Crew
Reviews
For the money it’s good value. Seat space rather small
Comfort
Entertainment
Food
Boarding
Overall
Crew
Reviews
For the money it’s good value. Seat space rather small
Comfort
Entertainment
Food
Boarding
Overall
Crew
Reviews
For the money it’s good value. Seat space rather small
Comfort
Entertainment
Food
Boarding
Overall
Crew
Reviews
For the money it’s good value. Seat space rather small
Related info for your journey
Find useful and relevant information for your journey from Ontario to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Ontario?
Book flights to Ontario if you plan to visit one of these locationsBrowse 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 Ontario to London
See prices for flight routes from nearby airports that may be better suited for you.
Top 7 airlines flying from Ontario to London
Discover the top 7 airlines that operate flights from Ontario to London. 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 2,558,603 searches. Data last updated January 20, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$455 | Average$727 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$481 | Average$767 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$481 | Average$706 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$582 | Average$803 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$609 | Average$846 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$619 | Average$780 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$629 | Average$863 | FlexibilityNo cancel fee | On-time70% |