HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
United Kingdom

$210+ Cheap flights from Ontario (ONT) to the United Kingdom

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 7/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
févr. 28 — mars 71
sam. 2/28
sam. 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to United Kingdom 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.

Cheap flight deals from Ontario to United Kingdom

Cheapest flights from Ontario to United Kingdom
Explore the most affordable flight options available from Ontario to United Kingdom. Find the lowest fares from popular airlines and budget airlines, with prices last updated on janvier 29, 2026.

This oojo deal was found by Cheapflights users on 1/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 2/265:02 pm
ONT
-
EDI
2 stops15h 33m
British Airways
jeu. 3/59:25 am
EDI
-
ONT
2 stops21h 04m
British Airways
Deal found 1/27$614
This oojo deal was found by Cheapflights users on 1/26. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/245:02 pm
ONT
-
MAN
2 stops15h 28m
British Airways
lun. 3/29:40 am
MAN
-
ONT
2 stops21h 09m
British Airways
Deal found 1/26$617
This oojo deal was found by Cheapflights users on 1/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/55:02 pm
ONT
-
EDI
2 stops18h 38m
British Airways
mar. 4/146:05 pm
EDI
-
ONT
2 stops32h 32m
British Airways
Deal found 1/27$620
This oojo deal was found by Cheapflights users on 1/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 2/285:02 pm
ONT
-
MAN
2 stops18h 03m
British Airways
sam. 3/79:50 am
MAN
-
ONT
2 stops20h 59m
British Airways
Deal found 1/29$621
This oojo deal was found by Cheapflights users on 1/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/42:08 pm
ONT
-
EDI
2 stops18h 27m
British Airways
jeu. 5/1412:40 pm
EDI
-
ONT
2 stops17h 19m
British Airways
Deal found 1/27$630
This Virgin Atlantic deal was found by Cheapflights users on 1/26. 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.
lun. 2/237:30 am
ONT
-
LHR
1 stop20h 25m
Virgin Atlantic
lun. 3/28:25 pm
LHR
-
ONT
2 stops27h 37m
Virgin Atlantic
Deal found 1/26$631
This Delta deal was found by Cheapflights users on 1/28. 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.
jeu. 2/267:30 am
ONT
-
LHR
1 stop19h 00m
Delta
jeu. 3/58:40 am
LHR
-
ONT
2 stops20h 25m
Delta
Deal found 1/28$634
This oojo deal was found by Cheapflights users on 1/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/32:39 pm
ONT
-
MAN
2 stops17h 51m
British Airways
mar. 3/319:35 pm
MAN
-
ONT
2 stops29h 07m
British Airways
Deal found 1/27$635
This oojo deal was found by Cheapflights users on 1/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/1912:19 pm
ONT
-
MAN
2 stops25h 11m
British Airways
mer. 4/299:20 am
MAN
-
ONT
2 stops22h 26m
British Airways
Deal found 1/27$636
This Delta deal was found by Cheapflights users on 1/28. 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.
mer. 3/43:30 pm
ONT
-
LHR
2 stops20h 40m
Delta
mer. 3/116:30 am
LHR
-
ONT
2 stops17h 42m
Delta
Deal found 1/28$639
This Delta deal was found by Cheapflights users on 1/27. 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.
mar. 2/246:00 am
ONT
-
BHX
2 stops27h 50m
Delta
mar. 3/39:20 am
BHX
-
ONT
2 stops19h 45m
Delta
Deal found 1/27$639
This United Airlines deal was found by Cheapflights users on 1/28. 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.
mer. 3/41:50 pm
ONT
-
LHR
1 stop14h 10m
United Airlines
mer. 3/116:30 am
LHR
-
ONT
2 stops18h 11m
United Airlines
Deal found 1/28$644

Find flight deals from Ontario to United Kingdom

Keep the following information in mind while searching for Ontario to United Kingdom flight deals. Data was last updated janvier 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$614
(oojo)

One-way from

$210
(oojo)

Popular in

December

Cheapest in

September

Average price

$738
Provider with most accurate pricing for Los Angeles-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-London (LON) flights.
Search Deals
From Ontario to United Kingdom
Search Deals
One-way flight from Ontario to United Kingdom
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($113 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($29 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to United Kingdom 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 janvier 29, 2026.
Use the filters below to find and compare flights from Ontario to the United Kingdom that are best for you.

Fly from

Ontario

Fly to

United Kingdom

Route

Depart

Return

Price

OntarioManchester

ONT - MAN

ONTMAN

Ontario

mar. 2/24

5:02 pm-6:45 pm

2 stops17h 43m

Manchester

dim. 3/1

9:40 am-10:07 pm

2 stops20h 27m

$617

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

dim. 4/5

5:02 pm-7:40 pm

2 stops18h 38m

Edinburgh Turnhouse

mar. 4/14

6:05 pm-6:37 pm

2 stops32h 32m

$620

OntarioManchester

ONT - MAN

ONTMAN

Ontario

sam. 2/28

5:02 pm-7:05 pm

2 stops18h 03m

Manchester

sam. 3/7

9:50 am-10:49 pm

2 stops20h 59m

$621

OntarioManchester

ONT - MAN

ONTMAN

Ontario

mar. 3/3

2:39 pm-4:30 pm

2 stops17h 51m

Manchester

mar. 3/31

9:35 pm-6:42 pm

2 stops29h 07m

$635

OntarioLondon

ONT - LHR

ONTLHR

Ontario

mer. 3/4

3:30 pm-8:10 pm

2 stops20h 40m

London Heathrow

mer. 3/11

6:30 am-5:12 pm

2 stops17h 42m

$639

OntarioBirmingham

ONT - BHX

ONTBHX

Ontario

mar. 2/24

6:00 am-5:50 pm

2 stops27h 50m

Birmingham

mar. 3/3

9:20 am-9:05 pm

2 stops19h 45m

$639

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

mer. 4/8

7:00 am-8:05 am

2 stops17h 05m

Edinburgh Turnhouse

mar. 4/28

12:30 pm-12:14 pm

2 stops31h 44m

$645

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

mer. 4/8

7:00 am-8:05 am

2 stops17h 05m

Edinburgh Turnhouse

mer. 4/29

12:30 pm-12:22 pm

2 stops31h 52m

$645

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

lun. 3/30

7:00 am-10:35 am

2 stops19h 35m

Edinburgh Turnhouse

ven. 4/10

9:00 am-9:50 pm

2 stops20h 50m

$654

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

mar. 4/7

12:19 pm-7:30 pm

2 stops23h 11m

Edinburgh Turnhouse

mer. 4/15

9:15 pm-4:22 pm

2 stops27h 07m

$656

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Ontario to United Kingdom

Have a flexible travel schedule? Discover the best time to fly to United Kingdom from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to the United Kingdom

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

Currently, October is the cheapest month in which you can book a flight from Ontario to United Kingdom (average of $222). Flying from Ontario to United Kingdom in June is currently the most expensive (average of $569). 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.

Reviews of airlines servicing United Kingdom

Get insights into the airlines that provide service to United Kingdom. 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 United Kingdom. Reviews last updated janvier 29, 2026.
Read through reviews of airlines operating flights from Ontario to the United Kingdom, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,127 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.9
Good
8,127 reviews
Delta
7.9
Good
8,127 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
9,215 reviews
Delta
7.9
Good
8,127 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
11,206 reviews
Delta
7.9
Good
8,127 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Iberia
7.0
Good
3,100 reviews
Delta
7.9
Good
8,127 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
British Airways
6.7
Okay
7,705 reviews
Delta
7.9
Good
8,127 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Ontario to United Kingdom. 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 from for flights from Ontario to United Kingdom?

    If you book a flight to United Kingdom from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • How long is the flight from Ontario to United Kingdom?

    Airlines like British Airways, Delta, and United Airlines fly from Ontario to United Kingdom in about 17h 05m. The time it takes to get you to your destination can typically vary by up to 3h 35m. Airlines will cover a distance of 5118 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the most popular routes from Ontario to United Kingdom?

    Most travelers choose Ontario - London Heathrow, Ontario - Edinburgh Turnhouse or Ontario - London Gatwick when deciding on the best route from Ontario to United Kingdom.

  • Can I find deals for flights from Ontario to United Kingdom that include hotel bookings?

    Yes. In addition to deals on Ontario to United Kingdom flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to United Kingdom?

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

  • Can I find deals for business class flights from Ontario to United Kingdom?

    Yes. Cheapflights offers flight deals from Ontario to United Kingdom by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to United Kingdom?

    Currently, October is the cheapest month in which you can book a flight from Ontario to United Kingdom (average of $222). Flying from Ontario to United Kingdom in June is currently the most expensive (average of $569). 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.

See more FAQs

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 Ontario to United Kingdom

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Heathrow flights
San Francisco to Heathrow flights
Los Angeles to Charles de Gaulle flights
San Francisco to Charles de Gaulle flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
San Francisco to Leonardo da Vinci/Fiumicino flights
Los Angeles to Istanbul flights
Los Angeles to Madrid flights
Los Angeles to Gatwick flights
San Francisco to Gatwick flights
San Francisco to Barcelona-El Prat flights
Los Angeles to Stansted flights
Los Angeles to Barcelona-El Prat flights
Los Angeles to London City flights
San Francisco to Istanbul flights
Los Angeles to Orly flights
Los Angeles to Dublin flights
Los Angeles to Amsterdam flights
San Francisco to Dublin flights
San Francisco to London City flights
San Francisco to Lisbon flights
Los Angeles to Frankfurt flights
San Francisco to Stansted flights
Los Angeles to Athens flights
San Francisco to Amsterdam flights
San Francisco to Frankfurt flights
San Francisco to Madrid flights
San Francisco to Zurich flights
San Francisco to Athens flights
San Diego to Heathrow flights
San Francisco to Orly flights
Ontario to Heathrow flights
Ontario to Charles de Gaulle flights
Los Angeles to Zurich flights
Los Angeles to Copenhagen flights
San Francisco to Malpensa flights
Los Angeles to Malpensa flights
Ontario to Leonardo da Vinci/Fiumicino flights
San Francisco to Linate flights
Santa Ana to Charles de Gaulle flights
Las Vegas to Heathrow flights
Los Angeles to Luton flights
Santa Ana to Leonardo da Vinci/Fiumicino flights
Los Angeles to Lisbon flights
San Francisco to Munich flights
Los Angeles to Sabiha Gokcen flights
San Francisco to Copenhagen flights
Los Angeles to Linate flights
Los Angeles to Frederic Chopin flights
Burbank to Charles de Gaulle flights

Top 6 airlines flying from Ontario to United Kingdom

Discover the top 6 airlines that operate flights from Ontario to United Kingdom. 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 janvier 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$543Average$929FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$567Average$712FlexibilityNo cancel feeOn-time71%
KLMCheapest$580Average$653FlexibilityNo cancel feeOn-time75%
IberiaCheapest$615Average$728FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$624Average$828FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$662Average$865FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.