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Cheap flights from Ontario (ONT) to the United Kingdom from $318

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 9/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — LHR
May 21 — May 281
From?
To?
Tue 5/21
Tue 5/28
1 adult, Economy
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How far in advance should I book a flight from Ontario to United Kingdom?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 15 days in advance, which can save you up to 31% on flights from Ontario to United Kingdom compared to booking the week you need them. Waiting 15 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 $758. For sooner than that we have options available in the next 3 days from $1,025.

What is the cheapest month to fly from Ontario to United Kingdom?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, October can be a great choice for travel to United Kingdom. Flights to United Kingdom from Ontario in October are about $715 on average during October, but can be found for as low as $429.

When is the cheapest time to fly from Ontario to United Kingdom (ONT - GB)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to United Kingdom as you normally would.

Cheap Delta flights from Ontario to United Kingdom

Explore cheap flight options specifically provided by Delta for the route between Ontario and United Kingdom. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Find some of the cheapest Delta flights traveling from Ontario to United Kingdom. Make sure to double check the flight details before booking.
Tue 10/291:42 pmONT - LHR
1 stop13h 18mDelta
Fri 11/86:20 amLHR - ONT
2 stops19h 43mDelta
Deal found 5/16$622
Tue 11/57:00 amONT - LHR
1 stop17h 45mDelta
Tue 11/266:30 amLHR - ONT
2 stops20h 52mDelta
Deal found 5/15$625
Tue 10/296:00 amONT - LHR
2 stops18h 05mDelta
Fri 11/86:20 amLHR - ONT
2 stops19h 43mDelta
Deal found 5/15$626
Tue 10/297:00 amONT - LHR
2 stops20h 30mDelta
Fri 11/86:20 amLHR - ONT
2 stops19h 43mDelta
Deal found 5/16$627
Mon 9/2312:45 pmONT - EDI
1 stop14h 50mDelta
Wed 10/210:35 amEDI - ONT
2 stops19h 53mDelta
Deal found 5/15$663
Sun 9/227:00 amONT - EDI
1 stop20h 35mDelta
Fri 10/412:05 pmEDI - ONT
1 stop31h 17mDelta
Deal found 5/15$664
Wed 10/212:45 pmONT - EDI
1 stop14h 50mDelta
Wed 10/91:35 pmEDI - ONT
2 stops18h 16mDelta
Deal found 5/15$687
Thu 9/197:00 amONT - LGW
2 stops19h 00mDelta
Mon 9/3012:00 pmLGW - ONT
2 stops18h 28mDelta
Deal found 5/16$698
Wed 9/2512:45 pmONT - EDI
1 stop14h 50mDelta
Wed 10/210:35 amEDI - ONT
2 stops19h 53mDelta
Deal found 5/15$713

Cheap American Airlines flights from Ontario to United Kingdom

Explore cheap flight options specifically provided by American Airlines for the route between Ontario and United Kingdom. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Have a look at some of the cheapest available American Airlines flights departing from Ontario and landing in United Kingdom. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
Tue 10/2910:56 amONT - LHR
1 stop15h 49mAmerican Airlines
Fri 11/811:50 amLHR - ONT
1 stop16h 23mAmerican Airlines
Deal found 5/15$628
Thu 9/1912:45 pmONT - LHR
1 stop13h 55mAmerican Airlines
Mon 9/309:15 amLHR - ONT
1 stop20h 45mAmerican Airlines
Deal found 5/15$728
Thu 9/1911:00 pmONT - LHR
2 stops14h 40mAmerican Airlines
Mon 9/301:40 pmLHR - ONT
2 stops16h 04mAmerican Airlines
Deal found 5/15$732
Sun 6/912:49 pmONT - LHR
1 stop13h 56mAmerican Airlines
Sun 6/163:15 pmLHR - ONT
1 stop15h 44mAmerican Airlines
Deal found 5/15$823
Fri 6/1410:54 amONT - LHR
1 stop13h 06mAmerican Airlines
Fri 6/2110:10 amLHR - ONT
2 stops16h 27mAmerican Airlines
Deal found 5/15$964
Tue 5/2112:53 pmONT - LHR
1 stop14h 12mAmerican Airlines
Wed 5/291:05 pmLHR - ONT
1 stop15h 03mAmerican Airlines
Deal found 5/16$971
Tue 5/216:00 amONT - LGW
2 stops18h 35mAmerican Airlines
Fri 10/2510:05 amLGW - ONT
2 stops19h 39mAmerican Airlines
Deal found 5/14$994
Fri 5/2410:29 pmONT - LGW
2 stops49h 41mAmerican Airlines
Thu 6/612:20 pmLGW - ONT
2 stops19h 39mAmerican Airlines
Deal found 5/16$1,070
Fri 5/247:31 amONT - LHR
1 stop14h 54mAmerican Airlines
Wed 5/296:45 amLHR - ONT
2 stops19h 37mAmerican Airlines
Deal found 5/15$1,122

Cheap Ontario to United Kingdom flights in May & June 2024

Find cheap flight options from Ontario to United Kingdom specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Prices were last updated on May 16, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to United Kingdom in 2024. Check back in a little while for more flight options.
Mon 6/246:00 amONT - LHR
1 stop17h 40mUnited Airlines
Fri 8/234:15 pmLHR - ONT
1 stop16h 30mUnited Airlines
Deal found 5/15$702
Wed 6/51:55 pmONT - LHR
1 stop16h 15mUnited Airlines
Fri 6/1410:35 amLHR - ONT
1 stop18h 39mUnited Airlines
Deal found 5/15$709
Mon 6/36:25 pmONT - LHR
2 stops28h 05mAir Canada
Tue 6/189:30 amLHR - ONT
2 stops39h 58mAir Canada
Deal found 5/15$714
Mon 6/246:25 pmONT - LHR
2 stops28h 05mAir Canada
Fri 8/239:30 amLHR - ONT
2 stops35h 02mAir Canada
Deal found 5/15$724
Tue 6/116:25 pmONT - LHR
2 stops28h 10mAir Canada
Tue 6/182:05 pmLHR - ONT
2 stops35h 23mAir Canada
Deal found 5/15$727
Sun 5/1910:29 pmONT - LGW
2 stops24h 06mAmerican Airlines
Wed 6/1210:40 amLGW - ONT
2 stops20h 19mAmerican Airlines
Deal found 5/15$742
Sun 5/1910:29 pmONT - LGW
2 stops24h 06mAmerican Airlines
Wed 6/1210:40 amLGW - ONT
2 stops20h 19mAmerican Airlines
Deal found 5/16$745
Sun 6/912:49 pmONT - LHR
1 stop15h 56mIberia
Tue 6/1811:30 amLHR - ONT
2 stops20h 29mIberia
Deal found 5/15$757
Tue 5/216:00 amONT - LHR
1 stop24h 10mUnited Airlines
Tue 5/2812:05 pmLHR - ONT
2 stops32h 40mUnited Airlines
Deal found 5/15$759

Ontario to United Kingdom 2024 flight deals

Discover exclusive flight deals for travel between Ontario and United Kingdom in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to United Kingdom in 2024. Check back in a little while for more flight options.
Tue 10/291:42 pmONT - LHR
1 stop13h 18mDelta
Fri 11/86:20 amLHR - ONT
2 stops19h 43mDelta
Deal found 5/16$622
Tue 11/57:00 amONT - LHR
1 stop16h 15mDelta
Tue 11/266:30 amLHR - ONT
2 stops20h 52mDelta
Deal found 5/16$625
Tue 10/296:00 amONT - LHR
2 stops18h 05mDelta
Fri 11/86:20 amLHR - ONT
2 stops19h 43mDelta
Deal found 5/15$626
Tue 10/297:00 amONT - LHR
2 stops20h 30mDelta
Fri 11/86:20 amLHR - ONT
2 stops19h 43mDelta
Deal found 5/16$627
Tue 10/2910:56 amONT - LHR
1 stop15h 49mAmerican Airlines
Fri 11/811:50 amLHR - ONT
1 stop16h 23mAmerican Airlines
Deal found 5/15$628
Mon 9/301:30 pmONT - LHR
1 stop14h 50mUnited Airlines
Tue 10/811:05 amLHR - ONT
1 stop14h 12mUnited Airlines
Deal found 5/15$629
Tue 11/56:00 amONT - LHR
2 stops17h 05mDelta
Tue 11/266:30 amLHR - ONT
2 stops20h 52mDelta
Deal found 5/16$630
Wed 10/231:30 pmONT - LHR
1 stop14h 50mUnited Airlines
Tue 10/2910:05 amLHR - ONT
1 stop14h 35mUnited Airlines
Deal found 5/15$639
Sun 9/11:35 pmONT - LHR
1 stop14h 45mUnited Airlines
Thu 9/122:50 pmLHR - ONT
1 stop14h 12mUnited Airlines
Deal found 5/15$662

Ontario to United Kingdom flights leaving soon

Find last-minute flight options from Ontario to United Kingdom for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Have a look at some of the flights available from Ontario to United Kingdom departing last-minute. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.
Tue 5/216:00 amONT - LHR
1 stop24h 10mUnited Airlines
Tue 5/2812:05 pmLHR - ONT
2 stops32h 40mUnited Airlines
Deal found 5/16$759
Tue 5/211:36 pmONT - LHR
1 stop12h 04mUnited Airlines
Wed 5/294:15 pmLHR - ONT
1 stop14h 14mUnited Airlines
Deal found 5/14$767
Tue 5/211:36 pmONT - LHR
1 stop12h 04mUnited Airlines
Wed 5/2911:05 amLHR - ONT
1 stop14h 23mUnited Airlines
Deal found 5/16$769
Tue 5/211:36 pmONT - LHR
1 stop14h 44mUnited Airlines
Tue 5/284:15 pmLHR - ONT
1 stop14h 14mUnited Airlines
Deal found 5/15$774
Tue 5/2110:42 amONT - LHR
1 stop15h 43mUnited Airlines
Sat 6/12:50 pmLHR - ONT
1 stop13h 48mUnited Airlines
Deal found 5/15$824
Tue 5/211:36 pmONT - LHR
1 stop12h 04mUnited Airlines
Fri 10/2510:25 amLHR - ONT
1 stop15h 18mUnited Airlines
Deal found 5/15$830
Tue 5/211:36 pmONT - LHR
1 stop12h 04mUnited Airlines
Fri 10/252:50 pmLHR - ONT
1 stop13h 42mUnited Airlines
Deal found 5/15$833
Wed 5/226:00 amONT - LHR
1 stop24h 10mUnited Airlines
Wed 5/298:30 amLHR - ONT
2 stops36h 15mUnited Airlines
Deal found 5/15$894
Tue 5/212:50 pmONT - LHR
1 stop13h 25mIberia
Wed 5/294:25 pmLHR - ONT
1 stop15h 31mIberia
Deal found 5/15$899

One-way flights to United Kingdom from Ontario

Search for one-way flight options from Ontario to United Kingdom. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Take a look at some of the one-way flights we've detected from Ontario to United Kingdom. Those needing a return flight from Ontario to United Kingdom can use the search form above.
Thu 9/56:57 amONT - LGW
2 stops22h 33mMultiple Airlines
Deal found 5/16$318
Sun 7/149:34 amONT - LGW
2 stops19h 56mMultiple Airlines
Deal found 5/15$330
Thu 6/1312:59 amONT - LGW
2 stops45h 21mMultiple Airlines
Deal found 5/15$431
Sat 6/13:35 pmONT - LGW
3 stops56h 00mMultiple Airlines
Deal found 5/15$453
Sun 10/66:15 amONT - LHR
2 stops17h 25mUnited Airlines
Deal found 5/15$455
Tue 10/111:36 pmONT - LHR
1 stop13h 09mJetBlue
Deal found 5/15$457
Sun 9/2910:59 pmONT - LGW
2 stops27h 01mDelta
Deal found 5/15$457
Tue 11/56:35 pmONT - LGW
2 stops31h 10mMultiple Airlines
Deal found 5/15$465
Sat 11/96:35 pmONT - LHR
1 stop28h 50mUnited Airlines
Deal found 5/15$469

Find flights from Ontario to United Kingdom within your budget

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 2,637,452 searches. Data last updated May 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$622 - $775

Route

Depart

Return

Price

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 10/29

1 stop13h 18m

London Heathrow

Fri 11/8

2 stops19h 43m

$622

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 10/29

1 stop15h 49m

London Heathrow

Fri 11/8

1 stop16h 23m

$628

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Mon 9/30

1 stop14h 50m

London Heathrow

Tue 10/8

1 stop14h 12m

$629

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Thu 10/10

1 stop14h 25m

London Heathrow

Fri 10/18

1 stop16h 33m

$679

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Mon 8/12

2 stops36h 30m

London Heathrow

Tue 8/27

2 stops35h 02m

$682

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Thu 9/19

1 stop15h 50m

London Heathrow

Mon 9/30

2 stops36h 11m

$688

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 9/3

1 stop13h 14m

London Heathrow

Fri 9/13

1 stop15h 01m

$702

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 9/25

1 stop13h 09m

London Heathrow

Tue 10/1

1 stop18h 26m

$744

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 9/11

2 stops18h 20m

London Heathrow

Tue 9/24

2 stops21h 01m

$775

Flights are sorted by cheapest first

Deals found on 5/16

No data available for this route at this time. Please check back soon.

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 May 16, 2024.
Get a feel of what it's like to fly with Delta, American Airlines and United Airlines from Ontario to United Kingdom by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Delta
8.0
Very good
10,673 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

KLM
7.9
Good
1,568 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Virgin Atlantic
7.7
Good
735 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

JetBlue
7.6
Good
4,472 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Air France
7.6
Good
1,764 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

Entertainment

8.0

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

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.

  • Can I find flights from Ontario to United Kingdom for under $700 on Cheapflights?

    Yes, there are multiple flights from Ontario to United Kingdom for under $700. The cheapest flight booked recently is on Delta for just $622, but on average you can expect to pay $661.

  • Are there last-minute flights available from Ontario to United Kingdom for under $800?

    There are currently 20+ open flights from Ontario to United Kingdom within the next 7 days for less than $800.

  • What are the cheapest airlines to fly from Ontario to United Kingdom one-way?

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $455. However, be on the lookout for offers from JetBlue and Delta, as they are both options that can get you from Ontario to United Kingdom for a low price.

  • 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.

  • What are the most popular airlines that fly from Ontario to United Kingdom?

    Before booking your flight from Ontario to United Kingdom check out the most popular airlines for this route: American Airlines, British Airways or Delta.

  • What does ONT to LHR mean?

    ONT and LHR are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. ONT to LHR refers to a flight route from Ontario Airport to London Heathrow Airport. Manchester Airport (MAN), Edinburgh Turnhouse Airport (EDI), London Gatwick Airport (LGW), Birmingham Airport (BHX), Glasgow Intl Airport (GLA) are other airports near this flight route and their unique identifiers/IATA codes.

  • Can I find deals for flights from Ontario to United Kingdom that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to United Kingdom flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ontario to United Kingdom with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to United Kingdom flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • 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.

  • Can I find deals for flights from Ontario to United Kingdom that allow pets onboard?

    Many airlines flying from Ontario to United Kingdom offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ontario to United Kingdom?

    Yes, you can often find last-minute deals on Ontario to United Kingdom flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ontario to United Kingdom flight deals updated?

    The Ontario to United Kingdom flight deals you see on this page were last updated on 5/16.

See more FAQs

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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 2,637,452 searches. Data last updated May 16, 2024.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$482Average$954FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest$591Average$667FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest$597Average$986FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest$598Average$912FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$620Average$671FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest$642Average$805FlexibilityNo cancel feeOn-time77%
Search Iberia flights
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Search flights from Ontario to United Kingdom by cabin class

Find flights from Ontario to United Kingdom, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to United Kingdom?

Cheapflights helps you search for flights from Ontario to United Kingdom via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Ontario to United Kingdom?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Ontario to United Kingdom.

Can Cheapflights find flights from Ontario to United Kingdom with no change fees?

Yes, we can. To see specific flights from Ontario to United Kingdom with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Ontario to United Kingdom become cheaper?

Yes, Cheapflights offers price alerts on Ontario to United Kingdom 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.

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