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Cheap flights from Ontario (ONT) to the United Kingdom from $397

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 6/30. 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 11 — May 181
From?
To?
Sat 5/11
Sat 5/18
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 40% 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 $755. For sooner than that we have options available in the next 3 days from $1,026.

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 United Airlines flights from Ontario to United Kingdom

Explore cheap flight options specifically provided by United 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 2,689,106 searches. Data last updated May 6, 2024.
Find some of the cheapest United Airlines flights traveling from Ontario to United Kingdom. Make sure to double check the flight details before booking.
Fri 8/21:45 pmONT - LHR
1 stop12h 40mUnited Airlines
Thu 8/292:50 pmLHR - ONT
1 stop14h 12mUnited Airlines
Deal found 5/6$749
Tue 5/141:36 pmONT - LHR
1 stop12h 04mUnited Airlines
Fri 6/144:15 pmLHR - ONT
1 stop14h 12mUnited Airlines
Deal found 5/6$767
Mon 7/81:45 pmONT - LHR
1 stop12h 40mUnited Airlines
Sun 3/29:20 amLHR - ONT
1 stop16h 40mUnited Airlines
Deal found 5/6$772
Sat 5/1810:42 amONT - LHR
2 stops35h 13mUnited Airlines
Tue 5/288:00 amLHR - ONT
2 stops20h 48mUnited Airlines
Deal found 5/5$778
Tue 5/2110:42 amONT - EDI
2 stops15h 53mUnited Airlines
Wed 5/299:40 amEDI - ONT
2 stops19h 34mUnited Airlines
Deal found 5/6$801
Thu 5/161:36 pmONT - LHR
1 stop14h 44mUnited Airlines
Wed 5/2911:05 amLHR - ONT
1 stop14h 23mUnited Airlines
Deal found 5/6$815
Thu 5/1610:42 amONT - LHR
1 stop15h 43mUnited Airlines
Thu 5/302:50 pmLHR - ONT
1 stop13h 58mUnited Airlines
Deal found 5/6$817
Thu 5/161:36 pmONT - LHR
1 stop14h 44mUnited Airlines
Wed 5/292:50 pmLHR - ONT
1 stop13h 58mUnited Airlines
Deal found 5/6$819
Sat 8/31:45 pmONT - LHR
2 stops14h 35mUnited Airlines
Sun 9/11:40 pmLHR - ONT
1 stop15h 51mUnited Airlines
Deal found 5/5$822

Cheap KLM flights from Ontario to United Kingdom

Explore cheap flight options specifically provided by KLM 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 2,689,106 searches. Data last updated May 6, 2024.
Have a look at some of the cheapest available KLM 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.
Wed 5/151:20 pmONT - LHR
1 stop12h 40mKLM
Wed 5/2911:00 amLHR - ONT
1 stop13h 36mKLM
Deal found 5/6$774
Fri 5/171:20 pmONT - LHR
1 stop12h 40mKLM
Thu 5/3010:55 amLHR - ONT
1 stop13h 41mKLM
Deal found 5/5$828
Wed 5/151:20 pmONT - LHR
1 stop12h 40mKLM
Wed 5/2211:00 amLHR - ONT
1 stop13h 36mKLM
Deal found 5/6$857
Wed 5/151:20 pmONT - LHR
1 stop12h 40mKLM
Thu 8/1510:55 amLHR - ONT
1 stop13h 12mKLM
Deal found 5/5$917
Mon 6/312:50 pmONT - EDI
1 stop14h 45mKLM
Thu 6/1312:05 pmEDI - ONT
1 stop15h 37mKLM
Deal found 5/6$937
Wed 5/81:20 pmONT - LHR
1 stop12h 40mKLM
Tue 5/1410:55 amLHR - ONT
1 stop13h 41mKLM
Deal found 5/5$943
Fri 5/101:20 pmONT - LHR
1 stop12h 40mKLM
Tue 5/1410:55 amLHR - ONT
1 stop13h 41mKLM
Deal found 5/5$993
Fri 5/241:20 pmONT - LHR
1 stop12h 40mKLM
Sun 6/210:55 amLHR - ONT
1 stop13h 41mKLM
Deal found 5/6$1,017
Fri 5/101:20 pmONT - LHR
1 stop12h 40mKLM
Wed 5/1511:00 amLHR - ONT
1 stop13h 36mKLM
Deal found 5/6$1,067

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 2,689,106 searches. Prices were last updated on May 6, 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.
Sun 5/1912:50 pmONT - LHR
1 stop17h 35mIberia
Wed 6/1211:30 amLHR - ONT
2 stops20h 29mIberia
Deal found 5/6$756
Tue 5/141:36 pmONT - LHR
1 stop12h 04mUnited Airlines
Fri 6/144:15 pmLHR - ONT
1 stop14h 12mUnited Airlines
Deal found 5/6$767
Tue 5/75:45 amONT - LHR
2 stops19h 40mDelta
Fri 5/3111:30 amLHR - ONT
2 stops19h 17mDelta
Deal found 5/6$771
Tue 5/712:50 pmONT - LHR
1 stop15h 25mAmerican Airlines
Fri 5/319:15 amLHR - ONT
1 stop17h 44mAmerican Airlines
Deal found 5/6$772
Tue 5/2112:53 pmONT - LHR
1 stop14h 12mBritish Airways
Thu 6/134:25 pmLHR - ONT
1 stop15h 34mBritish Airways
Deal found 5/6$774
Mon 5/202:50 pmONT - LHR
1 stop13h 25mIberia
Fri 5/314:25 pmLHR - ONT
1 stop15h 31mIberia
Deal found 5/4$776
Sat 5/187:40 pmONT - LHR
2 stops15h 15mAmerican Airlines
Tue 5/289:15 amLHR - ONT
1 stop17h 44mAmerican Airlines
Deal found 5/5$777
Sat 5/1810:42 amONT - LHR
2 stops35h 13mUnited Airlines
Tue 5/288:00 amLHR - ONT
2 stops20h 48mUnited Airlines
Deal found 5/5$778
Tue 5/2110:42 amONT - EDI
2 stops15h 53mUnited Airlines
Wed 5/299:40 amEDI - ONT
2 stops19h 34mUnited Airlines
Deal found 5/6$801

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 2,689,106 searches. Data last updated May 6, 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.
Wed 11/136:00 amONT - LHR
1 stop20h 00mVirgin Atlantic
Wed 11/2710:45 amLHR - ONT
1 stop13h 27mVirgin Atlantic
Deal found 5/6$637
Tue 9/1712:00 pmONT - LGW
1 stop14h 35mMultiple Airlines
Tue 10/112:00 pmLGW - ONT
1 stop14h 09mMultiple Airlines
Deal found 5/5$646
Tue 11/126:34 amONT - LHR
1 stop15h 46mIberia
Thu 11/289:15 amLHR - ONT
2 stops22h 52mIberia
Deal found 5/5$651
Mon 9/3010:48 amONT - LHR
1 stop19h 22mUnited Airlines
Fri 10/118:30 amLHR - ONT
2 stops36h 37mUnited Airlines
Deal found 5/5$652
Mon 9/305:15 amONT - LHR
2 stops16h 40mUnited Airlines
Fri 10/118:30 amLHR - ONT
2 stops36h 37mUnited Airlines
Deal found 5/5$657
Tue 10/292:00 pmONT - LHR
1 stop14h 40mDelta
Fri 11/86:20 amLHR - ONT
2 stops17h 52mDelta
Deal found 5/6$662
Tue 10/296:00 amONT - LHR
2 stops18h 05mDelta
Fri 11/86:20 amLHR - ONT
2 stops17h 52mDelta
Deal found 5/6$666
Tue 10/293:01 pmONT - LHR
1 stop14h 04mAmerican Airlines
Fri 11/811:50 amLHR - ONT
1 stop16h 23mAmerican Airlines
Deal found 5/5$667
Wed 10/1610:50 amONT - LHR
1 stop13h 10mIberia
Thu 10/244:25 pmLHR - ONT
1 stop15h 01mIberia
Deal found 5/5$669

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 2,689,106 searches. Data last updated May 6, 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.
Sun 5/1912:50 pmONT - LHR
1 stop17h 35mIberia
Wed 6/1211:30 amLHR - ONT
2 stops20h 29mIberia
Deal found 5/6$756
Tue 5/712:50 pmONT - LHR
1 stop14h 20mDelta
Fri 5/3111:30 amLHR - ONT
2 stops19h 17mDelta
Deal found 5/6$767
Tue 5/75:45 amONT - LHR
2 stops19h 40mDelta
Fri 5/3111:30 amLHR - ONT
2 stops19h 17mDelta
Deal found 5/6$771
Tue 5/712:50 pmONT - LHR
1 stop15h 25mAmerican Airlines
Fri 5/319:15 amLHR - ONT
1 stop17h 44mAmerican Airlines
Deal found 5/6$772
Wed 5/151:20 pmONT - LHR
1 stop12h 40mKLM
Wed 5/2911:00 amLHR - ONT
1 stop13h 36mKLM
Deal found 5/6$774
Mon 5/2010:34 amONT - LHR
1 stop13h 31mIberia
Wed 5/294:25 pmLHR - ONT
1 stop15h 31mIberia
Deal found 5/6$776
Mon 5/2010:34 amONT - LHR
1 stop17h 41mIberia
Mon 5/2711:30 amLHR - ONT
2 stops20h 26mIberia
Deal found 5/6$806
Sat 5/1811:59 pmONT - LHR
1 stop26h 46mBritish Airways
Tue 5/2810:05 amLHR - ONT
1 stop16h 17mBritish Airways
Deal found 5/6$813
Thu 5/161:36 pmONT - LHR
1 stop14h 44mUnited Airlines
Wed 5/2911:05 amLHR - ONT
1 stop14h 23mUnited Airlines
Deal found 5/6$815

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 2,689,106 searches. Data last updated May 6, 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.
Sun 6/3012:59 amONT - LGW
2 stops25h 01mMultiple Airlines
Deal found 5/5$397
Tue 6/2512:59 amONT - LGW
2 stops25h 01mMultiple Airlines
Deal found 5/4$417
Wed 6/125:41 pmONT - LGW
3 stops31h 19mMultiple Airlines
Deal found 5/6$422
Sun 7/712:49 amONT - LHR
2 stops35h 31mMultiple Airlines
Deal found 5/6$455
Wed 10/1612:45 pmONT - LGW
2 stops23h 15mIberia
Deal found 5/5$505
Tue 10/152:52 pmONT - LGW
2 stops21h 08mIberia
Deal found 5/5$507
Sun 10/137:00 amONT - LCY
2 stops16h 15mDelta
Deal found 5/5$527
Mon 6/1712:54 pmONT - LHR
3 stops47h 26mMultiple Airlines
Deal found 5/5$542
Sat 6/2212:58 amONT - LGW
2 stops22h 02mMultiple Airlines
Deal found 5/5$560

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 2,689,106 searches. Data last updated May 6, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$646 - $926

Route

Depart

Return

Price

OntarioLondon Gatwick

ONT - LGW

ONTLGW

Ontario

Tue 9/17

1 stop14h 35m

London Gatwick

Tue 10/1

1 stop14h 09m

$646

OntarioLondon Gatwick

ONT - LGW

ONTLGW

Ontario

Tue 9/17

2 stops19h 00m

London Gatwick

Tue 10/1

2 stops18h 28m

$690

OntarioGlasgow Intl

ONT - GLA

ONTGLA

Ontario

Tue 10/1

2 stops18h 00m

Glasgow Intl

Thu 10/10

2 stops18h 28m

$733

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Fri 8/2

1 stop12h 40m

London Heathrow

Thu 8/29

1 stop14h 12m

$749

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Sun 5/19

1 stop17h 35m

London Heathrow

Wed 6/12

2 stops20h 29m

$756

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Sat 5/18

2 stops15h 15m

London Heathrow

Tue 5/28

1 stop17h 44m

$777

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Fri 5/17

1 stop12h 40m

London Heathrow

Thu 5/30

1 stop13h 41m

$828

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Mon 5/20

1 stop17h 15m

Manchester

Wed 6/5

2 stops18h 41m

$834

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 6/4

2 stops41h 20m

London Heathrow

Fri 6/14

2 stops43h 08m

$926

Flights are sorted by cheapest first

Deals found on 5/5

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 6, 2024.
Get a feel of what it's like to fly with United Airlines, KLM and Iberia 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
8.1
Very good
10,818 reviews
Check prices

Entertainment

8.0

Food

7.4

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

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

Delta
8.1
Very good
10,818 reviews
Delta
8.1
Very good
10,818 reviews
Check prices

Entertainment

8.0

Food

7.4

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

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

KLM
7.9
Good
1,602 reviews
Delta
8.1
Very good
10,818 reviews
Check prices

Entertainment

8.0

Food

7.4

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

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

Finnair
7.8
Good
1,379 reviews
Delta
8.1
Very good
10,818 reviews
Check prices

Entertainment

8.0

Food

7.4

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

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
740 reviews
Delta
8.1
Very good
10,818 reviews
Check prices

Entertainment

8.0

Food

7.4

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

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

JetBlue
7.6
Good
4,535 reviews
Delta
8.1
Very good
10,818 reviews
Check prices

Entertainment

8.0

Food

7.4

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

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 Multiple Airlines for just $646, but on average you can expect to pay $767.

  • 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 Iberia, with whom users have recently found tickets for as low as $505. However, be on the lookout for offers from Delta and United Airlines, 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 - London Gatwick or Ontario - Edinburgh Turnhouse 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 5/6.

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 2,689,106 searches. Data last updated May 6, 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$597Average$912FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$617Average$670FlexibilityNo 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
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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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