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Cheap flights from Kentucky to Heathrow (LHR) from $387

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 7/17. 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.
SDF — LHR
May 14 — May 211
From?
To?
Tue 5/14
Tue 5/21
1 adult, Economy
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How far in advance should I book a flight from Kentucky to London Heathrow Airport?

To save up to 27% on this flight, we recommend booking at least 9 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Kentucky to London Heathrow Airport from $588 1-2 weeks out and tickets from $1,146 for flights departing within the next 72 hours.

What is the cheapest month to fly from Kentucky to London Heathrow Airport?

February is one of the best times of the year to fly to London Heathrow Airport from Kentucky. Prices for February average $937 per person but you can even find prices for as low as $653. The most expensive prices can be found in the month of June. Opting for a February flight can save you 61% on your journey compared to booking in June

When is the cheapest time to fly from Kentucky to London Heathrow Airport (KY - LHR)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Kentucky to London Heathrow Airport as you normally would.

Cheap British Airways flights from Kentucky to Heathrow

Explore cheap flight options specifically provided by British Airways for the route between Kentucky and Heathrow. 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 2,749,864 searches. Data last updated May 9, 2024.
Consider these cheap British Airways flights we've found departing from Kentucky to London. It's recommended that users confirm their flight details before booking.
Sat 8/176:24 pmLEX - LHR
1 stop12h 51mBritish Airways
Tue 8/272:25 pmLHR - LEX
1 stop13h 16mBritish Airways
Deal found 5/7$728
Sun 9/227:10 amSDF - LHR
1 stop10h 00mBritish Airways
Thu 10/38:10 amLHR - SDF
1 stop12h 20mBritish Airways
Deal found 5/8$739
Tue 8/201:11 pmSDF - LHR
1 stop18h 04mBritish Airways
Tue 9/106:55 amLHR - SDF
2 stops21h 50mBritish Airways
Deal found 5/8$745
Mon 9/162:10 pmLEX - LHR
1 stop12h 40mBritish Airways
Wed 9/256:10 amLHR - LEX
2 stops19h 43mBritish Airways
Deal found 5/6$747
Mon 9/163:55 pmLEX - LHR
1 stop10h 50mBritish Airways
Tue 9/248:10 amLHR - LEX
1 stop12h 23mBritish Airways
Deal found 5/6$767
Mon 9/165:12 pmLEX - LHR
1 stop12h 08mBritish Airways
Tue 9/246:10 amLHR - LEX
2 stops19h 43mBritish Airways
Deal found 5/6$772
Tue 10/13:55 pmLEX - LHR
1 stop10h 50mBritish Airways
Sat 10/121:10 pmLHR - LEX
1 stop12h 43mBritish Airways
Deal found 5/7$789
Tue 8/206:54 pmSDF - LHR
1 stop10h 26mBritish Airways
Mon 9/96:50 amLHR - SDF
2 stops21h 55mBritish Airways
Deal found 5/8$795
Mon 5/2012:00 pmLEX - LHR
1 stop14h 50mBritish Airways
Mon 5/2711:05 amLHR - LEX
1 stop16h 48mBritish Airways
Deal found 5/6$805

Cheap Delta flights from Kentucky to Heathrow

Explore cheap flight options specifically provided by Delta for the route between Kentucky and Heathrow. 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 2,749,864 searches. Data last updated May 9, 2024.
Take a gander at the lowest prices we've found on Delta flights from Kentucky to London. Deals are refreshing constantly so come back soon for more options.
Tue 8/136:35 pmLEX - LHR
1 stop13h 40mDelta
Wed 8/216:15 amLHR - LEX
2 stops20h 04mDelta
Deal found 5/7$748
Tue 8/131:30 pmLEX - LHR
2 stops14h 55mDelta
Wed 8/216:15 amLHR - LEX
2 stops20h 04mDelta
Deal found 5/7$753
Tue 8/1310:55 amLEX - LHR
2 stops14h 25mDelta
Wed 8/219:00 amLHR - LEX
2 stops19h 53mDelta
Deal found 5/8$773
Mon 8/123:35 pmLEX - LHR
1 stop14h 35mDelta
Tue 8/201:55 pmLHR - LEX
1 stop12h 24mDelta
Deal found 5/7$775
Tue 10/111:50 amLEX - LHR
1 stop13h 55mDelta
Fri 10/1112:45 pmLHR - LEX
1 stop13h 29mDelta
Deal found 5/7$799
Tue 5/146:42 pmLEX - LHR
1 stop13h 33mDelta
Sat 5/2512:55 pmLHR - LEX
2 stops16h 00mDelta
Deal found 5/7$2,634
Mon 5/133:44 pmLEX - LHR
1 stop11h 06mDelta
Fri 5/241:55 pmLHR - LEX
1 stop12h 21mDelta
Deal found 5/7$3,984

Cheap Kentucky to Heathrow flights in May & June 2024

Find cheap flight options from Kentucky to Heathrow specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,749,864 searches. Prices were last updated on May 9, 2024.
Listed are some of the best fares we've found on flights departing from Kentucky to London in 2024. Check back in a little while for more flight options.
Wed 5/1512:25 pmSDF - LHR
1 stop12h 30mUnited Airlines
Wed 6/128:40 amLHR - SDF
2 stops19h 04mUnited Airlines
Deal found 5/8$739
Wed 5/156:46 amSDF - LHR
1 stop10h 24mAmerican Airlines
Wed 6/1212:15 pmLHR - SDF
1 stop16h 37mAmerican Airlines
Deal found 5/8$754
Sun 5/195:55 amSDF - LHR
1 stop19h 00mAir Canada
Sat 6/19:30 amLHR - SDF
2 stops15h 46mAir Canada
Deal found 5/8$780
Sun 5/195:55 amSDF - LHR
1 stop19h 00mAir Canada
Sat 6/18:30 amLHR - SDF
1 stop19h 14mAir Canada
Deal found 5/8$782
Mon 5/202:03 pmLEX - LHR
1 stop13h 27mUnited Airlines
Mon 5/272:05 pmLHR - LEX
2 stops26h 24mUnited Airlines
Deal found 5/6$783
Mon 5/2012:00 pmLEX - LHR
1 stop14h 50mBritish Airways
Mon 5/2711:05 amLHR - LEX
1 stop16h 48mBritish Airways
Deal found 5/6$805
Wed 5/2911:55 amSDF - LHR
2 stops17h 05mUnited Airlines
Wed 6/58:40 amLHR - SDF
2 stops16h 39mUnited Airlines
Deal found 5/8$884
Wed 5/292:30 pmSDF - LHR
1 stop15h 10mUnited Airlines
Wed 6/57:25 amLHR - SDF
2 stops17h 54mUnited Airlines
Deal found 5/8$887
Wed 5/2212:15 pmLEX - LHR
1 stop12h 40mUnited Airlines
Wed 5/296:50 amLHR - LEX
2 stops14h 39mUnited Airlines
Deal found 5/8$892

Kentucky to Heathrow 2024 flight deals

Discover exclusive flight deals for travel between Kentucky and Heathrow in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,749,864 searches. Data last updated May 9, 2024.
Listed are some of the best fares we've found on flights departing from Kentucky to London in 2024. Check back in a little while for more flight options.
Mon 8/1911:46 amSDF - LHR
1 stop16h 19mAmerican Airlines
Tue 8/273:15 pmLHR - SDF
1 stop12h 02mAmerican Airlines
Deal found 5/8$675
Mon 8/199:48 amSDF - LHR
1 stop15h 57mUnited Airlines
Tue 8/279:30 amLHR - SDF
2 stops31h 47mUnited Airlines
Deal found 5/8$676
Mon 10/712:25 pmSDF - LHR
1 stop14h 05mAmerican Airlines
Thu 10/316:50 amLHR - SDF
2 stops14h 54mAmerican Airlines
Deal found 5/9$707
Tue 8/2010:53 amLEX - LHR
1 stop15h 37mAmerican Airlines
Tue 9/107:40 amLHR - LEX
2 stops14h 59mAmerican Airlines
Deal found 5/8$714
Tue 8/205:51 pmLEX - LHR
2 stops11h 59mAmerican Airlines
Tue 9/107:40 amLHR - LEX
2 stops14h 59mAmerican Airlines
Deal found 5/8$718
Thu 8/2211:46 amSDF - LHR
1 stop14h 44mAmerican Airlines
Wed 8/289:15 amLHR - SDF
1 stop18h 02mAmerican Airlines
Deal found 5/8$725
Sat 8/172:00 pmLEX - LHR
1 stop10h 55mUnited Airlines
Tue 8/272:05 pmLHR - LEX
2 stops28h 16mUnited Airlines
Deal found 5/7$726
Sat 8/176:24 pmLEX - LHR
1 stop12h 51mBritish Airways
Tue 8/272:25 pmLHR - LEX
1 stop13h 16mBritish Airways
Deal found 5/7$728
Mon 8/193:53 pmLEX - LHR
1 stop12h 12mAmerican Airlines
Thu 9/268:50 amLHR - LEX
2 stops13h 49mAmerican Airlines
Deal found 5/7$734

Kentucky to Heathrow flights leaving soon

Find last-minute flight options from Kentucky to Heathrow 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 2,749,864 searches. Data last updated May 9, 2024.
Consider one of these great deals we found on last-minute flights from Kentucky to London. Tip: verify your flight details before completing your reservation.
Wed 5/1512:25 pmSDF - LHR
1 stop12h 30mUnited Airlines
Wed 6/128:40 amLHR - SDF
2 stops19h 04mUnited Airlines
Deal found 5/8$739
Wed 5/156:46 amSDF - LHR
1 stop10h 24mAmerican Airlines
Wed 6/1212:15 pmLHR - SDF
1 stop16h 37mAmerican Airlines
Deal found 5/8$754
Sun 5/195:55 amSDF - LHR
1 stop19h 00mAir Canada
Sat 6/19:30 amLHR - SDF
2 stops15h 46mAir Canada
Deal found 5/8$780
Sun 5/195:55 amSDF - LHR
1 stop19h 00mAir Canada
Sat 6/18:30 amLHR - SDF
1 stop19h 14mAir Canada
Deal found 5/8$782
Mon 5/202:03 pmLEX - LHR
1 stop13h 27mUnited Airlines
Mon 5/272:05 pmLHR - LEX
2 stops26h 24mUnited Airlines
Deal found 5/6$783
Mon 5/2012:00 pmLEX - LHR
1 stop14h 50mBritish Airways
Mon 5/2711:05 amLHR - LEX
1 stop16h 48mBritish Airways
Deal found 5/6$805
Mon 5/2012:15 pmLEX - LHR
2 stops15h 05mUnited Airlines
Mon 5/276:50 amLHR - LEX
2 stops14h 39mUnited Airlines
Deal found 5/6$1,007
Sun 5/1912:25 pmSDF - LHR
2 stops16h 50mUnited Airlines
Sat 6/16:50 amLHR - SDF
2 stops15h 04mUnited Airlines
Deal found 5/8$1,025
Wed 5/1512:48 pmSDF - LHR
2 stops16h 12mMultiple Airlines
Wed 6/126:00 amLHR - SDF
3 stops34h 43mMultiple Airlines
Deal found 5/8$1,123

One-way flights to Heathrow from Kentucky

Search for one-way flight options from Kentucky to Heathrow. 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 2,749,864 searches. Data last updated May 9, 2024.
If you're seeking multiple options on one-way flights from Kentucky to London, be sure to check out these deals, which are updated often. Users in need of a round-trip flight from Kentucky to London instead should update the search form at the top of page.
Wed 7/175:30 amSDF - LHR
3 stops25h 25mMultiple Airlines
Deal found 5/8$387
Wed 6/126:39 pmSDF - LHR
3 stops45h 56mMultiple Airlines
Deal found 5/8$454
Wed 6/195:45 amSDF - LHR
3 stops26h 40mMultiple Airlines
Deal found 5/8$481
Thu 6/137:45 amSDF - LHR
3 stops25h 55mMultiple Airlines
Deal found 5/8$484
Tue 6/117:45 amSDF - LHR
3 stops24h 40mMultiple Airlines
Deal found 5/8$501
Sat 6/159:43 pmSDF - LHR
3 stops38h 57mMultiple Airlines
Deal found 5/8$519
Tue 7/161:10 pmSDF - LHR
1 stop12h 10mUnited Airlines
Deal found 5/8$548
Sun 6/167:45 amSDF - LHR
3 stops28h 55mMultiple Airlines
Deal found 5/8$552
Sun 7/148:45 amSDF - LHR
3 stops16h 45mAir Canada
Deal found 5/8$554

Find flights from Kentucky to Heathrow within your budget

Customize your flight search to find flights from Kentucky to Heathrow 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 2,749,864 searches. Data last updated May 9, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$675 - $901

Route

Depart

Return

Price

Louisville IntlLondon Heathrow

SDF - LHR

SDFLHR

Louisville Intl

Mon 8/19

1 stop16h 19m

London Heathrow

Tue 8/27

1 stop12h 02m

$675

Louisville IntlLondon Heathrow

SDF - LHR

SDFLHR

Louisville Intl

Mon 8/19

1 stop15h 57m

London Heathrow

Tue 8/27

2 stops31h 47m

$676

Lexington Blue GrassLondon Heathrow

LEX - LHR

LEXLHR

Lexington Blue Grass

Sat 8/17

1 stop12h 51m

London Heathrow

Tue 8/27

1 stop13h 16m

$728

Lexington Blue GrassLondon Heathrow

LEX - LHR

LEXLHR

Lexington Blue Grass

Tue 8/13

1 stop13h 40m

London Heathrow

Wed 8/21

2 stops20h 04m

$748

Louisville IntlLondon Heathrow

SDF - LHR

SDFLHR

Louisville Intl

Tue 9/24

1 stop18h 45m

London Heathrow

Thu 10/3

1 stop12h 09m

$750

Lexington Blue GrassLondon Heathrow

LEX - LHR

LEXLHR

Lexington Blue Grass

Tue 8/13

1 stop14h 30m

London Heathrow

Wed 8/21

1 stop12h 58m

$755

Louisville IntlLondon Heathrow

SDF - LHR

SDFLHR

Louisville Intl

Fri 8/23

2 stops16h 02m

London Heathrow

Tue 8/27

2 stops14h 35m

$770

Lexington Blue GrassLondon Heathrow

LEX - LHR

LEXLHR

Lexington Blue Grass

Tue 7/30

1 stop16h 46m

London Heathrow

Mon 8/19

2 stops29h 24m

$771

Lexington Blue GrassLondon Heathrow

LEX - LHR

LEXLHR

Lexington Blue Grass

Mon 10/7

2 stops16h 55m

London Heathrow

Tue 10/15

2 stops16h 18m

$901

Flights are sorted by cheapest first

Deals found on 5/8

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

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated May 9, 2024.
To help decide which airline to fly from Kentucky to London, see what other customers have to say about British Airways, Delta and KLM. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,793 reviews
Check prices

Food

7.4

Entertainment

8.0

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Delta
8.1
Very good
10,793 reviews
Delta
8.1
Very good
10,793 reviews
Check prices

Food

7.4

Entertainment

8.0

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

KLM
7.9
Good
1,592 reviews
Delta
8.1
Very good
10,793 reviews
Check prices

Food

7.4

Entertainment

8.0

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

SWISS
7.8
Good
2,012 reviews
Delta
8.1
Very good
10,793 reviews
Check prices

Food

7.4

Entertainment

8.0

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Virgin Atlantic
7.7
Good
739 reviews
Delta
8.1
Very good
10,793 reviews
Check prices

Food

7.4

Entertainment

8.0

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

United Airlines
7.4
Good
11,050 reviews
Delta
8.1
Very good
10,793 reviews
Check prices

Food

7.4

Entertainment

8.0

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Related info for your journey

Find useful and relevant information for your journey from Kentucky to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find flights from Kentucky to London Heathrow Airport for under $700 on Cheapflights?

    Yes, there are multiple flights from Kentucky to London Heathrow Airport for under $700. The cheapest flight booked recently is on American Airlines for just $675, but on average you can expect to pay $730.

  • Are there last-minute flights available from Kentucky to London Heathrow Airport for under $800?

    There are currently 20+ open flights from Kentucky to London Heathrow Airport within the next 7 days for less than $800.

  • What are the cheapest airlines to fly from Kentucky to London Heathrow Airport one-way?

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $548. However, be on the lookout for offers from Air Canada and British Airways, as they are both options that can get you from Kentucky to London Heathrow Airport for a low price.

  • What are the most popular airlines that fly from Kentucky to London Heathrow Airport?

    American Airlines, Air France and British Airways are the most popular airlines when flying from Kentucky to London Heathrow Airport.

  • What does SDF to LHR mean?

    Louisville Intl Airport is SDF and London Heathrow Airport is LHR. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service. Lexington Blue Grass Airport (LEX), Paducah Barkley Regional Airport (PAH), Owensboro Daviess County Airport (OWB) are other airports near this flight route and their unique identifiers/IATA codes.

  • Can I find deals for flights from Kentucky to Heathrow that include extra baggage allowance?

    The amount of baggage you can bring on your Kentucky to Heathrow 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 Kentucky to Heathrow with specific airlines?

    Yes, Cheapflights allows you to browse and filter Kentucky to Heathrow 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 Kentucky to Heathrow that include hotel bookings?

    Yes. In addition to deals on Kentucky to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Kentucky to Heathrow?

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

  • Can I find deals for business class flights from Kentucky to Heathrow?

    Yes. Cheapflights offers flight deals from Kentucky to Heathrow 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 Kentucky to Heathrow that allow pets onboard?

    Many airlines flying from Kentucky to Heathrow 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 Kentucky to Heathrow?

    Yes, you can often find last-minute deals on Kentucky to Heathrow 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 Kentucky to London Heathrow Airport flight deals updated?

    The Kentucky to London Heathrow Airport flight deals you see on this page were last updated on 5/9.

See more FAQs

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Alternative routes for Kentucky to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.

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Top 6 airlines flying from Kentucky to Heathrow

Discover the top 6 airlines that operate flights from Kentucky to Heathrow. 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 2,749,864 searches. Data last updated May 9, 2024.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$612Average$750FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest$615Average$872FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest$654Average$984FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$661Average$1,113FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest$690Average$1,379FlexibilityNo cancel feeOn-time77%
Search Air France flights
United AirlinesCheapest$691Average$841FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
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Search flights from Kentucky to Heathrow by cabin class

Find flights from Kentucky to Heathrow, 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 Kentucky to Heathrow?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from Kentucky today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Kentucky to Heathrow?

Cheapflights simply makes it quick and affordable to book flights from Kentucky to Heathrow by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Kentucky to Heathrow with no change fees?

Certainly. Search results for flights to Heathrow from Kentucky shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Kentucky to Heathrow become cheaper?

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