SDF - LON

$401 Find Cheap Flights from Louisville to London

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Louisville to London departing on 9/10. 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.
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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Louisville to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Louisville to London, as well as popular online travel agencies
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Cheap Flights from Louisville to London (SDF-LON)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Louisville to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Louisville to London

Mon, Sep 15 - Fri, Sep 19
 Logo
9:06 am - 10:00 amSDF-LGW
19h 54m1 stop
 Logo
2:00 pm - 8:11 amLGW-SDF
23h 11m1 stop
Tue, Jun 17 - Mon, Jun 23
 Logo
9:59 am - 10:00 amSDF-LGW
19h 01m1 stop
 Logo
2:00 pm - 9:09 amLGW-SDF
24h 09m1 stop
Tue, Sep 2 - Thu, Sep 11
American Airlines Logo
7:11 pm - 12:45 pmSDF-LHR
12h 34m1 stop
American Airlines Logo
2:25 pm - 11:03 pmLHR-SDF
13h 38m1 stop
$642American Airlines
Find Deal
Tue, Sep 30 - Tue, Oct 7
British Airways Logo
6:54 pm - 12:15 pmSDF-LHR
12h 21m1 stop
British Airways Logo
6:10 am - 6:24 pmLHR-SDF
17h 14m2 stops
$648British Airways
Find Deal
Mon, Sep 29 - Mon, Oct 6
British Airways Logo
2:37 pm - 10:55 amSDF-LHR
15h 18m1 stop
British Airways Logo
7:25 pm - 6:24 pmLHR-SDF
27h 59m2 stops
$656British Airways
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Tue, Oct 14 - Tue, Oct 21
United Airlines Logo
10:55 am - 6:20 amSDF-LHR
14h 25m1 stop
United Airlines Logo
2:05 pm - 2:50 pmLHR-SDF
29h 45m2 stops
$669United Airlines
Find Deal
Fri, Sep 26 - Tue, Oct 7
United Airlines Logo
12:15 pm - 5:55 amSDF-LHR
12h 40m1 stop
United Airlines Logo
8:30 am - 8:32 pmLHR-SDF
17h 02m2 stops
$729United Airlines
Find Deal
Fri, Oct 17 - Sat, Oct 25
Delta Logo
2:59 pm - 10:15 amSDF-LHR
14h 16m2 stops
Delta Logo
12:25 pm - 11:56 pmLHR-SDF
16h 31m2 stops
$797Delta
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Sun, Jul 20 - Sat, Aug 2
American Airlines Logo
8:02 pm - 12:30 pmSDF-LHR
11h 28m1 stop
American Airlines Logo
3:00 pm - 10:06 pmLHR-SDF
12h 06m1 stop
$1,010American Airlines
Find Deal
Fri, Jul 25 - Mon, Aug 4
Delta Logo
12:50 pm - 8:50 amSDF-LHR
15h 00m2 stops
Delta Logo
6:15 am - 4:48 pmLHR-SDF
15h 33m2 stops
$1,082Delta
Find Deal
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KAYAK's insights & trends for Louisville to London flights

Get data-powered insights and trends into flights from Louisville to London to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Louisville to London?

The average price of all round-trip flights from Louisville to London clicked on KAYAK for each day over the last 12 months.

For Louisville to London, Wednesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from London back to Louisville, the best deals are generally found on Friday, with Tuesday being the most expensive.

What is the cheapest month to fly from Louisville to London?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Louisville to London, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Louisville to London is October, where tickets cost $710 (return) on average. On the other hand, the most expensive months are December and January, where the average cost of round-trip tickets is $1,283 and $1,264 respectively.

How far in advance should I book a flight from Louisville to London?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Louisville to London, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Louisville to London, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know

Low seasonJanuary
High seasonApril
Cheapest flight$401
Best time to beat the crowds but there is an average 29% increase in price.
Most popular time to fly and prices are also 13% lower on average.
Flight from Louisville to London Heathrow Airport

When to book flights from Louisville to London

Are your dates flexible? Find out the best times to travel from Louisville to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Louisville to London

  • Will I pay extra for pre-selecting a seat when flying from Louisville International Airport, Kentucky, to London?

    Virgin Atlantic allows you to select a seat from a seat map. Gold and Silver members can choose any standard seat when booking SDF-LHR flights without a charge. The seat assignment is usually done at check-in unless you're traveling in the Economy Light cabin, in which case you'll pay a small fee for pre-selection.

  • Will my child get a reduced ticket price from Louisville International Airport (SDF) to London?

    All children aged 0 to 23 months sit on adult laps throughout the flight. Older kids up to age 12 are charged less by KLM Airlines. So, when booking your flight through KAYAK, indicate your child's age to see an automatic fare reduction.

  • Are there airlines with fully flat beds on this route?

    The Business class cabin by British Airways has lie-flat seats. With a Club World ticket, you'll enjoy flying in a seat that extends into a flatbed (6 feet long). These seats have lumbar support and a fully adjustable headrest. You may request bedding for added comfort.

  • Can I travel to London with other animals besides cats and dogs?

    Always check the airline's pet policy before planning a trip with any animal. Iberia Airlines allows pets in the passenger cabin (18lb or less, including the cage), in the hold as extra baggage, or cargo compartment. You may bring a cat, dog, tortoise, fish, and bird accompanied by the correct documents. They, however, do not permit dangerous breeds and brachycephalic animals.

  • What is the cheapest flight from Louisville to London?

    In the last 3 days, the lowest price for a flight from Louisville to London was $401 for a one-way ticket and $604 for a round-trip.

  • Do I need a passport to fly between Louisville and London?

    Yes

  • Which airports will I be using when flying from Louisville to London?

    On your way to London, you’ll fly out from Louisville Intl. You’ll be landing in one of London’s 2 airports: London Gatwick or London Heathrow.

  • Which aircraft models fly most regularly from Louisville to London?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Louisville to London?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between Louisville and London, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Louisville to London, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Louisville to London are Delta and United Airlines. With an average price for the route of $1,047 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $959 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Louisville to London?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Louisville to London.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Louisville to London?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Louisville is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Louisville to London?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Louisville with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Louisville to London?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Louisville up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Louisville to London

  • Most carriers operating flights from Louisville International Airport (SDF) to London Heathrow (LHR) have a single stopover. American Airlines stop at Boston Logan (BOS), O'Hare Intl Airport (ORD), or Charlotte Douglas Airport (CLT), while United connects via Dulles Airport (IAD). If you wish to land at London Gatwick (LGW), you might have two stopovers at Atlanta Airport (ATL) and John F. Kennedy Airport (JFK).
  • Suppose your physique prevents you from sitting in a single seat. You can get more personal space for better comfort while on the route SDF-IAD-FRA-LCY, often operated by Lufthansa. Consider reserving an empty adjacent seat with the airline. However, you can only pay the extra fee at the check-in counter on your departure date.
  • You only need a visa to fly to London if you plan to stay in the United Kingdom for over six months. You'll get a visa vignette or sticker on your passport at the airport's immigration office. To extend your business trip or vacation for another six months, complete the UK visa renewal form, pay the applicable fees, and book an appointment at any UKVCAS office for biometrics.
  • British Airways is one of the best airlines for wheelchair users. If you have a mobility issue, you can specify the type of assistance you need when booking your flight. Special assistance includes basic wheelchair assistance and full-service- luggage storage and retrieval, boarding and alighting the aircraft, and chair aid to move around the cabin.
  • Children through age 17 are automatically subject to unaccompanied minor protocols, and the standard unaccompanied minor fee is charged where applicable. With United Airlines, the service is available for kids between 5 and 14 and is optional for the age bracket 15-17. When booking tickets for kids traveling alone, inform the airline who will drop them off at SDF and pick them up from the arrival airport in London.

Top 5 airlines serving from Louisville to London

 
See real verified KAYAK customer reviews for airlines flying from Louisville to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Louisville to London? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 7950 reviews
8.2Boarding
8.5Crew
7.9Entertainment
7.9Comfort
7.3Food
Airline reviews

I always fly Delta main cabin and pay to upgrade my seat to preferred/extra leg room. However this time even with the buying the upgraded seat I was extremely cramped with very little legroom and unable to move comfortably. For some reason meal service was very early in the flight and my row seemed to have been skipped. Most of my attendant calls were unanswered. I was unable to get extra water, or crackers/snacks to make up for my missed meal. I always carry protein bars in my personal bag, but with no extra legroom I wasn’t able to access from underseat in front of me. I am unable to sleep while flying so I read and count on in flight entertainment. However the passenger in front of me reclined their seat fully preventing me from being able to view the screen or be able to rest my book on tray table to read. One of the first times I’ve been completely disappointed in Delta. I fly internationally 2-3 times a year.

6.0 GoodCynthia, May 2025MSP - AMS
Read more Delta reviews

I always fly Delta main cabin and pay to upgrade my seat to preferred/extra leg room. However this time even with the buying the upgraded seat I was extremely cramped with very little legroom and unable to move comfortably. For some reason meal service was very early in the flight and my row seemed to have been skipped. Most of my attendant calls were unanswered. I was unable to get extra water, or crackers/snacks to make up for my missed meal. I always carry protein bars in my personal bag, but with no extra legroom I wasn’t able to access from underseat in front of me. I am unable to sleep while flying so I read and count on in flight entertainment. However the passenger in front of me reclined their seat fully preventing me from being able to view the screen or be able to rest my book on tray table to read. One of the first times I’ve been completely disappointed in Delta. I fly internationally 2-3 times a year.

Good flights. On time. They had a gluten free snack option which was nice

Take this flight once or twice a month. Just don’t cut it from the schedule.

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

Food from the flight from Atlanta to Santiago was very poor..

Flight was delayed due to weather. Crew did a nice job of making us comfortable. No complain complaints.

Our bag was lost so that made unnecessary chaos On our trip

Delta is my preferred airline. I've traveled with them for years. On time in most cases, good communication, easy to use app. Most planes are pretty nice. I was on a CRJ 700/900 however, which was pretty badly aged inside and needed a refresh. No infotainment, unreliable wifi, best to download before boarding or bring a book. Food choices are really just snacks on this flight, nice variety but about what you'd expect. Great staff and prompt in departure and early arrival too. Overall quite satisfied.

Crew was friendly Love the entertainment in the seat head rest.

Delta flight was on time, seats were comfortable, and crew was nice.

Turbulent taking off & landing to Dulles from Raleigh. Flight from Dulles to Tokyo very good!!

Delay and keep changing gates. I have to run around from B to C then to E.

I fly UAL 7-8 times per year. This flight was not up to snuff because it boarded very late "due to unexpected delays in restocking the plane" and yet Flight Aware showed the plane had landed some 10 hours earlier--so I think they could have planned accordingly. The FA's were nice but harried. The video system had to be rebooted 3-4 times. The food service was rather abrupt; they forgot my row and when I asked for my meal, they brought it with some impatience. Overall, the flight was fine, but the little details made it feel somewhat mundane and hurried.

They hired a new catering company the same day of my flight. They botched the job by not delivering the right carts and after THREE HOURS waiting, the flight crew timed out (flight was 19 hours long and FAA rules state crew can’t work more than 14 hours long). So they CANCELED OUR FLIGHT!! Worst experience ever. Avoid UAL at all costs.

I was charged for my daughters bag when I am supposed to receive two free checked bags with my United Explorer card.

Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.

Not really their fault, but a 4.5 hour delay is pretty brutal

The schedule to Moline changed 5 times. The gate changed 6 times. That is a pathetic way to run an airline. No wonder that no one in our company flies on United Express to or from Moline. Changes happen most of the time. I learned my lesson on this trip…never again!

The personnel were professional and friendly. The Boeing 737 Max 9 is too claustrophobic and was very warm at both airport gates, and still warm in the air.

While the staff was pleasant and helpful, the following observations are for your awareness. There was some delay on the tarmac on take off and landing. The paid lunch/food offerings were limited. Entertainment was only available on WiFi at a cost.

Following a paid seat upgrade for enhanced comfort, I encountered an unacceptable odor in my assigned area. It took three hours for the crew to relocate me, and the replacement seat was unacceptably close to the lavatory, offering no improvement.

Good overall. Cannot fault the airlines. I have had better entertainment systems before ie ice in Emirates but it was not too bad. Food was decent and staff were friendly.

I did not fly by vergin atlantic from bangalore to vasco da gama

Your flight delayed at Heathrow n I almost missed my mother funeral.you idiots. I had to waste 10 hours in different airports. Thank your stars I'm not suing you.

Miami airport needs more thorough signage. It was a long walk from my transport point to the check in desk,

Flight took off an hour late. Had to stay on the tarmac for half an hour after landing. Both annoying.

We had an unfortunate experience where we had to leave the aircraft after boarding, shortly before the scheduled takeoff time, and re-board. The reason given was that a passenger felt ill and had to cancel their plans and therefor their luggage had to be found and removed.

We’ve used VA before many times the experience is always been good they have lovely staff and the food is always delicious.

Everything about the flight was amazing from check in to boarding entertainment was okay food we didn’t try.

Seats were old and dirty, for a long haul flight you expect to be able to recline and for the av to work properly. Choice for vegans was fruit….

The chicken adobo was a little too spicy but good otherwise. My personal opinion. Movie selection could be improved, too many horror movies. Could add a few more chick flicks! The flight was bumpy at times. We arrived a little early too! Flight attendants friendly.

Again flight was awesome except British Airways lost both gate checked luggage’s. Still missing

really bad they refused to check in luggages that I had purchased, even showing them the transaction receipt from british airways app the staff in miami was MEDIOCRE

Crew was great and responsive. Entertainment quit working with about 4 hours remaining on the flight. My seat cushion was broken.

Not very good , the stewardess were unfriendly and they don't like to be bothered. Cos was a night flight and they need to sleep.

British Airways staff are very polite and willing to help.

To start, I’d like to say that every American Airline personnel I interacted with on the ground, especially flight crew, was very friendly and did their best to help me out. Despite this, however, my experience with the airline was an entire mess. The 7:19 PM flight was heavily delayed due to weather, and pushed to 10:30 AM the next morning. Because of this, I had to spend the night inside of the airport. At some point later in the night, I got an email saying that the flight had been canceled. I called the support number, and the representative on the other line told me that the flight was still on and that I didn’t need to rebook. The next morning, no one came to the gate to open the door for the crew until almost 11 AM. By this time the flight crew had been waiting for over an hour, and they had called management to get someone to open the door for them multiple times. Around 11:30, the gate screen had changed to a different flight. I ended up buying a last minute ticket with Southwest airline just to get to Chicago, because the next flight with American wasn’t until 7:19 pm that day. Now, earlier that morning my suitcase had been sent ahead of me to ORD. I went to baggage claim to ask them if I could have my suitcase forwarded to where I was staying. The representative at SDF baggage claim said they could and put the claim in for me. As I was going back through TSA, I got an email that the airline had found my suitcase, but the next step was to send it BACK to SDF. I called the airline support number again, and I made it clear that my suitcase needed to stay in Chicago and to not come back to SDF. The representative told me that they would hold my suitcase at ORD and that it wasn’t going to be forwarded anywhere. Once I got there, I found that they had loaded my suitcase onto a plane to send it back to SDF. Thankfully, I had gotten to the baggage claim counter in time for them to put in a request to bring my suitcase back up. My refund with the airline is processing already, but because of this entire experience and miscommunication at every turn of the way, I will not book with American Airlines in the future.

Cabin was roomy enough to easily slide my carry on under the seat in front of me!

This particular flight wasn't very full at the back, so there were three seats available for spreading out and getting relatively comfortable

There were several issues with this flight. I have flown quite often internationally and I was surprised by the lack of presence of attendants other than meal and drink times. The food was not best but I feel that is the norm. We also had to get off the plane once in London via stairs and bus to the terminal. Anyone who had another flight had to then get another bus to another terminal. This causes me to miss my flight and have to rebook.

My flights were great and the crew on them was lovely especially the London to Barcelona flight as Al & AJ were so amazingly nice. I wish they would be my crew always as they have the best customer service. Sadly both flights were delayed the first one from Vegas was because they clearly loaded the cargo wrong the plane was off balance making us 2 hours late. This made me miss my connection and sadly it was challenging rebooking while I was on the flight. I will never use Kayak again as there was no customer service number or live chat and you rebooked me on a flight 2 days later. I had my mom call BA to change it which she did after spending an hour on hold. This should not be so difficult. My second flight was an hour delayed due to not being able to disconnect the bridge from the plane but I did finally make it home.

The delay was not communicated via text and the person who helped with check in also didn’t inform me about the delay. I ended up missing my connection and it was a waste of 5 hours. The crew didn’t mention there would be someone at the gate informing of if I would be rebooked and there was no signage. Overall a very poor experience. The British Airways app was also very buggy, and didn’t work. I will avoid flying with British Airways when possible.

A little better than outward journey but mild chaos at the boarding gate because some people with boarding cards from connecting flights had cards which weren't recognised

The BA business class cabin is excellent,very comfortable for sleeping but the service could be improved.

Surly rude flight attendants. I ordered the chicken and was given a vegetarian meal with no explanation and no opportunity to change it. I tried to order another beverage and was told by the young humorless flight attendant to “wait”. And she never came back. The seats were very uncomfortable and cramped. The last time I flew British Airways was many years ago but I remember it was amazing and the crew were very charming. This was a terrible disappointment given the cost of the flight.

Nice flight, attentive crew, soft landing by the Pilot,, comfortable seat.

I paid for business class…. And was counting on the usual packet of toilettes to be provided. They were not because not enough were brought on the plane so they could t give to some and not all. So no tooth brush nor eye cover. Then NO coffee since there was no hot water. The lay I er too short because of delays and my luggage didn’t make the next flight!! It is now a day later and I am awaiting to hear if my bag has arrived. Very inconvenient!. I suppose I need to be glad that I spend over $4000 since I doubt those in coach or premium economy even made that next flight..Heathrow is the worst.

The flight from Seattle was delayed, which made me miss my connection to Florence. I was re-booked NINE HOURS LATER!!! That’s basically a vacation day lost. British Airways needs to partner with other airlines when possible to get a more realistic travel time, if delays occur. I realize there aren’t many flights to Florence from London, so I would book differently were I to return. The actual flight from Seattle was very comfortable and the crew was great, no faults there. I enjoy British Airways, this was an anomaly.

The crew could not have been more helpful, my meal was excellent, I slept peacefully until right before landing, and the BA lounge was a godsend. The only negative I encountered was the coffee both on the plane and in the lounge. Not to my taste but that’s a personal preference.

I don’t understand why a reputable airline like BA would delegate their London flights to AA. Makes no sense to me, as most domestic carriers do such a poor job these days. Terminal 3 at LHR is a total dump

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