$341 Find Cheap Flights from Louisville to Portugal

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 Portugal departing on 3/1. 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.
1 adult
1 adult, Economy, 0 bags

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Book Cheap Louisville to Portugal Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Louisville to Portugal 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 Portugal

Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
8:47 am - 9:20 am
SDF
-
LIS
19h 33m
2 stops
United Airlines Logo
11:25 am - 8:16 pm
LIS
-
SDF
37h 51m
2 stops
$491United Airlines
Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
2:30 pm - 9:20 am
SDF
-
LIS
37h 50m
2 stops
United Airlines Logo
11:25 am - 4:41 pm
LIS
-
SDF
34h 16m
2 stops
$492United Airlines
Wed, Mar 11 - Wed, Mar 18
Lufthansa Logo
1:58 pm - 10:50 pm
SDF
-
LIS
28h 52m
2 stops
Lufthansa Logo
5:00 am - 11:59 pm
LIS
-
SDF
22h 59m
2 stops
$516Lufthansa
Sun, Apr 5 - Mon, Apr 13
United Airlines Logo
9:55 am - 10:30 am
SDF
-
LIS
19h 35m
1 stop
United Airlines Logo
5:05 am - 11:46 pm
LIS
-
SDF
23h 41m
2 stops
$540United Airlines
Wed, Mar 4 - Thu, Mar 12
United Airlines Logo
9:50 am - 10:15 am
SDF
-
LIS
19h 25m
1 stop
United Airlines Logo
5:00 am - 7:31 pm
LIS
-
SDF
18h 31m
2 stops
$545United Airlines
Wed, Mar 4 - Thu, Mar 12
United Airlines Logo
1:50 pm - 10:15 am
SDF
-
LIS
15h 25m
2 stops
United Airlines Logo
5:00 am - 8:14 pm
LIS
-
SDF
19h 14m
2 stops
$549United Airlines
Wed, Mar 4 - Thu, Mar 12
United Airlines Logo
9:50 am - 10:15 am
SDF
-
LIS
19h 25m
1 stop
United Airlines Logo
10:15 am - 7:31 pm
LIS
-
SDF
13h 16m
1 stop
$557United Airlines
Sat, May 2 - Wed, May 13
Lufthansa Logo
7:20 pm - 10:15 pm
SDF
-
LIS
21h 55m
2 stops
Lufthansa Logo
5:05 am - 5:01 pm
LIS
-
SDF
16h 56m
2 stops
$561Lufthansa
Sat, May 2 - Fri, May 15
American Airlines Logo
12:45 pm - 11:50 am
SDF
-
LIS
18h 05m
2 stops
American Airlines Logo
7:20 am - 7:02 pm
LIS
-
SDF
16h 42m
2 stops
$579American Airlines
Sat, May 2 - Mon, May 11
Lufthansa Logo
7:20 pm - 10:15 pm
SDF
-
LIS
21h 55m
2 stops
Lufthansa Logo
4:20 pm - 5:01 pm
LIS
-
SDF
29h 41m
2 stops
$582Lufthansa
Booking Insights

KAYAK's insights & trends for Louisville to Portugal flights

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Louisville to Portugal, 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 Portugal is December, when tickets cost $641 (return) on average. On the other hand, the most expensive months are May and July, when the average cost of round-trip tickets is $1,297 and $1,203 respectively.

Good to know

Low seasonJanuary
Cheapest flight$341
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly and prices are also 11% lower on average.
Flight from Louisville to Lisbon

FAQs - booking Portugal flights

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

    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 Portugal.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Louisville to Portugal 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 Portugal?

    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 from Louisville to Portugal with an airline and back with another airline.

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

    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 from Louisville to Portugal up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Louisville to Portugal

 
Need help choosing which airline to fly with from Louisville to Portugal? 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.
7.4
United AirlinesOverall score based on 9276 reviews
8.1Crew
7.7Boarding
7.1Entertainment
7.3Comfort
6.6Food
Airline reviews

Both of my flights arrived early and check in process was smooth

10.0 ExcellentDarnell, Feb 2026
COS - DEN
Read more United Airlines reviews

Both of my flights arrived early and check in process was smooth

Terrible. No customer service, no food, no drinks on a 6 hour premier economy booking.

Short flight, but no drink/snack service. The flights both going and coming were delayed.

Much better than Spirit. I was please by the easy fast check in and boarding

Check-in and in-flight staff were better than average. The seat was a fair size but too hard and not enough padding. The cushion/pillow provided is poor (thin and seems to be disposable ,it provides no effective cushioning or support). Food was OK-ish but no choice of inflight snacks and no easy place to get drinks other than water (I could ask for juice by intruding into the staff area at the back of the plane) Entertainment was very good actually. Overall better than I expected from a US-based airline (sorry!) but compared to ANA or Singapore it was so-so. (I live in Japan so they are my comparative airlines)

Everything was on time Will use united again for sure

Plane outlets in my row not working to charge phone. Staff response was, well it should be. Plug into seed for volume not working well. Had to find the sweet spot for plug in or it would shut off and on.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Fine not above and beyond as I had a connection that was delayed due to maintenance

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

The flight was on time/early, attentive crew, and everything overall went smoothly. Disappointed that WIFI was not working for the flight.

One day, I do so hope for a gluten free snack! Seems like with the rest of the world FINALLY figuring out what gluten free is, American Airlines would too. Fingers crossed!!

The flight was significantly delayed for 6.5 hours because of snow. There was no communication once the plane returned to the gate regarding when the flight would resume. Other flights were departing while our flight was being unloaded for reasons unknown. Our flight also seemed out of the queue regarding further deicing, refueling, and waiting to Taxi to the runway.

Flight was on time and the meal and service were good.

The accessible bathroom should be visible to people in Economy class.

Flight was delayed for 2 hours, then last minute the change to on time. The satélite location is far and a nightmare to get to.

This was a horrible experience. I’ve experienced several delays at this point and still not home. I was supposed to be home by 8:30 last night and here I sit at 7 am on a plane STILL unable to go home because of American Airlines.

Lexus in first class was absolutely amazing! Beat flight attendant i’ve ever seen.

Generally good. Flight left on time and the seats are comfortable. Plenty of space in front if you in you choose a comfort plus seat, completely worth spending the extra money given the amount of hours the flight lasts. The food tastes good but I would say it’s a the amount is too little. The crew was friendly and efficient. There was a some turbulence at different points into the flight. American Airlines has good deals to NZ if you book with plenty of time before you plan on going.

the plane was so hot!! the air-conditioning was barely blowing. The flight was delayed, and we had to sit on the hot plane before take off for an extended amount of time, waiting on international passengers. Would not have been so bad if it was not so hot. They said it would get better after take off, but it did not.

Everything you need to know for your flight from Louisville to Portugal

Information on your arrival and departure airports