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Portugal

$393+ Cheap flights from Louisville (SDF) to Portugal

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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — LIS
Jul 18 — Jul 251
Sat 7/18
Sat 7/25
1 adult, Economy
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Cheap flight deals from Louisville to Portugal

Cheapest flights from Louisville to Portugal
Explore the most affordable flight options available from Louisville to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 18, 2026.

This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/177:10 am
SDF
-
LIS
2 stops22h 20m
United Airlines
Tue 9/2911:25 am
LIS
-
SDF
2 stops32h 14m
United Airlines
Deal found 6/14$904
This United deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:00 am
SDF
-
LIS
1 stop23h 30m
Multiple Airlines
Tue 9/2911:25 am
LIS
-
SDF
2 stops30h 50m
Multiple Airlines
Deal found 6/14$906
This United Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:15 am
SDF
-
LIS
1 stop21h 05m
United Airlines
Wed 9/911:25 am
LIS
-
SDF
2 stops36h 42m
United Airlines
Deal found 6/13$937
This United Airlines deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/110:43 am
SDF
-
LIS
1 stop16h 37m
United Airlines
Tue 9/811:25 am
LIS
-
SDF
2 stops32h 12m
United Airlines
Deal found 6/17$938
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/1510:05 am
SDF
-
LIS
1 stop19h 25m
United Airlines
Wed 7/2212:55 pm
LIS
-
SDF
2 stops40h 04m
United Airlines
Deal found 6/14$942
This United Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/156:00 am
SDF
-
LIS
1 stop23h 30m
United Airlines
Tue 7/2111:25 am
LIS
-
SDF
2 stops38h 00m
United Airlines
Deal found 6/16$943
This United Airlines deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/306:00 am
SDF
-
LIS
1 stop23h 30m
United Airlines
Wed 9/91:00 pm
LIS
-
SDF
2 stops35h 07m
United Airlines
Deal found 6/17$944
This Air Canada deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/295:45 pm
SDF
-
LIS
2 stops34h 35m
Air Canada
Fri 9/1111:25 am
LIS
-
SDF
2 stops30h 46m
Air Canada
Deal found 6/17$946
This United Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/210:05 am
SDF
-
LIS
1 stop19h 25m
United Airlines
Wed 8/126:45 am
LIS
-
SDF
2 stops17h 22m
United Airlines
Deal found 6/16$948
This FlightHub deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/211:00 am
SDF
-
LIS
2 stops17h 20m
Multiple Airlines
Wed 9/95:05 am
LIS
-
SDF
2 stops22h 54m
Multiple Airlines
Deal found 6/13$949

Find flight deals from Louisville to Portugal

Keep the following information in mind while searching for Louisville to Portugal flight deals. Data was last updated June 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$904
(United Airlines)

One-way from

$393
(Kiwi.com)

Popular in

June

Cheapest in

April

Average price

$1,334
Provider with most accurate pricing for Louisville Intl-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Louisville Intl-Lisbon Humberto Delgado flights.
Search Deals
From Louisville Intl to Portugal
Search Deals
One-way flight from Louisville Intl to Portugal
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($287 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Louisville to Portugal 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 2,558,603 searches. Data last updated June 18, 2026.
Use the filters below to find and compare flights from Louisville to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Wed 9/2

6:15 am-8:20 am

1 stop21h 05m

Lisbon Humberto Delgado

Wed 9/9

11:25 am-7:07 pm

2 stops36h 42m

$937

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Tue 9/8

5:15 am-9:20 am

2 stops23h 05m

Lisbon Humberto Delgado

Thu 9/17

11:25 am-5:39 pm

2 stops35h 14m

$941

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Wed 7/15

10:05 am-10:30 am

1 stop19h 25m

Lisbon Humberto Delgado

Wed 7/22

12:55 pm-11:59 pm

2 stops40h 04m

$942

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Wed 7/15

6:00 am-10:30 am

1 stop23h 30m

Lisbon Humberto Delgado

Tue 7/21

11:25 am-8:25 pm

2 stops38h 00m

$943
Quickest round-trip

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Sun 8/2

10:05 am-10:30 am

1 stop19h 25m

Lisbon Humberto Delgado

Wed 8/12

6:45 am-7:07 pm

2 stops17h 22m

$948

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Mon 7/13

1:08 pm-8:20 am

1 stop14h 12m

Lisbon Humberto Delgado

Mon 7/20

1:00 pm-2:37 pm

2 stops30h 37m

$1,012

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Fri 7/31

10:04 am-10:30 am

2 stops19h 26m

Lisbon Humberto Delgado

Thu 8/6

5:05 am-8:23 pm

2 stops20h 18m

$1,013
Cheapest one-way

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Sun 10/4

6:00 am-8:20 am

2 stops21h 20m

$395

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Sat 10/3

7:00 am-9:20 am

2 stops45h 20m

$410

LouisvilleLisbon

SDF - LIS

SDFLIS

Louisville Intl

Sat 10/3

7:30 am-9:05 am

1 stop20h 35m

$455

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/15

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

Best time to book a flight from Louisville to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal from Louisville with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from Louisville to Portugal?

Currently, December is the cheapest month in which you can book a flight from Louisville to Portugal (average of $449). Flying from Louisville to Portugal in June is currently the most expensive (average of $1,052). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. 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 Portugal. Reviews last updated June 18, 2026.
Peruse reviews from past customers who have flown with Delta,United Airlines, andAmerican Airlines from Louisville to Portugal to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,410 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

7.8

Food

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.8
Good
8,410 reviews
Delta
7.8
Good
8,410 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

7.8

Food

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
9,859 reviews
Delta
7.8
Good
8,410 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

7.8

Food

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
American Airlines
7.1
Good
11,686 reviews
Delta
7.8
Good
8,410 reviews

Entertainment

7.8

Crew

8.5

Comfort

7.8

Boarding

8.1

Overall

7.8

Food

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

Related info for your journey

Find useful and relevant information for your journey from Louisville to Portugal. 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 Louisville to Portugal?

    Most people fly from Louisville Intl (SDF) if they book a flight from Louisville to Portugal. Louisville Intl is conveniently located just 5.3 mi from Louisville’s city center.

  • How long is the flight from Louisville to Portugal?

    There are many flights that can get you from Louisville to Portugal in 21h 05m. Fly via United Airlines to get the fastest option. Airlines will cover a distance of 4008 mi.

  • Can I find deals for flights from Louisville to Portugal that include hotel bookings?

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

  • How can I find direct flights from Louisville to Portugal?

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

  • Can I find deals for business class flights from Louisville to Portugal?

    Yes. Cheapflights offers flight deals from Louisville to Portugal by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Louisville to Portugal?

    Currently, December is the cheapest month in which you can book a flight from Louisville to Portugal (average of $449). Flying from Louisville to Portugal in June is currently the most expensive (average of $1,052). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Louisville to Portugal

Discover the top 3 airlines that operate flights from Louisville to Portugal. 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 2,558,603 searches. Data last updated June 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$543Average$958FlexibilityNo cancel feeOn-time69%
DeltaCheapest$587Average$1,187FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$606Average$900FlexibilityNo cancel feeOn-time71%

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