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St. Louis

$475+ Cheap flights from Portugal to St. Louis (STL)

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 5/16. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — STL
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
1 adult, Economy
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Cheap flight deals from Portugal to St. Louis

Cheapest flights from Portugal to St. Louis
Explore the most affordable flight options available from Portugal to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 4, 2026.

This United Airlines deal was found by Cheapflights users on 2/2. 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 3/45:00 am
LIS
-
STL
1 stop14h 55m
United Airlines
Sun 3/810:00 am
STL
-
LIS
2 stops17h 10m
United Airlines
Deal found 2/2$864
This United Airlines deal was found by Cheapflights users on 2/3. 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 9/232:25 pm
OPO
-
STL
1 stop34h 16m
United Airlines
Sun 9/279:23 am
STL
-
OPO
2 stops18h 22m
United Airlines
Deal found 2/3$881
This American Airlines deal was found by Cheapflights users on 2/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/411:05 am
LIS
-
STL
1 stop17h 59m
American Airlines
Sun 3/82:19 pm
STL
-
LIS
2 stops16h 31m
American Airlines
Deal found 2/1$912
This Delta deal was found by Cheapflights users on 2/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/45:00 am
OPO
-
STL
2 stops17h 37m
Delta
Wed 2/1111:23 am
STL
-
OPO
2 stops17h 07m
Delta
Deal found 2/3$989
This Trip.com deal was found by Cheapflights users on 2/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/206:00 am
OPO
-
STL
1 stop13h 55m
Lufthansa
Fri 3/274:50 pm
STL
-
OPO
1 stop24h 35m
Lufthansa
Deal found 2/3$1,107
This Mytrip deal was found by Cheapflights users on 2/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/109:00 am
OPO
-
STL
1 stop20h 27m
Multiple Airlines
Mon 8/1712:10 pm
STL
-
OPO
1 stop12h 40m
Multiple Airlines
Deal found 2/2$1,294

Find flight deals from Portugal to St. Louis

Keep the following information in mind while searching for Portugal to St. Louis flight deals. Data was last updated February 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$837
(Kiwi.com)

One-way from

$475
(Kiwi.com)

Popular in

September

Cheapest in

December
Provider with most accurate pricing for Lisbon Humberto Delgado-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lisbon Humberto Delgado-Lambert-St Louis flights.
Search Deals
From Portugal to Lambert-St Louis
Search Deals
One-way flight from Portugal to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($110 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portugal to St. Louis 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 February 4, 2026.
Use the filters below to find and compare flights from Portugal to St. Louis that are best for you.

Fly from

Portugal

Fly to

St. Louis

Route

Depart

Return

Price

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 3/4

5:00 am-1:55 pm

1 stop14h 55m

Lambert-St Louis

Sun 3/8

10:00 am-8:10 am

2 stops17h 10m

$864

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 3/4

8:20 am-6:00 pm

2 stops15h 40m

Lambert-St Louis

Sun 3/8

7:00 am-9:05 am

2 stops21h 05m

$897

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Fri 3/20

6:00 am-2:55 pm

1 stop13h 55m

Lambert-St Louis

Fri 3/27

4:50 pm-10:25 pm

1 stop24h 35m

$1,107

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sat 5/16

6:05 am-6:50 am

3 stops54h 45m

$475

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sun 4/19

10:20 pm-11:19 pm

3 stops54h 59m

$483

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Mon 5/4

10:25 am-6:50 am

2 stops50h 25m

$549

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sun 4/19

6:35 am-10:17 pm

2 stops21h 42m

$558

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 5/28

6:35 am-11:23 pm

2 stops22h 48m

$564

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 5/28

9:25 am-9:14 pm

3 stops41h 49m

$565

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 5/28

11:05 am-5:03 pm

1 stop11h 58m

$569

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/2

Showing 1-10 of 12 results
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Best time to book a flight from Portugal to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Portugal 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 Portugal to St. Louis
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Portugal to St. Louis. 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 into for flights to St. Louis from Portugal?

    Lambert-St Louis (STL) is the airport you will fly into if you book a flight from Portugal to St. Louis. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.

  • How long is the flight from Portugal to St. Louis?

    Departing from Portugal to St. Louis will take you 13h 55m. Airlines will cover a distance of 4154 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Portugal to St. Louis that include hotel bookings?

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

  • How can I find direct flights from Portugal to St. Louis?

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

  • Can I find deals for business class flights from Portugal to St. Louis?

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

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

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