HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$442+ 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 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — STL
Apr 28 — May 51
Tue 4/28
Tue 5/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portugal to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 March 29, 2026.

This United Airlines deal was found by Cheapflights users on 3/25. 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.
Fri 4/106:00 am
OPO
-
STL
2 stops34h 56m
United Airlines
Tue 4/1411:15 am
STL
-
OPO
2 stops16h 30m
United Airlines
Deal found 3/25$927
This Delta deal was found by Cheapflights users on 3/25. 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 4/225:00 am
LIS
-
STL
2 stops21h 44m
Delta
Wed 4/295:59 pm
STL
-
LIS
2 stops18h 46m
Delta
Deal found 3/25$946
This Delta deal was found by Cheapflights users on 3/27. 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.
Fri 5/15:00 am
LIS
-
STL
2 stops24h 13m
Delta
Tue 5/51:46 pm
STL
-
LIS
2 stops19h 09m
Delta
Deal found 3/27$947
This United Airlines deal was found by Cheapflights users on 3/27. 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.
Fri 5/15:05 am
LIS
-
STL
1 stop14h 20m
United Airlines
Tue 5/58:45 am
STL
-
LIS
1 stop19h 45m
United Airlines
Deal found 3/27$949
This United Airlines deal was found by Cheapflights users on 3/24. 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 4/237:25 am
LIS
-
STL
1 stop36h 00m
United Airlines
Sun 4/268:30 am
STL
-
LIS
1 stop20h 00m
United Airlines
Deal found 3/24$950
This American Airlines deal was found by Cheapflights users on 3/24. 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.
Thu 4/2311:05 am
LIS
-
STL
1 stop14h 24m
American Airlines
Sun 4/268:03 pm
STL
-
LIS
2 stops15h 42m
American Airlines
Deal found 3/24$951
This Gotogate deal was found by Cheapflights users on 3/26. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:05 am
LIS
-
STL
1 stop14h 20m
Lufthansa
Mon 9/288:25 am
STL
-
LIS
1 stop20h 05m
Lufthansa
Deal found 3/26$952
This Expedia deal was found by Cheapflights users on 3/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:05 am
LIS
-
STL
1 stop14h 20m
Lufthansa
Sat 5/97:11 pm
STL
-
LIS
2 stops21h 04m
Lufthansa
Deal found 3/26$961
This American Airlines deal was found by Cheapflights users on 3/26. 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.
Fri 5/111:05 am
LIS
-
STL
1 stop14h 24m
American Airlines
Sat 5/96:29 am
STL
-
LIS
1 stop20h 36m
American Airlines
Deal found 3/26$970
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/227:20 am
LIS
-
STL
1 stop18h 10m
American Airlines
Wed 4/299:35 pm
STL
-
LIS
1 stop14h 20m
American Airlines
Deal found 3/25$974
This United Airlines deal was found by Cheapflights users on 3/24. 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 6/39:00 am
OPO
-
STL
2 stops16h 23m
United Airlines
Sun 6/71:05 pm
STL
-
OPO
1 stop11h 45m
United Airlines
Deal found 3/24$1,000
This American Airlines deal was found by Cheapflights users on 3/24. 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 6/38:20 am
OPO
-
STL
2 stops38h 39m
American Airlines
Sun 6/75:14 am
STL
-
OPO
2 stops20h 26m
American Airlines
Deal found 3/24$1,071

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 March 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$927
(United Airlines)

One-way from

$442
(Kiwi.com)
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

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 March 29, 2026.
Use the filters below to find and compare flights from Portugal to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Fri 4/10

6:00 am-11:57 pm

2 stops23h 57m

Lambert-St Louis

Tue 4/14

6:15 am-9:45 am

1 stop21h 30m

$927

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 5/1

5:00 am-11:13 pm

2 stops24h 13m

Lambert-St Louis

Tue 5/5

1:46 pm-2:55 pm

2 stops19h 09m

$946

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 4/23

8:25 am-11:47 am

2 stops33h 22m

Lambert-St Louis

Sun 4/26

4:30 pm-5:45 pm

2 stops19h 15m

$947

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 5/1

5:05 am-1:25 pm

1 stop14h 20m

Lambert-St Louis

Tue 5/5

8:45 am-10:30 am

1 stop19h 45m

$947

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 4/23

7:25 am-1:25 pm

1 stop36h 00m

Lambert-St Louis

Sun 4/26

12:15 pm-10:30 am

1 stop16h 15m

$949

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 5/1

5:00 am-11:13 pm

2 stops24h 13m

Lambert-St Louis

Sat 5/9

11:25 am-11:15 am

2 stops17h 50m

$951
Quickest round-trip

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 6/3

9:00 am-4:07 pm

1 stop13h 07m

Lambert-St Louis

Sun 6/7

1:05 pm-6:50 am

1 stop11h 45m

$1,000

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 6/3

8:20 am-4:59 pm

2 stops38h 39m

Lambert-St Louis

Sun 6/7

5:14 am-7:40 am

2 stops20h 26m

$1,071

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sat 5/9

8:40 pm-10:19 pm

2 stops31h 39m

Lambert-St Louis

Sat 5/16

11:45 am-4:00 pm

2 stops22h 15m

$1,153
Cheapest one-way

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 5/27

6:10 am-12:21 am

2 stops24h 11m

$442

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 14h 24m. Airlines will cover a distance of 4212 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
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.