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St. Louis

$420+ 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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — STL
Jul 25 — Aug 11
Sat 7/25
Sat 8/1
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 June 25, 2026.

This American Airlines deal was found by Cheapflights users on 6/24. 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 12/28:20 am
OPO
-
STL
2 stops36h 04m
American Airlines
Sat 12/56:53 pm
STL
-
OPO
2 stops34h 52m
American Airlines
Deal found 6/24$828
This Mytrip deal was found by Cheapflights users on 6/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:10 am
LIS
-
STL
2 stops20h 14m
Multiple Airlines
Tue 8/252:40 pm
STL
-
LIS
3 stops25h 05m
Multiple Airlines
Deal found 6/25$962
This United Airlines deal was found by Cheapflights users on 6/24. 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 12/26:00 am
OPO
-
STL
1 stop13h 45m
United Airlines
Sat 12/57:30 am
STL
-
OPO
1 stop20h 00m
United Airlines
Deal found 6/24$1,017
This United Airlines deal was found by Cheapflights users on 6/24. 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 12/25:00 am
LIS
-
STL
1 stop14h 45m
United Airlines
Sat 12/59:40 am
STL
-
LIS
2 stops16h 30m
United Airlines
Deal found 6/24$1,025
This Flighttix deal was found by Cheapflights users on 6/22. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/238:25 am
LIS
-
STL
2 stops18h 30m
Iberia
Mon 7/276:43 am
STL
-
LIS
2 stops20h 22m
Iberia
Deal found 6/22$1,072
This Delta deal was found by Cheapflights users on 6/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/95:00 am
OPO
-
STL
2 stops18h 24m
Delta
Mon 7/131:54 pm
STL
-
OPO
2 stops19h 31m
Delta
Deal found 6/24$1,072
This Mytrip deal was found by Cheapflights users on 6/20. 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 7/610:30 pm
OPO
-
STL
2 stops27h 37m
Multiple Airlines
Fri 7/102:40 pm
STL
-
OPO
2 stops24h 45m
Multiple Airlines
Deal found 6/20$1,151
This Mytrip deal was found by Cheapflights users on 6/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/91:30 pm
OPO
-
STL
3 stops35h 12m
Multiple Airlines
Mon 7/138:55 am
STL
-
OPO
3 stops31h 20m
Multiple Airlines
Deal found 6/24$1,232

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 June 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$828
(American Airlines)

One-way from

$420
(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 June 25, 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

Wed 12/2

8:20 am-2:24 pm

2 stops36h 04m

Lambert-St Louis

Sat 12/5

6:53 pm-11:45 am

2 stops34h 52m

$828

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 12/2

6:00 am-1:45 pm

1 stop13h 45m

Lambert-St Louis

Sat 12/5

8:50 am-9:30 am

2 stops18h 40m

$1,017
Quickest round-trip

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 12/2

5:00 am-1:45 pm

1 stop14h 45m

Lambert-St Louis

Sat 12/5

9:40 am-8:10 am

2 stops16h 30m

$1,025
Cheapest one-way

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 9/24

7:15 am-9:40 am

3 stops56h 25m

$420

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Tue 9/29

9:40 pm-7:39 pm

3 stops51h 59m

$504

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 9/24

12:25 pm-8:20 am

2 stops25h 55m

$527

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sun 11/1

8:45 pm-11:56 pm

2 stops33h 11m

$545

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sun 11/1

10:55 am-9:40 am

3 stops52h 45m

$599

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Mon 8/24

9:25 pm-7:30 pm

1 stop28h 05m

$812

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 8/19

11:05 am-11:34 pm

1 stop18h 29m

$887

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/25

Showing 1-10 of 15 resultsSorted by cheapest first
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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 45m. 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
Fenton
Swansea
Fairview Heights
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Alton
Farmington

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