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Cheap flights from Portugal to St. Louis from $507

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portugal to St. Louis departing on 5/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Portugal to St. Louis

Recent round-trip flight deals from Portugal to St. Louis

Enter your travel dates to find the best prices.
Lufthansa Logo
6:00 am - 7:27 pm
OPO
-
STL
19h 27m
2 stops
Lufthansa Logo
12:22 pm - 6:15 am
STL
-
OPO
11h 53m
1 stop
$945Lufthansa
Tue, May 19 - Tue, May 26
Lufthansa Logo
6:00 am - 7:27 pm
OPO
-
STL
19h 27m
2 stops
Lufthansa Logo
12:22 pm - 11:10 am
STL
-
OPO
16h 48m
2 stops
$950Lufthansa
Tue, May 19 - Tue, May 26
Delta Logo
5:00 am - 8:44 pm
LIS
-
STL
21h 44m
2 stops
Delta Logo
12:23 pm - 2:55 pm
STL
-
LIS
20h 32m
2 stops
$955Delta
Fri, Apr 17 - Tue, Apr 21
Lufthansa Logo
4:35 pm - 1:25 pm
OPO
-
STL
26h 50m
1 stop
Lufthansa Logo
12:22 pm - 9:45 am
STL
-
OPO
15h 23m
1 stop
$960Lufthansa
Tue, May 19 - Tue, May 26
United Airlines Logo
5:05 am - 1:25 pm
LIS
-
STL
14h 20m
1 stop
United Airlines Logo
6:15 am - 8:20 am
STL
-
LIS
20h 05m
1 stop
$961United Airlines
Fri, Apr 17 - Tue, Apr 21
Lufthansa Logo
5:05 am - 1:25 pm
LIS
-
STL
14h 20m
1 stop
Lufthansa Logo
1:10 pm - 11:45 am
STL
-
LIS
16h 35m
2 stops
$965Lufthansa
Fri, Apr 17 - Tue, Apr 21
United Airlines Logo
7:25 am - 1:25 pm
LIS
-
STL
36h 00m
1 stop
United Airlines Logo
8:30 am - 10:30 am
STL
-
LIS
20h 00m
1 stop
$966United Airlines
Thu, Apr 23 - Sun, Apr 26
American Airlines Logo
8:25 am - 11:46 pm
LIS
-
STL
21h 21m
2 stops
American Airlines Logo
8:03 pm - 5:45 pm
STL
-
LIS
15h 42m
2 stops
$967American Airlines
Thu, Apr 23 - Sun, Apr 26
American Airlines Logo
8:25 am - 10:17 pm
LIS
-
STL
19h 52m
2 stops
American Airlines Logo
8:03 pm - 5:45 pm
STL
-
LIS
15h 42m
2 stops
$974American Airlines
Thu, Apr 23 - Sun, Apr 26
Multiple Airlines Logo
10:00 am - 8:09 pm
OPO
-
STL
16h 09m
2 stops
Multiple Airlines Logo
1:05 pm - 12:40 am
STL
-
OPO
29h 35m
3 stops
$1,810Multiple Airlines
Tue, May 19 - Tue, May 26

United Airlines flights from Portugal to St. Louis

Our best United Airlines deals on Portugal to St. Louis flight tickets
United Airlines
Apr 24
LIS5:05 amLisbon Humberto Delgado
14h 20m
1 stop
STL1:25 pmLambert-St Louis
Apr 29
STL6:15 amLambert-St Louis
20h 05m
1 stop
LIS8:20 amLisbon Humberto Delgado
$947
United Airlines
Apr 24
LIS5:05 amLisbon Humberto Delgado
14h 20m
1 stop
STL1:25 pmLambert-St Louis
Apr 29
STL9:10 amLambert-St Louis
17h 10m
2 stops
LIS8:20 amLisbon Humberto Delgado
$965
United Airlines
Apr 23
LIS7:25 amLisbon Humberto Delgado
36h 00m
1 stop
STL1:25 pmLambert-St Louis
Apr 26
STL8:30 amLambert-St Louis
20h 00m
1 stop
LIS10:30 amLisbon Humberto Delgado
$966

American Airlines flights from Portugal to St. Louis

Our best American Airlines deals on Portugal to St. Louis flight tickets
American Airlines
Apr 23
LIS8:25 amLisbon Humberto Delgado
21h 21m
2 stops
STL11:46 pmLambert-St Louis
Apr 26
STL8:03 pmLambert-St Louis
15h 42m
2 stops
LIS5:45 pmLisbon Humberto Delgado
$967
American Airlines
Apr 23
LIS8:25 amLisbon Humberto Delgado
19h 52m
2 stops
STL10:17 pmLambert-St Louis
Apr 26
STL8:03 pmLambert-St Louis
15h 42m
2 stops
LIS5:45 pmLisbon Humberto Delgado
$974
American Airlines
Apr 23
LIS8:25 amLisbon Humberto Delgado
17h 08m
2 stops
STL7:33 pmLambert-St Louis
Apr 26
STL1:29 pmLambert-St Louis
13h 36m
1 stop
LIS9:05 amLisbon Humberto Delgado
$977

momondo 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, momondo users made 832,500 searches. Data last updated April 5, 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

Tue 5/19

6:00 am-7:27 pm

2 stops19h 27m

Lambert-St Louis

Tue 5/26

12:22 pm-6:15 am

1 stop11h 53m

$945

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Tue 5/19

6:00 am-7:27 pm

2 stops19h 27m

Lambert-St Louis

Tue 5/26

12:22 pm-11:10 am

2 stops16h 48m

$950

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 4/17

5:00 am-8:44 pm

2 stops21h 44m

Lambert-St Louis

Tue 4/21

12:23 pm-2:55 pm

2 stops20h 32m

$955

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Tue 5/19

4:35 pm-1:25 pm

1 stop26h 50m

Lambert-St Louis

Tue 5/26

12:22 pm-9:45 am

1 stop15h 23m

$960

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 4/17

5:05 am-1:25 pm

1 stop14h 20m

Lambert-St Louis

Tue 4/21

6:15 am-8:20 am

1 stop20h 05m

$961
Quickest round-trip

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 4/17

5:05 am-1:25 pm

1 stop14h 20m

Lambert-St Louis

Tue 4/21

1:10 pm-11:45 am

2 stops16h 35m

$965

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

8:30 am-10:30 am

1 stop20h 00m

$966

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 4/23

8:25 am-11:46 pm

2 stops21h 21m

Lambert-St Louis

Sun 4/26

8:03 pm-5:45 pm

2 stops15h 42m

$967

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 4/23

8:25 am-10:17 pm

2 stops19h 52m

Lambert-St Louis

Sun 4/26

8:03 pm-5:45 pm

2 stops15h 42m

$974

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Tue 5/19

10:00 am-8:09 pm

2 stops16h 09m

Lambert-St Louis

Tue 5/26

1:05 pm-12:40 am

3 stops29h 35m

$1,810

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Portugal to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Can stopping save me money on Portugal to St. Louis flights?

You could potentially save up to 5% on your flight if you consider stops on a Portugal to St. Louis flight.

Cheap Portugal to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portugal to St. Louis

Fastest flight time

16h 09m

Direct flights

None
The fastest flight from Portugal to St. Louis takes 16h 09m
There are no direct flights from Portugal to St. Louis. There are no popular flight routes from Portugal to St. Louis.
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Frequently asked questions about flying from Portugal to St. Louis

  • When did momondo last update prices for flights from Portugal to Lambert-St Louis Airport?

    Prices for flights from Portugal to Lambert-St Louis Airport are updated daily.

  • How old do you have to be to fly from Portugal to Lambert-St Louis Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portugal to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
St. Peters
Collinsville
Alton
Wentzville
Fenton
Farmington
Clayton
Festus
Eureka
Edwardsville
Litchfield
Shrewsbury
Grafton

Why use momondo?

Why should I use momondo to find a flight deal from Portugal to St. Louis?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Portugal to St. Louis. momondo saves you time and could save you money on your trip.

Can I find flights from Portugal to St. Louis with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Portugal to St. Louis flights to just show those with flexible booking policies.

How can momondo help me find flights from Portugal to St. Louis?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from Portugal.

I’m not ready to book a flight from Portugal to St. Louis right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to St. Louis from Portugal. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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