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Cheap flights from Portugal to St. Louis from $429

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 2/6. 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
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.
American Airlines Logo
8:20 am - 10:20 am
LIS
-
STL
32h 00m2 stops
American Airlines Logo
1:35 pm - 2:55 pm
STL
-
LIS
19h 20m2 stops
$720American Airlines
Thu, Jan 29 - Mon, Feb 2
American Airlines Logo
11:05 am - 9:24 am
LIS
-
STL
28h 19m2 stops
American Airlines Logo
2:54 pm - 9:45 pm
STL
-
LIS
24h 51m2 stops
$722American Airlines
Mon, Jan 12 - Sun, Jan 18
Scandinavian Airlines Logo
7:00 pm - 11:37 pm
LIS
-
STL
34h 37m2 stops
Scandinavian Airlines Logo
1:00 pm - 8:55 am
STL
-
LIS
37h 55m2 stops
$729Scandinavian Airlines
Sun, Feb 1 - Sat, Feb 7
British Airways Logo
7:00 am - 10:44 pm
LIS
-
STL
21h 44m2 stops
British Airways Logo
3:54 pm - 10:25 pm
STL
-
LIS
24h 31m2 stops
$733British Airways
Sat, Jan 31 - Fri, Feb 6
Multiple Airlines Logo
11:05 am - 10:44 pm
LIS
-
STL
17h 39m1 stop
Multiple Airlines Logo
9:33 am - 9:05 am
STL
-
LIS
17h 32m1 stop
$735Multiple Airlines
Mon, Jan 12 - Sun, Jan 18
American Airlines Logo
7:45 am - 6:14 pm
LIS
-
STL
16h 29m2 stops
American Airlines Logo
9:33 am - 9:05 am
STL
-
LIS
17h 32m1 stop
$743American Airlines
Sun, Feb 1 - Sat, Feb 7
Iberia Logo
7:45 am - 6:14 pm
LIS
-
STL
16h 29m2 stops
Iberia Logo
2:54 pm - 11:50 am
STL
-
LIS
38h 56m2 stops
$806Iberia
Sun, Feb 1 - Fri, Feb 6
Lufthansa Logo
5:00 am - 11:59 pm
LIS
-
STL
24h 59m2 stops
Lufthansa Logo
11:22 am - 8:10 am
STL
-
LIS
14h 48m1 stop
$860Lufthansa
Sat, Jan 31 - Sun, Feb 8
Lufthansa Logo
5:00 am - 11:59 pm
LIS
-
STL
24h 59m2 stops
Lufthansa Logo
11:22 am - 8:10 am
STL
-
LIS
14h 48m1 stop
$878Lufthansa
Sat, Jan 31 - Sat, Feb 7
United Airlines Logo
10:15 am - 5:18 pm
LIS
-
STL
13h 03m1 stop
United Airlines Logo
11:20 am - 8:10 am
STL
-
LIS
14h 50m2 stops
$887United Airlines
Thu, Jan 29 - Mon, Feb 2

American Airlines flights from Portugal to St. Louis

Our best American Airlines deals on Portugal to St. Louis flight tickets
American Airlines
Jan 29
LIS8:20 amLisbon Humberto Delgado
32h 00m
2 stops
STL10:20 amLambert-St Louis
Feb 2
STL1:35 pmLambert-St Louis
19h 20m
2 stops
LIS2:55 pmLisbon Humberto Delgado
$720
Find similar
American Airlines
Jan 12
LIS11:05 amLisbon Humberto Delgado
17h 39m
1 stop
STL10:44 pmLambert-St Louis
Jan 18
STL2:54 pmLambert-St Louis
15h 11m
2 stops
LIS12:05 pmLisbon Humberto Delgado
$722
Find similar
American Airlines
Feb 1
LIS7:45 amLisbon Humberto Delgado
16h 29m
2 stops
STL6:14 pmLambert-St Louis
Feb 7
STL9:33 amLambert-St Louis
17h 32m
1 stop
LIS9:05 amLisbon Humberto Delgado
$743
Find similar

British Airways flights from Portugal to St. Louis

Our best British Airways deals on Portugal to St. Louis flight tickets
British Airways
Jan 31
LIS7:00 amLisbon Humberto Delgado
21h 44m
2 stops
STL10:44 pmLambert-St Louis
Feb 6
STL3:54 pmLambert-St Louis
24h 31m
2 stops
LIS10:25 pmLisbon Humberto Delgado
$733
Find similar
British Airways
Jan 7
LIS11:05 amLisbon Humberto Delgado
17h 39m
1 stop
STL10:44 pmLambert-St Louis
Jan 17
STL1:40 pmLambert-St Louis
16h 30m
2 stops
LIS12:10 pmLisbon Humberto Delgado
$1,109
Find similar
British Airways
Jan 7
LIS7:05 amLisbon Humberto Delgado
20h 10m
2 stops
STL9:15 pmLambert-St Louis
Jan 17
STL1:40 pmLambert-St Louis
16h 30m
2 stops
LIS12:10 pmLisbon Humberto Delgado
$1,119
Find similar

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 December 22, 2025.
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

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 1/29

8:20 am-10:20 am

2 stops32h 00m

Lambert-St Louis

Mon 2/2

1:35 pm-2:55 pm

2 stops19h 20m

$720

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Mon 1/12

11:05 am-9:24 am

2 stops28h 19m

Lambert-St Louis

Sun 1/18

2:54 pm-9:45 pm

2 stops24h 51m

$722

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sun 2/1

7:00 pm-11:37 pm

2 stops34h 37m

Lambert-St Louis

Sat 2/7

1:00 pm-8:55 am

2 stops37h 55m

$729

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sat 1/31

7:00 am-10:44 pm

2 stops21h 44m

Lambert-St Louis

Fri 2/6

3:54 pm-10:25 pm

2 stops24h 31m

$733

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Mon 1/12

11:05 am-10:44 pm

1 stop17h 39m

Lambert-St Louis

Sun 1/18

9:33 am-9:05 am

1 stop17h 32m

$735

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sun 2/1

7:45 am-6:14 pm

2 stops16h 29m

Lambert-St Louis

Sat 2/7

9:33 am-9:05 am

1 stop17h 32m

$743

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sun 2/1

7:45 am-6:14 pm

2 stops16h 29m

Lambert-St Louis

Fri 2/6

2:54 pm-11:50 am

2 stops38h 56m

$806

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sat 1/31

5:00 am-11:59 pm

2 stops24h 59m

Lambert-St Louis

Sun 2/8

11:22 am-8:10 am

1 stop14h 48m

$860

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sat 1/31

5:00 am-11:59 pm

2 stops24h 59m

Lambert-St Louis

Sat 2/7

11:22 am-8:10 am

1 stop14h 48m

$878

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 1/29

10:15 am-5:18 pm

1 stop13h 03m

Lambert-St Louis

Mon 2/2

11:20 am-8:10 am

2 stops14h 50m

$887

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 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

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Monday when prices can be found for as low as $898. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $1,021. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

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

You could potentially save up to 41% 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

13h 55m

Direct flights

None
The fastest flight from Portugal to St. Louis takes 13h 55m
There are no direct flights from Portugal to St. Louis. There are no popular flight routes from Portugal to St. Louis.
Search flight deals

  • 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
Fenton
St. Peters
Wentzville
Collinsville
Alton
Farmington
Clayton
Festus
Glencoe
Eureka
Edwardsville
Litchfield
Shrewsbury

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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