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Cheap flights from St. Louis to Portugal from $420

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Portugal departing on 5/27. 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 St. Louis to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
8:03 pm - 11:05 pm
STL
-
LIS
21h 02m
2 stops
British Airways Logo
7:20 am - 10:17 pm
LIS
-
STL
20h 57m
2 stops
$603British Airways
Sun, Apr 19 - Sun, Apr 26
British Airways Logo
5:21 pm - 3:35 pm
STL
-
LIS
16h 14m
2 stops
British Airways Logo
11:05 am - 7:31 pm
LIS
-
STL
14h 26m
1 stop
$613British Airways
Fri, May 1 - Sun, May 10
British Airways Logo
5:21 pm - 3:35 pm
STL
-
LIS
16h 14m
2 stops
British Airways Logo
7:20 am - 11:56 pm
LIS
-
STL
22h 36m
2 stops
$625British Airways
Fri, May 1 - Sun, May 10
KLM Logo
6:50 pm - 6:20 pm
STL
-
OPO
17h 30m
2 stops
KLM Logo
11:30 am - 11:36 pm
OPO
-
STL
18h 06m
2 stops
$655KLM
Tue, Apr 21 - Tue, Apr 28
Delta Logo
6:25 am - 8:00 am
STL
-
LIS
19h 35m
1 stop
Delta Logo
11:55 am - 11:36 pm
LIS
-
STL
17h 41m
2 stops
$666Delta
Tue, Apr 14 - Tue, Apr 21
Delta Logo
5:59 pm - 2:55 pm
STL
-
LIS
14h 56m
2 stops
Delta Logo
5:00 am - 11:36 pm
LIS
-
STL
24h 36m
2 stops
$669Delta
Tue, Apr 7 - Tue, Apr 14
American Airlines Logo
6:29 am - 9:05 am
STL
-
LIS
20h 36m
1 stop
American Airlines Logo
1:40 pm - 7:30 pm
LIS
-
STL
35h 50m
1 stop
$681American Airlines
Tue, Apr 21 - Tue, Apr 28
American Airlines Logo
9:10 am - 7:40 am
STL
-
OPO
16h 30m
2 stops
American Airlines Logo
8:20 am - 10:17 pm
OPO
-
STL
19h 57m
2 stops
$709American Airlines
Mon, Apr 20 - Mon, Apr 27
Iberia Logo
12:27 pm - 11:45 am
STL
-
OPO
17h 18m
2 stops
Iberia Logo
8:40 pm - 10:19 pm
OPO
-
STL
31h 39m
2 stops
$776Iberia
Thu, May 7 - Tue, May 12
Iberia Logo
12:27 pm - 11:45 am
STL
-
OPO
17h 18m
2 stops
Iberia Logo
8:40 pm - 7:33 pm
OPO
-
STL
28h 53m
2 stops
$822Iberia
Thu, May 7 - Tue, May 12

Iberia flights from St. Louis to Portugal

Our best Iberia deals on St. Louis to Portugal flight tickets
Iberia
Apr 7
STL6:11 pmLambert-St Louis
23h 14m
2 stops
LIS11:25 pmLisbon Humberto Delgado
Apr 21
LIS8:25 amLisbon Humberto Delgado
19h 54m
2 stops
STL10:19 pmLambert-St Louis
$578
Iberia
Apr 15
STL6:11 pmLambert-St Louis
15h 54m
2 stops
LIS4:05 pmLisbon Humberto Delgado
Apr 21
LIS8:25 amLisbon Humberto Delgado
19h 54m
2 stops
STL10:19 pmLambert-St Louis
$737
Iberia
Apr 19
STL12:27 pmLambert-St Louis
17h 23m
2 stops
LIS11:50 amLisbon Humberto Delgado
Apr 26
LIS12:30 pmLisbon Humberto Delgado
39h 47m
2 stops
STL10:17 pmLambert-St Louis
$738

American Airlines flights from St. Louis to Portugal

Our best American Airlines deals on St. Louis to Portugal flight tickets
American Airlines
Apr 29
STL8:03 pmLambert-St Louis
15h 52m
2 stops
LIS5:55 pmLisbon Humberto Delgado
May 4
LIS7:10 amLisbon Humberto Delgado
18h 23m
2 stops
STL7:33 pmLambert-St Louis
$592
American Airlines
Apr 21
STL6:29 amLambert-St Louis
20h 36m
1 stop
LIS9:05 amLisbon Humberto Delgado
Apr 28
LIS1:40 pmLisbon Humberto Delgado
35h 50m
1 stop
STL7:30 pmLambert-St Louis
$681
American Airlines
Apr 7
STL8:03 pmLambert-St Louis
15h 52m
2 stops
LIS5:55 pmLisbon Humberto Delgado
Apr 14
LIS11:05 amLisbon Humberto Delgado
14h 24m
1 stop
STL7:29 pmLambert-St Louis
$689

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Portugal 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 March 10, 2026.
Use the filters below to find and compare flights from St. Louis to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sun 4/19

8:03 pm-11:05 pm

2 stops21h 02m

Lisbon Humberto Delgado

Sun 4/26

7:20 am-10:17 pm

2 stops20h 57m

$603
Quickest round-trip

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Fri 5/1

5:21 pm-3:35 pm

2 stops16h 14m

Lisbon Humberto Delgado

Sun 5/10

11:05 am-7:31 pm

1 stop14h 26m

$613

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Fri 5/1

5:21 pm-3:35 pm

2 stops16h 14m

Lisbon Humberto Delgado

Sun 5/10

7:20 am-11:56 pm

2 stops22h 36m

$625

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 4/21

6:50 pm-6:20 pm

2 stops17h 30m

Porto

Tue 4/28

11:30 am-11:36 pm

2 stops18h 06m

$655

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 4/14

6:25 am-8:00 am

1 stop19h 35m

Lisbon Humberto Delgado

Tue 4/21

11:55 am-11:36 pm

2 stops17h 41m

$666

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 4/7

5:59 pm-2:55 pm

2 stops14h 56m

Lisbon Humberto Delgado

Tue 4/14

5:00 am-11:36 pm

2 stops24h 36m

$669

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 4/21

6:29 am-9:05 am

1 stop20h 36m

Lisbon Humberto Delgado

Tue 4/28

1:40 pm-7:30 pm

1 stop35h 50m

$681

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 4/20

9:10 am-7:40 am

2 stops16h 30m

Porto

Mon 4/27

8:20 am-10:17 pm

2 stops19h 57m

$709

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Thu 5/7

12:27 pm-11:45 am

2 stops17h 18m

Porto

Tue 5/12

8:40 pm-10:19 pm

2 stops31h 39m

$776

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Thu 5/7

12:27 pm-11:45 am

2 stops17h 18m

Porto

Tue 5/12

8:40 pm-7:33 pm

2 stops28h 53m

$822

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 Portugal from

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

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 month to fly to Portugal?

The cheapest month to fly to Portugal from St. Louis is in April. Flight prices, which tend to average around $592, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of April, then book flights to Portugal from St. Louis during January instead. Flights to Portugal in January, while not as cheap as those in April, still average around $617.

How far in advance should I book a flight to Portugal?

You are more likely to see cheaper flights to Portugal from St. Louis when booking week ahead of your departure date. In general, you can expect to find flights to Portugal for around $1,043 when searching week out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from St. Louis for as low as $700 on momondo.

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

You could potentially save up to 33% on your flight if you consider stops on a St. Louis to Portugal flight.

Cheap St. Louis to Portugal flight deals and tips

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

Fastest flight time

12h 50m

Direct flights

None
The fastest flight from St. Louis to Portugal takes 12h 50m
There are no direct flights from St. Louis to Portugal. There are no popular flight routes from St. Louis to Portugal.
Search flight deals

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

    Prices for flights from Lambert-St Louis Airport to Portugal are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Portugal?

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Portugal.

  • What documentation or ID do you need to fly to Portugal?

    The travel and health documents you'll need for your trip to Portugal may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Portugal. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to Portugal

Compare and see reviews for airlines that fly from St. Louis to Portugal with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $458Free CancellationRating
6.7
7,781 reviews
Search British Airways flights
American AirlinesPriceFrom $460Free CancellationRating
7.1
11,415 reviews
Search American Airlines flights
LufthansaPriceFrom $520Free CancellationRating
6.8
7,841 reviews
Search Lufthansa flights
DeltaPriceFrom $558Free CancellationRating
7.9
8,276 reviews
Search Delta flights
IberiaPriceFrom $571Free CancellationRating
7.0
3,133 reviews
Search Iberia flights
United AirlinesPriceFrom $617Free CancellationRating
7.4
9,413 reviews
Search United Airlines flights
Air CanadaPriceFrom $702Free CancellationRating
7.1
10,800 reviews
Search Air Canada flights

Why use momondo?

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

It is quick and easy to find St. Louis to Portugal flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Portugal that suits you.

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

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

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

Once you have performed a search for St. Louis to Portugal flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from St. Louis to Portugal now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Portugal and let you know when they change.

An easier way to manage your Portugal trip

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Find better results for your trip to Portugal

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Popular flights according to clicks in the last 7 days on momondo
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