What airlines fly to Portugal?

United Airlines, Air Canada and American Airlines are the top three most popular airlines that fly to Portugal from St. Louis according to our data. United Airlines is the first choice among our users, with 44% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 6 different airlines that fly to Portugal on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Lambert-St Louis to Portugal?

Aer Lingus, American Airlines, and Air Canada are the most popular carriers operating from Lambert-St Louis to Portugal

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?

The number of operators available for flights from Lambert-St Louis Airport to Portugal is 6 as of January 2026.

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.

$354 Cheap Flights from St. Louis to Portugal in 2026

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Cheap round-trip flights

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3:50 pm - 11:35 am

STL

LIS

13h 45m

1 stop

5:00 am - 11:51 pm

LIS

STL

23h 51m

2 stops

$455Lufthansa

mié., mar. 4 - mié., mar. 11

8:30 am - 10:15 am

STL

LIS

19h 45m

1 stop

11:55 am - 8:23 pm

LIS

STL

14h 28m

1 stop

$457United Airlines

mar., feb. 24 - mar., mar. 3

3:50 pm - 11:35 am

STL

LIS

13h 45m

1 stop

5:00 am - 2:55 pm

LIS

STL

14h 55m

1 stop

$460Lufthansa

mié., mar. 4 - mié., mar. 11

8:13 am - 7:40 am

STL

OPO

17h 27m

2 stops

8:20 am - 11:48 pm

OPO

STL

21h 28m

2 stops

$461American Airlines

dom., feb. 1 - jue., feb. 12

11:25 am - 10:15 am

STL

LIS

16h 50m

2 stops

10:15 am - 5:00 pm

LIS

STL

12h 45m

1 stop

$462United Airlines

mar., feb. 24 - mar., mar. 3

1:00 pm - 11:00 am

STL

LIS

40h 00m

2 stops

5:05 am - 1:25 pm

LIS

STL

14h 20m

1 stop

$467Multiple Airlines

sáb., may. 2 - dom., may. 10

6:15 am - 8:20 am

STL

LIS

20h 05m

1 stop

11:25 am - 8:05 pm

LIS

STL

14h 40m

1 stop

$472United Airlines

lun., abr. 27 - mar., may. 5

11:22 am - 11:45 am

STL

OPO

18h 23m

2 stops

8:20 am - 11:48 pm

OPO

STL

20h 28m

2 stops

$486American Airlines

jue., mar. 5 - jue., mar. 12

9:33 am - 8:00 pm

STL

OPO

28h 27m

2 stops

4:40 pm - 11:22 pm

OPO

STL

36h 42m

2 stops

$592Iberia

mié., feb. 11 - lun., feb. 16

12:28 pm - 10:30 am

STL

OPO

17h 02m

2 stops

5:00 am - 11:58 pm

OPO

STL

23h 58m

2 stops

$593Delta

mié., mar. 18 - mié., mar. 25

Lufthansa flights from St. Louis to Portugal

Our best Lufthansa deals on St. Louis to Portugal flight tickets

Lufthansa

Mar 4

STL3:50 pmLambert-St Louis

13h 45m

1 stop

LIS11:35 amLisbon Humberto Delgado

Mar 11

LIS5:00 amLisbon Humberto Delgado

23h 51m

2 stops

STL11:51 pmLambert-St Louis

$455

Lufthansa

Mar 4

STL3:50 pmLambert-St Louis

13h 45m

1 stop

LIS11:35 amLisbon Humberto Delgado

Mar 11

LIS5:00 amLisbon Humberto Delgado

14h 55m

1 stop

STL2:55 pmLambert-St Louis

$460

Lufthansa

Feb 8

STL6:40 pmLambert-St Louis

22h 50m

2 stops

LIS11:30 pmLisbon Humberto Delgado

Feb 15

LIS10:15 amLisbon Humberto Delgado

19h 44m

1 stop

STL11:59 pmLambert-St Louis

$548

United Airlines flights from St. Louis to Portugal

Our best United Airlines deals on St. Louis to Portugal flight tickets

United Airlines

Feb 24

STL8:30 amLambert-St Louis

19h 45m

1 stop

LIS10:15 amLisbon Humberto Delgado

Mar 3

LIS11:55 amLisbon Humberto Delgado

14h 28m

1 stop

STL8:23 pmLambert-St Louis

$457

United Airlines

Feb 24

STL11:25 amLambert-St Louis

16h 50m

2 stops

LIS10:15 amLisbon Humberto Delgado

Mar 3

LIS10:15 amLisbon Humberto Delgado

12h 45m

1 stop

STL5:00 pmLambert-St Louis

$462

United Airlines

Apr 27

STL6:15 amLambert-St Louis

20h 05m

1 stop

LIS8:20 amLisbon Humberto Delgado

May 5

LIS11:25 amLisbon Humberto Delgado

14h 40m

1 stop

STL8:05 pmLambert-St Louis

$472

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

mié. 3/4

3:50 pm-11:35 am

1 stop13h 45m

Lisbon Humberto Delgado

mié. 3/11

5:00 am-11:51 pm

2 stops23h 51m

$455

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

mar. 2/24

8:30 am-10:15 am

1 stop19h 45m

Lisbon Humberto Delgado

mar. 3/3

11:55 am-8:23 pm

1 stop14h 28m

$457

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

mié. 3/4

3:50 pm-11:35 am

1 stop13h 45m

Lisbon Humberto Delgado

mié. 3/11

5:00 am-2:55 pm

1 stop14h 55m

$460

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

dom. 2/1

8:13 am-7:40 am

2 stops17h 27m

Porto

jue. 2/12

8:20 am-11:48 pm

2 stops21h 28m

$461

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

mar. 2/24

11:25 am-10:15 am

2 stops16h 50m

Lisbon Humberto Delgado

mar. 3/3

10:15 am-5:00 pm

1 stop12h 45m

$462

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

sáb. 5/2

1:00 pm-11:00 am

2 stops40h 00m

Lisbon Humberto Delgado

dom. 5/10

5:05 am-1:25 pm

1 stop14h 20m

$467

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

lun. 4/27

6:15 am-8:20 am

1 stop20h 05m

Lisbon Humberto Delgado

mar. 5/5

11:25 am-8:05 pm

1 stop14h 40m

$472

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

jue. 3/5

11:22 am-11:45 am

2 stops18h 23m

Porto

jue. 3/12

8:20 am-11:48 pm

2 stops20h 28m

$486

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mié. 2/11

9:33 am-8:00 pm

2 stops28h 27m

Porto

lun. 2/16

4:40 pm-11:22 pm

2 stops36h 42m

$592

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mié. 3/18

12:28 pm-10:30 am

2 stops17h 02m

Porto

mié. 3/25

5:00 am-11:58 pm

2 stops23h 58m

$593

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from St. Louis is in January. Flight prices, which tend to average around $622, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Portugal from St. Louis during November instead. Flights to Portugal in November, while not as cheap as those in January, still average around $764.

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 $1,081 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 $780 on momondo.

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

You could potentially save up to 37% 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	13h 45m
Direct flights	None

The fastest flight from St. Louis to Portugal takes 13h 45m

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?
The number of operators available for flights from Lambert-St Louis Airport to Portugal is 6 as of January 2026.
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
American Airlines	PriceFrom $505	Free Cancellation	Rating 7.2 11,169 reviews	Search American Airlines flights
Lufthansa	PriceFrom $520	Free Cancellation	Rating 6.8 7,736 reviews	Search Lufthansa flights
Delta	PriceFrom $550	Free Cancellation	Rating 7.9 8,085 reviews	Search Delta flights
Iberia	PriceFrom $571	Free Cancellation	Rating 7.0 3,094 reviews	Search Iberia flights
United Airlines	PriceFrom $617	Free Cancellation	Rating 7.4 9,189 reviews	Search United Airlines flights
Air Canada	PriceFrom $741	Free Cancellation	Rating 7.1 10,644 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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Find better results for your trip to Portugal

Popular cities in Portugal

Flights to Lisbonfrom $340

Flights to Portofrom $327

Flights to Funchalfrom $406

Flights to Farofrom $386

Flights to Ponta Delgadafrom $422

Flights to Lajesfrom $461

Flights to Hortafrom $487

Flights to Pico Islandfrom $459

Flights to Porto Santofrom $633

Flights to Velasfrom $474

Cheap flights from St. Louis to Portugal from $354

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 4/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names and deals

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Filter for what you want

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Find the cheapest flights from St. Louis to Portugal

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Lufthansa flights from St. Louis to Portugal

Our best Lufthansa deals on St. Louis to Portugal flight tickets

United Airlines flights from St. Louis to Portugal

Our best United Airlines deals on St. Louis to Portugal flight tickets

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

See travel insights to Portugal from

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

What is the cheapest month to fly to Portugal?

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

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

You could potentially save up to 37% on your flight if you consider stops on a St. Louis to Portugal flight.

What is the cheapest airline that flies from Lambert-St Louis to Portugal?

Aer Lingus, American Airlines, and Air Canada are the most popular carriers operating from Lambert-St Louis to Portugal

What airlines fly to Portugal?

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

Direct flights

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

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?

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

Best airlines flying from St. Louis to Portugal

Compare and see reviews for airlines that fly from St. Louis to Portugal with momondo

Why use momondo?

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

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

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

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

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Portugal

Popular cities in Portugal

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