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

Air Canada, United Airlines, and Lufthansa are the most popular carriers operating from Lambert-St Louis to Portugal

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 47% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 7 different airlines that fly to Portugal on a routine basis, so you have a few additional options to choose from.

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 7 as of October 2025.

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.

$331 Cheap Flights from St. Louis to Portugal in 2025/26

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Cheap round-trip flights

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11:49 am - 10:15 amSTL-LIS

17h 26m2 stops

5:00 am - 1:55 pmLIS-STL

14h 55m1 stop

$511Multiple Airlines

Find Deal

Tue, Oct 28 - Wed, Nov 5

11:04 am - 2:55 pmSTL-LIS

21h 51m2 stops

4:55 pm - 9:02 pmLIS-STL

34h 07m2 stops

$519Scandinavian Airlines

Find Deal

Thu, Nov 27 - Wed, Dec 10

11:05 am - 9:30 amSTL-OPO

16h 25m2 stops

6:00 am - 1:55 pmOPO-STL

13h 55m1 stop

$523United Airlines

Find Deal

Mon, Nov 10 - Wed, Nov 26

8:25 am - 10:15 amSTL-LIS

19h 50m1 stop

5:00 am - 1:55 pmLIS-STL

14h 55m1 stop

$524United Airlines

Find Deal

Thu, Nov 27 - Wed, Dec 10

12:31 pm - 9:30 amSTL-OPO

14h 59m2 stops

6:00 am - 1:55 pmOPO-STL

13h 55m1 stop

$527United Airlines

Find Deal

Wed, Nov 26 - Wed, Dec 3

7:41 am - 7:55 amSTL-LIS

18h 14m2 stops

5:00 am - 3:29 pmLIS-STL

40h 29m2 stops

$529Air Canada

Find Deal

Thu, Feb 19 - Wed, Feb 25

6:30 am - 9:20 amSTL-LIS

20h 50m2 stops

11:20 am - 2:30 pmLIS-STL

33h 10m2 stops

$538Air Canada

Find Deal

Tue, Nov 18 - Wed, Feb 4

6:42 pm - 10:25 pmSTL-OPO

21h 43m2 stops

6:15 am - 11:42 pmOPO-STL

23h 27m2 stops

$549Lufthansa

Find Deal

Fri, Dec 5 - Mon, Dec 15

6:43 pm - 11:30 pmSTL-LIS

22h 47m2 stops

3:55 pm - 1:55 pmLIS-STL

28h 00m1 stop

$556Lufthansa

Find Deal

Sun, Nov 23 - Tue, Dec 2

10:49 am - 9:05 amSTL-LIS

16h 16m1 stop

11:05 am - 8:38 pmLIS-STL

15h 33m1 stop

$605Iberia

Find Deal

Tue, Dec 2 - Mon, Dec 8

Air Canada flights from St. Louis to Portugal

Our best Air Canada deals on St. Louis to Portugal flight tickets

Air Canada

Feb 19

STL7:41 amLambert-St Louis

18h 14m

2 stops

LIS7:55 amLisbon Humberto Delgado

Feb 25

LIS5:00 amLisbon Humberto Delgado

40h 29m

2 stops

STL3:29 pmLambert-St Louis

$529

Find similar

Air Canada

Nov 18

STL6:30 amLambert-St Louis

20h 50m

2 stops

LIS9:20 amLisbon Humberto Delgado

Feb 4

LIS11:20 amLisbon Humberto Delgado

33h 10m

2 stops

STL2:30 pmLambert-St Louis

$538

Find similar

Air Canada

Dec 2

STL6:42 pmLambert-St Louis

32h 13m

2 stops

LIS8:55 amLisbon Humberto Delgado

Dec 8

LIS11:20 amLisbon Humberto Delgado

34h 20m

2 stops

STL3:40 pmLambert-St Louis

$541

Find similar

Delta flights from St. Louis to Portugal

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

Delta

Dec 3

STL6:05 pmLambert-St Louis

31h 55m

2 stops

LIS8:00 amLisbon Humberto Delgado

Dec 7

LIS5:30 amLisbon Humberto Delgado

18h 26m

2 stops

STL5:56 pmLambert-St Louis

$548

Find similar

Delta

Dec 3

STL6:05 pmLambert-St Louis

31h 55m

2 stops

LIS8:00 amLisbon Humberto Delgado

Dec 7

LIS5:30 amLisbon Humberto Delgado

18h 26m

2 stops

STL5:56 pmLambert-St Louis

$559

Find similar

Delta

Nov 14

STL6:09 pmLambert-St Louis

15h 01m

2 stops

LIS3:10 pmLisbon Humberto Delgado

Nov 28

LIS5:00 amLisbon Humberto Delgado

24h 23m

2 stops

STL11:23 pmLambert-St Louis

$677

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 10/28

11:49 am-10:15 am

2 stops17h 26m

Lisbon Humberto Delgado

Wed 11/5

5:00 am-1:55 pm

1 stop14h 55m

$511

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Thu 11/27

11:04 am-2:55 pm

2 stops21h 51m

Lisbon Humberto Delgado

Wed 12/10

4:55 pm-9:02 pm

2 stops34h 07m

$519

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 11/10

11:05 am-9:30 am

2 stops16h 25m

Porto

Wed 11/26

6:00 am-1:55 pm

1 stop13h 55m

$523

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Thu 11/27

8:25 am-10:15 am

1 stop19h 50m

Lisbon Humberto Delgado

Wed 12/10

5:00 am-1:55 pm

1 stop14h 55m

$524

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 11/26

12:31 pm-9:30 am

2 stops14h 59m

Porto

Wed 12/3

6:00 am-1:55 pm

1 stop13h 55m

$527

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Thu 2/19

7:41 am-7:55 am

2 stops18h 14m

Lisbon Humberto Delgado

Wed 2/25

5:00 am-3:29 pm

2 stops40h 29m

$529

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 11/18

6:30 am-9:20 am

2 stops20h 50m

Lisbon Humberto Delgado

Wed 2/4

11:20 am-2:30 pm

2 stops33h 10m

$538

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 12/5

6:42 pm-10:25 pm

2 stops21h 43m

Porto

Mon 12/15

6:15 am-11:42 pm

2 stops23h 27m

$549

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sun 11/23

6:43 pm-11:30 pm

2 stops22h 47m

Lisbon Humberto Delgado

Tue 12/2

3:55 pm-1:55 pm

1 stop28h 00m

$556

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 12/2

10:49 am-9:05 am

1 stop16h 16m

Lisbon Humberto Delgado

Mon 12/8

11:05 am-8:38 pm

1 stop15h 33m

$605

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 November. Flight prices, which tend to average around $633, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of November, then book flights to Portugal from St. Louis during February instead. Flights to Portugal in February, while not as cheap as those in November, still average around $722.

What is the cheapest day to depart on your flight to Portugal?

According to our data, Monday is the cheapest day to fly to Portugal from St. Louis. The lowest ticket price found for a Monday departure recently was $894. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Thursday, with ticket prices averaging around $1,087.

What is the cheapest time of day to depart on your flight to Portugal?

Our most recent data shows that the best time of day to fly to Portugal is at noon. Flights from St. Louis to Portugal during this time can be as low as $884. In the afternoon is when there is more demand to fly to Portugal, so prices are often more expensive at around $1,083 per ticket.

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 weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $932 when searching weeks 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 $746 on momondo.

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

You could potentially save up to 22% 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

Direct flights	None

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 7 as of October 2025.
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
Lufthansa	PriceFrom $549	Free Cancellation	Rating 6.8 7,489 reviews	Search Lufthansa flights
Iberia	PriceFrom $568	Free Cancellation	Rating 7.0 2,990 reviews	Search Iberia flights
United Airlines	PriceFrom $605	Free Cancellation	Rating 7.4 8,976 reviews	Search United Airlines flights
American Airlines	PriceFrom $614	Free Cancellation	Rating 7.2 11,042 reviews	Search American Airlines flights
British Airways	PriceFrom $642	Free Cancellation	Rating 6.7 7,456 reviews	Search British Airways flights
Delta	PriceFrom $680	Free Cancellation	Rating 7.9 7,975 reviews	Search Delta flights
Air Canada	PriceFrom $823	Free Cancellation	Rating 7.1 10,297 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.

Start using Trips

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Find better results for your trip to Portugal

Popular cities in Portugal

Flights to Lisbonfrom $331

Flights to Portofrom $344

Flights to Funchalfrom $415

Flights to Farofrom $419

Flights to Ponta Delgadafrom $431

Flights to Lajesfrom $477

Flights to Hortafrom $478

Flights to Pico Islandfrom $461

Flights to Porto Santofrom $632

Flights to Velasfrom $573

Cheap flights from St. Louis to Portugal from $331

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 1/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

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Air Canada flights from St. Louis to Portugal

Our best Air Canada deals on St. Louis to Portugal flight tickets

Delta flights from St. Louis to Portugal

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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?

What is the cheapest day to depart on your flight to Portugal?

What is the cheapest time of day to depart on your flight to Portugal?

Our most recent data shows that the best time of day to fly to Portugal is at noon. Flights from St. Louis to Portugal during this time can be as low as $884. In the afternoon is when there is more demand to fly to Portugal, so prices are often more expensive at around $1,083 per ticket.

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 22% 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?

Air Canada, United Airlines, and Lufthansa 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

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