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 41% 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 July 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.

$334 Cheap Flights from St. Louis to Portugal in 2025

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from St. Louis to Portugal

Round-trip

One-way

Last minute

Cheap round-trip flights

6:45 am - 9:20 amSTL-LIS

21h 35m2 stops

5:00 am - 1:55 pmLIS-STL

14h 55m1 stop

$560

Find Deal

Tue, Oct 28 - Wed, Nov 5

6:43 pm - 9:20 amSTL-LIS

33h 37m2 stops

10:55 am - 5:14 pmLIS-STL

36h 19m2 stops

$570Air Canada

Find Deal

Mon, Oct 27 - Thu, Nov 6

8:20 am - 9:20 amSTL-LIS

20h 00m2 stops

5:00 am - 1:55 pmLIS-STL

14h 55m1 stop

$576United Airlines

Find Deal

Tue, Oct 28 - Fri, Nov 7

4:05 pm - 9:20 amSTL-LIS

12h 15m1 stop

5:00 am - 1:55 pmLIS-STL

14h 55m1 stop

$579United Airlines

Find Deal

Sun, Oct 26 - Fri, Nov 7

11:49 am - 8:10 amSTL-LIS

15h 21m1 stop

5:00 am - 1:55 pmLIS-STL

14h 55m1 stop

$618Lufthansa

Find Deal

Tue, Oct 28 - Wed, Nov 5

12:25 pm - 12:30 amSTL-LIS

30h 05m2 stops

5:00 am - 10:47 pmLIS-STL

23h 47m2 stops

$632Lufthansa

Find Deal

Sat, Oct 25 - Wed, Nov 5

7:53 pm - 8:05 pmSTL-LIS

18h 12m2 stops

8:20 am - 9:43 amLIS-STL

30h 23m2 stops

$651Iberia

Find Deal

Sat, Oct 18 - Sat, Nov 1

6:25 am - 7:40 amSTL-OPO

20h 15m2 stops

8:40 pm - 9:54 amOPO-STL

19h 14m2 stops

$663American Airlines

Find Deal

Tue, Oct 28 - Sat, Nov 8

6:25 am - 7:40 amSTL-OPO

20h 15m2 stops

8:40 pm - 9:54 amOPO-STL

19h 14m2 stops

$664American Airlines

Find Deal

Tue, Oct 28 - Sat, Nov 8

9:56 am - 3:55 pmSTL-OPO

23h 59m2 stops

8:35 pm - 11:54 pmOPO-STL

33h 19m2 stops

$779Iberia

Find Deal

Sun, Oct 5 - Mon, Oct 20

Iberia flights from St. Louis to Portugal

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

Iberia

Oct 18

STL7:53 pmLambert-St Louis

18h 12m

2 stops

LIS8:05 pmLisbon Humberto Delgado

Nov 1

LIS8:20 amLisbon Humberto Delgado

30h 23m

2 stops

STL9:43 amLambert-St Louis

$651

Find similar

Iberia

Oct 5

STL9:56 amLambert-St Louis

23h 59m

2 stops

OPO3:55 pmPorto

Oct 20

OPO8:35 pmPorto

33h 19m

2 stops

STL11:54 pmLambert-St Louis

$779

Find similar

Iberia

Oct 6

STL6:05 pmLambert-St Louis

19h 50m

2 stops

OPO7:55 pmPorto

Oct 20

OPO8:35 pmPorto

33h 19m

2 stops

STL11:54 pmLambert-St Louis

$784

Find similar

United Airlines flights from St. Louis to Portugal

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

United Airlines

Oct 28

STL8:20 amLambert-St Louis

20h 00m

2 stops

LIS9:20 amLisbon Humberto Delgado

Nov 7

LIS5:00 amLisbon Humberto Delgado

14h 55m

1 stop

STL1:55 pmLambert-St Louis

$576

Find similar

United Airlines

Oct 26

STL4:05 pmLambert-St Louis

12h 15m

1 stop

LIS9:20 amLisbon Humberto Delgado

Nov 7

LIS5:00 amLisbon Humberto Delgado

14h 55m

1 stop

STL1:55 pmLambert-St Louis

$579

Find similar

United Airlines

Oct 26

STL7:00 amLambert-St Louis

22h 15m

2 stops

LIS10:15 amLisbon Humberto Delgado

Nov 5

LIS5:00 amLisbon Humberto Delgado

14h 55m

1 stop

STL1:55 pmLambert-St Louis

$581

Find similar

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 $641, 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 $672.

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 $963 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 $916 on momondo.

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

You could potentially save up to 1% 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

Best Price Found	$334
Fastest flight time	10h 21m
Direct flights	None
Airports in Portugal	3 airports

The best one-way flight to Portugal from St. Louis in the past 72 hours is $334. The best round-trip flight deal from St. Louis to Portugal found on momondo in the last 72 hours is $560.

The fastest flight from St. Louis to Portugal takes 10h 21m

There are no direct flights from St. Louis to Portugal. Popular non-direct routes for this connection are Lambert-St Louis Airport - Lisbon Humberto Delgado Airport, Lambert-St Louis Airport - Porto Airport and Lambert-St Louis Airport - Lajes Airport.

There are 3 airports near Portugal: Lajes (TER), Lisbon Humberto Delgado (LIS), Porto (OPO)

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 July 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
Iberia	PriceFrom $568	Free Cancellation	Rating 7.0 2,828 reviews	Search Iberia flights
Lufthansa	PriceFrom $601	Free Cancellation	Rating 6.8 7,199 reviews	Search Lufthansa flights
United Airlines	PriceFrom $602	Free Cancellation	Rating 7.4 8,846 reviews	Search United Airlines flights
American Airlines	PriceFrom $614	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
British Airways	PriceFrom $642	Free Cancellation	Rating 6.6 7,109 reviews	Search British Airways flights
Delta	PriceFrom $652	Free Cancellation	Rating 8.0 7,951 reviews	Search Delta flights
Air Canada	PriceFrom $811	Free Cancellation	Rating 7.1 9,695 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

Find my bookings

Get notified when prices go down

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

1 adult

Tue 7/15

Tue 7/22

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Portugal

Popular cities in Portugal

Flights to Lisbonfrom $375

Flights to Portofrom $345

Flights to Funchalfrom $403

Flights to Farofrom $409

Flights to Ponta Delgadafrom $425

Flights to Lajesfrom $426

Flights to Hortafrom $503

Flights to Pico Islandfrom $525

Flights to Porto Santofrom $423

Flights to Velasfrom $572

Cheap flights from St. Louis to Portugal from $334

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 9/15. 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

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from St. Louis to Portugal

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Iberia flights from St. Louis to Portugal

Our best Iberia 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

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?

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 1% 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

Best Price Found

Fastest flight time

Direct flights

Airports in Portugal

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