Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Portugal from $348

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 1/31. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:05 pm - 8:55 amSTL  Lambert-St Louis-LIS Lisbon Humberto Delgado
10h 50m1 stop Toronto Pearson Intl
Multiple Airlines Logo
5:00 am - 1:45 pmLIS  Lisbon Humberto Delgado-STL Lambert-St Louis
14h 45m1 stop Frankfurt am Main
$700Multiple Airlines
Wed, Nov 18 - Wed, Nov 25
Multiple Airlines Logo
4:05 pm - 9:20 amSTL  Lambert-St Louis-LIS Lisbon Humberto Delgado
12h 15m1 stop Toronto Pearson Intl
Multiple Airlines Logo
5:00 am - 1:45 pmLIS  Lisbon Humberto Delgado-STL Lambert-St Louis
14h 45m1 stop Frankfurt am Main
$700Multiple Airlines
Tue, Oct 27 - Wed, Nov 11
Lufthansa Logo
11:29 am - 1:30 pmSTL  Lambert-St Louis-LIS Lisbon Humberto Delgado
20h 01m2 stops Newark Munich Franz Josef Strauss
Lufthansa Logo
5:00 am - 1:45 pmLIS  Lisbon Humberto Delgado-STL Lambert-St Louis
14h 45m1 stop Frankfurt am Main
$709Lufthansa
Wed, Nov 18 - Wed, Nov 25
Lufthansa Logo
6:50 pm - 11:30 pmSTL  Lambert-St Louis-LIS Lisbon Humberto Delgado
23h 40m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss
Lufthansa Logo
5:00 am - 1:45 pmLIS  Lisbon Humberto Delgado-STL Lambert-St Louis
14h 45m1 stop Frankfurt am Main
$709Lufthansa
Tue, Oct 27 - Wed, Nov 11
Delta Logo
6:47 am - 8:00 amSTL  Lambert-St Louis-LIS Lisbon Humberto Delgado
19h 13m2 stops Detroit Metropolitan Wayne County New York John F Kennedy Intl
Delta Logo
5:00 am - 11:23 pmLIS  Lisbon Humberto Delgado-STL Lambert-St Louis
24h 23m2 stops Amsterdam Schiphol Minneapolis St Paul
$740Delta
Wed, Nov 4 - Tue, Nov 10
United Airlines Logo
5:20 pm - 9:30 amSTL  Lambert-St Louis-OPO Porto
10h 10m1 stop Newark
United Airlines Logo
6:00 am - 3:26 pmOPO  Porto-STL Lambert-St Louis
39h 26m2 stops Frankfurt am Main Toronto Pearson Intl
$743United Airlines
Mon, Dec 7 - Thu, Dec 10
United Airlines Logo
7:30 am - 9:30 amSTL  Lambert-St Louis-OPO Porto
20h 00m1 stop Newark
United Airlines Logo
6:00 am - 9:13 pmOPO  Porto-STL Lambert-St Louis
21h 13m2 stops Frankfurt am Main Chicago O'Hare Intl
$745United Airlines
Mon, Dec 7 - Thu, Dec 10
Air Canada Logo
12:10 pm - 9:20 amSTL  Lambert-St Louis-LIS Lisbon Humberto Delgado
15h 10m1 stop Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
11:20 am - 12:10 pmLIS  Lisbon Humberto Delgado-STL Lambert-St Louis
29h 50m2 stops Toronto Pearson Intl Chicago O'Hare Intl
$760Air Canada
Sun, Oct 18 - Tue, Oct 27
Air Canada Logo
8:00 am - 9:20 amSTL  Lambert-St Louis-LIS Lisbon Humberto Delgado
19h 20m2 stops Chicago O'Hare Intl Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
11:20 am - 10:32 amLIS  Lisbon Humberto Delgado-STL Lambert-St Louis
28h 12m2 stops Toronto Pearson Intl Chicago O'Hare Intl
$764Air Canada
Sun, Oct 18 - Tue, Oct 27
Delta Logo
10:31 am - 3:10 pmSTL  Lambert-St Louis-LIS Lisbon Humberto Delgado
22h 39m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle
Delta Logo
5:00 am - 8:51 pmLIS  Lisbon Humberto Delgado-STL Lambert-St Louis
21h 51m2 stops Amsterdam Schiphol Detroit Metropolitan Wayne County
$790Delta
Tue, Nov 3 - Mon, Nov 9

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

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

Trusted and free

Trusted and free

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

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Air Canada flights from St. Louis to Portugal

Our best Air Canada deals on St. Louis to Portugal flight tickets
Air Canada
Oct 18
STL12:10 pmLambert-St Louis
15h 10m
1 stop
LIS9:20 amLisbon Humberto Delgado
Oct 27
LIS11:20 amLisbon Humberto Delgado
29h 50m
2 stops
STL12:10 pmLambert-St Louis
$760
Air Canada
Nov 16
STL9:40 amLambert-St Louis
19h 00m
2 stops
LIS10:40 amLisbon Humberto Delgado
Nov 19
LIS8:55 amLisbon Humberto Delgado
33h 15m
2 stops
STL12:10 pmLambert-St Louis
$783
Air Canada
Oct 15
STL12:10 pmLambert-St Louis
15h 10m
1 stop
LIS9:20 amLisbon Humberto Delgado
Oct 22
LIS11:25 amLisbon Humberto Delgado
34h 18m
2 stops
STL3:43 pmLambert-St Louis
$805

Iberia flights from St. Louis to Portugal

Our best Iberia deals on St. Louis to Portugal flight tickets
Iberia
Nov 18
STL11:32 amLambert-St Louis
18h 18m
2 stops
LIS11:50 amLisbon Humberto Delgado
Nov 25
LIS8:45 pmLisbon Humberto Delgado
18h 45m
2 stops
STL9:30 amLambert-St Louis
$726
Iberia
Nov 10
STL9:50 amLambert-St Louis
28h 10m
2 stops
OPO8:00 pmPorto
Nov 17
OPO8:20 amPorto
17h 02m
2 stops
STL7:22 pmLambert-St Louis
$735
Iberia
Oct 27
STL10:12 amLambert-St Louis
16h 28m
2 stops
OPO7:40 amPorto
Nov 6
OPO8:20 amPorto
17h 02m
2 stops
STL7:22 pmLambert-St Louis
$794

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 August 13, 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
Quickest round-trip

St. LouisLisbon

STL Lambert-St Louis - LIS Lisbon Humberto Delgado

STLLIS

Lambert-St Louis

Wed 11/18

4:05 pm-8:55 am

1 stop10h 50m

Lisbon Humberto Delgado

Wed 11/25

5:00 am-1:45 pm

1 stop14h 45m

$700

St. LouisLisbon

STL Lambert-St Louis - LIS Lisbon Humberto Delgado

STLLIS

Lambert-St Louis

Tue 10/27

4:05 pm-9:20 am

1 stop12h 15m

Lisbon Humberto Delgado

Wed 11/11

5:00 am-1:45 pm

1 stop14h 45m

$700

St. LouisLisbon

STL Lambert-St Louis - LIS Lisbon Humberto Delgado

STLLIS

Lambert-St Louis

Wed 11/18

11:29 am-1:30 pm

2 stops20h 01m

Lisbon Humberto Delgado

Wed 11/25

5:00 am-1:45 pm

1 stop14h 45m

$709

St. LouisLisbon

STL Lambert-St Louis - LIS Lisbon Humberto Delgado

STLLIS

Lambert-St Louis

Tue 10/27

6:50 pm-11:30 pm

2 stops23h 40m

Lisbon Humberto Delgado

Wed 11/11

5:00 am-1:45 pm

1 stop14h 45m

$709

St. LouisLisbon

STL Lambert-St Louis - LIS Lisbon Humberto Delgado

STLLIS

Lambert-St Louis

Wed 11/4

6:47 am-8:00 am

2 stops19h 13m

Lisbon Humberto Delgado

Tue 11/10

5:00 am-11:23 pm

2 stops24h 23m

$740

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Mon 12/7

5:20 pm-9:30 am

1 stop10h 10m

Porto

Thu 12/10

6:00 am-3:26 pm

2 stops39h 26m

$743

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Mon 12/7

7:30 am-9:30 am

1 stop20h 00m

Porto

Thu 12/10

6:00 am-9:13 pm

2 stops21h 13m

$745

St. LouisLisbon

STL Lambert-St Louis - LIS Lisbon Humberto Delgado

STLLIS

Lambert-St Louis

Sun 10/18

12:10 pm-9:20 am

1 stop15h 10m

Lisbon Humberto Delgado

Tue 10/27

11:20 am-12:10 pm

2 stops29h 50m

$760

St. LouisLisbon

STL Lambert-St Louis - LIS Lisbon Humberto Delgado

STLLIS

Lambert-St Louis

Sun 10/18

8:00 am-9:20 am

2 stops19h 20m

Lisbon Humberto Delgado

Tue 10/27

11:20 am-10:32 am

2 stops28h 12m

$764

St. LouisLisbon

STL Lambert-St Louis - LIS Lisbon Humberto Delgado

STLLIS

Lambert-St Louis

Tue 11/3

10:31 am-3:10 pm

2 stops22h 39m

Lisbon Humberto Delgado

Mon 11/9

5:00 am-8:51 pm

2 stops21h 51m

$790

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 February. Flight prices, which tend to average around $520, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Portugal from St. Louis during April instead. Flights to Portugal in April, while not as cheap as those in February, still average around $602.

How far in advance should I book a flight from St. Louis 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 $1,019 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 6% 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

10h 30m

Direct flights

None
The fastest flight from St. Louis to Portugal takes 10h 30m
There are no direct flights from St. Louis to Portugal. There are no popular flight routes from St. Louis to Portugal.
Search flight deals

Frequently asked questions about flying from 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?

  • 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
LufthansaPriceFrom $493Free CancellationRating
6.8
8,186 reviews
Search Lufthansa flights
American AirlinesPriceFrom $502Free CancellationRating
7.1
11,924 reviews
Search American Airlines flights
DeltaPriceFrom $558Free CancellationRating
7.8
8,503 reviews
Search Delta flights
British AirwaysPriceFrom $574Free CancellationRating
6.7
8,161 reviews
Search British Airways flights
United AirlinesPriceFrom $588Free CancellationRating
7.4
10,113 reviews
Search United Airlines flights
Air CanadaPriceFrom $649Free CancellationRating
7.1
11,467 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
Sat 9/12
Sat 9/19
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

Popular flights according to clicks in the last 7 days on momondo
Flights to Lisbonfrom $562
Flights to Portofrom $524
Flights to Funchalfrom $606
Flights to Farofrom $610
Flights to Ponta Delgadafrom $569
Flights to Lajesfrom $633
Flights to Hortafrom $681
Flights to Pico Islandfrom $642
Flights to Porto Santofrom $713
Flights to Velasfrom $694