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Cheap flights from St. Louis to Porto from $349

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Iberia Logo
8:29 am - 11:45 amSTL  Lambert-St Louis-OPO Porto
21h 16m2 stops Dallas/Fort Worth Madrid Barajas
Iberia Logo
12:25 pm - 9:31 amOPO  Porto-STL Lambert-St Louis
27h 06m2 stops Madrid Barajas Dallas/Fort Worth
$590Iberia
Sun, Nov 15 - Mon, Nov 23
Iberia Logo
5:27 pm - 11:45 amSTL  Lambert-St Louis-OPO Porto
36h 18m2 stops Chicago O'Hare Intl Madrid Barajas
Iberia Logo
4:40 pm - 6:17 pmOPO  Porto-STL Lambert-St Louis
31h 37m2 stops Madrid Barajas Chicago O'Hare Intl
$606Iberia
Mon, Oct 12 - Tue, Nov 10
Iberia Logo
5:27 pm - 11:45 amSTL  Lambert-St Louis-OPO Porto
36h 18m2 stops Chicago O'Hare Intl Madrid Barajas
Iberia Logo
8:40 pm - 7:22 pmOPO  Porto-STL Lambert-St Louis
28h 42m2 stops Madrid Barajas Chicago O'Hare Intl
$606Iberia
Mon, Oct 12 - Tue, Nov 10
Lufthansa Logo
11:29 am - 9:30 amSTL  Lambert-St Louis-OPO Porto
17h 01m1 stop Newark
Lufthansa Logo
6:15 am - 9:40 pmOPO  Porto-STL Lambert-St Louis
21h 25m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
$612Lufthansa
Tue, Oct 27 - Fri, Nov 6
Delta Logo
7:00 am - 10:35 amSTL  Lambert-St Louis-OPO Porto
22h 35m2 stops Atlanta Hartsfield-Jackson Paris Charles de Gaulle
Delta Logo
5:00 am - 8:51 pmOPO  Porto-STL Lambert-St Louis
21h 51m2 stops Amsterdam Schiphol Detroit Metropolitan Wayne County
$617Delta
Tue, Oct 27 - Fri, Nov 6
Lufthansa Logo
11:29 am - 9:30 amSTL  Lambert-St Louis-OPO Porto
17h 01m1 stop Newark
Lufthansa Logo
6:15 am - 9:40 pmOPO  Porto-STL Lambert-St Louis
21h 25m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
$628Lufthansa
Tue, Oct 27 - Fri, Nov 6
United Airlines Logo
11:29 am - 9:30 amSTL  Lambert-St Louis-OPO Porto
17h 01m1 stop Newark
United Airlines Logo
6:00 am - 1:45 pmOPO  Porto-STL Lambert-St Louis
13h 45m1 stop Frankfurt am Main
$631United Airlines
Tue, Oct 27 - Fri, Nov 6
United Airlines Logo
9:59 am - 9:30 amSTL  Lambert-St Louis-OPO Porto
17h 31m1 stop Newark
United Airlines Logo
12:35 pm - 9:52 pmOPO  Porto-STL Lambert-St Louis
15h 17m1 stop Newark
$634United Airlines
Sun, Nov 15 - Mon, Nov 23
United Airlines Logo
4:39 pm - 9:30 amSTL  Lambert-St Louis-OPO Porto
34h 51m2 stops Denver Intl Newark
United Airlines Logo
12:35 pm - 9:52 pmOPO  Porto-STL Lambert-St Louis
15h 17m1 stop Newark
$639United Airlines
Sat, Nov 14 - Mon, Nov 23
Lufthansa Logo
8:30 am - 11:25 pmSTL  Lambert-St Louis-OPO Porto
32h 55m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss
Lufthansa Logo
6:00 am - 3:43 pmOPO  Porto-STL Lambert-St Louis
39h 43m2 stops Frankfurt am Main Chicago O'Hare Intl
$692Lufthansa
Tue, Oct 13 - Fri, Oct 23

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United Airlines flights from St. Louis to Porto

Our best United Airlines deals on St. Louis to Porto flight tickets
United Airlines
Oct 27
STL11:29 amLambert-St Louis
17h 01m
1 stop
OPO9:30 amPorto
Nov 6
OPO6:00 amPorto
13h 45m
1 stop
STL1:45 pmLambert-St Louis
$631
United Airlines
Nov 15
STL9:59 amLambert-St Louis
17h 31m
1 stop
OPO9:30 amPorto
Nov 23
OPO12:35 pmPorto
15h 17m
1 stop
STL9:52 pmLambert-St Louis
$634
United Airlines
Nov 14
STL4:39 pmLambert-St Louis
34h 51m
2 stops
OPO9:30 amPorto
Nov 23
OPO12:35 pmPorto
15h 17m
1 stop
STL9:52 pmLambert-St Louis
$639

Iberia flights from St. Louis to Porto

Our best Iberia deals on St. Louis to Porto flight tickets
Iberia
Nov 15
STL8:29 amLambert-St Louis
21h 16m
2 stops
OPO11:45 amPorto
Nov 23
OPO12:25 pmPorto
27h 06m
2 stops
STL9:31 amLambert-St Louis
$590
Iberia
Oct 12
STL5:27 pmLambert-St Louis
36h 18m
2 stops
OPO11:45 amPorto
Nov 10
OPO4:40 pmPorto
31h 37m
2 stops
STL6:17 pmLambert-St Louis
$606
Iberia
Nov 14
STL1:20 pmLambert-St Louis
20h 40m
2 stops
OPO4:00 pmPorto
Nov 23
OPO4:40 pmPorto
22h 51m
2 stops
STL9:31 amLambert-St Louis
$640

momondo Fare Finder

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

Fly from

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Route

Depart

Return

Price

Cheapest round-trip

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Sun 11/15

8:29 am-11:45 am

2 stops21h 16m

Porto

Mon 11/23

12:25 pm-9:31 am

2 stops27h 06m

$590

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Mon 10/12

5:27 pm-11:45 am

2 stops36h 18m

Porto

Tue 11/10

4:40 pm-6:17 pm

2 stops31h 37m

$606

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Mon 10/12

5:27 pm-11:45 am

2 stops36h 18m

Porto

Tue 11/10

8:40 pm-7:22 pm

2 stops28h 42m

$606

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 10/27

11:29 am-9:30 am

1 stop17h 01m

Porto

Fri 11/6

6:15 am-9:40 pm

2 stops21h 25m

$612

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 10/27

7:00 am-10:35 am

2 stops22h 35m

Porto

Fri 11/6

5:00 am-8:51 pm

2 stops21h 51m

$617

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 10/27

11:29 am-9:30 am

1 stop17h 01m

Porto

Fri 11/6

6:15 am-9:40 pm

2 stops21h 25m

$628
Quickest round-trip

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 10/27

11:29 am-9:30 am

1 stop17h 01m

Porto

Fri 11/6

6:00 am-1:45 pm

1 stop13h 45m

$631

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Sun 11/15

9:59 am-9:30 am

1 stop17h 31m

Porto

Mon 11/23

12:35 pm-9:52 pm

1 stop15h 17m

$634

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Sat 11/14

4:39 pm-9:30 am

2 stops34h 51m

Porto

Mon 11/23

12:35 pm-9:52 pm

1 stop15h 17m

$639

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 10/13

8:30 am-11:25 pm

2 stops32h 55m

Porto

Fri 10/23

6:00 am-3:43 pm

2 stops39h 43m

$692

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 Porto from

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

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 Porto?

The month of January is, on average, the cheapest month to fly to Porto from St. Louis, with most prices found around $510. If you aren’t able to travel during the month of January, then book flights to Porto from St. Louis during February instead. Flights to Porto in February, while not as cheap as those in January, still average around $520.

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

You could potentially save up to 15% on your flight if you consider stops on a St. Louis to Porto flight.

When to book flights from St. Louis to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Porto according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Porto (STL to OPO) flight deals and tips

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

Best Price Found

$349

Fastest flight time

10h 25m

Direct flights

None
The best one-way flight to Porto from St. Louis in the past 72 hours is $349. The best round-trip flight deal from St. Louis to Porto found on momondo in the last 72 hours is $590.
The fastest flight from St. Louis to Porto takes 10h 25m
There are no direct flights from St. Louis to Porto. There are no popular flight routes from St. Louis to Porto.
Search flight deals

Frequently asked questions about flying from St. Louis to Porto

  • How far is Lambert-St Louis to Porto by plane?

    There are 4156.0 mi between Lambert-St Louis and Porto. A reasonable flight in good conditions will take 10h 25m.

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

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

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The travel and health documents you'll need for your trip to Porto Airport 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 Porto Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Porto?

Best airlines flying from St. Louis to Porto

Compare and see reviews for airlines that fly from St. Louis to Porto with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $493Free CancellationRating
6.8
8,240 reviews
Search Lufthansa flights
United AirlinesPriceFrom $588Free CancellationRating
7.4
10,247 reviews
Search United Airlines flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Coimbra
Vila Nova de Gaia
Braga
Aveiro
Pinhao
Matosinhos
Esposende
Chaves
Viseu
Arcos de Valdevez
Espinho
Guimarães
Lamego
Ponte de Lima
Penafiel
Caminha
Mira

Why use momondo?

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

Finding the right flight to Porto from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Porto quick and easy, saving you time and money.

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

All flight searches from St. Louis to Porto on momondo can be filtered to show those which offer flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Porto.

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

Price alerts on flights to Porto from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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