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Cheap flights from St. Louis to Porto from $354

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.
Multiple Airlines Logo
4:05 pm - 6:30 pmSTL  Lambert-St Louis-OPO Porto
20h 25m2 stops Toronto Pearson Intl Zurich
Multiple Airlines Logo
6:00 am - 1:45 pmOPO  Porto-STL Lambert-St Louis
13h 45m1 stop Frankfurt am Main
$710Multiple Airlines
Tue, Feb 23 - Fri, Feb 26
United Airlines Logo
4:39 pm - 9:30 amSTL  Lambert-St Louis-OPO Porto
10h 51m1 stop Newark
United Airlines Logo
6:00 am - 1:45 pmOPO  Porto-STL Lambert-St Louis
13h 45m1 stop Frankfurt am Main
$718United Airlines
Tue, Feb 23 - Fri, Feb 26
United Airlines Logo
4:39 pm - 9:30 amSTL  Lambert-St Louis-OPO Porto
10h 51m1 stop Newark
United Airlines Logo
6:00 am - 1:45 pmOPO  Porto-STL Lambert-St Louis
13h 45m1 stop Frankfurt am Main
$719United Airlines
Tue, Feb 23 - Fri, Feb 26
United Airlines Logo
1:08 pm - 9:30 amSTL  Lambert-St Louis-OPO Porto
14h 22m2 stops Chicago O'Hare Intl Newark
United Airlines Logo
6:00 am - 1:45 pmOPO  Porto-STL Lambert-St Louis
13h 45m1 stop Frankfurt am Main
$722United Airlines
Tue, Feb 23 - Fri, Feb 26
United Airlines Logo
1:08 pm - 9:30 amSTL  Lambert-St Louis-OPO Porto
14h 22m2 stops Chicago O'Hare Intl Newark
United Airlines Logo
6:00 am - 1:45 pmOPO  Porto-STL Lambert-St Louis
13h 45m1 stop Frankfurt am Main
$723United Airlines
Tue, Feb 23 - Fri, Feb 26
Multiple Airlines Logo
4:05 pm - 11:15 amSTL  Lambert-St Louis-OPO Porto
37h 10m2 stops Toronto Pearson Intl Zurich
Multiple Airlines Logo
12:05 pm - 3:26 pmOPO  Porto-STL Lambert-St Louis
57h 21m2 stops Zurich Toronto Pearson Intl
$754Multiple Airlines
Mon, Feb 1 - Wed, Feb 10
Iberia Logo
12:53 pm - 8:15 amSTL  Lambert-St Louis-OPO Porto
13h 22m1 stop Philadelphia
Iberia Logo
8:40 pm - 7:30 pmOPO  Porto-STL Lambert-St Louis
28h 50m2 stops Madrid Barajas Dallas/Fort Worth
$778Iberia
Mon, Apr 5 - Wed, Apr 21
Iberia Logo
2:21 pm - 8:00 pmSTL  Lambert-St Louis-OPO Porto
23h 39m2 stops Chicago O'Hare Intl Madrid Barajas
Iberia Logo
8:20 am - 7:33 pmOPO  Porto-STL Lambert-St Louis
17h 13m2 stops Madrid Barajas Chicago O'Hare Intl
$786Iberia
Mon, Apr 5 - Wed, Apr 21
Lufthansa Logo
6:30 am - 9:45 amSTL  Lambert-St Louis-OPO Porto
21h 15m1 stop Newark
Lufthansa Logo
4:35 pm - 1:25 pmOPO  Porto-STL Lambert-St Louis
26h 50m1 stop Frankfurt am Main
$871Lufthansa
Mon, Apr 26 - Mon, May 3
Lufthansa Logo
6:03 am - 9:30 amSTL  Lambert-St Louis-OPO Porto
21h 27m1 stop Newark
Lufthansa Logo
6:00 am - 1:45 pmOPO  Porto-STL Lambert-St Louis
13h 45m1 stop Frankfurt am Main
$1,343Lufthansa
Sun, Dec 20 - Sun, Dec 27

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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
Feb 23
STL4:39 pmLambert-St Louis
10h 51m
1 stop
OPO9:30 amPorto
Feb 26
OPO6:00 amPorto
13h 45m
1 stop
STL1:45 pmLambert-St Louis
$718
United Airlines
Feb 23
STL4:39 pmLambert-St Louis
10h 51m
1 stop
OPO9:30 amPorto
Feb 26
OPO6:00 amPorto
13h 45m
1 stop
STL1:45 pmLambert-St Louis
$719
United Airlines
Feb 23
STL1:08 pmLambert-St Louis
14h 22m
2 stops
OPO9:30 amPorto
Feb 26
OPO6:00 amPorto
13h 45m
1 stop
STL1:45 pmLambert-St Louis
$722

Iberia flights from St. Louis to Porto

Our best Iberia deals on St. Louis to Porto flight tickets
Iberia
Apr 5
STL12:53 pmLambert-St Louis
13h 22m
1 stop
OPO8:15 amPorto
Apr 21
OPO8:40 pmPorto
28h 50m
2 stops
STL7:30 pmLambert-St Louis
$778
Iberia
Apr 5
STL2:21 pmLambert-St Louis
23h 39m
2 stops
OPO8:00 pmPorto
Apr 21
OPO8:20 amPorto
17h 13m
2 stops
STL7:33 pmLambert-St Louis
$786
Iberia
Apr 26
STL1:29 pmLambert-St Louis
12h 46m
1 stop
OPO8:15 amPorto
May 3
OPO8:40 pmPorto
28h 53m
2 stops
STL7:33 pmLambert-St Louis
$813

momondo Fare Finder

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

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Route

Depart

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Price

Cheapest round-trip

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 2/23

4:05 pm-6:30 pm

2 stops20h 25m

Porto

Fri 2/26

6:00 am-1:45 pm

1 stop13h 45m

$710
Quickest round-trip

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 2/23

4:39 pm-9:30 am

1 stop10h 51m

Porto

Fri 2/26

6:00 am-1:45 pm

1 stop13h 45m

$718

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 2/23

4:39 pm-9:30 am

1 stop10h 51m

Porto

Fri 2/26

6:00 am-1:45 pm

1 stop13h 45m

$719

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 2/23

1:08 pm-9:30 am

2 stops14h 22m

Porto

Fri 2/26

6:00 am-1:45 pm

1 stop13h 45m

$722

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Tue 2/23

1:08 pm-9:30 am

2 stops14h 22m

Porto

Fri 2/26

6:00 am-1:45 pm

1 stop13h 45m

$723

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Mon 2/1

4:05 pm-11:15 am

2 stops37h 10m

Porto

Wed 2/10

12:05 pm-3:26 pm

2 stops57h 21m

$754

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Mon 4/5

12:53 pm-8:15 am

1 stop13h 22m

Porto

Wed 4/21

8:40 pm-7:30 pm

2 stops28h 50m

$778

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Mon 4/5

2:21 pm-8:00 pm

2 stops23h 39m

Porto

Wed 4/21

8:20 am-7:33 pm

2 stops17h 13m

$786

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Mon 4/26

6:30 am-9:45 am

1 stop21h 15m

Porto

Mon 5/3

4:35 pm-1:25 pm

1 stop26h 50m

$871

St. LouisPorto

STL Lambert-St Louis - OPO Porto

STLOPO

Lambert-St Louis

Sun 12/20

6:03 am-9:30 am

1 stop21h 27m

Porto

Sun 12/27

6:00 am-1:45 pm

1 stop13h 45m

$1,343

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 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 42% 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

$354

Fastest flight time

10h 51m

Direct flights

None
The best one-way flight to Porto from St. Louis in the past 72 hours is $354. The best round-trip flight deal from St. Louis to Porto found on momondo in the last 72 hours is $710.
The fastest flight from St. Louis to Porto takes 10h 51m
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 51m.

  • 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
8,292 reviews
Search Lufthansa flights
United AirlinesPriceFrom $588Free CancellationRating
7.3
10,472 reviews
Search United Airlines flights

Traveling to a place near Porto?

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