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

British Airways and Lufthansa are the most popular carriers operating from Porto to Lambert-St Louis

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

Prices for flights from Porto Airport to Lambert-St Louis Airport refresh daily.

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

What documentation or ID do you need to fly to Lambert-St Louis Airport?

The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$725 Cheap Flights from Porto to St. Louis in 2025/26

1 adult

0 bags

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Find the cheapest flights from Porto to St. Louis

Round-trip

One-way

Cheap round-trip flights

12:25 pm - 8:54 amOPO-STL

26h 29m2 stops

1:30 pm - 11:45 amSTL-OPO

16h 15m2 stops

$775Iberia

Find Deal

Fri, Feb 6 - Sun, Feb 8

8:20 am - 8:54 amOPO-STL

30h 34m2 stops

9:25 am - 8:00 pmSTL-OPO

28h 35m2 stops

$793Iberia

Find Deal

Fri, Feb 6 - Sun, Feb 8

Iberia flights from Porto to St. Louis

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

Iberia

Feb 6

OPO12:25 pmPorto

26h 29m

2 stops

STL8:54 amLambert-St Louis

Feb 8

STL1:30 pmLambert-St Louis

16h 15m

2 stops

OPO11:45 amPorto

$775

Find similar

Iberia

Feb 6

OPO8:20 amPorto

30h 34m

2 stops

STL8:54 amLambert-St Louis

Feb 8

STL9:25 amLambert-St Louis

28h 35m

2 stops

OPO8:00 pmPorto

$793

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Fri 2/6

12:25 pm-8:54 am

2 stops26h 29m

Lambert-St Louis

Sun 2/8

1:30 pm-11:45 am

2 stops16h 15m

$775

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Fri 2/6

8:20 am-8:54 am

2 stops30h 34m

Lambert-St Louis

Sun 2/8

9:25 am-8:00 pm

2 stops28h 35m

$793

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 10/29

8:40 pm-7:09 pm

2 stops27h 29m

$736

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 10/29

6:00 am-2:55 pm

1 stop13h 55m

$740

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 10/29

6:00 am-2:55 pm

1 stop13h 55m

$748

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 10/29

6:00 am-2:55 pm

1 stop13h 55m

$766

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 10/29

6:00 am-5:39 pm

2 stops16h 39m

$775

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

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

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

You could potentially save up to 18% on your flight if you consider stops on a Porto to St. Louis flight.

When to book flights from Porto to St. Louis

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

Estimated round-trip price

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

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

Direct flights	None

There are no direct flights from Porto to St. Louis. There are no popular flight routes from Porto to St. Louis.

Search flight deals

How far is Porto to Lambert-St Louis by plane?
There are 4156.0 mi between Porto and Lambert-St Louis. A reasonable flight in good conditions will take 26h 29m.
When did momondo last update prices for flights from Porto Airport to Lambert-St Louis Airport?
Prices for flights from Porto Airport to Lambert-St Louis Airport refresh daily.
How old do you have to be to fly from Porto Airport to Lambert-St Louis 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 Porto Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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Florissant

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O'Fallon

Fenton

Collinsville

Wentzville

Alton

St. Peters

Farmington

Festus

Glencoe

Clayton

Edwardsville

Eureka

Litchfield

Shrewsbury

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

It is quick and easy to find Porto to St. Louis 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 St. Louis that suits you.

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

Yes. All flights to St. Louis from Porto on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo helps you find the best flight between Porto and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Of course. momondo tracks the price of Porto to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.