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.

$775 Cheap Flights from Porto to St. Louis in 2026

1 adult

0 bags

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Find the cheapest flights from Porto to St. Louis

Round-trip

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Cheap round-trip flights

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6:00 am - 5:44 pm

OPO

STL

17h 44m

2 stops

11:39 am - 12:50 pm

STL

OPO

19h 11m

2 stops

$868Lufthansa

qui, fev 12 - seg, fev 16

11:10 am - 12:21 pm

OPO

STL

31h 11m

3 stops

4:05 pm - 2:55 pm

STL

OPO

16h 50m

2 stops

$1,608Multiple Airlines

qui, fev 12 - seg, fev 16

11:10 am - 3:29 pm

OPO

STL

34h 19m

3 stops

8:17 am - 1:05 pm

STL

OPO

22h 48m

3 stops

$1,809Multiple Airlines

qui, fev 12 - seg, fev 16

Iberia flights from Porto to St. Louis

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

Iberia

Feb 4

OPO4:40 pmPorto

33h 33m

2 stops

STL8:13 pmLambert-St Louis

Feb 11

STL12:03 pmLambert-St Louis

25h 57m

2 stops

OPO8:00 pmPorto

$765

Iberia

Feb 4

OPO12:25 pmPorto

26h 38m

2 stops

STL9:03 amLambert-St Louis

Feb 11

STL9:33 amLambert-St Louis

20h 12m

2 stops

OPO11:45 amPorto

$768

American Airlines flights from Porto to St. Louis

Our best American Airlines deals on Porto to St. Louis flight tickets

American Airlines

Feb 4

OPO8:20 amPorto

19h 31m

3 stops

STL9:51 pmLambert-St Louis

Feb 11

STL10:00 amLambert-St Louis

19h 45m

2 stops

OPO11:45 amPorto

$5,748

American Airlines

Feb 4

OPO8:20 amPorto

19h 31m

3 stops

STL9:51 pmLambert-St Louis

Feb 11

STL10:00 amLambert-St Louis

19h 45m

2 stops

OPO11:45 amPorto

$5,766

Fly from

Fly to

Route

Depart

Return

Price

PortoSt. Louis

OPO - STL

OPOSTL

Porto

qui 2/12

6:00 am-5:44 pm

2 stops17h 44m

Lambert-St Louis

seg 2/16

11:39 am-12:50 pm

2 stops19h 11m

$868

PortoSt. Louis

OPO - STL

OPOSTL

Porto

qui 2/12

11:10 am-12:21 pm

3 stops31h 11m

Lambert-St Louis

seg 2/16

4:05 pm-2:55 pm

2 stops16h 50m

$1,608

PortoSt. Louis

OPO - STL

OPOSTL

Porto

qui 2/12

11:10 am-3:29 pm

3 stops34h 19m

Lambert-St Louis

seg 2/16

8:17 am-1:05 pm

3 stops22h 48m

$1,809

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

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

You could potentially save up to 28% 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

Fastest flight time	26h 26m
Direct flights	None

The fastest flight from Porto to St. Louis takes 26h 26m

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 26m.
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

O'Fallon

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Fenton

St. Peters

Wentzville

Alton

Farmington

Clayton

Edwardsville

Eureka

Festus

Glencoe

Litchfield

Shrewsbury

Why use momondo?

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.