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St. Louis

$527+ Cheap flights from Porto (OPO) to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/2. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — STL
feb. 13 — feb. 201
vie. 2/13
vie. 2/20
1 adult, Economy
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Cheap flight deals from Porto to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Porto (OPO) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated enero 14, 2026.

Round-trip from

$736
(American Airlines)

One-way from

$527
(Kiwi.com)
From Porto to Lambert-St Louis
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One-way flight from Porto to Lambert-St Louis
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Find flight deals from Porto to St. Louis

Cheapest flights from Porto to St. Louis
Explore the most affordable flight options available from Porto to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 14, 2026.

This American Airlines deal was found by Cheapflights users on 1/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 1/288:20 am
OPO
-
STL
2 stops30h 43m
American Airlines
dom. 2/112:01 pm
STL
-
OPO
2 stops21h 59m
American Airlines
Deal found 1/11$736
This British Airways deal was found by Cheapflights users on 1/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/48:20 am
OPO
-
STL
2 stops20h 24m
Multiple Airlines
mié. 2/1112:03 pm
STL
-
OPO
2 stops17h 42m
Multiple Airlines
Deal found 1/13$743
This American Airlines deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/48:20 am
OPO
-
STL
2 stops20h 24m
American Airlines
mié. 2/1110:17 am
STL
-
OPO
2 stops15h 23m
American Airlines
Deal found 1/12$747
This Delta deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 1/146:00 am
OPO
-
STL
2 stops20h 43m
Delta
mié. 1/2110:19 am
STL
-
OPO
2 stops18h 11m
Delta
Deal found 1/12$980
This Air France deal was found by Cheapflights users on 1/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 1/144:10 pm
OPO
-
STL
2 stops30h 27m
Multiple Airlines
mié. 1/219:59 am
STL
-
OPO
2 stops18h 31m
Multiple Airlines
Deal found 1/13$983
This FlightHub deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 1/144:05 pm
OPO
-
STL
2 stops37h 54m
Lufthansa
mié. 1/213:50 pm
STL
-
OPO
1 stop13h 50m
Lufthansa
Deal found 1/12$1,132
This Air Canada deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 1/148:55 am
OPO
-
STL
3 stops20h 03m
Air Canada
mié. 1/214:05 pm
STL
-
OPO
2 stops19h 25m
Air Canada
Deal found 1/12$1,250

Cheapflights Fare Finder

 
Customize your flight search to find flights from Porto to St. Louis 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, Cheapflights users made 2,558,603 searches. Data last updated enero 14, 2026.
Use the filters below to find and compare flights from Porto to St. Louis that are best for you.

Fly from

Porto

Fly to

St. Louis

Route

Depart

Return

Price

PortoSt. Louis

OPO - STL

OPOSTL

Porto

mié. 1/28

8:20 am-9:03 am

2 stops30h 43m

Lambert-St Louis

dom. 2/1

12:01 pm-4:00 pm

2 stops21h 59m

$736

PortoSt. Louis

OPO - STL

OPOSTL

Porto

mié. 2/4

8:20 am-10:44 pm

2 stops20h 24m

Lambert-St Louis

mié. 2/11

12:03 pm-11:45 am

2 stops17h 42m

$743

PortoSt. Louis

OPO - STL

OPOSTL

Porto

mié. 2/4

8:20 am-10:44 pm

2 stops20h 24m

Lambert-St Louis

mié. 2/11

10:17 am-7:40 am

2 stops15h 23m

$747

PortoSt. Louis

OPO - STL

OPOSTL

Porto

sáb. 5/2

10:05 pm-11:59 pm

3 stops55h 54m

$527

PortoSt. Louis

OPO - STL

OPOSTL

Porto

jue. 5/28

8:20 am-8:26 pm

2 stops18h 06m

$540

PortoSt. Louis

OPO - STL

OPOSTL

Porto

dom. 5/3

7:45 am-3:50 pm

3 stops38h 05m

$543

PortoSt. Louis

OPO - STL

OPOSTL

Porto

jue. 5/28

7:15 am-11:57 pm

3 stops46h 42m

$552

PortoSt. Louis

OPO - STL

OPOSTL

Porto

dom. 5/3

8:20 am-11:48 pm

2 stops21h 28m

$568

PortoSt. Louis

OPO - STL

OPOSTL

Porto

jue. 5/28

7:55 pm-7:30 pm

1 stop29h 35m

$664

PortoSt. Louis

OPO - STL

OPOSTL

Porto

dom. 5/3

12:35 pm-7:48 pm

1 stop13h 13m

$941

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

Showing 1-10 of 11 results
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Best time to book a flight from Porto to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Porto with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Porto to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Porto to St. Louis?

    Airlines like American Airlines fly from Porto to St. Louis in about 30h 43m. The time it takes to get you to your destination can typically vary by up to . There are 4154 mi between Porto and St. Louis.

  • Can I find deals for flights from Porto to St. Louis that include hotel bookings?

    Yes. In addition to deals on Porto to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Porto to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Porto to St. Louis.

  • Can I find deals for business class flights from Porto to St. Louis?

    Yes. Cheapflights offers flight deals from Porto to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
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Fairview Heights
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Glencoe
Chesterfield
Alton
Farmington
Festus

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