OPO - STL

$367 Find Cheap Flights from Porto to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Porto to St. Louis departing on 3/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to St. Louis, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$767
Iberia
Wed 3/4Wed 3/11
OPO - STL • 2 stops
Cheapest one-way
$367
Multiple Airlines
Wed 3/11
OPO - STL • 2 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Porto to St. Louis (OPO-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Porto to St. Louis

Wed, Mar 4 - Wed, Mar 11
Iberia Logo
8:20 am - 6:00 pm
OPO
-
STL
15h 40m
2 stops
Iberia Logo
2:00 pm - 8:00 pm
STL
-
OPO
25h 00m
2 stops
$767Iberia
Tue, Mar 3 - Wed, Mar 11
Iberia Logo
8:20 am - 5:58 pm
OPO
-
STL
15h 38m
2 stops
Iberia Logo
2:00 pm - 8:00 pm
STL
-
OPO
25h 00m
2 stops
$802Iberia
Wed, Mar 4 - Wed, Mar 11
Lufthansa Logo
6:00 am - 1:55 pm
OPO
-
STL
13h 55m
1 stop
Lufthansa Logo
7:00 pm - 10:25 pm
STL
-
OPO
22h 25m
2 stops
$857Lufthansa
Thu, Feb 12 - Mon, Feb 16
Lufthansa Logo
6:00 am - 5:44 pm
OPO
-
STL
17h 44m
2 stops
Lufthansa Logo
11:39 am - 12:50 pm
STL
-
OPO
19h 11m
2 stops
$868Lufthansa
Tue, Mar 3 - Wed, Mar 11
Lufthansa Logo
12:30 pm - 1:55 pm
OPO
-
STL
31h 25m
1 stop
Lufthansa Logo
5:41 pm - 3:25 pm
STL
-
OPO
16h 44m
2 stops
$882Lufthansa
Wed, Mar 4 - Wed, Mar 11
United Airlines Logo
6:00 am - 1:55 pm
OPO
-
STL
13h 55m
1 stop
United Airlines Logo
4:50 pm - 11:40 am
STL
-
OPO
13h 50m
1 stop
$900United Airlines
Tue, Mar 3 - Wed, Mar 11
Lufthansa Logo
4:15 pm - 1:55 pm
OPO
-
STL
27h 40m
1 stop
Lufthansa Logo
4:50 pm - 11:40 am
STL
-
OPO
13h 50m
1 stop
$957Lufthansa
Thu, Feb 12 - Mon, Feb 16
Multiple Airlines Logo
11:10 am - 12:21 pm
OPO
-
STL
31h 11m
3 stops
Multiple Airlines Logo
4:05 pm - 2:55 pm
STL
-
OPO
16h 50m
2 stops
$1,608Multiple Airlines
Thu, Feb 12 - Mon, Feb 16
Multiple Airlines Logo
11:10 am - 3:29 pm
OPO
-
STL
34h 19m
3 stops
Multiple Airlines Logo
8:17 am - 1:05 pm
STL
-
OPO
22h 48m
3 stops
$1,809Multiple Airlines
Booking Insights

KAYAK's insights & trends for Porto to St. Louis flights

Get data-powered insights and trends into flights from Porto to St. Louis to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Porto to St. Louis?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Porto to St. Louis were found on Iberia ($767) and Lufthansa ($857).

Find deals

Good to know

Cheapest flight$367
Flight from Porto to St. Louis

When to book flights from Porto to St. Louis

Are your dates flexible? Find out the best times to travel from Porto to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Porto to St. Louis

  • What is the cheapest flight from Porto to St. Louis?

    In the last 3 days, the lowest price for a flight from Porto to St. Louis was $367 for a one-way ticket and $767 for a round-trip.

  • Do I need a passport to fly between Porto and St. Louis?

    Yes, you’ll need a passport to travel to St. Louis from Porto.

  • Which aircraft models fly most regularly from Porto to St. Louis?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Porto to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Porto to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Porto is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Porto to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Porto with another airline. Booking your flights between Porto and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Porto up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight from Porto to St. Louis

Information on your arrival and departure airports

Porto (OPO)
St. Louis (STL)