OPO - STL

$803 Find Cheap Flights from Porto to St. Louis

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Porto to St. Louis departing on 5/16. 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

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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Flights Deals

Cheap Flight Deals 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.

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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Porto to St. Louis.
Discover the best prices for you by selecting your travel dates on KAYAK.
Air Canada Logo
6:00 am - 7:58 pmOPO-STL
19h 58m2 stops
Air Canada Logo
7:30 am - 11:30 amSTL-OPO
22h 00m2 stops
$803Air Canada
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Fri, May 16 - Tue, May 20
United Airlines Logo
12:35 pm - 11:08 amOPO-STL
28h 33m1 stop
United Airlines Logo
8:25 am - 9:45 amSTL-OPO
19h 20m2 stops
$1,053United Airlines
Find Deal
Fri, May 16 - Tue, May 20
Logo
8:40 am - 7:43 pmOPO-STL
17h 03m2 stops
Logo
7:30 am - 7:40 pmSTL-OPO
30h 10m3 stops
$1,246
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Fri, May 16 - Tue, May 20
United Airlines Logo
12:35 pm - 11:46 pmOPO-STL
17h 11m1 stop
United Airlines Logo
8:22 am - 9:45 amSTL-OPO
19h 23m1 stop
$1,290United Airlines
Find Deal
Fri, May 16 - Tue, May 20
Logo
8:40 am - 12:19 pmOPO-STL
33h 39m3 stops
Logo
7:30 am - 10:50 amSTL-OPO
21h 20m3 stops
$1,380
Find Deal
Fri, May 16 - Tue, May 20
Useful Info

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 Air Canada ($803) and United Airlines ($1,053).

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Good to know

Cheapest flight$803
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 $829 for a one-way ticket and $803 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.

  • Which airline alliances offer flights from Porto to St. Louis?

    Star Alliance is the only airline alliance operating flights between Porto and St. Louis.

  • 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

St. Louis (STL)
Porto (OPO)

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