$503 Find Cheap Flights from Portugal 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 to St. Louis departing on 9/21. 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

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 for flights 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 for flights to St. Louis, as well as popular online travel agencies
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Cheap Flights from Portugal to St. Louis

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portugal 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 Portugal to St. Louis

Sat, Aug 30 - Mon, Sep 8
United Airlines Logo
6:00 am - 12:25 pmOPO-STL
36h 25m2 stops
United Airlines Logo
6:15 am - 9:35 amSTL-OPO
21h 20m2 stops
$811United Airlines
Find Deal
Sat, Sep 20 - Sat, Oct 4
Lufthansa Logo
12:05 pm - 1:30 pmOPO-STL
31h 25m1 stop
Lufthansa Logo
12:25 pm - 11:15 amSTL-OPO
16h 50m2 stops
$869Lufthansa
Find Deal
Sat, Sep 20 - Sat, Oct 4
American Airlines Logo
8:15 am - 8:32 pmOPO-STL
18h 17m2 stops
American Airlines Logo
10:25 am - 11:40 amSTL-OPO
19h 15m2 stops
$901American Airlines
Find Deal
Sat, Aug 30 - Mon, Sep 8
 Logo
4:35 pm - 1:30 pmOPO-STL
26h 55m1 stop
 Logo
1:30 pm - 9:35 amSTL-OPO
14h 05m1 stop
Thu, Jun 26 - Mon, Jun 30
 Logo
6:00 am - 5:04 pmOPO-STL
41h 04m3 stops
 Logo
1:30 pm - 9:35 pmSTL-OPO
26h 05m3 stops
$1,076
Find Deal
Thu, Jun 26 - Mon, Jun 30
 Logo
6:00 am - 5:04 pmOPO-STL
41h 04m3 stops
 Logo
1:30 pm - 10:55 pmSTL-OPO
27h 25m2 stops
$1,116
Find Deal
Thu, Jun 26 - Mon, Jun 30
 Logo
1:30 pm - 5:04 pmOPO-STL
33h 34m3 stops
 Logo
2:30 pm - 3:55 pmSTL-OPO
19h 25m2 stops
$1,130
Find Deal
Thu, Jun 26 - Mon, Jun 30
British Airways Logo
8:15 am - 12:51 pmOPO-STL
34h 36m2 stops
British Airways Logo
4:23 pm - 7:50 pmSTL-OPO
21h 27m2 stops
$1,137British Airways
Find Deal
Thu, Jun 26 - Mon, Jun 30
United Airlines Logo
12:35 pm - 10:50 amOPO-STL
28h 15m1 stop
United Airlines Logo
6:00 am - 6:55 amSTL-OPO
18h 55m1 stop
$1,198United Airlines
Find Deal
Thu, Jun 26 - Mon, Jun 30
Delta Logo
6:30 am - 5:19 pmOPO-STL
16h 49m2 stops
Delta Logo
10:30 am - 3:35 pmSTL-OPO
23h 05m2 stops
$1,209Delta
Find Deal
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KAYAK's insights & trends for flights to St. Louis

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

How long is the flight to St. Louis?

The duration of your flight to St. Louis depends on your departure and arrival airports. Obviously, any flights that include a layover will also be longer. The most popular routes to St. Louis on KAYAK are from Lisbon, which takes 15h 23m, and Porto, which takes 18h 07m.

How many direct flights to St. Louis are there each day?

There are around 230 direct flights from within Portugal to St. Louis every day. Most flights depart in the morning, with 7:00 am the most common departure time and 46% of flights departing in the morning.


Good to know

Low seasonDecember
High seasonJanuary
Cheapest flight$503
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Lisbon to St. Louis

FAQs - booking St. Louis flights

  • How far is Lambert-St Louis Airport from central St. Louis?

    You’ll need to travel 13 miles to reach the St. Louis city center from Lambert-St Louis Airport.

  • What is the name of St. Louis’s airport?

    When flying to St. Louis, you'll arrive at Lambert-St Louis Airport (STL). The airport is also known as Lambert Field, Lambert-St Louis, St. Louis Lambert, or St. Louis Lambert Intl.

  • What is the cheapest day to fly to St. Louis?

    Based on KAYAK data, the cheapest day to fly to St. Louis is Monday where round-trip tickets can be as cheap as $898. On the other hand, the most expensive day to fly is Friday, where round-trip prices are $1,021 on average.

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

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

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

  • What is the Hacker Fare option on flights 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 with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight 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 up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to St. Louis?

    The cheapest time of day to fly to St. Louis is generally in the morning, when round-trip flights cost $898 on average. The most expensive time of day to fly to St. Louis is generally in the morning, which is peak travel time and where the average cost of a ticket is $898.

  • How many direct flights to St. Louis are there each week?

    Each week there are around 1,609 direct flights from within Portugal to St. Louis. The most common day for departures is Friday, with 16% of flights taking off on this day.

Top tips for finding cheap flights to St. Louis

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest St. Louis flight deals.

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

Information on the airport you'll fly into in St. Louis

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