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$637+ Cheap flights from Portugal 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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — STL
Apr 5 — Apr 121
Sat 4/5
Sat 4/12
1 adult, Economy
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Cheap flight deals from Portugal to St. Louis

Keep the following information in mind while searching for Portugal to St. Louis flight deals. Data was last updated March 31, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$730
(American Airlines)

One-way from

$637
(Cheapflightsfares)

Popular in

August

Cheapest in

December

Average price

$1,008
Provider with most accurate pricing for Lisbon Humberto Delgado-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Lisbon Humberto Delgado-Lambert-St Louis flights.
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From Portugal to Lambert-St Louis
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One-way flight from Portugal to Lambert-St Louis
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Highest demand for flights based on searches. 8% potential increase in price ($91 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Find flight deals from Portugal to St. Louis

Cheapest flights from Portugal to St. Louis
Explore the most affordable flight options available from Portugal to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 31, 2025.

This American Airlines deal was found by Cheapflights users on 3/31. 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.
Fri 5/28:25 amLIS - STL
2 stops18h 22mAmerican Airlines
Tue 5/65:12 amSTL - LIS
2 stops20h 33mAmerican Airlines
Deal found 3/31$730
This AirNGo deal was found by Cheapflights users on 3/31. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/211:05 amLIS - STL
1 stop16h 22mBritish Airways
Tue 5/67:30 pmSTL - LIS
2 stops21h 30mBritish Airways
Deal found 3/31$740
This United Airlines deal was found by Cheapflights users on 3/31. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/25:05 amLIS - STL
1 stop14h 25mUnited Airlines
Tue 5/68:22 amSTL - LIS
1 stop17h 58mUnited Airlines
Deal found 3/31$788

Cheapflights Fare Finder

Customize your flight search to find flights from Portugal 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 March 31, 2025.
Use the filters below to find and compare flights from Portugal to St. Louis that are best for you.

Fly from

Portugal

Fly to

St. Louis

Route

Depart

Return

Price

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 5/2

8:25 am-8:47 pm

2 stops18h 22m

Lambert-St Louis

Tue 5/6

5:12 am-7:45 am

2 stops20h 33m

$730

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 5/2

11:05 am-9:27 pm

1 stop16h 22m

Lambert-St Louis

Tue 5/6

7:30 pm-11:00 pm

2 stops21h 30m

$740

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 5/2

5:05 am-1:30 pm

1 stop14h 25m

Lambert-St Louis

Tue 5/6

8:22 am-8:20 am

1 stop17h 58m

$788

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 4/30

10:15 pm-11:33 pm

2 stops31h 18m

$637

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Fri 5/30

6:35 am-9:52 pm

2 stops21h 17m

$662

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 4/30

11:05 am-8:58 pm

1 stop15h 53m

$681

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 4/30

11:05 am-8:58 pm

1 stop15h 53m

$685

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 4/30

11:25 am-3:47 pm

3 stops34h 22m

$876

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sat 7/19

5:55 am-10:45 pm

2 stops22h 50m

$877

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Sun 7/20

4:30 pm-10:45 pm

2 stops36h 15m

$889

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 13 results
1
2

Best time to book a flight from Portugal to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Portugal 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.

Cheapflights Insights

Everything you need to know about your flight from Portugal to St. Louis

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated March 31, 2025.
Finnair
7.6
Good
1,267 reviews

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Rowland,Dec 2024

HEL - HKG

Finnair, a large European airline, have a very poor boarding practice whereby they collect every passenger waiting at the gate into an even smaller closed in area after checking passports (again) and boarding cards - then simply open the boarding causing a crowd crush as ALL passengers attempt to board all at once. Surely a more controllable method these days is to board via seat row numbers?
Finnair
7.6
Good
1,267 reviews
Finnair
7.6
Good
1,267 reviews

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Rowland,Dec 2024

HEL - HKG

Finnair, a large European airline, have a very poor boarding practice whereby they collect every passenger waiting at the gate into an even smaller closed in area after checking passports (again) and boarding cards - then simply open the boarding causing a crowd crush as ALL passengers attempt to board all at once. Surely a more controllable method these days is to board via seat row numbers?
United Airlines
7.4
Good
8,614 reviews
Finnair
7.6
Good
1,267 reviews

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Rowland,Dec 2024

HEL - HKG

Finnair, a large European airline, have a very poor boarding practice whereby they collect every passenger waiting at the gate into an even smaller closed in area after checking passports (again) and boarding cards - then simply open the boarding causing a crowd crush as ALL passengers attempt to board all at once. Surely a more controllable method these days is to board via seat row numbers?
Turkish Airlines
7.3
Good
3,748 reviews
Finnair
7.6
Good
1,267 reviews

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Rowland,Dec 2024

HEL - HKG

Finnair, a large European airline, have a very poor boarding practice whereby they collect every passenger waiting at the gate into an even smaller closed in area after checking passports (again) and boarding cards - then simply open the boarding causing a crowd crush as ALL passengers attempt to board all at once. Surely a more controllable method these days is to board via seat row numbers?
American Airlines
7.2
Good
10,000 reviews
Finnair
7.6
Good
1,267 reviews

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Rowland,Dec 2024

HEL - HKG

Finnair, a large European airline, have a very poor boarding practice whereby they collect every passenger waiting at the gate into an even smaller closed in area after checking passports (again) and boarding cards - then simply open the boarding causing a crowd crush as ALL passengers attempt to board all at once. Surely a more controllable method these days is to board via seat row numbers?
Aer Lingus
7.0
Good
1,061 reviews
Finnair
7.6
Good
1,267 reviews

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Comfort

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Rowland,Dec 2024

HEL - HKG

Finnair, a large European airline, have a very poor boarding practice whereby they collect every passenger waiting at the gate into an even smaller closed in area after checking passports (again) and boarding cards - then simply open the boarding causing a crowd crush as ALL passengers attempt to board all at once. Surely a more controllable method these days is to board via seat row numbers?

Related info for your journey

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

  • What airport do you fly into for flights to St. Louis from Portugal?

    Lambert-St Louis (STL) is the airport you will fly into if you book a flight from Portugal to St. Louis. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.

  • What are the cheapest airlines to fly from Portugal to St. Louis one-way?

    To fly one-way, consider booking your trip with Aer Lingus, which is currently one of the cheapest options available, starting at $637. Finnair flights start at $662 while deals on British Airways start at $681 one-way.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portugal 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.

  • What is the cheapest month to book a flight from Portugal to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Portugal to St. Louis (average of $311). Flying from Portugal to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Portugal?

Book flights to Portugal if you plan to visit one of these locations
Fenton
Maryland Heights
Fairview Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Glencoe
Alton
Farmington
Chesterfield

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Top airline flying from Portugal to St. Louis

Discover the top airline that operate flights from Portugal to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$820Average$898FlexibilityNo cancel feeOn-time71%
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