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St. Louis

$410+ 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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — STL
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
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 June 30, 2025.

Round-trip from

$804
(American Airlines)

One-way from

$410
(Kiwi.com)

Popular in

August

Cheapest in

December

Average price

$823
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. 10% potential increase in price ($115 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 30, 2025.

This American Airlines deal was found by Cheapflights users on 6/27. 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.
Thu 12/410:55 amLIS - STL
2 stops18h 39mAmerican Airlines
Mon 12/86:29 pmSTL - LIS
2 stops18h 26mAmerican Airlines
Deal found 6/27$804
This Lufthansa deal was found by Cheapflights users on 6/27. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/43:45 pmLIS - STL
1 stop28h 10mLufthansa
Mon 12/81:00 pmSTL - LIS
1 stop15h 15mLufthansa
Deal found 6/27$851
This British Airways deal was found by Cheapflights users on 6/30. 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.
Wed 7/168:20 pmOPO - STL
2 stops28h 48mBritish Airways
Sun 7/204:52 pmSTL - OPO
2 stops21h 28mBritish Airways
Deal found 6/30$1,048
This Delta deal was found by Cheapflights users on 6/29. 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.
Wed 7/306:15 amOPO - STL
2 stops20h 21mDelta
Wed 8/62:15 pmSTL - OPO
2 stops19h 15mDelta
Deal found 6/29$1,069
This Mytrip deal was found by Cheapflights users on 6/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/138:50 amLIS - STL
3 stops34h 42mMultiple Airlines
Wed 8/201:30 pmSTL - LIS
2 stops22h 20mMultiple Airlines
Deal found 6/29$1,117
This Flighttix deal was found by Cheapflights users on 6/30. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1411:05 amLIS - STL
1 stop15h 42mIberia
Thu 8/211:15 pmSTL - LIS
1 stop13h 50mIberia
Deal found 6/30$1,156
This British Airways deal was found by Cheapflights users on 6/29. 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.
Wed 8/1311:05 amLIS - STL
1 stop15h 42mBritish Airways
Wed 8/201:15 pmSTL - LIS
1 stop13h 50mBritish Airways
Deal found 6/29$1,161
This Air France deal was found by Cheapflights users on 6/28. 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.
Mon 7/146:30 amOPO - STL
2 stops20h 06mMultiple Airlines
Fri 7/187:11 pmSTL - OPO
2 stops16h 59mMultiple Airlines
Deal found 6/28$1,171
This United Airlines deal was found by Cheapflights users on 6/30. 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.
Wed 7/166:00 amOPO - STL
2 stops18h 07mUnited Airlines
Sun 7/205:00 pmSTL - OPO
1 stop10h 45mUnited Airlines
Deal found 6/30$1,205
This American Airlines deal was found by Cheapflights users on 6/28. 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.
Tue 8/128:15 amOPO - STL
2 stops17h 06mAmerican Airlines
Tue 8/191:24 pmSTL - OPO
2 stops16h 16mAmerican Airlines
Deal found 6/28$1,221
This Booking.com deal was found by Cheapflights users on 6/28. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/2912:55 pmLIS - STL
1 stop29h 41mAir Canada
Thu 7/36:33 amSTL - LIS
2 stops20h 47mAir Canada
Deal found 6/28$1,394
This United Airlines deal was found by Cheapflights users on 6/28. 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.
Sun 6/2912:55 pmLIS - STL
1 stop12h 45mUnited Airlines
Wed 7/96:33 amSTL - LIS
2 stops21h 57mUnited Airlines
Deal found 6/28$1,398

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 June 30, 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

Thu 12/4

10:55 am-11:34 pm

2 stops18h 39m

Lambert-St Louis

Mon 12/8

6:29 pm-6:55 pm

2 stops18h 26m

$804

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 12/4

3:45 pm-1:55 pm

1 stop28h 10m

Lambert-St Louis

Mon 12/8

1:00 pm-10:15 am

1 stop15h 15m

$851

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 7/16

8:20 pm-7:08 pm

2 stops28h 48m

Lambert-St Louis

Sun 7/20

4:52 pm-8:20 pm

2 stops21h 28m

$1,048

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 7/30

6:15 am-8:36 pm

2 stops20h 21m

Lambert-St Louis

Wed 8/6

2:15 pm-3:30 pm

2 stops19h 15m

$1,069

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 8/13

8:50 am-1:32 pm

3 stops34h 42m

Lambert-St Louis

Wed 8/20

1:30 pm-5:50 pm

2 stops22h 20m

$1,117

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 8/14

11:05 am-8:47 pm

1 stop15h 42m

Lambert-St Louis

Thu 8/21

1:15 pm-9:05 am

1 stop13h 50m

$1,156

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Wed 8/13

11:05 am-8:47 pm

1 stop15h 42m

Lambert-St Louis

Wed 8/20

1:15 pm-9:05 am

1 stop13h 50m

$1,161

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Mon 7/14

6:30 am-8:36 pm

2 stops20h 06m

Lambert-St Louis

Fri 7/18

7:11 pm-6:10 pm

2 stops16h 59m

$1,171

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 7/16

6:00 am-6:07 pm

2 stops18h 07m

Lambert-St Louis

Sun 7/20

5:00 pm-9:45 am

1 stop10h 45m

$1,205

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Tue 8/12

8:15 am-7:21 pm

2 stops17h 06m

Lambert-St Louis

Tue 8/19

1:24 pm-11:40 am

2 stops16h 16m

$1,221

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/27

Showing 1-10 of 26 results
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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
No data available for this route at this time. Please check back soon.

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 June 30, 2025.
See what other customers who have flown with Delta, KLM, and United Airlines from Portugal to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,969 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,969 reviews
Delta
8.0
Very good
7,969 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,366 reviews
Delta
8.0
Very good
7,969 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,852 reviews
Delta
8.0
Very good
7,969 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Scandinavian Airlines
7.3
Good
1,413 reviews
Delta
8.0
Very good
7,969 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,969 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 $607. Lufthansa flights start at $704 while deals on American Airlines start at $730 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
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Festus
Chesterfield
Farmington

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