HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portugal

$332+ Cheap flights from St. Louis (STL) to Portugal

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 9/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LIS
ago. 12 — ago. 191
mar. 8/12
mar. 8/19
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Portugal with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from St. Louis to Portugal

Keep the following information in mind while searching for St. Louis to Portugal flight deals. Data was last updated agosto 7, 2025.

Round-trip from

$579
(United)

One-way from

$332
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$1,198
From Lambert-St Louis to Portugal
Search Deals
One-way flight from Lambert-St Louis to Portugal
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($274 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from St. Louis to Portugal

Cheapest flights from St. Louis to Portugal
Explore the most affordable flight options available from St. Louis to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 7, 2025.

This United deal was found by Cheapflights users on 8/5. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/264:05 pmSTL - LIS
1 stop10h 50mMultiple Airlines
vie. 12/1911:20 amLIS - STL
2 stops36h 34mMultiple Airlines
Deal found 8/5$578
This United deal was found by Cheapflights users on 8/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/1211:49 amSTL - OPO
1 stop15h 41mMultiple Airlines
mié. 11/196:00 amOPO - STL
1 stop13h 55mMultiple Airlines
Deal found 8/7$579
This Booking.com deal was found by Cheapflights users on 8/5. 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.
mar. 11/116:30 amSTL - LIS
2 stops20h 50mAir Canada
mar. 11/1811:20 amLIS - STL
2 stops34h 09mAir Canada
Deal found 8/5$584
This United Airlines deal was found by Cheapflights users on 8/7. 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.
mié. 11/129:00 amSTL - OPO
2 stops18h 30mUnited Airlines
mié. 11/196:00 amOPO - STL
1 stop13h 55mUnited Airlines
Deal found 8/7$584
This Booking.com deal was found by Cheapflights users on 8/5. 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.
mar. 11/116:30 amSTL - LIS
2 stops20h 50mMultiple Airlines
mar. 11/183:55 pmLIS - STL
1 stop28h 00mMultiple Airlines
Deal found 8/5$590
This Delta deal was found by Cheapflights users on 8/6. 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.
dom. 11/24:27 pmSTL - LIS
1 stop10h 33mDelta
mié. 11/1210:00 amLIS - STL
1 stop12h 40mDelta
Deal found 8/6$592
This Delta deal was found by Cheapflights users on 8/6. 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.
mié. 11/59:00 amSTL - LIS
2 stops17h 00mDelta
mié. 11/1210:00 amLIS - STL
1 stop12h 40mDelta
Deal found 8/6$597
This Air Canada deal was found by Cheapflights users on 8/6. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/25:24 pmSTL - LIS
2 stops33h 56mAir Canada
mar. 11/115:00 amLIS - STL
2 stops40h 29mAir Canada
Deal found 8/6$600
This Ovago deal was found by Cheapflights users on 8/7. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/191:43 pmSTL - LIS
2 stops16h 27mBritish Airways
lun. 11/246:45 pmLIS - STL
2 stops32h 10mBritish Airways
Deal found 8/7$601
This Iberia deal was found by Cheapflights users on 8/6. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/29:47 amSTL - LIS
2 stops28h 18mIberia
jue. 11/136:30 amLIS - STL
2 stops18h 57mIberia
Deal found 8/6$604
This Gurufare deal was found by Cheapflights users on 8/6. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/311:49 amSTL - LIS
1 stop14h 21mLufthansa
mar. 11/113:55 pmLIS - STL
1 stop28h 00mLufthansa
Deal found 8/6$607
This Gurufare deal was found by Cheapflights users on 8/6. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/311:49 amSTL - LIS
1 stop14h 21mLufthansa
dom. 11/95:00 amLIS - STL
1 stop14h 55mLufthansa
Deal found 8/6$611

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Portugal 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 agosto 7, 2025.
Use the filters below to find and compare flights from St. Louis to Portugal that are best for you.

Fly from

St. Louis

Fly to

Portugal

Route

Depart

Return

Price

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

mié. 11/26

4:05 pm-8:55 am

1 stop10h 50m

Lisbon Humberto Delgado

vie. 12/19

11:20 am-5:54 pm

2 stops36h 34m

$578

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mié. 11/12

11:49 am-9:30 am

1 stop15h 41m

Porto

mié. 11/19

6:00 am-1:55 pm

1 stop13h 55m

$579

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

sáb. 1/3

6:35 pm-9:20 am

2 stops32h 45m

Lisbon Humberto Delgado

vie. 1/16

5:00 am-1:55 pm

1 stop14h 55m

$583

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

mar. 11/11

6:30 am-9:20 am

2 stops20h 50m

Lisbon Humberto Delgado

mar. 11/18

11:20 am-3:29 pm

2 stops34h 09m

$584

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mié. 11/12

9:00 am-9:30 am

2 stops18h 30m

Porto

mié. 11/19

6:00 am-1:55 pm

1 stop13h 55m

$584

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

mar. 11/11

6:30 am-9:20 am

2 stops20h 50m

Lisbon Humberto Delgado

mar. 11/18

3:55 pm-1:55 pm

1 stop28h 00m

$590

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

dom. 11/2

4:27 pm-9:00 am

1 stop10h 33m

Lisbon Humberto Delgado

mié. 11/12

10:00 am-4:40 pm

1 stop12h 40m

$592

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

sáb. 1/3

6:35 pm-9:20 am

2 stops32h 45m

Lisbon Humberto Delgado

vie. 1/16

5:00 am-1:55 pm

1 stop14h 55m

$594

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

mié. 11/5

9:00 am-8:00 am

2 stops17h 00m

Lisbon Humberto Delgado

mié. 11/12

10:00 am-4:40 pm

1 stop12h 40m

$597

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

dom. 11/2

5:24 pm-9:20 am

2 stops33h 56m

Lisbon Humberto Delgado

mar. 11/11

5:00 am-3:29 pm

2 stops40h 29m

$600

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/5

Showing 1-10 of 31 results
1
2
3
4

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

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

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to Portugal (average of $612). Flying from St. Louis to Portugal in June is currently the most expensive (average of $1,128). 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.

What is the cheapest time of day to fly from STL to PT?

Find hourly flight availability from St. Louis to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated agosto 7, 2025.

When flying from St. Louis to Portugal, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. 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 Portugal. Reviews last updated agosto 7, 2025.
Read through reviews of airlines operating flights from St. Louis to Portugal, such as Delta, KLM, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

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
7,987 reviews
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

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
1,382 reviews
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

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
8,916 reviews
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

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
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

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!
Air Canada
7.1
Good
9,899 reviews
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

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 St. Louis to Portugal. 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 from for flights from St. Louis to Portugal?

    Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly out of when you book flights from St. Louis to Portugal.

  • What are the most popular routes from St. Louis to Portugal?

    When deciding which route to take from St. Louis to Portugal consider Lambert-St Louis - Lisbon Humberto Delgado, Lambert-St Louis - Porto or Lambert-St Louis - Lajes as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Portugal 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 St. Louis to Portugal?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Portugal (average of $612). Flying from St. Louis to Portugal in June is currently the most expensive (average of $1,128). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Frankfurt flights
St. Louis to Heathrow flights
Kansas City to Heathrow flights
Kansas City to Dublin flights
St. Louis to Vicenza flights
St. Louis to Gatwick flights
Kansas City to Leonardo da Vinci/Fiumicino flights
St. Louis to Malpensa flights
Kansas City to Gatwick flights
St. Louis to Leonardo da Vinci/Fiumicino flights
St. Louis to Linate flights
St. Louis to Lisbon flights
Kansas City to Amsterdam flights
St. Louis to Seville flights
St. Louis to Dublin flights
Kansas City to Charles de Gaulle flights
St. Louis to Zurich flights
Kansas City to Athens flights
St. Louis to Charles de Gaulle flights
Kansas City to Frankfurt flights
St. Louis to Athens flights
St. Louis to Edinburgh flights
St. Louis to Bergamo flights
St. Louis to Munich flights
St. Louis to London City flights
St. Louis to Istanbul flights
Kansas City to Orly flights
St. Louis to Madrid flights
Kansas City to Lisbon flights
Kansas City to London City flights
Kansas City to Keflavik Intl flights
Kansas City to Madrid flights
St. Louis to Orly flights
St. Louis to Sarajevo flights
Kansas City to Barcelona-El Prat flights
St. Louis to Keflavik Intl flights
St. Louis to Barcelona-El Prat flights
St. Louis to Bruxelles-National flights
Kansas City to Vicenza flights
Kansas City to Munich flights
St. Louis to Sabiha Gokcen flights
Kansas City to Naples flights
Kansas City to Zurich flights
St. Louis to Amsterdam flights
Kansas City to Duesseldorf Intl flights
Kansas City to Malpensa flights
St. Louis to Florence flights
St. Louis to Stansted flights
Kansas City to Edinburgh flights
Kansas City to Linate flights

Top 7 airlines flying from St. Louis to Portugal

Discover the top 7 airlines that operate flights from St. Louis to Portugal. 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 agosto 7, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$568Average$761FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$602Average$1,109FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$612Average$1,125FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$614Average$1,076FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$642Average$853FlexibilityNo cancel feeOn-time70%
DeltaCheapest$652Average$924FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$823Average$1,093FlexibilityNo cancel feeOn-time67%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.