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Portugal

$608+ 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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LIS
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
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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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$826
(Air France)

One-way from

$608
(American Airlines)

Popular in

June

Cheapest in

November

Average price

$852
Provider with most accurate pricing for Lambert-St Louis-Lisbon Humberto Delgado flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Lisbon Humberto Delgado flights.
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From Lambert-St Louis to Portugal
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One-way flight from Lambert-St Louis to Portugal
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Highest demand for flights based on searches. 25% potential increase in price ($324 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($43 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 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 March 28, 2025.

This Air Canada deal was found by Cheapflights users on 3/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/244:15 pmSTL - LIS
1 stop11h 05mAir Canada
Wed 12/311:00 amLIS - STL
2 stops33h 18mAir Canada
Deal found 3/27$626
This Finnair deal was found by Cheapflights users on 3/27. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/192:49 pmSTL - LIS
1 stop12h 16mMultiple Airlines
Wed 11/2611:15 amLIS - STL
1 stop15h 01mMultiple Airlines
Deal found 3/27$631
This United Airlines deal was found by Cheapflights users on 3/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/161:00 pmSTL - LIS
1 stop15h 15mUnited Airlines
Thu 11/2711:55 amLIS - STL
1 stop12h 38mUnited Airlines
Deal found 3/27$641
This Air France deal was found by Cheapflights users on 3/27. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2611:51 amSTL - LIS
2 stops15h 09mAir France
Wed 12/310:00 amLIS - STL
2 stops16h 47mAir France
Deal found 3/27$642
This United Airlines deal was found by Cheapflights users on 3/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:15 amSTL - OPO
2 stops21h 30mUnited Airlines
Wed 11/56:00 amOPO - STL
2 stops20h 59mUnited Airlines
Deal found 3/27$643
This Delta deal was found by Cheapflights users on 3/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/162:18 pmSTL - LIS
2 stops12h 42mDelta
Fri 11/2811:15 amLIS - STL
2 stops18h 24mDelta
Deal found 3/27$646
This Lufthansa deal was found by Cheapflights users on 3/27. 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.
Sun 11/163:45 pmSTL - LIS
1 stop17h 20mLufthansa
Wed 11/265:00 amLIS - STL
1 stop14h 55mLufthansa
Deal found 3/27$655
This Delta deal was found by Cheapflights users on 3/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/193:30 pmSTL - OPO
2 stops18h 00mDelta
Mon 11/311:15 amOPO - STL
2 stops36h 40mDelta
Deal found 3/27$656
This Lufthansa deal was found by Cheapflights users on 3/27. 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.
Sun 10/193:30 pmSTL - OPO
1 stop18h 10mLufthansa
Thu 11/64:30 pmOPO - STL
1 stop27h 25mLufthansa
Deal found 3/27$665
This Air Canada deal was found by Cheapflights users on 3/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/194:05 pmSTL - OPO
2 stops20h 10mAir Canada
Sat 11/88:40 amOPO - STL
2 stops36h 46mAir Canada
Deal found 3/27$700
This KLM deal was found by Cheapflights users on 3/27. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1511:51 amSTL - LIS
2 stops16h 54mKLM
Thu 10/2312:45 pmLIS - STL
2 stops16h 54mKLM
Deal found 3/27$727
This Iberia deal was found by Cheapflights users on 3/26. 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.
Wed 10/1511:46 amSTL - LIS
2 stops18h 04mIberia
Wed 10/298:45 pmLIS - STL
2 stops28h 16mIberia
Deal found 3/26$747

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 March 28, 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. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 5/7

5:45 pm-3:30 pm

2 stops15h 45m

Porto

Wed 5/14

6:20 am-8:49 pm

2 stops20h 29m

$826

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 9/19

9:17 am-6:50 am

2 stops15h 33m

Porto

Thu 9/25

12:10 pm-2:18 pm

2 stops32h 08m

$842

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 4/25

7:01 pm-10:15 pm

2 stops21h 14m

Porto

Mon 4/28

11:25 am-4:26 pm

2 stops35h 01m

$891

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Thu 4/17

6:00 pm-11:00 pm

2 stops23h 00m

Lisbon Humberto Delgado

Thu 4/24

11:05 am-11:33 pm

2 stops18h 28m

$901

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Mon 8/25

1:30 pm-8:40 pm

2 stops25h 10m

Lisbon Humberto Delgado

Mon 9/1

7:15 am-11:39 pm

2 stops22h 24m

$928

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 8/5

1:16 pm-9:05 am

1 stop13h 49m

Lisbon Humberto Delgado

Tue 8/12

11:05 am-8:13 pm

1 stop15h 08m

$956

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 9/19

5:30 pm-11:20 pm

2 stops23h 50m

Porto

Sat 9/27

12:05 pm-3:21 pm

2 stops33h 16m

$958

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sun 8/3

1:30 pm-9:20 am

1 stop13h 50m

Lisbon Humberto Delgado

Tue 8/12

11:25 am-12:27 pm

2 stops31h 02m

$969

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 8/5

11:25 am-9:20 am

2 stops15h 55m

Lisbon Humberto Delgado

Tue 8/12

11:25 am-12:27 pm

2 stops31h 02m

$973

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Thu 4/24

4:05 pm-5:05 pm

2 stops19h 00m

Porto

Fri 5/2

5:55 pm-11:36 pm

2 stops35h 41m

$976

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 27 results
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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 $1,213). 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 March 28, 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.

Rainfall in Portugal by month

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

In terms of precipitation, rainfall in Portugal ranges from 0.2 - 4.8 inches per month. December is typically the wettest month, when rainfall can reach 4.8 in. July is typically the driest time to visit Portugal when rainfall is around 0.2 in.

Temperature in Portugal by month

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

If weather is an important factor for your trip to Portugal, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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 March 28, 2025.
To help decide which airline to fly from St. Louis to Portugal, see what other customers have to say about Delta, KLM and Finnair. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,897 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,321 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.4
Good
1,424 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,603 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 cheapest airlines to fly from St. Louis to Portugal one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $608. Users have also found prices from $612 and $671 on British Airways and Finnair, respectively.

  • 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 $1,213). 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

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Alternative routes for St. Louis to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
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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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$566Average$806FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$600Average$1,074FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$601Average$937FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$618Average$1,082FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$625Average$925FlexibilityNo cancel feeOn-time70%
DeltaCheapest$680Average$1,073FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$779Average$1,084FlexibilityNo cancel feeOn-time67%
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