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Portugal

$388+ 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 5/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LIS
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$810
(Air Canada)

One-way from

$608
(American Airlines)

Popular in

June

Cheapest in

November

Average price

$905
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 ($333 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($46 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 17, 2025.

This United Airlines deal was found by Cheapflights users on 4/17. 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.
Mon 11/248:25 amSTL - LIS
1 stop19h 50mUnited Airlines
Tue 12/211:00 amLIS - STL
2 stops33h 18mUnited Airlines
Deal found 4/17$609
This Air Canada deal was found by Cheapflights users on 4/17. 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
2 stops35h 05mAir Canada
Tue 12/211:00 amLIS - STL
2 stops34h 21mAir Canada
Deal found 4/17$611
This Delta deal was found by Cheapflights users on 4/17. 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 11/268:50 amSTL - LIS
2 stops18h 10mDelta
Wed 12/311:15 amLIS - STL
2 stops15h 34mDelta
Deal found 4/17$648
This FlightHub deal was found by Cheapflights users on 4/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/263:45 pmSTL - LIS
1 stop13h 55mLufthansa
Tue 12/23:55 pmLIS - STL
1 stop28h 00mLufthansa
Deal found 4/17$666
This KAYAK deal was found by Cheapflights users on 4/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2511:20 amSTL - LIS
2 stops18h 45mBritish Airways
Mon 12/18:45 pmLIS - STL
2 stops25h 24mBritish Airways
Deal found 4/17$759
This Air Canada deal was found by Cheapflights users on 4/16. 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.
Sat 10/184:05 pmSTL - LIS
2 stops35h 15mMultiple Airlines
Sat 11/15:00 amLIS - STL
2 stops40h 26mMultiple Airlines
Deal found 4/16$764
This Iberia deal was found by Cheapflights users on 4/17. 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.
Tue 11/252:49 pmSTL - LIS
1 stop12h 26mIberia
Mon 12/18:45 pmLIS - STL
2 stops30h 56mIberia
Deal found 4/17$787
This Air Canada deal was found by Cheapflights users on 4/16. 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.
Wed 5/72:30 pmSTL - OPO
2 stops22h 00mMultiple Airlines
Wed 5/146:00 amOPO - STL
2 stops19h 58mMultiple Airlines
Deal found 4/16$810
This Delta deal was found by Cheapflights users on 4/16. 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.
Sat 5/105:17 pmSTL - OPO
2 stops35h 23mDelta
Fri 5/236:40 amOPO - STL
2 stops22h 58mDelta
Deal found 4/16$822
This American Airlines deal was found by Cheapflights users on 4/16. 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 12/42:44 pmSTL - LIS
1 stop12h 21mAmerican Airlines
Sun 12/2110:45 amLIS - STL
2 stops17h 17mAmerican Airlines
Deal found 4/16$844
This United Airlines deal was found by Cheapflights users on 4/16. 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 9/179:17 amSTL - OPO
2 stops18h 08mUnited Airlines
Sun 9/2111:20 amOPO - STL
1 stop14h 37mUnited Airlines
Deal found 4/16$852
This Air Canada deal was found by Cheapflights users on 4/16. 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.
Wed 9/179:17 amSTL - OPO
2 stops18h 08mAir Canada
Sun 9/2111:20 amOPO - STL
2 stops14h 13mAir Canada
Deal found 4/16$858

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 April 17, 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

Wed 10/8

12:28 pm-9:20 am

2 stops14h 52m

Lisbon Humberto Delgado

Tue 10/14

11:25 am-3:38 pm

2 stops34h 13m

$791

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Wed 10/8

4:05 pm-11:10 am

1 stop13h 05m

Lisbon Humberto Delgado

Tue 10/14

11:25 am-2:19 pm

2 stops32h 54m

$793

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 5/7

2:30 pm-6:30 pm

2 stops22h 00m

Porto

Wed 5/14

6:00 am-7:58 pm

2 stops19h 58m

$810

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sat 5/10

5:17 pm-10:40 am

2 stops35h 23m

Porto

Fri 5/23

6:40 am-11:38 pm

2 stops22h 58m

$822

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Mon 5/12

4:52 pm-11:10 pm

2 stops24h 18m

Lisbon Humberto Delgado

Mon 5/19

8:45 pm-8:58 pm

2 stops30h 13m

$839

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 9/23

4:17 pm-4:05 pm

2 stops17h 48m

Lisbon Humberto Delgado

Mon 10/6

8:45 pm-8:01 pm

2 stops29h 16m

$840

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 9/17

9:17 am-9:25 am

2 stops18h 08m

Porto

Sun 9/21

11:20 am-7:57 pm

1 stop14h 37m

$852

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 9/17

9:17 am-9:25 am

2 stops18h 08m

Porto

Sun 9/21

11:20 am-7:33 pm

2 stops14h 13m

$858

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Fri 8/22

1:30 pm-9:00 am

2 stops37h 30m

Lisbon Humberto Delgado

Fri 8/29

6:25 pm-11:39 pm

2 stops35h 14m

$877

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Mon 5/12

12:15 pm-2:45 pm

3 stops20h 30m

Lisbon Humberto Delgado

Mon 5/19

12:15 pm-4:45 pm

3 stops34h 30m

$900

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 26 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 $1,203). 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 April 17, 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 April 17, 2025.
To help decide which airline to fly from St. Louis to Portugal, see what other customers have to say about Delta, KLM and United Airlines. 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
7,916 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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
1,327 reviews
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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
8,667 reviews
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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.
Scandinavian Airlines
7.3
Good
1,335 reviews
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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 $610 and $628 on Air Canada and Aer Lingus, 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 $1,203). 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$566Average$806FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$600Average$1,079FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$601Average$1,109FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$618Average$1,121FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$625Average$925FlexibilityNo cancel feeOn-time70%
DeltaCheapest$680Average$1,063FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$779Average$1,092FlexibilityNo cancel feeOn-time67%

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