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$348+ 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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LIS
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$571
(CheapOair)

One-way from

$348
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$670
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 ($330 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 20, 2025.

This CheapOair deal was found by Cheapflights users on 2/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/13:53 pmSTL - LIS
2 stops25h 07mMultiple Airlines
Tue 4/86:35 amLIS - STL
2 stops18h 54mMultiple Airlines
Deal found 2/19$571
This CheapOair deal was found by Cheapflights users on 2/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/15:55 amSTL - LIS
2 stops26h 30mBritish Airways
Tue 4/811:05 amLIS - STL
1 stop15h 53mBritish Airways
Deal found 2/19$572
This United Airlines deal was found by Cheapflights users on 2/20. 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.
Tue 4/111:00 amSTL - LIS
2 stops17h 30mUnited Airlines
Tue 4/811:25 amLIS - STL
3 stops34h 22mUnited Airlines
Deal found 2/20$581
This Expedia deal was found by Cheapflights users on 2/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/253:50 pmSTL - OPO
2 stops16h 00mMultiple Airlines
Mon 3/314:35 pmOPO - STL
2 stops52h 14mMultiple Airlines
Deal found 2/20$585
This United deal was found by Cheapflights users on 2/19. 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.
Sun 3/163:50 pmSTL - OPO
2 stops38h 45mUnited Airlines
Mon 3/2412:25 pmOPO - STL
2 stops30h 58mUnited Airlines
Deal found 2/19$641
This Cheapflightsfares deal was found by Cheapflights users on 2/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/235:35 pmSTL - LIS
2 stops22h 30mLufthansa
Wed 4/306:15 amLIS - STL
2 stops22h 52mLufthansa
Deal found 2/20$787
This Air Canada deal was found by Cheapflights users on 2/20. 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 4/203:30 pmSTL - LIS
2 stops35h 50mAir Canada
Tue 4/2911:25 amLIS - STL
2 stops33h 24mAir Canada
Deal found 2/20$810
This SmartFares deal was found by Cheapflights users on 2/19. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/242:02 pmSTL - LIS
1 stop14h 03mIberia
Sun 3/306:35 amLIS - STL
2 stops20h 06mIberia
Deal found 2/19$870
This Delta deal was found by Cheapflights users on 2/20. 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.
Fri 4/115:35 pmSTL - OPO
2 stops16h 00mDelta
Sun 4/205:00 amOPO - STL
2 stops17h 52mDelta
Deal found 2/20$1,038
This KAYAK deal was found by Cheapflights users on 2/19. 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.
Sat 10/45:18 pmSTL - OPO
2 stops40h 22mLufthansa
Sat 10/114:35 pmOPO - STL
1 stop26h 55mLufthansa
Deal found 2/19$1,098
This American Airlines deal was found by Cheapflights users on 2/19. 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.
Sat 10/411:38 amSTL - OPO
2 stops18h 02mAmerican Airlines
Sat 10/118:15 amOPO - STL
2 stops16h 52mAmerican Airlines
Deal found 2/19$1,168
This Iberia deal was found by Cheapflights users on 2/19. 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 4/26:29 pmSTL - OPO
2 stops19h 26mIberia
Wed 4/98:15 amOPO - STL
2 stops21h 18mIberia
Deal found 2/19$3,759

Find flights from St. Louis to Portugal within your budget

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 February 20, 2025.

Fly from

St. Louis

Fly to

Portugal

Route

Depart

Return

Price

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 4/1

3:53 pm-11:00 pm

2 stops25h 07m

Lisbon Humberto Delgado

Tue 4/8

6:35 am-7:29 pm

2 stops18h 54m

$571

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 4/1

5:55 am-2:25 pm

2 stops26h 30m

Lisbon Humberto Delgado

Tue 4/8

11:05 am-8:58 pm

1 stop15h 53m

$572

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 4/1

11:00 am-10:30 am

2 stops17h 30m

Lisbon Humberto Delgado

Tue 4/8

11:25 am-3:47 pm

3 stops34h 22m

$581

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 3/25

3:50 pm-12:50 pm

2 stops16h 00m

Porto

Mon 3/31

4:35 pm-2:49 pm

2 stops52h 14m

$585

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 3/16

3:50 pm-11:35 am

2 stops38h 45m

Porto

Mon 3/24

12:25 pm-2:23 pm

2 stops30h 58m

$641

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Wed 4/23

5:35 pm-10:05 pm

2 stops22h 30m

Lisbon Humberto Delgado

Wed 4/30

6:15 am-11:07 pm

2 stops22h 52m

$787

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sun 4/20

3:30 pm-9:20 am

2 stops35h 50m

Lisbon Humberto Delgado

Tue 4/29

11:25 am-2:49 pm

2 stops33h 24m

$810

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Mon 3/24

2:02 pm-9:05 am

1 stop14h 03m

Lisbon Humberto Delgado

Sun 3/30

6:35 am-8:41 pm

2 stops20h 06m

$870

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 4/11

5:35 pm-3:35 pm

2 stops16h 00m

Porto

Sun 4/20

5:00 am-4:52 pm

2 stops17h 52m

$1,038

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Thu 4/24

5:34 pm-6:40 pm

2 stops19h 06m

Lisbon Humberto Delgado

Thu 5/1

5:00 am-8:39 pm

2 stops21h 39m

$1,366

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/18

Showing 1-10 of 20 results
1
2

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.

Travel insights for flights from St. Louis to Portugal

Get recent, data-driven insights about flights from St. Louis to Portugal including ideal travel times, pricing trends, and more.

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 $1,234). 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 February 20, 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 February 20, 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
8,220 reviews

Comfort

8.0

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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
8,220 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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
1,333 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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
8,766 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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
8,220 reviews

Comfort

8.0

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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 Canada
7.0
Good
8,748 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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 Iberia. According to our data, you can fly for as low as $414. Users have also found prices from $434 and $448 on United Airlines and Lufthansa, 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 $1,234). 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$562Average$791FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$582Average$884FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$595Average$1,110FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$601Average$936FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$635Average$1,079FlexibilityNo cancel feeOn-time71%
DeltaCheapest$652Average$1,073FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$779Average$1,086FlexibilityNo cancel feeOn-time67%
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