How long is the flight from St. Louis to Portugal?

United Airlines and Delta can get you from St. Louis to Portugal in just under 14h 50m. Your travel time can differ by up to 5h 10m. The distance from St. Louis to Portugal is about 4212 mi. This flight may include one or multiple stops.

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

For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $352. Users have also found prices from $371 and $391 on American Airlines and Air Canada, respectively.

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.

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).

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.

What are the most popular airlines that fly from St. Louis to Portugal?

When booking a flight from St. Louis to Portugal, you may want to consider flying on United Airlines, Air Canada or American Airlines as they are the most popular for this route.

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

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.

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.

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.

$347+ Flights from St. Louis to Portugal

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Cheap 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 December 28, 2025.

Sun 12/288:01 pmSTL - LIS

2 stops31h 04mMultiple Airlines

Sun 1/43:55 pmLIS - STL

2 stops37h 49mMultiple Airlines

Deal found 12/25

$2,500

Fri 12/264:05 pmSTL - LIS

1 stop11h 15mMultiple Airlines

Sat 1/34:45 pmLIS - STL

2 stops59h 50mMultiple Airlines

Deal found 12/26

$3,627

Fri 12/263:41 pmSTL - LIS

2 stops35h 49mKLM

Sat 1/35:00 amLIS - STL

2 stops19h 17mKLM

Deal found 12/26

$3,742

Sun 12/283:50 pmSTL - LIS

1 stop13h 45mLufthansa

Sun 1/411:55 amLIS - STL

1 stop13h 27mLufthansa

Deal found 12/26

$3,764

Wed 12/311:05 pmSTL - OPO

2 stops39h 55mUnited Airlines

Wed 1/216:55 amOPO - STL

2 stops16h 23mUnited Airlines

Deal found 12/26

$7,271

Wed 12/314:05 pmSTL - OPO

2 stops37h 05mAir Canada

Thu 1/226:00 amOPO - STL

2 stops39h 29mAir Canada

Deal found 12/26

$7,420

Wed 12/314:05 pmSTL - OPO

2 stops37h 05mAir Canada

Sun 1/256:00 amOPO - STL

2 stops39h 29mAir Canada

Deal found 12/26

$7,670

Wed 12/314:05 pmSTL - OPO

2 stops37h 05mAir Canada

Fri 1/239:00 amOPO - STL

2 stops36h 29mAir Canada

Deal found 12/26

$7,676

Sat 12/271:05 pmSTL - LIS

2 stops20h 35mLufthansa

Sat 1/36:10 amLIS - STL

2 stops21h 33mLufthansa

Deal found 12/26

$16,099

Best flights from St. Louis to Portugal
Discover carefully curated flight deals from St. Louis to Portugal that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 28, 2025.

Fri 1/239:57 amSTL - LIS

2 stops17h 23mMultiple Airlines

Tue 1/275:00 amLIS - STL

2 stops24h 59mMultiple Airlines

Deal found 12/26

$492

Sun 2/811:20 amSTL - LIS

2 stops14h 50mUnited Airlines

Sun 2/155:00 amLIS - STL

2 stops22h 05mUnited Airlines

Deal found 12/25

$499

Fri 5/16:00 amSTL - LIS

2 stops20h 00mDelta

Sun 5/105:00 amLIS - STL

2 stops19h 02mDelta

Deal found 12/26

$500

Sun 2/811:22 amSTL - LIS

1 stop14h 48mLufthansa

Sun 2/1510:15 amLIS - STL

1 stop19h 50mLufthansa

Deal found 12/26

$503

Sun 3/222:00 pmSTL - LIS

2 stops17h 05mBritish Airways

Sun 3/295:10 pmLIS - STL

2 stops36h 42mBritish Airways

Deal found 12/26

$508

Fri 1/239:57 amSTL - LIS

2 stops17h 23mMultiple Airlines

Fri 1/308:20 amLIS - STL

2 stops21h 39mMultiple Airlines

Deal found 12/26

$492

Thu 1/228:05 amSTL - OPO

2 stops21h 35mUnited Airlines

Mon 1/266:00 amOPO - STL

2 stops39h 29mUnited Airlines

Deal found 12/24

$503

Tue 2/1010:19 amSTL - OPO

2 stops18h 11mMultiple Airlines

Tue 2/179:55 amOPO - STL

2 stops19h 41mMultiple Airlines

Deal found 12/27

$493

Fri 1/234:05 pmSTL - LIS

1 stop11h 15mUnited Airlines

Tue 1/2710:15 amLIS - STL

1 stop13h 03mUnited Airlines

Deal found 12/24

$508

Mon 3/169:42 amSTL - LIS

2 stops17h 18mDelta

Tue 3/2411:15 amLIS - STL

2 stops26h 29mDelta

Deal found 12/27

$561

Mon 2/99:33 amSTL - LIS

1 stop17h 32mMultiple Airlines

Mon 2/1611:05 amLIS - STL

1 stop18h 18mMultiple Airlines

Deal found 12/25

$506

Tue 3/171:34 pmSTL - LIS

2 stops13h 26mDelta

Tue 3/2410:00 amLIS - STL

2 stops28h 05mDelta

Deal found 12/27

$561

Mon 2/96:40 pmSTL - OPO

2 stops38h 05mUnited Airlines

Mon 2/1612:30 pmOPO - STL

2 stops57h 08mUnited Airlines

Deal found 12/25

$527

Thu 4/166:32 amSTL - OPO

2 stops22h 23mDelta

Tue 4/216:15 amOPO - STL

2 stops20h 23mDelta

Deal found 12/26

$679

Thu 4/167:45 amSTL - OPO

2 stops21h 30mUnited Airlines

Tue 4/2112:00 pmOPO - STL

1 stop31h 25mUnited Airlines

Deal found 12/26

$712

Wed 6/175:00 pmSTL - OPO

1 stop11h 30mMultiple Airlines

Mon 6/295:00 amOPO - STL

2 stops17h 49mMultiple Airlines

Deal found 12/27

$792

Mon 5/255:30 pmSTL - OPO

2 stops15h 55mDelta

Thu 6/45:00 amOPO - STL

2 stops21h 31mDelta

Deal found 12/25

$796

Mon 5/255:00 pmSTL - OPO

1 stop11h 30mMultiple Airlines

Thu 6/45:00 amOPO - STL

2 stops17h 45mMultiple Airlines

Deal found 12/26

$792

Last-minute flights from St. Louis to Portugal
Discover last-minute flight deals from St. Louis to Portugal. Data last updated December 28, 2025 and is based on user searches.

Fri 1/211:41 amSTL - OPO

2 stops18h 04mMultiple Airlines

Fri 1/238:20 amOPO - STL

2 stops15h 54mMultiple Airlines

Deal found 12/26

$2,970

Fri 1/24:53 pmSTL - OPO

2 stops20h 07mBritish Airways

Wed 1/218:40 pmOPO - STL

2 stops27h 34mBritish Airways

Deal found 12/26

$2,996

Sat 1/32:08 pmSTL - OPO

2 stops15h 37mMultiple Airlines

Fri 1/238:20 amOPO - STL

2 stops15h 54mMultiple Airlines

Deal found 12/26

$2,952

Sat 1/32:08 pmSTL - OPO

2 stops15h 37mIberia

Sat 1/248:40 pmOPO - STL

2 stops27h 34mIberia

Deal found 12/26

$5,012

Sun 1/44:53 pmSTL - OPO

2 stops17h 47mBritish Airways

Fri 1/238:20 amOPO - STL

2 stops15h 54mBritish Airways

Deal found 12/26

$2,918

Mon 1/52:50 pmSTL - OPO

2 stops20h 45mBritish Airways

Thu 1/228:20 amOPO - STL

2 stops18h 55mBritish Airways

Deal found 12/26

$2,985

Wed 1/146:40 pmSTL - LIS

2 stops19h 15mLufthansa

Wed 1/215:00 amLIS - STL

1 stop14h 55mLufthansa

Deal found 12/25

$541

Thu 1/228:05 amSTL - OPO

2 stops21h 35mUnited Airlines

Mon 1/266:00 amOPO - STL

2 stops39h 29mUnited Airlines

Deal found 12/24

$503

Fri 1/234:05 pmSTL - LIS

1 stop11h 15mMultiple Airlines

Fri 1/3011:20 amLIS - STL

1 stop34h 09mMultiple Airlines

Deal found 12/26

$487

Fri 1/234:05 pmSTL - LIS

1 stop11h 15mMultiple Airlines

Tue 1/275:00 amLIS - STL

2 stops40h 29mMultiple Airlines

Deal found 12/26

$489

Fri 1/234:05 pmSTL - LIS

1 stop11h 15mAir Canada

Tue 1/275:00 amLIS - STL

2 stops40h 29mAir Canada

Deal found 12/24

$493

Fri 1/234:05 pmSTL - LIS

1 stop11h 15mUnited Airlines

Tue 1/2710:15 amLIS - STL

1 stop13h 03mUnited Airlines

Deal found 12/24

$508

One-way flights from St. Louis to Portugal
Search for one-way flight options from St. Louis to Portugal. Find affordable one-way fares based on user searches. Data last updated December 28, 2025.

Thu 5/71:30 pmSTL - LIS

2 stops22h 20mDelta

Deal found 12/26

$347

Wed 2/253:49 pmSTL - LIS

2 stops36h 06mMultiple Airlines

Deal found 12/27

$356

Fri 3/67:52 amSTL - LIS

2 stops43h 13mMultiple Airlines

Deal found 12/26

$364

Wed 2/2512:15 pmSTL - LIS

1 stop16h 00mLufthansa

Deal found 12/27

$393

Sat 3/77:41 amSTL - LIS

2 stops19h 14mUnited Airlines

Deal found 12/26

$402

Fri 3/610:04 amSTL - LIS

2 stops18h 06mAer Lingus

Deal found 12/25

$403

Fri 3/64:05 pmSTL - LIS

2 stops34h 50mAir Canada

Deal found 12/27

$404

Thu 5/72:20 pmSTL - LIS

1 stop14h 40mAir Canada

Deal found 12/26

$408

Mon 5/2510:01 amSTL - OPO

2 stops19h 44mAmerican Airlines

Deal found 12/27

$545

Mon 5/2510:45 amSTL - OPO

2 stops17h 45mDelta

Deal found 12/27

$553

Mon 5/259:40 amSTL - OPO

3 stops39h 10mMultiple Airlines

Deal found 12/27

$557

Sun 5/249:40 pmSTL - OPO

2 stops16h 20mAmerican Airlines

Deal found 12/27

$637

Find flight deals from St. Louis to Portugal

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$463 (Kiwi.com)
One-way from	$347 (Delta)
Popular in	December
Cheapest in	January
Average price	$2,683

Provider with most accurate pricing for Lambert-St Louis-Lisbon Humberto Delgado flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Lisbon Humberto Delgado flights.

Search Deals

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. 20% potential increase in price ($274 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 15% potential price decrease ($146 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Fri 1/23

9:57 am-9:20 am

2 stops17h 23m

Lisbon Humberto Delgado

Tue 1/27

5:00 am-11:59 pm

2 stops24h 59m

$492

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Fri 1/23

9:57 am-9:20 am

2 stops17h 23m

Lisbon Humberto Delgado

Fri 1/30

8:20 am-11:59 pm

2 stops21h 39m

$492

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 2/10

10:19 am-10:30 am

2 stops18h 11m

Porto

Tue 2/17

9:55 am-11:36 pm

2 stops19h 41m

$493

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sun 2/8

11:20 am-8:10 am

2 stops14h 50m

Lisbon Humberto Delgado

Sun 2/15

5:00 am-9:05 pm

2 stops22h 05m

$499

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Fri 5/1

6:00 am-8:00 am

2 stops20h 00m

Lisbon Humberto Delgado

Sun 5/10

5:00 am-6:02 pm

2 stops19h 02m

$500

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sun 2/8

11:22 am-8:10 am

1 stop14h 48m

Lisbon Humberto Delgado

Sun 2/15

10:15 am-12:05 am

1 stop19h 50m

$503

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Thu 1/22

8:05 am-11:40 am

2 stops21h 35m

Porto

Mon 1/26

6:00 am-3:29 pm

2 stops39h 29m

$503

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Mon 2/9

9:33 am-9:05 am

1 stop17h 32m

Lisbon Humberto Delgado

Mon 2/16

11:05 am-11:23 pm

1 stop18h 18m

$506

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sun 3/22

2:00 pm-12:05 pm

2 stops17h 05m

Lisbon Humberto Delgado

Sun 3/29

5:10 pm-11:52 pm

2 stops36h 42m

$508

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Fri 1/23

4:05 pm-9:20 am

1 stop11h 15m

Lisbon Humberto Delgado

Tue 1/27

10:15 am-5:18 pm

1 stop13h 03m

$508

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/26

Showing 1-10 of 33 results

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, February is the cheapest month in which you can book a flight from St. Louis to Portugal (average of $502). Flying from St. Louis to Portugal in July is currently the most expensive (average of $891). 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.

Reviews of airlines servicing Portugal

Read through reviews of airlines operating flights from St. Louis to Portugal, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

7.9

Good

8,022 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Delta

7.9

Good

8,022 reviews

Delta

7.9

Good

8,022 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

United Airlines

7.4

Good

9,116 reviews

Delta

7.9

Good

8,022 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

American Airlines

7.2

Good

11,069 reviews

Delta

7.9

Good

8,022 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Air Canada

7.1

Good

10,562 reviews

Delta

7.9

Good

8,022 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Lufthansa

6.8

Okay

7,657 reviews

Delta

7.9

Good

8,022 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Related info for your journey

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.
How long is the flight from St. Louis to Portugal?
United Airlines and Delta can get you from St. Louis to Portugal in just under 14h 50m. Your travel time can differ by up to 5h 10m. The distance from St. Louis to Portugal is about 4212 mi. This flight may include one or multiple stops.
What are the cheapest airlines to fly from St. Louis to Portugal one-way?
For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $352. Users have also found prices from $371 and $391 on American Airlines and Air Canada, 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, February is the cheapest month in which you can book a flight from St. Louis to Portugal (average of $502). Flying from St. Louis to Portugal in July is currently the most expensive (average of $891). 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

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Complete your trip

Portugal car rentals

Madeira car rentals

Azores car rentals

Lisbon Humberto Delgado Airport car rentals

Porto Airport car rentals

Ponta Delgada Nordela Airport car rentals

Lajes Airport car rentals

Lisbon car rentals

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Funchal car rentals

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Faro car rentals

Top 6 airlines flying from St. Louis to Portugal

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$505	Average$1,167	FlexibilityNo cancel fee	On-time71%
Lufthansa	Cheapest$520	Average$1,054	FlexibilityNo cancel fee	On-time76%
Iberia	Cheapest$571	Average$781	FlexibilityNo cancel fee	On-time77%
United Airlines	Cheapest$617	Average$1,051	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$713	Average$924	FlexibilityNo cancel fee	On-timeN/A
Air Canada	Cheapest$787	Average$1,028	FlexibilityNo cancel fee	On-time67%

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$347+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from St. Louis to Portugal

Cheapest flights from St. Louis to PortugalExplore 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 December 28, 2025.

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 December 28, 2025.

Find 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 December 28, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Portugal that are best for you.

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.

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?

Reviews of airlines servicing Portugal

Read through reviews of airlines operating flights from St. Louis to Portugal, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

How long is the flight from St. Louis to Portugal?

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

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

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

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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.

Top 6 airlines flying from St. Louis to Portugal

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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 December 28, 2025.