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

For one-way options, check prices for Aer Lingus. According to our data, you can fly for as low as $415. Users have also found prices from $477 and $601 on Air Canada 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.

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 American Airlines, Air Canada or British Airways as they are the most popular for this route.

How far in advance should I book a flight from St. Louis to Portugal?

Users have found that booking a flight from St. Louis to Portugal at least 28 days early can save you up to 111% on average compared to booking a flight this week. If booking 28 days before your flight isn’t an option for you, users have found flights from St. Louis to Portugal for as little as $789 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $1,737 for flights departing within the next 3 days.

What is the cheapest month to fly from St. Louis to Portugal?

Flights from St. Louis to Portugal lean towards being more expensive in June. Prices are generally better when you fly from St. Louis to Portugal in November, with the cheapest ticket starting at $566.

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.

$912+ Flights from St. Louis to Portugal - Compare & Save Big

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$650 (CheapOair)
One-way from	$415 (Ovago)
Popular in	June
Cheapest in	November
Average price	$1,254

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. 25% potential increase in price ($332 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($46 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in May 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 May 1, 2025.

Tue 11/256:45 amSTL - LIS

2 stops20h 35mUnited Airlines

Tue 12/211:00 amLIS - STL

2 stops33h 18mUnited Airlines

Deal found 4/30

$569

Mon 11/244:15 pmSTL - LIS

1 stop11h 05mAir Canada

Thu 12/411:00 amLIS - STL

2 stops33h 18mAir Canada

Deal found 4/30

$571

Tue 11/256:43 amSTL - LIS

1 stop20h 32mMultiple Airlines

Tue 12/23:50 pmLIS - STL

2 stops32h 25mMultiple Airlines

Deal found 4/30

$585

Sun 11/233:45 pmSTL - LIS

1 stop17h 20mLufthansa

Wed 12/35:00 amLIS - STL

1 stop14h 55mLufthansa

Deal found 4/30

$609

Fri 11/76:29 pmSTL - LIS

2 stops17h 26mBritish Airways

Sat 11/156:40 pmLIS - STL

2 stops31h 36mBritish Airways

Deal found 4/30

$684

Wed 9/242:42 pmSTL - LIS

1 stop12h 23mIberia

Mon 9/296:35 amLIS - STL

2 stops19h 48mIberia

Deal found 4/29

$822

Fri 9/191:22 pmSTL - OPO

2 stops16h 18mAmerican Airlines

Sat 9/278:15 amOPO - STL

2 stops18h 08mAmerican Airlines

Deal found 4/30

$837

Sat 9/275:11 pmSTL - OPO

2 stops34h 34mUnited Airlines

Sun 10/1212:10 pmOPO - STL

2 stops32h 09mUnited Airlines

Deal found 4/30

$846

Wed 11/2611:20 amSTL - LIS

2 stops16h 50mAer Lingus

Mon 12/110:50 amLIS - STL

2 stops39h 10mAer Lingus

Deal found 4/30

$851

Sun 7/276:10 amSTL - LIS

1 stop20h 55mAmerican Airlines

Tue 8/511:05 amLIS - STL

1 stop15h 19mAmerican Airlines

Deal found 4/30

$892

Thu 11/271:55 pmSTL - LIS

2 stops40h 15mFinnair

Tue 12/23:50 pmLIS - STL

2 stops32h 25mFinnair

Deal found 4/30

$913

Sat 9/271:30 pmSTL - OPO

1 stop14h 05mMultiple Airlines

Sun 10/126:15 amOPO - STL

2 stops39h 23mMultiple Airlines

Deal found 4/29

$931

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 May 1, 2025.

Sat 10/184:05 pmSTL - LIS

2 stops35h 15mMultiple Airlines

Sat 11/15:00 amLIS - STL

2 stops17h 14mMultiple Airlines

Deal found 4/30

$650

Sat 10/189:15 amSTL - LIS

1 stop19h 50mUnited Airlines

Sat 11/111:55 amLIS - STL

2 stops28h 32mUnited Airlines

Deal found 4/30

$698

Wed 9/244:52 pmSTL - LIS

2 stops19h 03mBritish Airways

Mon 9/298:45 pmLIS - STL

2 stops33h 04mBritish Airways

Deal found 4/30

$801

Sat 8/164:00 pmSTL - LIS

2 stops35h 20mAir Canada

Sat 8/309:50 amLIS - STL

2 stops30h 50mAir Canada

Deal found 4/30

$803

Wed 9/242:42 pmSTL - LIS

1 stop12h 23mIberia

Mon 9/296:35 amLIS - STL

2 stops19h 48mIberia

Deal found 4/29

$822

Fri 9/191:22 pmSTL - OPO

2 stops16h 18mAmerican Airlines

Sat 9/278:15 amOPO - STL

2 stops18h 08mAmerican Airlines

Deal found 4/30

$837

Tue 5/136:00 amSTL - LIS

2 stops20h 00mDelta

Thu 5/2912:45 pmLIS - STL

2 stops16h 41mDelta

Deal found 4/29

$941

Sun 7/65:30 pmSTL - LIS

2 stops22h 20mLufthansa

Mon 7/142:25 pmLIS - STL

2 stops31h 22mLufthansa

Deal found 4/30

$949

Thu 5/157:06 pmSTL - LIS

2 stops16h 44mAir France

Thu 5/2910:00 amLIS - STL

2 stops16h 39mAir France

Deal found 4/29

$1,017

Sun 6/810:48 amSTL - LIS

2 stops15h 12mKLM

Thu 6/1910:00 amLIS - STL

2 stops19h 51mKLM

Deal found 4/30

$1,024

Sat 9/275:11 pmSTL - OPO

2 stops34h 34mUnited Airlines

Sun 10/1212:10 pmOPO - STL

2 stops32h 09mUnited Airlines

Deal found 4/30

$846

Sun 7/276:10 amSTL - LIS

1 stop20h 55mAmerican Airlines

Tue 8/511:05 amLIS - STL

1 stop15h 19mAmerican Airlines

Deal found 4/30

$892

Last-minute flights from St. Louis to Portugal
Discover last-minute flight deals from St. Louis to Portugal. Data last updated May 1, 2025 and is based on user searches.

Wed 5/71:38 pmSTL - OPO

2 stops16h 02mIberia

Wed 5/1412:20 pmOPO - STL

2 stops15h 32mIberia

Deal found 4/30

$1,757

Wed 5/73:30 pmSTL - OPO

1 stop13h 50mLufthansa

Wed 5/146:00 amOPO - STL

2 stops15h 47mLufthansa

Deal found 4/30

$1,785

Wed 5/73:30 pmSTL - OPO

1 stop13h 50mMultiple Airlines

Wed 5/1412:35 pmOPO - STL

1 stop17h 14mMultiple Airlines

Deal found 4/30

$2,013

Sun 5/112:30 pmSTL - LIS

1 stop14h 35mAir Canada

Thu 5/2911:25 amLIS - STL

1 stop14h 33mAir Canada

Deal found 4/30

$1,991

Tue 5/136:00 amSTL - LIS

2 stops20h 00mDelta

Thu 5/2912:45 pmLIS - STL

2 stops16h 41mDelta

Deal found 4/29

$941

Tue 5/135:29 pmSTL - LIS

2 stops22h 36mLufthansa

Mon 5/262:25 pmLIS - STL

2 stops31h 05mLufthansa

Deal found 4/29

$978

Tue 5/131:30 pmSTL - LIS

1 stop13h 50mMultiple Airlines

Fri 5/305:05 amLIS - STL

1 stop14h 25mMultiple Airlines

Deal found 4/29

$1,031

Tue 5/131:30 pmSTL - LIS

1 stop13h 50mUnited Airlines

Tue 5/2712:15 pmLIS - STL

1 stop31h 15mUnited Airlines

Deal found 4/29

$1,049

Tue 5/131:45 pmSTL - LIS

1 stop13h 20mBritish Airways

Sun 5/256:35 amLIS - STL

2 stops21h 40mBritish Airways

Deal found 4/30

$2,035

Thu 5/157:30 amSTL - LIS

2 stops24h 05mAir Canada

Wed 5/216:45 amLIS - STL

2 stops19h 13mAir Canada

Deal found 4/30

$830

Thu 5/157:06 pmSTL - LIS

2 stops16h 44mAir France

Thu 5/2910:00 amLIS - STL

2 stops16h 39mAir France

Deal found 4/29

$1,017

Sat 5/1710:36 amSTL - LIS

2 stops30h 49mIberia

Tue 5/276:35 amLIS - STL

2 stops23h 16mIberia

Deal found 4/29

$1,209

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 May 1, 2025.

Wed 10/159:47 amSTL - LIS

2 stops18h 58mAer Lingus

Deal found 4/30

$415

Fri 8/158:44 amSTL - OPO

3 stops41h 46mMultiple Airlines

Deal found 4/30

$450

Wed 10/151:30 pmSTL - LIS

1 stop13h 50mAir Canada

Deal found 4/30

$477

Sun 6/15:45 pmSTL - LIS

3 stops45h 25mMultiple Airlines

Deal found 4/30

$531

Wed 7/24:23 pmSTL - LIS

2 stops25h 02mFinnair

Deal found 4/30

$601

Thu 9/251:22 pmSTL - OPO

2 stops16h 18mAmerican Airlines

Deal found 4/30

$631

Thu 9/255:21 pmSTL - OPO

1 stop10h 24mUnited Airlines

Deal found 4/30

$643

Fri 8/153:30 pmSTL - OPO

1 stop13h 45mLufthansa

Deal found 4/30

$664

Sun 6/221:30 pmSTL - LIS

1 stop13h 50mUnited Airlines

Deal found 4/30

$788

Sun 6/16:00 amSTL - LIS

1 stop21h 05mAmerican Airlines

Deal found 4/30

$790

Sat 6/141:30 pmSTL - OPO

1 stop14h 05mAir Canada

Deal found 4/30

$918

Wed 10/151:22 pmSTL - LIS

2 stops20h 18mBritish Airways

Deal found 4/30

$977

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

Sat 10/18

4:05 pm-9:20 am

2 stops35h 15m

Lisbon Humberto Delgado

Sat 11/1

5:00 am-5:14 pm

2 stops17h 14m

$650

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sat 10/18

9:15 am-11:05 am

1 stop19h 50m

Lisbon Humberto Delgado

Sat 11/1

11:55 am-11:27 am

2 stops28h 32m

$698

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Wed 9/24

4:52 pm-5:55 pm

2 stops19h 03m

Lisbon Humberto Delgado

Mon 9/29

8:45 pm-11:49 pm

2 stops33h 04m

$801

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sat 8/16

4:00 pm-9:20 am

2 stops35h 20m

Lisbon Humberto Delgado

Sat 8/30

9:50 am-10:40 am

2 stops30h 50m

$803

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Wed 9/24

2:42 pm-9:05 am

1 stop12h 23m

Lisbon Humberto Delgado

Mon 9/29

6:35 am-8:23 pm

2 stops19h 48m

$822

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 9/19

1:22 pm-11:40 am

2 stops16h 18m

Porto

Sat 9/27

8:15 am-8:23 pm

2 stops18h 08m

$837

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sat 9/27

5:11 pm-9:45 am

2 stops34h 34m

Porto

Sun 10/12

12:10 pm-2:19 pm

2 stops32h 09m

$846

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sun 7/27

6:10 am-9:05 am

1 stop20h 55m

Lisbon Humberto Delgado

Tue 8/5

11:05 am-8:24 pm

1 stop15h 19m

$892

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sat 9/27

1:30 pm-9:35 am

1 stop14h 05m

Porto

Sun 10/12

6:15 am-3:38 pm

2 stops39h 23m

$931

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Tue 5/13

6:00 am-8:00 am

2 stops20h 00m

Lisbon Humberto Delgado

Thu 5/29

12:45 pm-11:26 pm

2 stops16h 41m

$941

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 28 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, 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 $1,178). 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?

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

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

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

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

7,934 reviews

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

7,934 reviews

Delta

8.0

Very good

7,934 reviews

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

1,334 reviews

Delta

8.0

Very good

7,934 reviews

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

1,275 reviews

Delta

8.0

Very good

7,934 reviews

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

1,446 reviews

Delta

8.0

Very good

7,934 reviews

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

8,696 reviews

Delta

8.0

Very good

7,934 reviews

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

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 Aer Lingus. According to our data, you can fly for as low as $415. Users have also found prices from $477 and $601 on Air Canada 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 $1,178). 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

Alternative routes for St. Louis to Portugal

St. Louis to Heathrow flights

St. Louis to Frankfurt flights

St. Louis to Leonardo da Vinci/Fiumicino flights

Kansas City to Dublin flights

Kansas City to Heathrow flights

Kansas City to Leonardo da Vinci/Fiumicino flights

St. Louis to Dublin flights

St. Louis to Gatwick flights

St. Louis to Belfast Intl flights

St. Louis to Belfast City flights

Kansas City to Charles de Gaulle flights

Kansas City to Gatwick flights

Kansas City to Frankfurt flights

St. Louis to London City flights

St. Louis to Charles de Gaulle flights

St. Louis to Athens flights

Kansas City to London City flights

Kansas City to Vicenza flights

Kansas City to Athens flights

St. Louis to Lisbon flights

St. Louis to Orly flights

St. Louis to Sarajevo flights

St. Louis to Munich flights

St. Louis to Barcelona-El Prat flights

Kansas City to Istanbul flights

St. Louis to Istanbul flights

Kansas City to Keflavik Intl flights

St. Louis to Zurich flights

Kansas City to Barcelona-El Prat flights

Kansas City to Malpensa flights

Kansas City to Amsterdam flights

Kansas City to Lisbon flights

Kansas City to Linate flights

Kansas City to Edinburgh flights

St. Louis to Vicenza flights

St. Louis to Keflavik Intl flights

Kansas City to Zurich flights

Kansas City to Sabiha Gokcen flights

St. Louis to Edinburgh flights

St. Louis to Madrid flights

St. Louis to Amsterdam flights

Kansas City to Madrid flights

Kansas City to Florence flights

St. Louis to Malpensa flights

Kansas City to Munich flights

Kansas City to Bruxelles-National flights

St. Louis to Manchester flights

St. Louis to Shannon flights

St. Louis to Sabiha Gokcen flights

Kansas City to Naples flights

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

Porto car rentals

Funchal car rentals

Ponta Delgada car rentals

Faro car rentals

Top 7 airlines flying from St. Louis to Portugal

Airline	Cheapest	Average	Flexibility	On-time
Iberia	Cheapest$566	Average$786	FlexibilityNo cancel fee	On-time77%
Lufthansa	Cheapest$601	Average$1,093	FlexibilityNo cancel fee	On-time76%
United Airlines	Cheapest$603	Average$1,087	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$618	Average$1,138	FlexibilityNo cancel fee	On-time71%
British Airways	Cheapest$625	Average$925	FlexibilityNo cancel fee	On-time70%
Delta	Cheapest$680	Average$1,063	FlexibilityNo cancel fee	On-timeN/A
Air Canada	Cheapest$771	Average$1,089	FlexibilityNo cancel fee	On-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.

$415+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Portugal with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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 May 1, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find 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 May 1, 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 May 1, 2025.

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?

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 May 1, 2025.

Rainfall in Portugal by month

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

Temperature in Portugal by month

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

Reviews of airlines servicing Portugal

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.

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?

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

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.

Top 7 airlines flying from St. Louis to Portugal

100% Free

Book with Flexibility

Travel Smart

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 May 1, 2025.