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$321+ Cheap flights from St. Louis (STL) to Madrid, Spain (MAD)

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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — MAD
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Madrid Barajas are usually found in November or January, booked 28 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from St. Louis to Madrid

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Madrid (MAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 14, 2025.

Round-trip from

$415
(United Airlines)

One-way from

$321
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$942
From Lambert-St Louis to Madrid Barajas
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One-way flight from Lambert-St Louis to Madrid Barajas
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High demand for flights, 5% potential price rise
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Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from St. Louis to Madrid

Cheapest flights from St. Louis to Madrid
Explore the most affordable flight options available from St. Louis to Madrid. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This United Airlines deal was found by Cheapflights users on 8/13. 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 11/188:25 amSTL - MAD
1 stop16h 40mUnited Airlines
Wed 11/261:35 pmMAD - STL
2 stops29h 53mUnited Airlines
Deal found 8/13$415
This Air Canada deal was found by Cheapflights users on 8/13. 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.
Tue 11/187:00 amSTL - MAD
2 stops18h 00mMultiple Airlines
Wed 11/261:35 pmMAD - STL
2 stops32h 54mMultiple Airlines
Deal found 8/13$434
This KLM deal was found by Cheapflights users on 8/13. 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.
Tue 11/181:30 pmSTL - MAD
1 stop12h 30mKLM
Wed 11/2611:00 amMAD - STL
1 stop17h 59mKLM
Deal found 8/13$438
This Cheapflightsfares deal was found by Cheapflights users on 8/12. 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 10/83:30 pmSTL - MAD
1 stop21h 20mLufthansa
Wed 10/156:00 amMAD - STL
1 stop14h 30mLufthansa
Deal found 8/12$519
This Cheapflightsfares deal was found by Cheapflights users on 8/12. 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.
Tue 10/712:25 pmSTL - MAD
2 stops18h 45mLufthansa
Wed 10/156:00 amMAD - STL
1 stop14h 30mLufthansa
Deal found 8/12$520
This United Airlines deal was found by Cheapflights users on 8/12. 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 11/187:00 amSTL - MAD
2 stops18h 00mUnited Airlines
Tue 12/26:05 amMAD - STL
2 stops39h 20mUnited Airlines
Deal found 8/12$524
This Delta deal was found by Cheapflights users on 8/12. 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.
Tue 11/187:20 amSTL - MAD
1 stop18h 40mDelta
Tue 12/212:35 pmMAD - STL
2 stops28h 00mDelta
Deal found 8/12$547
This Flightnetwork deal was found by Cheapflights users on 8/13. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/61:30 pmSTL - MAD
1 stop10h 10mAir Canada
Wed 10/2212:30 pmMAD - STL
1 stop14h 08mAir Canada
Deal found 8/13$551
This Lufthansa deal was found by Cheapflights users on 8/12. 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 11/236:43 pmSTL - MAD
2 stops16h 07mLufthansa
Tue 12/212:05 pmMAD - STL
2 stops18h 37mLufthansa
Deal found 8/12$552

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Madrid 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 August 14, 2025.
Use the filters below to find and compare flights from St. Louis to Madrid that are best for you.

Fly from

St. Louis

Fly to

Madrid

Route

Depart

Return

Price

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Tue 11/18

8:25 am-8:05 am

1 stop16h 40m

Madrid Barajas

Wed 11/26

1:35 pm-12:28 pm

2 stops29h 53m

$415

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Tue 11/18

7:00 am-8:00 am

2 stops18h 00m

Madrid Barajas

Wed 11/26

1:35 pm-3:29 pm

2 stops32h 54m

$434

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Tue 11/18

1:30 pm-9:00 am

1 stop12h 30m

Madrid Barajas

Wed 11/26

11:00 am-9:59 pm

1 stop17h 59m

$438

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Wed 10/8

3:30 pm-7:50 pm

1 stop21h 20m

Madrid Barajas

Wed 10/15

6:00 am-1:30 pm

1 stop14h 30m

$519

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Tue 10/7

12:25 pm-5:35 pm

2 stops22h 10m

Madrid Barajas

Wed 10/15

6:00 am-1:30 pm

1 stop14h 30m

$520

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Tue 11/18

7:00 am-8:00 am

2 stops18h 00m

Madrid Barajas

Tue 12/2

6:05 am-2:25 pm

2 stops39h 20m

$524

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Sun 11/23

4:05 pm-8:00 am

2 stops56h 55m

Madrid Barajas

Tue 12/2

5:00 pm-1:55 pm

1 stop27h 55m

$530

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Tue 11/18

7:20 am-9:00 am

1 stop18h 40m

Madrid Barajas

Tue 12/2

12:35 pm-9:35 am

2 stops28h 00m

$547

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Sat 9/13

7:55 pm-9:50 am

3 stops54h 55m

$352

St. LouisMadrid

STL - MAD

STLMAD

Lambert-St Louis

Fri 9/19

1:57 pm-12:20 am

3 stops51h 23m

$368

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 15 results
1
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Best time to book a flight from St. Louis to Madrid

Have a flexible travel schedule? Discover the best time to fly to Madrid 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 Madrid

How far ahead should I book a flight from St. Louis to Madrid?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Madrid. Price data was last updated on August 8, 2025.

The best time to book flights from St. Louis to Madrid is 27 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, November is the cheapest month in which you can book a flight from St. Louis to Madrid (average of $543). Flying from St. Louis to Madrid in June is currently the most expensive (average of $1,053). 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 MAD?

Find hourly flight availability from St. Louis to Madrid. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

One of the essential ways to save on airfare from St. Louis to Madrid is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 18% on airfare.

How much does it cost to fly round-trip from St. Louis to Madrid?

Reviews of airlines servicing Madrid

Get insights into the airlines that provide service to Madrid. 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 Madrid. Reviews last updated August 14, 2025.
Get a feel of what it's like to fly with United Airlines, American Airlines, and Air Canada from St. Louis to Madrid by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,916 reviews

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,916 reviews
United Airlines
7.4
Good
8,916 reviews

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,916 reviews

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Air Canada
7.1
Good
9,949 reviews
United Airlines
7.4
Good
8,916 reviews

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Iberia
7.0
Good
2,882 reviews
United Airlines
7.4
Good
8,916 reviews

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
British Airways
6.7
Okay
7,266 reviews
United Airlines
7.4
Good
8,916 reviews

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Madrid. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from St. Louis to Madrid round-trip?

    According to our current data, British Airways ($546), United Airlines ($578), and Iberia ($581) offers the cheapest pricing from St. Louis to Madrid. You may be able to fly from St. Louis to Madrid for 40% less than the average price by searching for these airlines.

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

    Yes. In addition to deals on St. Louis to Madrid flights, Cheapflights offers vacation packages that include both flights and hotel.

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

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Madrid.

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

    Yes. Cheapflights offers flight deals from St. Louis to Madrid 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 Madrid?

    Currently, November is the cheapest month in which you can book a flight from St. Louis to Madrid (average of $543). Flying from St. Louis to Madrid in June is currently the most expensive (average of $1,053). 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

Traveling to a place near Madrid?

Book flights to Madrid if you plan to visit one of these locations
Segovia
Fuenlabrada

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Madrid

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Madrid flights
Springfield to Madrid flights
Columbia to Madrid flights

Top 7 airlines flying from St. Louis to Madrid

Discover the top 7 airlines that operate flights from St. Louis to Madrid. 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$546Average$812FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$578Average$954FlexibilityNo cancel feeOn-time69%
IberiaCheapest$581Average$901FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$615Average$758FlexibilityNo cancel feeOn-time76%
DeltaCheapest$630Average$865FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$634Average$1,038FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$841Average$973FlexibilityNo cancel feeOn-time67%

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