STL - MAD

$350 Find Cheap Flights from St. Louis to Madrid

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Madrid departing on 7/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Madrid.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Madrid.
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Flights Deals

Cheap Flights from St. Louis to Madrid

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Madrid that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from St. Louis to Madrid

KAYAK's recommended round-trip deals from the most popular airlines that fly from St. Louis to Madrid.
Discover the best prices for you by selecting your travel dates on KAYAK.
Lufthansa Logo
3:30 pm - 7:50 pmSTL-MAD
21h 20m1 stop
Lufthansa Logo
10:50 am - 7:39 pmMAD-STL
15h 49m1 stop
$456Lufthansa
Find Deal
Sun, Oct 12 - Wed, Oct 22
Delta Logo
9:00 am - 9:35 amSTL-MAD
17h 35m1 stop
Delta Logo
10:05 am - 11:39 pmMAD-STL
20h 34m1 stop
$546Delta
Find Deal
Mon, Oct 6 - Wed, Oct 22
United Airlines Logo
1:30 pm - 6:40 amSTL-MAD
10h 10m1 stop
United Airlines Logo
12:45 pm - 3:38 pmMAD-STL
33h 53m2 stops
$599United Airlines
Find Deal
Sun, Oct 12 - Fri, Oct 24
United Airlines Logo
12:28 pm - 6:40 amSTL-MAD
35h 12m2 stops
United Airlines Logo
12:45 pm - 2:19 pmMAD-STL
32h 34m2 stops
$603United Airlines
Find Deal
Sun, Oct 12 - Wed, Oct 22
Iberia Logo
4:17 pm - 2:20 pmSTL-MAD
15h 03m1 stop
Iberia Logo
10:35 am - 8:23 pmMAD-STL
16h 48m2 stops
$616Iberia
Find Deal
Sun, Oct 5 - Sat, Oct 18
British Airways Logo
12:03 pm - 9:05 amSTL-MAD
14h 02m1 stop
British Airways Logo
8:30 pm - 8:23 pmMAD-STL
30h 53m2 stops
$691British Airways
Find Deal
Thu, Oct 9 - Sun, Oct 19
British Airways Logo
8:01 pm - 5:40 pmSTL-MAD
14h 39m2 stops
British Airways Logo
12:50 pm - 11:49 pmMAD-STL
17h 59m2 stops
$695British Airways
Find Deal
Thu, Oct 9 - Sun, Oct 19
Iberia Logo
12:03 pm - 2:20 pmSTL-MAD
19h 17m1 stop
Iberia Logo
5:30 pm - 8:26 amMAD-STL
21h 56m1 stop
$696Iberia
Find Deal
Thu, Oct 9 - Sun, Oct 19
American Airlines Logo
9:45 am - 5:40 amSTL-MAD
12h 55m1 stop
American Airlines Logo
1:00 pm - 11:23 pmMAD-STL
17h 23m1 stop
$831American Airlines
Find Deal
Tue, Aug 26 - Tue, Sep 9
American Airlines Logo
4:52 pm - 2:20 pmSTL-MAD
14h 28m1 stop
American Airlines Logo
10:25 am - 7:23 pmMAD-STL
15h 58m2 stops
$921American Airlines
Find Deal
Sat, May 17 - Sat, May 24
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KAYAK's insights & trends for St. Louis to Madrid flights

Get data-powered insights and trends into flights from St. Louis to Madrid to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from St. Louis to Madrid?

The average price of all round-trip flights from St. Louis to Madrid clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from St. Louis to Madrid, look for departures on Tuesdays and avoid leaving on a Monday, as it's usually the priciest day. When flying back from Madrid, Thursday is the cheapest day to fly and Saturday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Madrid, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Madrid is February, where tickets cost $651 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,309 and $1,247 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Madrid, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Madrid, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know

Low seasonFebruary
High seasonMarch
Cheapest flight$350
Best time to beat the crowds with an average 31% drop in price.
Most popular time to fly and prices are also 10% lower on average.
Flight from St. Louis to Madrid

When to book flights from St. Louis to Madrid

Are your dates flexible? Find out the best times to travel from St. Louis to Madrid based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Madrid

  • What is the cheapest flight from St. Louis to Madrid?

    In the last 3 days, the lowest price for a flight from St. Louis to Madrid was $350 for a one-way ticket and $456 for a round-trip.

  • Do I need a passport to fly between St. Louis and Madrid?

    A passport is required to fly from St. Louis to Madrid.

  • Which airports will I be using when flying from St. Louis to Madrid?

    When flying out of St. Louis you will be using Lambert-St Louis. You will be landing at Madrid, also known as Madrid Barajas.

  • Which aircraft models fly most regularly from St. Louis to Madrid?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Madrid?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between St. Louis and Madrid, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from St. Louis to Madrid, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Madrid are Delta and United Airlines. With an average price for the route of $865 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $914 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from St. Louis to Madrid?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Madrid.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Madrid?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Madrid from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Madrid?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Madrid with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and MAD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Madrid?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Madrid from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top 5 airlines serving from St. Louis to Madrid

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Madrid. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Madrid? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 8696 reviews
7.1Entertainment
8.1Crew
7.7Boarding
6.6Food
7.3Comfort
Airline reviews

Everything is good except the dinner and breakfast. The sandwich is very delicious. Toilet is clean, I only use one of them. Flight attendants are very nice. 👍👍

10.0 ExcellentAnonymous, Apr 2025SFO - HKG
Read more United Airlines reviews

Everything is good except the dinner and breakfast. The sandwich is very delicious. Toilet is clean, I only use one of them. Flight attendants are very nice. 👍👍

A bit rush for transit. Food and entertainment are not available

Boarding was a little difficult. The gate area at O'Hare was very small and crowded due to multiple gates in the area. Could not hear the intercom, so had to rely on signage to see when my group was boarding and the signage was blocked by passengers standing in the gate. Flight was great and we arrived in Montreal on time.

Multiple delays and not straight answer from the United team

For economy, it was very good. Staff was great, they even let some of us change seats for more leg room... Put an empty seat between us which was fantastic for a 12hr flight. Onboard entertainment was excellent, I think over 200 choices of movies/tv/etc The bad was the barely/nonfunctional wifi that cost either $16.99 or 1700 miles (full flight). It was atrocious... Definitely the worst of the last 3 long haul major airlines I was on the last few months.

Stewardess spilled orange juice on my clothes/seat no help no apology just threw napkins at me to clean the mess up. Not Happy.

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

The plane pushed back from the gate on time. However, it stopped on the ramp, and we waited for over 20 minutes before the aircraft pulled back to the gate. Apparently, something of importance had to be removed from the aircraft by the gate agent. I found this to be odd. The delay was not significant, but I felt that whatever was on the aircraft that had to be taken off, should’ve been done before we pushed back from the gate.

I didn’t get on plane. Passport being processed by consulate with visa application. Tried to cancel through underpricer after purchasing cacelling for any reason. No dice, they are thieves.

Electric plugs didn't work. Entertainment system wasn't working

Several delays. Next flight was worse. Did not arrive home until 2am PT

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

Everything about the flight was lovely…We left early, arrived early, cabin crew were efficient and helpful. Flight was easy and most pleasant.

First world problems, but still… We were seated in first class and asked for a cocktail on a very short, 50 minute flight. After our drink order was taken, a half hour went by, and we noticed that every other person in the small plane had been served except for us. We got up to ask about it, the drinks finally came, then were taken away three minutes later since the flight was so short. Really strange situation, on the other hand, we were in Utah.

We missed our flight. The boarding pass had the wrong gate and by the time we received the text from Kayak, our flight was already gone. I’ll never use Kayak again and will go direct to the airlines in the future.

Boarding took forever, the plane was cramped and cold, and the seatbelt song came on constantly throughout the red eye flight with a loud pre-recorded message playing each time

Cabin felt crammed Snacks are lame But crew was super efficient getting us out on time despite delay

Took off on time and successfully avoided weather that looked to be a problem along the way

There were five broken seats on the plane. The crew was very rude in telling people they had to get off the plane and get a flight the next day. No call for volunteers, but telling people they had to get off. One woman was flying with her elderly mother and daughter and was told she had to leave or all three had to leave. Fortunately, a volunteer offered to stay. The situation was handled poorly.

The flight to Tokyo AA61 took off about two hours late, but then had to turn back. By that time the crew had to be replaced. Then they kept promising to take off in an hour, then in 3, then switch to the next day.

Flight from Costa Rica to Madrid was excellent. Good food and service. The flight from Madrid to Brussels was very poor . No food , no entertainment, no usb … Total package was quite expensive so you should give same service on the second flight

business class food was pretty average otherwise it was a good experience

Flight from Madrid to Dakar had no onboard entertainment for a business class. Not even a single screen . That was disappointing. The WiFi only worked for the first 45 mins of the flight.

I paid to upgrade to Business Class. The queue to check in at the Business Class aisle was full of people without Business Class tickets, the fast-track immigration line was “closed” but the representative opened it up for his friends, regardless (there was a lot of fist-bumping), and the lounge was an absolute mess…..4 staff sitting playing with their phones while every table had dirty plates and glasses waiting to be cleared…..and the least said about the rude lady on the reception desk at the lounge , the better!

Horrible. Paid for seats for my family. Iberia changed planes and never notified us that the seats we paid extra for did not even exist on the plane. We were randomly placed on the plane. Thankfully, we were seated together. Upon boarding, my youngest daughter was pulled from the line and they just arbitrarily changed her seat 7 rows back from the rest of the family. I had to wait at the gate while they tried to see us back together. One of the most uncomfortable small spaces on a plane I’ve ever experienced. When I called Iberia, they first told me that no mistake was made that the plane was never changed. Yet my receipt for my paid seats were for rows that did not even exist on this type of plane we were getting on. They said that they would reimburse my money and I would get an email, but I’ve never received any information or emails regarding a refund for the seats that I had paid extra for. Then when we arrived in Madrid, one of the pieces of luggage that we had checked in was damaged to the point that the handle that was stowed in to the luggage was broken off by the crew members handling the luggage. The crew on the plane was very nice, but as far as the rest of the experience, I would be very hesitant to ever use Iberia again.

Bad business class. Staff totally not helping. Lights and chargers not working

The flight left Tanger two hours late and I missed my flight to Geneva.

This was such a bad experience. Iberia in Paris Orly refused to issue the boarding pass for my connecting international flight. They were evasive but said it would be dealt with in Madrid. In Madrid there was no help, no transit desk, I almost missed the flight trying to get the boarding pass and only at the gate they told me they had downgraded me. I really felt abused.

The connection required us to travel from terminal A to terminal E with very little time in between flights. While waiting in line, we were called to the service desk to provide our passports. We provided our passports at time of check in, assuming that American Airlines doesn’t communicate well with Iberia, this was a headache.

Almost great...Need more signs around the airport, especially in Italy Marco Polo.

The row of seats were so cramped it was difficult to get in and out of your seat. I even upgraded. A long flight and sad accommodations 😵‍💫 the shorter flight was very comfortable and the seating was spacious

Smooth Flight, Friendly crew, food offering on board was limited.

I bought a ticket and paid for for our luggage but I had to pay for my luggage again. I’m so disappointed! We had a 30 min delay and because of that we missed our connecting flight and were told that we would be on the next flight (9am flight ) but we were landed we were booked at 12pm flight. I had a little baby w me, it was very stressful. I begged to leave at 10 am at least. I was emailed that we get a voucher but they didn’t work when we were at a breakfast store. I’ve been always happy w Lufthansa but this time was awful.

Good service … bus transfer upon arrival from plane to terminal: atrocious!!!

helpful and friendly. The Lufthanza people I dealt with before my holiday were so unhelpful by comparison.

We had a 1 1/2 hour delay before we left Denver. When we arrive to Frankfort, they didn’t announce that people with connecting flights to exit the plane first. My next flight was already boarding when we we taxiing in to the gate. I waited another 10 minutes to get off the plane. I had to run to catch my next flight. I mean run! I made it with one minute to spare, but my luggage did not. My luggage came two hours later on a different flight.

My flight was late from US to Frankfurt so I missed my connecting flight flight and I had to wait for long to catch the next flight which was very tiring. Otherwise everyone was very nice.

It would have been nice if my luggage had made it onto my connecting flight as well. Now I have to wait for my luggage to be delivered and that might take a while, which certainly put a damper on the entire experience.

Crew was not happy. Very uncomfortable seats. When person leans back in front of you the screen is too close to me. Food was awful.

They lost my luggage and despite all follow ups through emails and phone calls they don’t give me an update

Too much long line at the TSA and Security. Prepare for long walk for baggage claim.

The flight from Seattle was delayed, which made me miss my connection to Florence. I was re-booked NINE HOURS LATER!!! That’s basically a vacation day lost. British Airways needs to partner with other airlines when possible to get a more realistic travel time, if delays occur. I realize there aren’t many flights to Florence from London, so I would book differently were I to return. The actual flight from Seattle was very comfortable and the crew was great, no faults there. I enjoy British Airways, this was an anomaly.

The crew could not have been more helpful, my meal was excellent, I slept peacefully until right before landing, and the BA lounge was a godsend. The only negative I encountered was the coffee both on the plane and in the lounge. Not to my taste but that’s a personal preference.

I don’t understand why a reputable airline like BA would delegate their London flights to AA. Makes no sense to me, as most domestic carriers do such a poor job these days. Terminal 3 at LHR is a total dump

The boarding process was quite loud and chaotic. The flight attendants kept barking over the PA system about people needing to only stow large items in the overhead bins. During the one and only service, I was hit by the service cart. At the same time, a passenger was returning from the bathroom and the crew definitely saw him but stopped a few seats short of allowing him to sit down before starting service and made him wait a good 10 minutes before passing his seat and allowing him to sit down, after which he had to ask for his snack and beverage or he would have been passed over. Neither flight attendant thanked passengers as they left; in fact, I did not see them again once the plane door was opened.

The airplane was old. Some things didn’t work out of middle seat was broken. The rest was OK.

Cancelled flight minutes before boarding. Rescheduled flight was two days later

The flight attendants were EXTREMELY personable and appreciated the service, lights going off after dinner (probably the norm, but I haven’t flown evening overnight flights in a while). Thank you!

Business class seats were very dated on my plane. Very little storage, charging ports were not easily accessible, tv screen kept flopping away. Vegetarian food was disappointing: hardly any protein and severely under-seasoned. Crew was lovely.

The food was ok, but not great. They delayed boarding in Portland and did not enforce group boarding. But the crew was excellent, went above and beyond.

Everything you need to know for your flight from St. Louis to Madrid

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