Daily rates here usually undercut the on-site terminal car parks
The Long Stay Car Park at Adolfo Suárez Madrid–Barajas Airport sits a short shuttle ride from T1–T3 and T4, and is set up for trips of several days or longer. You park your own car, keep your keys, and pay a lower daily rate than the standard T1, T2, T3 or T4 garages right by the terminals.
This is an outdoor long-stay lot with marked bays and numbered zones, so you can note your section and row before you head to the bus stop. It connects to all terminals at MAD (T1, T2, T3, T4 and T4S via T4) using airport-operated shuttle buses, which means you don’t have to move the car between terminals if your outbound is from T4 and the return lands in T1.
The shuttle typically runs every few minutes in daytime peaks, then stretches a bit later at night, and the drive to T1–T3 or T4 usually takes around 10–15 minutes depending on traffic inside the airport perimeter. Buses are clearly signed for their terminal route, so check the windshield board for T1–T2–T3 or T4 before you get on.
Payment works like the rest of Madrid–Barajas parking: you take a ticket at entry, then pay at a machine before exiting, using cards or cash in euros. Prebooking online through the official AENA system often shaves a chunk off the gate price, especially if you lock it in several days before your departure date.
Practical tip: take a quick photo of your row number and the closest shuttle stop sign before you roll your suitcase away; it makes the return from T4S via T4, then back to the Long Stay Car Park, much less of a guessing game after a late-night landing.