Trailheads in the Picos de Europa drop from 3 hours to 90 minutes if you drive from SDR instead of stitching buses.
Local Car Hire at Seve Ballesteros–Santander Airport runs off the terminal’s Floor 0, with desks for Avis/Budget, Enterprise, Europcar, Hertz, OK Rent a Car, and Sixt all in the same compact hall. T is tiny, so you walk maybe 2–3 minutes from baggage claim to the counters, then another 1–2 minutes to the attached car park. No off‑airport shuttle loops, no guessing which bus stop your rental brand uses.
All agencies sit landside on Floor 0, just beyond the arrivals door in T, so you can sign the contract before even checking your phone. Hours vary by brand, but the majors usually cover daytime arrivals on Madrid and Barcelona flights, so mid‑morning and late‑afternoon pickups are straightforward. If you land after 23:00, confirm opening times the day before; some counters only stay open for specific late flights.
The airport sits roughly 5 km from Santander city centre, right beside the S‑10 dual carriageway and the bay, so you hit the motorway network within about 5 minutes of leaving the garage. From there, A‑8 takes you east toward Bilbao and west toward Oviedo, and the inland roads climb quickly into Cantabria’s valleys and Picos trailheads. This is where having a car cuts the faff: buses into places like Potes or San Vicente de la Barquera can be infrequent, especially outside August.
Pricing swings a lot by season; in August a compact can jump to several dozen euros per day, while in shoulder months you might see sub‑€20 day rates if you prepay online. Fuel in Spain currently sits below many northern European averages per litre, which helps if you’re covering 200–300 km days hunting surf or hikes. Check for one‑way drop fees if you’re thinking about collecting at SDR and returning in Bilbao or Asturias.
Regulars complain that the official AENA P1 right in front of T charges noticeably higher day‑rates than city garages, with comparison tools like Parclick flagging the gap. Leaving a rental sitting in P1 for 3–4 days quickly adds up, so long stops in Santander itself feel expensive if you keep the car idle. For pure city time, it’s usually cheaper to hand the keys back and go on foot or by taxi.
Frequent drivers often return the hire car at SDR, then park privately in Santander at spots like SABA Estación Santander near the railway station, where multi‑day deals undercut P1’s official prices. Others skip a second rental day and just use the €2–€3 airport–city bus instead. One practical tip: photograph the fuel gauge and odometer at pickup in the garage, then again at drop‑off, so any refuelling debate stays short.