Marked ADA spaces sit closest to the Main Terminal elevators
Accessible Parking at Seattle–Tacoma International Airport sits in the on-site parking garage, directly across from the Main Terminal, with ADA spaces concentrated near elevator cores on every level. You park under cover, then roll or walk across the skybridge level into ticketing and security in roughly 5–10 minutes, depending on airline and checkpoint lines.
The garage is open 24/7, and Accessible Parking is charged at the standard on-site garage rate, which often runs around $37 per day but varies with duration and any current promotions. You don’t need a reservation for a marked ADA spot, but you do need a valid disabled parking placard or plate clearly displayed to use the closest stalls near the terminal.
Level 4 is the key level: it lines up with the Main Terminal skybridges and has the highest density of ADA spaces near elevators A, B, and D. If you’re flying Alaska from the Main Terminal north end, elevator core A or B on Level 4 usually gives the shortest, flattest route to security; international flights in the S Concourse still start with the same Level 4 walk before you train over.
Sea-Tac posts height limits for the garage at about 6 feet 10 inches, which can be tight for some wheelchair vans with raised roofs or racks. Oversized vehicles with placards may need to use off-site or surface options instead of the on-site garage if they exceed that clearance, so check your vehicle height before you commit to the ramp.
One practical tip: write down your garage floor and elevator core (for example, “Level 4 – Core B”) in your phone before you head across the skybridge; the Accessible Parking rows look similar, and this saves a tired search on the return.