Bus from Portland to Seattle-Tacoma Airport

Seattle-Tacoma International Airport is the main departure point for long-haul and international travel from the Pacific Northwest, served by a wide range of carriers across North America, Europe, and Asia. For travellers based in Portland, it is a realistic option for routes and fares that may not be available from Portland International Airport.

FlixBus runs directly from the Pearl District curbside stop to the arrivals kerb at SEA-TAC, with no transfer needed.

Three hours on the road plus time to clear security means you need to plan ahead. For most international flights, building in six or more hours between your bus leaving Portland and boarding gives reasonable headroom. For domestic departures, five hours is a sensible minimum.

Getting to the FlixBus stop in Portland

The departure stop is at 1090 NW Station Way, a curbside bay just north of Portland Union Station on the far side of Broadway Bridge. The stop is in the Pearl District on the western bank of the Willamette, north of the downtown core.

The nearest MAX Light Rail station is Union Station/NW 5th & Glisan, a short walk south of the bus stop. TriMet runs the following lines from there:

• MAX Light Rail (Green, Yellow, Orange Lines): all three serve the Union Station platforms on NW 5th and 6th avenues. Trains from the Lloyd District, the inner eastside, Milwaukie, the Mississippi neighbourhood, and the Expo Center area all converge here. Real-time departures are in the TriMet app and on platform screens.
• Portland Streetcar (A Loop and NS Line): both loops pass through the Pearl District and stop within walking distance of Union Station. Useful from the South Waterfront or the Central Eastside.

The journey to SEA-TAC

The bus follows Interstate 5 north the whole way to SEA-TAC, with a journey time of around three hours. Seats are allocated, so your place is guaranteed when you book.

Power outlets at every seat and free Wi-Fi mean you can sort last-minute travel admin, check in for your flight online, or just decompress before the airport.

Arriving at SEA-TAC

FlixBus arrives outside Door 2 on the arrivals level in the Main Terminal, at the south end of the baggage claim level. Follow signs up one level to Departures and the check-in halls. SEA-TAC operates a single terminal with six concourses (A, B, C, D, N, and S). An internal train system connects the central terminal to the concourses on both the north and south ends. International departures use the South Satellite exclusively; domestic gates are spread across the remaining concourses. Confirm your gate before heading to security.

Security queues vary considerably by time of day. International morning departures between 5 am and 9 am tend to be the longest. TSA PreCheck and CLEAR lanes move significantly faster for enrolled travellers. Airlines generally recommend arriving at least three hours before international departures and two hours before domestic ones.

Buses from Portland to SeaTac

Find the cheapest buses from Portland to SeaTac

It couldn't be easier to book your travel from Portland to SeaTac with FlixBus - and when you book in advance, you can save money too! Make your journey even easier with the FlixBus app. All your information will be saved for the next time you travel.

What to expect onboard the FlixBus bus from Portland to SeaTac

Traveling from Portland to SeaTac is stess-free, clean and comfortable - and it couldn't be easier to book a ticket. You can book online via the website, on our app, in person at a FlixShops or at resellers.
We accept card payment as well as Paypal, Google Pay and Apple Pay, but there are many more payment options that you can choose from. The easiest way to book your ticket is using our app. You'll be able to make your reservation within seconds and there's no need to print and carry the ticket with you, as your phone will be your ticket.

Want to sit beside family or friends or keep the space beside you free? Need easy access to the toilet or a table to get on with some work whilst traveling? You can reserve a seat when you book on the app or website, and you can choose from a variety of seat options. Once you're settled in your seat, you can sit back and relax with plenty of onboard services to help you make the most of your trip. Most of our buses have onboard Wifi so you can catch up on your favorite shows, chat with your friends or listen to music and podcasts. We've also got toilets onboard, as well as power outlets.
What's more, you get a generous luggage allowance when you travel with FlixBus with one carry-on bag and one checked bag, so you can bring everything you need for your trip.