Ports · June 22, 2026
They run under one alliance but land in different places. Here's what that means for your container.
If your cargo is routed through the Pacific Northwest, it's arriving at the Northwest Seaport Alliance (NWSA) — the combined operation of the Ports of Seattle and Tacoma. They market together, but physically they're about 30 miles apart with different terminals, and which one your box lands at changes the drayage. Here's the practical comparison.
The NWSA splits into the North Harbor (Seattle) and the South Harbor (Tacoma). Your steamship line and service decide which harbor your container discharges at — it's not usually something you pick. What you can control is having a carrier who works both, so the harbor doesn't dictate your options.
Seattle's container terminals — Terminal 5, Terminal 18 and Terminal 30 — sit on and around Harbor Island and the SODO district. T18 is the largest box terminal in the region, and the rebuilt T5 handles the biggest vessels on the West Coast. From our Kent yard, the Seattle terminals are roughly 20 minutes north. See our Port of Seattle drayage page for the terminal detail.
Tacoma's terminals — Husky Terminal, Washington United Terminals (WUT) and Pierce County Terminal (PCT) — handle a large share of the region's containerized imports. From Kent, the Tacoma terminals are about 25 minutes south. See our Port of Tacoma drayage page for the specifics.
The honest answer: with the right carrier, it shouldn't matter much. Our Kent hub sits almost exactly between the two harbors, so whether your box lands at Seattle or Tacoma the dray is short and the empty returns fast. We dispatch against every terminal in both harbors daily — so you book one carrier, not two, and the harbor your line chose never becomes your problem. (For the North Sound, the independent Port of Everett rounds out the picture with breakbulk and project cargo.)
Not in the way people expect. The two harbours are one alliance and the terminal charges are set the same way, so the difference in a drayage quote is almost never the port — it is the geography of your delivery and the state of the gate on the day.
Where your freight is going decides it. For the Kent Valley — Kent, Auburn, Sumner, Fife, Puyallup, where most of the region's distribution sits — the two ports are close to equivalent, with Tacoma marginally shorter to the southern half of the valley. For anything going south on I-5 (Portland, Salem, the Willamette Valley) Tacoma is about thirty miles closer, and on a same-day lane that is real money. For anything going north — Everett, Marysville, the North Sound — Seattle wins by the same logic. For anything going east on I-90 to Spokane or beyond, they are effectively identical: the box joins the same freeway at the same place either way.
What genuinely changes cost between them: gate congestion on the day, appointment availability, chassis availability for your steamship line, and where the empty has to go back. An empty that has to return to a different terminal than the one it came off is a second move, and that is a bigger swing than any per-mile difference between the harbours.
What does not change cost: the port name on its own. A carrier quoting you materially more for Seattle than Tacoma on the same delivery address is quoting you their own convenience.
Full breakdown of how a dray is actually priced: drayage rates at Seattle and Tacoma.
Where you can choose — and on many services you cannot, because the vessel calls where it calls — the order of importance is: vessel schedule first, delivery geography second, everything else a distant third. A booking that lands three days earlier at the "wrong" port beats a perfect terminal choice, every time. If you are weighing it for a specific booking, ask us before you confirm; it takes two minutes and we have no reason to prefer one over the other.
They operate jointly as the Northwest Seaport Alliance but are physically separate — Seattle is the North Harbor, Tacoma the South Harbor, about 30 miles apart with different terminals.
Usually not — your steamship line and service determine the harbor. What you control is using a drayage carrier that works both so your options aren't limited by the choice.
Neither, with the right carrier. A Kent-based fleet sits between both harbors, so the dray is short from either one.
Yes — we dispatch daily against every container terminal at both the Seattle and Tacoma harbors, plus the Port of Everett.
Get a quote from either port →
Only because of where your freight is going. For deliveries south on I-5, Tacoma is about thirty miles closer and that shows in the rate. For deliveries north, Seattle is. For the Kent Valley and for anything heading east on I-90, they are effectively the same.
They operate as one alliance and volumes shift between them with vessel services. The question worth asking is not which port is busier overall but which terminal has gate appointments on the day your box is due out.
Sometimes, at booking, if your carrier offers services into both. Usually the vessel schedule decides and it is not worth optimising against — a booking that lands earlier at either harbour beats a later one at your preferred one.
Tell us what you are moving and a dispatcher replies the same day.