Bank of America · $450/year · Seattle

Does Alaska Airlines Visa Signature Lounge+ Card get you into SEA lounges?

Yes — 3 lounges at Seattle–Tacoma International (SEA).

Here's every lounge at SEA that Alaska Airlines Visa Signature Lounge+ Card opens, grouped by network, with the exact access rule for each. All access is unrestricted for the cardholder.

Lounges you can enter at SEA

Alaska Lounge 3 lounges

Unlimited Alaska Lounge+ membership — cardholder + 2 guests (or immediate family). Also includes partner lounges worldwide.

Alaska Lounge — Concourse C
Alaska Lounge — Concourse D
Alaska Lounge+ — N Concourse (flagship)

Before you walk to the lounge

Terminal check: the mapped lounges for this card at SEA sit in Concourse C, Concourse D, N Concourse (flagship). Moving between terminals can require extra time or security re-entry.
Same-day travel: most lounge networks require a same-day boarding pass, and airline clubs may require travel on that airline or a partner.
Guest policy: free guests are not universal. Check the card rule beside each network before promising entry to a travel companion.
What this card does not get you: no published visit caps are marked for these matched networks, but capacity controls and one-off closures can still block entry.