Seward cannot currently handle larger ships. However the owners of the Seward cruise port announced its expansion back in 2022 and recently gave updated plans with an expected completion of spring 2026. In the promotional materials for the project they have rendered picture of the completed port with a Quantum class ship docked. This project is in conjunction with RCCL and the plans are for the ability to handle two ship at the same time, and the ability to handle quantum class ships.
I am planning on booking a B2B or a cruise with post cruise tour during the quantum class’ inaugural season to Seward. Fingers crossed it’s the 2026 season.