Seward is about 200 km south of Anchorage, accessible by two excellent but very different routes.
By car: The Seward Highway follows Turnagain Arm from Anchorage before climbing into the Kenai Mountains. The drive takes about 2.5 hours in clear conditions and is one of the most scenic drives in Alaska — the arm has dramatic bore tides, Dall sheep often visible on the cliffs, and bald eagles overhead. The road is well-maintained but can be icy in winter.
By Alaska Railroad: The train from Anchorage to Seward runs daily in summer (mid-May to mid-September). The 4.5-hour journey through mountain terrain is one of North America's great rail experiences. Book well in advance for summer travel.
From Anchorage airport: Rental cars are the most practical option if you are flying in. Several shuttle services also run between Anchorage and Seward in summer, bookable online.
Seward is the southern terminus of the Alaska Railroad and a departure point for cruise ships — in summer the small harbor area fills with ship passengers, so expect crowds around the boat dock on days when ships are in port.