When are you going? I assume before mid September if you are mentioning train.

You can check PJ's Taxi in Seward. I think the price is $300+ one way. They will pick you up in Anchorage and drop you off anywhere in Seward. Talk with Renee.

There is also a bus service that might be of interest.

Are you just going one way to catch a cruise in Seward? Seward is definitely worth spending some time in. With the train, you can arrive in Seward about 11am and take a 6 hour Kenai Fjords tour. Well worth it - you get closer to marine wildlife and glaciers than you would on your cruise ship. Just a thought.