How long should your cruise be?

Distance decides, not the clock

Seward sits at the head of Resurrection Bay, a long, deep inlet that stays free of ice all year. The national park starts beyond its mouth, along a coast of fjords carved by the ice of the Harding Icefield. Every cruise from Seward first runs down the bay, and what you see after that depends on how far past the mouth the boat keeps going. A short trip turns back inside the bay. A longer one crosses open water of the Gulf of Alaska to reach the glaciers that end in the sea.

So read the hours as a proxy for miles. Each step up in length buys more coastline and better odds at whales and ice, along with more time in the swell.

Four hours in Resurrection Bay

Kenai Fjords Tours' Resurrection Bay half day, from ~$150, keeps mostly to the sheltered water of the bay for about 4 hours (GetYourGuide lists 4.5). The captain narrates while a wildlife guide points things out, and a hot lunch is served on board. From out in the bay you see Bear Glacier, the largest in the park, plus sheer cliffs with waterfalls running off them. Sea lions and sea otters are regulars, and puffins may turn up near the mouth.

What it leaves out is a tidewater glacier face, the wall of ice where chunks break into the sea. Whales come into the bay less often than they feed along the outer coast, though one Viator reviewer had orcas and a fin whale on the half day. No sighting is promised on any route. The bay is calmer than the open gulf, but the water near its mouth can still get lumpy.

Six hours to a tidewater glacier

The 6-hour cruises leave the bay behind, run along the open coast and enter the national park to reach one tidewater glacier. Major Marine's 6-hour cruise, from ~$287, heads for Holgate Glacier by way of the seabird colonies of the Chiswell Islands, about 100 miles (160 km) there and back. Kenai Fjords Tours' 6-hour park cruise, from ~$230, reaches a tidewater glacier as well as the rookeries of the Alaska Maritime National Wildlife Refuge.

This is the length most first-time visitors book, and for good reason. You see the ice up close and spend time in the waters where humpbacks and orcas tend to show up. You are still back in Seward by the afternoon. The price for that is the open-water crossing around the capes. People prone to motion sickness should read our seasickness guide first, and the glacier guide explains what happens at the ice face.

Seven or eight hours, deeper into the park

The full days add a second glacier or a farther fjord, and more time to wait for animals. Our pick, Major Marine's full day, from ~$319, spends 7.5 hours out, with a long stretch in Aialik Bay and two tidewater glacier stops, where ice may calve while you watch. A naturalist comes along. Kenai Fjords Tours' Captain's Choice, from ~$255, runs 7 hours, with the captain picking between Aialik and Holgate Glacier on the day from the weather and the wildlife reports.

The longest trip is the Northwestern Fjord tour, from ~$288, at 8 hours. Its listing calls it the only daily tour into that fjord, where three tidewater glaciers meet the water in one place. A light breakfast comes before the hot lunch, and the operator asks you to arrive an hour before departure. It also crosses the most open water of any cruise from Seward.

When the weather redraws the route

Whatever you book, the sea has a vote. When the swell runs high outside the bay, the captain may shorten the trip or swap one glacier for a calmer one, and fog can do the same. A 6-hour cruise on a rough day can end up feeling closer to a long bay tour. Captain's Choice builds this flexibility into the product, which suits travelers who would rather go where the conditions are good than chase a fixed glacier.

For this reason, people with only one possible day in Seward often pick a 6-hour cruise over a full day, since a shortened route costs them less. Calmer months help too, and the month-by-month guide has the details.

Which length for which traveler

• Families with young children. The Resurrection Bay half day, which Kenai Fjords Tours pitches at families. Our family guide covers ages and seasickness;
• Anyone who gets seasick easily. The half day too, as it stays mostly in sheltered water;
• First visit, one free day. A 6-hour cruise. Kenai Fjords Tours' version costs less, and Major Marine's adds a reserved seat in the heated cabin;
• Wildlife watchers with stamina. Major Marine's full day in Aialik Bay, our pick, for the time spent where the animals feed. The whale guide explains why the outer coast matters;
• Glacier lovers. Northwestern Fjord, for three tidewater glaciers in one fjord;
• Travelers who like to go with the flow. Captain's Choice;
• Day trippers on the train. A long cruise plus a round trip by rail makes a tight day, so check the timetable first in our Anchorage transport guide.

A shorter spring option

Visiting before the main season? Major Marine's spring wildlife cruise, from ~$123, is a 4-hour trip from Resurrection Bay out to the edge of the gulf, with gray whales on their migration and mountain goats with newborn kids possible on the cliffs. It only sails in spring and keeps to the bay and the edge of the gulf, so it never reaches a glacier face. Lunch is not included either. Once you know your length, the price guide lines up all nine fares by the hour.