The cozy passenger ship De Zuiderzee sails a regular service to Urk in the summer months and vice versa. From about the end of June to about the beginning of September you can sail to Urk twice a day, except Sunday. The Zuiderzee also provides day trips for families, companies and school trips. For the various packages on board the ship, you can already book from April.
For exact times and prices, we refer you to the website of De Zuiderzee.