I visited Kinugawa-Onsen (Kinugawa hot spring) with my family in March. We used Tobu line. The ticket, Asakusa to Kinugawa-Onsen costs 2890 yen ($25.25 €22.92). It includes the basic fare and the express fee. The limited express is called "Spacia" and the following car is used.
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The below is the ticket.
Kinugawa hot spring is located near Nikko. It takes 2 hours from Tokyo to Kinugawa by the express train "Spacia".
Image: Kinugawa-Onsen station