You can climb Sigiriya without a tour: buy a ticket at the counter and follow the path. What a booking adds is a guide who can explain what you are walking through, transport if you are coming from Kandy or Colombo, and the experiences around the rock — Pidurangala in the dark, a jeep in the elephant parks, a lunch in a village kitchen — that are awkward to arrange on the spot.
Everything here is booked through GetYourGuide, with live availability, free cancellation on most options and reserve-now-pay-later on many. Prices are indicative "from" prices in US dollars and move with the season. Entrance fees are usually not included in guided tours and day trips: expect to pay around US$35 for Sigiriya at the gate unless the listing clearly says otherwise.

