Budapest offers a few relatively low-budget sightseeing options for tourists. One of them is a local branch of a global player, BigBus Budapest. They operate double-decker buses with over 26 stops in the city where passengers can hop on and off. The tour (as of Jan 2018) offers 4 routes each between 60 and 140 minutes long. Guiding is offered in 16 languages: English, Spanish, French, German, Italian, Hebrew, Japanese, Chinese, Portuguese, Russian, Polish, Finnish, Arabic, Greek, Turkish and Hungarian. Tickets are valid for 24 hours, and the basic sightseeing by bus can be extended by a boat-tour and a night tour for extra cash. Tickets start from 18 Euros for adults and top at 30 Euros for all extras (night tour, river cruise, castle shuttle, walking tour) included.
City Sightseeing Budapest is a local business offering sightseeing services with double decker or open-top buses on four lines and one river boatline. Their tickets are valid for 48 hours by default, but buying an extra “night-tour” add-on automatically extends it to 72 hours. City Sightseeing offers bonus booklets which include 20-60% discounts for over 40 venues in Budapest. Their base price starts at 18 Euros for adults, and increases progressively by adding extras.
A third company offering city tours by bus is Official Hop On Hop Off with a slightly different portfolio of routes and prices. They run buses on 6 routes with 53 stops. Guiding is offered in 22 languages. A basic ticket allows for an unlimited usage of the service for 24 hours at 21 Euros. Optional extras include a Funicular Return Ticket, a night tour and a castle shuttle bus. Tickets include coupons that offer 10-50% discounts at select restaurants and shops.