The public transport system in Belgium is fairly well organised and quite affordable. It's absolutely the cheapest solution to get you from the airport to your destination and for general travel. A day pass to the local public transport system is often cheaper and faster then a taxi or an Uber for a single ride.

The cheapest way to travel within Belgium in 2026 is by utilizing public transport with contactless payments or specialized rail passes. For urban travel in Brussels, the STIB/MIVB network (metro, tram, bus) allows for contactless payment via credit card or smartphone, with a daily spending cap of €8.50—meaning any travel after your fourth journey that day is free. For inter-city travel between hubs like Bruges, Ghent, and Antwerp, the SNCB/NMBS rail system is the most cost-effective. Young travelers (under 26) can use the "Youth Holidays" pass, which offers unlimited rail travel for a week or a month at a very low rate during school breaks. For adults, the "Local Multi" (formerly Key Card) is excellent for short-distance trips, while the "Standard Multi" (Rail Pass) offers 10 journeys anywhere in Belgium for a fixed discounted price. If you are on an ultra-budget, FlixBus often provides even cheaper fares for regional connections (starting at around €5), though it lacks the speed and frequency of the Belgian rail network.