The Suica card can be used in the majority of Japanese public transport: subways, buses and all local trains, as well as in buses and taxis displaying the Suica logo. Please note that the Suica card does not work on express trains, shinkansen, highway buses or airport shuttles.

While the Suica card is one of the most versatile IC cards in Japan, it cannot be used on literally "all" trains. It is perfectly suited for most major urban networks, including JR lines, subways, and buses in Tokyo, Osaka, Kyoto, and Nagoya. However, you generally cannot use it for long-distance Shinkansen (bullet train) travel unless you specifically link your card to a digital ticket via the "Smart EX" or "JR East" apps. Furthermore, Suica cannot be used to travel between different IC card regions (for example, taking a local train from Tokyo to Sendai). Some small, rural private railways and cable cars also still lack IC card readers, requiring cash or physical paper tickets. Additionally, for "Limited Express" trains that require a reserved seat, Suica only covers the base fare; you must still purchase a separate physical or digital limited express ticket. In 2026, while the mutual usage agreement makes it the gold standard, always carry a small amount of yen for those few "off-the-beaten-path" local lines.