Bus 304 ties ACH straight into the Rorschach rail hub
Every day, Bus 304 runs between Altenrhein Flughafen stop and Rorschach in a few minutes, plugging Sankt Gallen Altenrhein Airport (ACH, single terminal T1) into the regional train network around Lake Constance. The stop you want is directly by the airport access road, usually signed as “Altenrhein, Flugplatz” or similar on local planners, not a big airport-branded stand.
From Rorschach station, trains run at regular intervals toward St. Gallen, Romanshorn and other Lake Constance towns, with total Altenrhein–St. Gallen travel times often around 35–45 minutes when you combine Bus 304 and rail. Regional trip planners for Altenrhein–St. Gallen almost always show a short bus hop to Rorschach, then a quick S-Bahn into St. Gallen HB.
Bus 304 works like any standard regional bus in the St. Gallen network, not a special airport coach, and you pay normal zone-based fares between Altenrhein and Rorschach. Expect a short ride of roughly 10–15 minutes to the rail hub, depending on the exact routing and intermediate stops on that run.
For planning, check current departure times for Bus 304 in the SBB Mobile app or on the national timetable, using “Altenrhein, Flugplatz” to “Rorschach” or “Rorschach, Bahnhof” as your search. In timetables, you may see connections paired so that a Bus 304 arrival at Rorschach lines up with an S-Bahn onward to St. Gallen or toward other Lake Constance destinations within 10–20 minutes.
Regulars treat Bus 304 as just the first leg of a normal bus+train chain, not as a branded “airport express”, and they build their connection around the train they want out of Rorschach. Many trip examples online show exactly that pattern: short Altenrhein–Rorschach bus, straight onto an S-Bahn for the main inland stretch.
Practical tip: when timing your flight arrival into ACH, aim to hit a Bus 304 that gives you at least one train backup at Rorschach (for example, two S-Bahn options within 30–40 minutes) so a short delay at baggage in T1 doesn’t wreck your onward plan.