Flying with People's from Vienna Intl to Thal St Gallen-Altenrhein is the cheapest flight we could find at S$ 429 per ticket. This is an international round-trip flight with 0 stops. The least expensive one-way international People's flight is: -Thal St Gallen-Altenrhein to Vienna Intl, -0 stops, -S$ 502 per ticket
People's does not have flights from Singapore Changi at the moment. There are scheduled flights with People's out of Vienna Intl though (if you don’t mind flying from this airport). Flying with Ryanair is recommended if you still want to fly from Singapore Changi.