| Cheap Flights: Austin to Helsinki $474 r/t [May-May, Sep-Oct] â KLM KLM has round-trip flights from Austin (AUS) to Helsinki (HEL) for $474 with a connection. Flights March, April, May, September, and October. Departures on Monday, Thursday, and Saturday. 7-day minimum stay required. Flight may operate as a Delta code-share. Click for more details and booking links Cheap Flights: Austin to Helsinki $474 r/t [May-May, Sep-Oct] â KLM . | 