| Nonstop Flights: Austin to Frankfurt $489-$526 r/t [April] â Lufthansa / United Lufthansa has round-trip flights from Austin (AUS) to Frankfurt (FRA) for $526, NONSTOP. Flights in April. Departures on Monday, Wednesday, and Friday. Extended weekends available. Flight may operate as a United/Lufthansa code-share. Note: Some small OTAs on Skyscanner have this for about $489. If you plan on booking there, beware of any site that charges a fee to cancel a ticket within the 24-hour âfreeâ period. Use unknown booking sites at your own risk. Click for more details and booking links Nonstop Flights: Austin to Frankfurt $489-$526 r/t [April] â Lufthansa / United . | 