| Cheap Flights: Austin to Istanbul $684-$709 r/t [November-March] â Lufthansa / United Lufthansa has round-trip flights from Austin (AUS) to Istanbul (IST) for $703 with a connection. Flights November to March. Fare is Regular Economy. Not Basic. Carry-on, checked bag, and seat selection are included without an additional fee. Note: Some small OTAs on Skyscanner have this for about $684. 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 Cheap Flights: Austin to Istanbul $684-$709 r/t [November-March] â Lufthansa / United . | 