| Cheap Flights: Austin to Shannon, Ireland $598 r/t [September-March] (Long 5-hr connection in London) â British Airways / Aer Lingus / Finnair / Iberia British Airways, Aer Lingus, Finnair, Iberia and various other airlines have round-trip flights from Austin (AUS) to Shannon (SNN) for $598 with a connection. Flights September to March. Departures on Monday, Tuesday, Wednesday, and Sunday. 7-day minimum stay required. The outbound flight has a long 5-hour connection in London. Click for more details and booking links Cheap Flights: Austin to Shannon, Ireland $598 r/t [September-March] (Long 5-hr connection in London) â British Airways / Aer Lingus / Finnair / Iberia . | 
