Air France and SkyTeam airlines have San Francisco to Vienna on sale for $416 round trip for departures from January 14 through May 6. Add $84 for self-selected advance seat reservations for four flights ($32 each transatlantic and $12 each European segment). Checked bag adds $60 each way.
Air France San Francisco SFO – Paris CDG – Vienna VIE – CDG – SFO
$415.67 round trip economy light Sun March 31 – Tue April 9
