United Airlines and Star Alliance fares from San Francisco to Athens are as low as $660 round trip for departures from January through April. There are many available dates, including weekends at low fares. This route has been one of the low fare spots to Europe from California with fares the past few months in the $760s flying United, Lufthansa and Swiss. Star Alliance fares allow return flights into July 2016.
Delta comes in even lower for late spring departures at $645 round trip. The Delta fare allows for even longer stays with return flights to SFO as late as July or August for under $700 round trip.
Oneworld Alliance carriers are about $100 more round trip.
Delta Airlines San Francisco SFO – New York JFK – Athens ATH
$644.26 Saturday April 30 – Sunday May 8, 2016
United Airlines/Aegean Airlines
San Francisco SFO – Paris CDG – Athens ATH – London LHR – SFO
$703.06 Sunday April 3 – Thursday April 14, 2016
Star Alliance carrier Swiss Airlines has lower fares around $660 round trip. The Mileage Plus advantage of Swiss Economy K is the opportunity to earn 50% flight miles rather than miles for base fare purchase price of $535.40 for this United Airlines ticket.
Mileage Plus non-elite members earn 6,860 redeemable miles in Mileage Plus with Swiss Airlines ticket compared to 2,677 redeemable miles flying on a United ticket.