Delta, Air France and KLM will fly you from Los Angeles LAX or San Francisco SFO to Istanbul round trip for $683 to $694 on most dates for departures from October 3 to March 20, 2016. The exception is most of December and first week of January are higher priced. These low fares price for all Air France operated flights via Paris or all KLM flights via Amsterdam.
Air France Los Angeles LAX – Paris CDG – Istanbul IST
$694 Tuesday November 10 – Tuesday November 17
Many itineraries offer the option to overnight in Amsterdam or Paris.
Air France San Francisco – Paris CDG – Istanbul IST
$683.14 Friday February 5 – Saturday February 13