Update (March 14, 2013):  $399 is gone, but there’s a pretty good fare on Air France “Super Spring Sale.”  Purchase before March 26 — as low as $667 New York >< Istanbul round-trip.  Departures through April 30.  I found March 30 >< April 10 @ $691.  Most fares are just under $710.

Update (February 20, 2013):  We’ve been posting about cheap fares to Istanbul since last November, but this one is unbelievable and not well promoted.  Buy tickets and start travel by March 7, 2013.

Turkish Airways has a $399 fare from Washington, D.C. (IAD) to Istanbul (IST) on its non-stop Flight 8, returning on its non-stop Flight 7.

As of today, the possibilities include

• Depart February 24 for 6, 7, 8, 9, or 10 nights
• Depart February 25 for 5, 6, 7, 8, or 9 nights
• Depart February 26 for 5, 6, 7, or 8 nights
• Depart February 28 for 5 or 6 nights
• Depart March 6 for 5, 6, 7, or 12 nights.

To explore flight options, use Matrix selecting “See calendar of lowest fares.”  For “Length of  stay,” I used a date range of “5-12,” but plug in whatever works with your schedule.  Select “Nonstop only” for “Stops.”

To explore other cheap options to Istanbul ($567 KLM from Chicago, $441 Delta from D.C., $494 from Newark, etc.) use our favorite airfare sleuths at The Flight Deal.