Shonai Airport (庄内空港, Shōnai Kūkō) (IATA: SYO, ICAO: RJSY) is an airport, located in Sakata and Tsuruoka, which are cities facing the Sea of Japan in Yamagata Prefecture, Japan.

The airport opened in 1991 after lobbying efforts by local chambers of commerce, as the area was highly isolated from the major cities of Tokyo and Osaka, requiring half a day of travel to reach either.

Seiko Epson has also used the airport for weekly employee charter flights to and from Matsumoto since 1997.

In December 2012, an ANA flight landing from Tokyo overran the runway at Shonai.

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