During World War II, Bad Kissingen was declared an "open city" and escaped Allied bombing.

With all of its sanatoriums, hotels and nursing homes, the city served as a rest center for sick and injured German soldiers.

On 6 June 1945 the Headquarters of Ninth Air Force moved from Chantilly, France to Bad Kissingen.

On 17 February 1953, pursuant to GO #1, Hqs USAREUR, Manteuffel Kaserne was redesignated as Daley Barracks in honor of Technician Fifth Grade William T. Daley, HHB, 94th Rcn Sq (Mecz), who was awarded posthumously the Distinguished Service Cross for extraordinary heroism during World War II.

The local glider club Segelfluggemeinschaft Bad Kissingen constructed a civil airfield approximately 1 km north of the City.