Refitted with SPADs and renamed Escadrille Spa.155, it was bundled into the larger Groupe de Combat 18 in January 1918.

By war's end Escadrille Spa.155 was credited with the destruction of 13 enemy airplanes and an observation balloon.

The squadron was updated to Nieuport XXVII fighters in November, then re-equipped with SPADs the next month.

The Groupe, including Escadrille Spa.155, operated in support of half a dozen French field armies during mid-1918.

In the aftermath of the Saint-Mihiel offensive, the Groupe moved to support IV Armee on 24 September 1918.