The F.III was first used by KLM when they re-opened their Amsterdam-London service on 14th April 1921 (they did not, at this time operate over winter). Soon, F.IIIs were also flying on routes to Bremen, Brussels, Hamburg and Paris. They proved to be very reliable aircraft. KLM received 14 F.IIIs from Fokker's German factory at Schwerin during 1921 and built two more itself from spares in the following year. This final pair used 268 kW (360 hp) Rolls-Royce Eagle VIII engines, with the pilot on the left.
Another operator of new F.IIIs was Deutsch-Russiche Luftverkehrs Gesellschaft (Deruluft) who used nine aircraft on their Berlin-Königsberg-Moscow route from May 1922. These machines, partially built in Schwerin and finished in the Netherlands at Veere, had Eagle engines. One was a Fokker-Grulich.
Deutsche Aero Lloyd gained a licence to build F.IIIs as they had for F.IIs and the company, with its southern subsidiary built and operated eighteen of these Fokker-Grulich F.IIIs. Most of these used BMW engines, typically the 186 kW (250 hp) BMW IV in preference to the 138 kW (185 hp) BMW IIIa. Some of these were re-engined with the 239 kW (320 hp) BMW Va, and were designated F.IIIc.
Another operator from new was the Hungarian airline Malert, who received six Dutch built aircraft for their Budapest-Vienna-Belgrade service from 1922 to 1929. These initially had BMW IIIa motors, but later ran with 172 kW (230 hp) Hiero IVs. They had larger wings, increased in area by about 14 percent. Deutsche Luft-Reederei also operated two, originally intended for KLM. Four F.IIIs probably went to the United States.
Later F.IIIs changed ownership frequently as airlines went bankrupt or merged. They were still flying commercially in Germany until about 1936.
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