Bertil Bjällby was born on 15 May 1908 and was from Stockholm.

Before volunteering for service in Finland, he served as a conscripted Furir (sergeant) at F2.

He volunteered for service in Finland during the Winter War.

In Finland, he served as a pilot at F19 (SFK no. 890).

He received the Finnish Flying Badge "Honoris Causa" n:o K 50 on 28 January 1940.

When he returned to Sweden, he continued to serve in the Swedish Air Force at F2.

He was killed in a flying accident on 7 November 1942 in a Saab B-17S from F2, which crashed at Ullnasjön, Täby, probably due to a faulty elevator.

Sources:
F19 - en krönika - Greger Falk, Svensk flyghistorisk Förening, Stockholm, ISSN 0345-3413
Svenska Vingar 4 "IN MEMORIAM" - Bo Widfeldt kindly provided by Håkan Svensson.
Additional information kindly provided by Jari Lappalainen and Håkan Svensson.