Denmark recognized Finland on 10 January 1918 and the two countries established diplomatic relations on 18 February 1918.

After the establishment of diplomatic relations in 1918, Armas Saastamoinen was appointed envoy to Denmark and played an important role in fostering relations between the two countries.

[2] He assumed his role in October 1918, after having been Chargé d'affaires since April same year.

During the Winter War, over a thousand Danes volunteered to fight on the Finnish side, even though only some pilots reached the frontline before the end of the war.

After the war, when Finland joined the Nordic Council in 1955, contact between the two countries intensified.