1037 – An inscription mentioned Airlangga having built dams on the Brantas River and developed the port of Hujung Galuh, which is located on or near present-day Surabaya.[1]
September–December – Extensive strikes in Surabaya's engineering companies, culminating with the banning of Surabaya's railway workers' union.[22]
18 June 1927 – The Soerabajasche Indonesische Voetbalbond (today Persebaya) was established.[15]
1930 – Surabaya's population was recorded to be 341,700.[23]
1940s
1942
3 February – First Japanese air strike against the city.[24]
18 February – Dutch coastal defense ship HNLMS Soerabaja and submarine HNLMS K VII were sunk by Japanese bombers in Surabaya harbor.[25]
1 March – The Imperial Japanese Army—the 48th Division and part of the 156th Mixed Infantry Brigade—invaded East Java, with Surabaya as the primary objective. The Dutch surrender was signed before fighting occurred in the city.[24]
surabaya.go.id, Pemerintah Kota Surabaya. "Demografi Kota Surabaya". www.surabaya.go.id (in Indonesian). Archived from the original on 2019-04-01. Retrieved 2019-04-01.