Commissioned in November 1944, after sea trials and modifications Loch Fyne joined the 18th Escort Group on 22 December to support convoys on the UK–Gibraltar route.

After a refit, in September 1945 she sailed for service with the East Indies Escort Force in the Indian Ocean, repatriating former prisoners of war and internees, and was deployed for Air-Sea Rescue duties while based at Trincomalee.

She sustained damage due to a premature depth charge explosion during sea trials, and so did not join the flotilla until April, to take part in the search for missing submarine HMS Affray.

In December Loch Fyne and the cruiser Ceylon were at Aqaba when British troops withdrew from Jordan, and she then returned to Devonport to refit.

[1] Loch Fyne returned to Bahrain in July 1959 for continuing duty in the Persian Gulf as part of the 9th Frigate Squadron, carrying out patrols and exercises.

[1] A routine docking at Karachi in June 1961 was cancelled, and ship quickly returned to the Persian Gulf to join Task Force 317 as part of "Operation Vantage" following threats to Kuwait's independence from Iraq.

The 1963 programme included the usual patrols and exercises in the southern Gulf, and visits to Dalma, Bombay, Al-Hallaniyah, Mombasa, and Tanga, before returning home in April, arriving at Devonport to decommission on 6 May 1963.