Icelandair will increase capacity from Glasgow and Reykjavik and Glasgow next year.
The carrier will add an extra frequency from March 19, 2016, which will increase the route to six-times per week compared to the current five weekly.
The additional outbound/return flights will depart on Saturdays and will be operated by a B757-200 aircraft.
Outbound service FI430 will depart Reykjavik at 07.35 and arrive in Glasgow at 09.40. Return leg FI431 will leave Glasgow at 14.05 and land in Reykjavik at 15.25.
Andres Jonsson, Icelandair's general UK manager, said: "Demand from our longest serving international gateway is strong and we look forward to offering more options of flying to Iceland and connecting into our network to US and Canada."
Icelandair will also launch a year-round, four-times weekly service between Reykjavik and Aberdeen next year.