The airline will increase the service from three times daily to four times daily from 25 October as part of its winter 2015 schedule.
Outbound services will depart Luton at 7:50am, 12:20pm, 5:25pm and 9:20pm, landing in Copenhagen at 10:40am, 15:10pm, 20:15om and 12:10am.
Ryanair has been rapidly expanding its London routes this year and launched six new routes from Stansted in January.
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