Stansted Express will add an extra 13 services per week to its timetable, starting on January 2.
A 12.30am early morning Stansted to Liverpool Street train, which currently runs only on Mondays, Fridays, Saturdays and Sundays, will operate daily. As well as this, 1am and 1.30am departures will run on Mondays, Fridays and Saturdays.
From the town centre into the airport there will an extra 3.40am train from Liverpool Street to Stansted on Mondays.
The 4.30am Monday, Friday, Saturday and Sunday service will be re-timed to depart at 4.10am, and the daily 4.55am service will depart at 4.40am
Sunday 5.25am and 5.55am departures from Liverpool street will change to 5.10am and 5.40am.
A full timetable can be viewed at www.stanstedexpress.com.