This is due to major engineering work in Manchester and Leeds, the impact of COVID-19 and train crew availability.
Services will end from 19:00 on Christmas Eve and there are no trains running on Christmas Day. Improvement work will also be taking place across the network until early January.
A spokesperson for Northern said: “We advise passengers who plan to travel over the Christmas period to check their journey in advance - with their train operator or via National Rail Enquiries - and allow plenty of time.
“We’re sorry if anyone experiences disruption over the Christmas period.”
The operator is also asking customers to be considerate of others and wear a face covering, unless exempt, on trains and at stations.
Northern has more than 600 dedicated cleaning staff working on trains and at stations with a particular focus on touch points (tables, buttons, and toilets). The enhanced cleaning regime is designed to protect customers and staff by reducing the potential risk of transmission which is already proven to be extremely low on the rail network.
For full details of Northern’s timetables visit northernrailway.co.uk or nationalrail.co.uk