Condor Voyager sailings over the next few days have been rearranged because of a lack of cabin crew.
It's the latest company to be affected by staff shortages.
The high speed sailings affected are between St Malo, Jersey, Guernsey and Poole from today (Wednesday 8 September) until the end of the week (Sunday 12 September).
They will all leave and arrive earlier than first scheduled.
Condor says it sincerely regrets any inconvenience caused, but these changes will make sure everyone reaches their destination on the day they've booked.
It adds that Covid has had a significant impact on travel and tourism over the past 18 months, and it's working hard to maintain reliable services with reduced crew levels
"Passengers are being transferred to amended times on the same day as their original departure in order to avoid us cancelling services. If they are happy with the time changes they need not contact us." - Condor Ferries
Details of the rescheduled services can be found here.

Holes dug at Guernsey park spark discussion
Alderney Electricity to brief States on oil price volatility
SGB Hire CI ceases trading
States release timeline for Guernsey's April by-election
Guernsey water main replacement falls behind schedule
Lucy Beere withdraws from Commonwealth Games selection
Agreement reached with Fermain Café tenants
Guernsey mum given £11K shock fine over improper disposal of batteries