Widebody Transport
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution
Aircraft
At cruise; got a Hydraulic System (Hyd) 1 off alert.  With loss of quantity we ran the Hyd 1 off and Hyd 1 failure checklist.  Decided to land at [destination] using their longest runway.  Landed uneventfully.  Stopped and had fire crew look over our airplane.  They told us we had fluid leaking out of port side of airplane.  We shut down the engines and got a tow back to the ramp.  Old airplane
Hydraulic fluid in System 1 leaked to a point where the system controller shut down the engine driven pumps in the #1 engine. Brake System 1 accumulator also had a slow leak which became evident only after the hydraulic pumps were shut off.
Air carrier flight crew reported that they received an alert indicating loss of Hydraulic System 1. A safe landing was made at their destination.