Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Troubleshooting
Aircraft Equipment Problem Critical
Flight Crew Landed As Precaution; Flight Crew Overcame Equipment Problem
Aircraft
At cruise B System Engine Hydraulic Pump Low Pressure light illuminated. We ran QRH. Approximately 30 minutes later; the B hydraulic fluid started to decrease; and then the B System Electric Hydraulic Pump Low Pressure light illuminated. We ran the QRH then ran Loss of System B. Shortly after B hydraulic quantity went to zero. After loss of B System we [advised ATC]; planning on landing at ZZZ. Approximately 30 minutes later the A System Engine Hydraulic Pump Low Pressure light illuminated. We ran the QRH  again. So now all that is operating is the A System electric hydraulic pump. A hydraulic quantity decreased to 74 percent from approximately 90 percent; so as a precaution we reviewed the 'Manual Reversion or Loss of System A and System B.' We flew a long final to altitude; extended the flaps and put the gear out early in case of Loss of System A. The A hydraulic quantity remained stable and we landed Runway XX; flaps 15 and taxied clear of the runway. We left the flaps at 15 and taxied to the charter pad.
[Report narrative contained no additional information.]
B737 flight crew reported the loss of multiple hydraulic systems.