The fall was reported to park officials around 7:30 a.m., prompting immediate closure of the trail, The Salt Lake Tribune reported.
A 30-year-old man was also injured in the incident, NBC News reported.
The Tribune identified the deceased only as a 65-year-old man and 60-year-old woman.
Arches National Park Chief Ranger Scott Brown told the newspaper all three people are from California and appear to be related.
According to NBC News, first responders found the older man and woman dead at the scene, and injured man was flown to Moab Regional Hospital for treatment.
Park officials reopened the trail, described by the National Park Service as the "world's most famous natural stone arch," around 3 p.m.
The trail up to Delicate Arch has reopened for use. Winter conditions make for slippery hiking; proceed with caution.
— Arches National Park (@ArchesNPS) November 29, 2019
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