Deleting schedules can be done using the schedules api. 
curl -XDELETE \
    -H 'Authorization: Bearer XXX' \
    'https://qstash.upstash.io/v2/schedules/<schedule_id>'
Deleting a schedule does not stop existing messages from being delivered. It only stops the schedule from creating new messages.

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Schedule ID

If you don’t know the schedule ID, you can get a list of all of your schedules from here. 
curl \
    -H 'Authorization: Bearer XXX' \
    'https://qstash.upstash.io/v2/schedules'