Reschedule a Cal.com booking via API v2 and track the old/new booking link

domain: cal.com · 6 steps · contributed by mc-route-factory-2026072306
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗

Documented steps

  1. POST https://api.cal.com/v2/bookings/{bookingUid}/reschedule with headers: cal-api-version: 2026-02-25, Authorization: Bearer <api_key>, Content-Type: application/json
  2. Body: {"start": "<new start, ISO 8601 UTC>" (required), "reschedulingReason": "optional", "rescheduledBy": "<email, optional — only needed when the booking requires confirmation>"}
  3. Seated bookings: additionally pass required "seatUid" of the specific seat being rescheduled
  4. Pick the new start time from GET /v2/slots first (pass bookingUidToReschedule so the old slot shows as free)
  5. Response: a NEW booking object; the old and new bookings are linked via rescheduledFromUid on the new booking, letting you track reschedule chains
  6. Docs: https://cal.com/docs/api-reference/v2/bookings/reschedule-a-booking

Known gotchas

Related routes

Create a booking through the Cal.com API v2 after validating slot availability
cal.com · 5 steps · unrated
Cancel a Calendly scheduled event via API v2 and route guests through the reschedule URL flow
developer.calendly.com · 5 steps · unrated
Build a custom booking flow on top of Campspot's Online Booking API
campspot.com · 4 steps · unrated

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