Outage report · Partial outage

Klaviyo outage on Oct 17, 2026

Flow Sending Delays

SeverityPartial outage
StartedOct 17, 2026, 17:01UTC
ResolvedOct 17, 2026, 21:51UTC
Duration4h 49m

What happened

Klaviyo reported a partial outage starting Oct 17, 2026, 17:01 UTC, affecting Email Sending, Text Message Sending, WhatsApp Sending, Mobile Push Sending, Flow Editor, Processing. It was marked resolved at Oct 17, 2026, 21:51 UTC.

  • The incident lasted 4h 49m from first report to resolution.
  • Klaviyo had reported 3 other partial or major outages in the 90 days before it.

Latest update from Klaviyo

Flow processing has returned to normal, and delayed flow actions - including email, SMS, and push messages, as well as profile and list updates - have fully caught up. Immediate sends were not affected. We apologize for the disruption this caused. This incident has been resolved.

Read Klaviyo's official incident report ↗

What our independent monitoring saw

Our independent monitoring of Klaviyo started after this incident, so this report is based on Klaviyo's status page.

Klaviyo's overall reliability

62.2/100

Klaviyo has a reliability score of 62.2/100, with 99.26% effective uptime and 13 incidents over the last 90 days.

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