Klaviyo: Flow Sending Delays
Klaviyo's status page listed this on 18 Oct 2026. Lasted 4.8 h, filed against Email Sending, Text Message Sending, WhatsApp Sending, Mobile Push Sending, Flow Editor and Processing. This is their record, not a measurement of ours.
What happened
Started
Resolved
Lasted4.8 h
What failedEmail Sending, Text Message Sending, WhatsApp Sending, Mobile Push Sending, Flow Editor and Processing
Their impactMajor
Regions: their page does not say which. Ours checks from three cities, and the screen we saw is on our own incident pages, where there is one.
What Klaviyo said
On their page: Flow Sending Delays
Klaviyo's status page: “We are continuing to work on resolving the delays affecting flow processing. Some customers may continue to experience delays in their flows while we work through this. Immediate sends remain unaffected, and delayed messages remain queued while we work to process them. We will share another update shortly.”Identified
Klaviyo's status page: “Flow processing has resumed and the delayed backlog is actively clearing. This incident affected all flow processing - including flow-triggered email, SMS, WhatsApp and push messages, as well as flow updates to profiles and lists. Some customers may continue to see delays until the backlog fully catches up. Immediate sends were not affected. We continue to monitor closely and appreciate your patience throughout this incident.”Monitoring
Klaviyo's status page: “Delays have now largely cleared, though some customers may still see flow messages send later than expected. We continue to monitor closely and appreciate your patience throughout this incident.”Monitoring
Klaviyo's status page: “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.”Resolved
What our own check saw
Nothing of ours failed that day, which is worth knowing: their incident did not reach the parts we check, or we were not checking Klaviyo yet.
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