diff --git a/.changelog/20260424154037_ck_20081.md b/.changelog/20260424154037_ck_20081.md
new file mode 100644
index 000000000..dfdba7591
--- /dev/null
+++ b/.changelog/20260424154037_ck_20081.md
@@ -0,0 +1,9 @@
+---
+type: Fix
+scope:
+  - ckeditor5-dev-ci
+closes:
+  - ckeditor/ckeditor5#20081
+---
+
+Fixed `ckeditor5-dev-ci-notify-circle-status` reporting "Build time: Unavailable." in Slack notifications. The CircleCI job API was called with a pipeline number instead of a job number, so the request did not return a valid `started_at` timestamp.
diff --git a/packages/ckeditor5-dev-ci/bin/notify-circle-status.js b/packages/ckeditor5-dev-ci/bin/notify-circle-status.js
index 9a9c9d32b..91eb00420 100755
--- a/packages/ckeditor5-dev-ci/bin/notify-circle-status.js
+++ b/packages/ckeditor5-dev-ci/bin/notify-circle-status.js
@@ -33,6 +33,7 @@ const {
 
 	// Variables that are available by default in Circle environment.
 	CIRCLE_BRANCH,
+	CIRCLE_BUILD_NUM,
 	CIRCLE_PROJECT_REPONAME,
 	CIRCLE_PROJECT_USERNAME,
 	CIRCLE_SHA1,
@@ -126,7 +127,7 @@ async function getJobData() {
 		CIRCLE_PROJECT_USERNAME,
 		CIRCLE_PROJECT_REPONAME,
 		'job',
-		cliArguments[ 'pipeline-id' ]
+		CIRCLE_BUILD_NUM
 	].join( '/' );
 
 	const fetchOptions = {