diff --git a/.github/workflows/cleanup-e2e-workers.yml b/.github/workflows/cleanup-e2e-workers.yml
index 917de52e997d..610efadef033 100644
--- a/.github/workflows/cleanup-e2e-workers.yml
+++ b/.github/workflows/cleanup-e2e-workers.yml
@@ -20,6 +20,7 @@ jobs:
         worker-prefix:
           - e2e-send-to-sentry
           - e2e-flue-send-to-sentry
+          - e2e-without-tracing-send-to-sentry
     steps:
       - name: Set up Node
         uses: actions/setup-node@v7
diff --git a/dev-packages/e2e-tests/.env.example b/dev-packages/e2e-tests/.env.example
index 3815cae556f0..09b051d0e848 100644
--- a/dev-packages/e2e-tests/.env.example
+++ b/dev-packages/e2e-tests/.env.example
@@ -23,5 +23,7 @@ E2E_OPENAI_DECISIONS_API_KEY=
 # Cloudflare credentials for E2E tests that deploy a real Worker (e.g. cloudflare-workers-send-to-sentry).
 # The API token needs "Workers Scripts: Edit" on the account; "Workers KV Storage: Read" additionally silences a
 # warning when a worker is deleted. Leave it empty to use a `wrangler login` session instead.
+# Apps that read Workers Logs (e.g. cloudflare-workers-without-tracing-send-to-sentry) need an API token with
+# "Workers Observability: Edit".
 CLOUDFLARE_API_TOKEN=
 CLOUDFLARE_ACCOUNT_ID=
diff --git a/dev-packages/e2e-tests/README.md b/dev-packages/e2e-tests/README.md
index 971ba3057c10..f15677f95df9 100644
--- a/dev-packages/e2e-tests/README.md
+++ b/dev-packages/e2e-tests/README.md
@@ -146,6 +146,9 @@ Apps like `cloudflare-workers-send-to-sentry` deploy the built app as a real Wor
   `cloudflare-flue-send-to-sentry/src/auth.ts`.
 - Add the `workerPrefix` to `.github/workflows/cleanup-e2e-workers.yml`, which deletes the Worker of a PR when the PR
   closes.
+- To check what Cloudflare stored for a request (for example its Cloudflare trace id), read Workers Logs with
+  `fetchWorkersLogsEvents`. `CLOUDFLARE_API_TOKEN` then also needs "Workers Observability: Edit". See
+  `cloudflare-workers-without-tracing-send-to-sentry`.
 - Set `"sentryTest": { "optional": true }` in `package.json`, because only the optional CI job has the Cloudflare
   secrets.
 
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/.gitignore b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/.gitignore
new file mode 100644
index 000000000000..b6c344e957e1
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/.gitignore
@@ -0,0 +1,5 @@
+dist
+.wrangler
+node_modules
+test-results
+pnpm-lock.yaml
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/global-setup.ts b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/global-setup.ts
new file mode 100644
index 000000000000..5a3e6215ca04
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/global-setup.ts
@@ -0,0 +1,3 @@
+import { createWorkerGlobalSetup } from '@sentry-internal/test-utils/cloudflare';
+
+export default createWorkerGlobalSetup({ workerPrefix: 'e2e-without-tracing-send-to-sentry' });
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/global-teardown.ts b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/global-teardown.ts
new file mode 100644
index 000000000000..c7bcfe696e66
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/global-teardown.ts
@@ -0,0 +1 @@
+export { workerGlobalTeardown as default } from '@sentry-internal/test-utils/cloudflare';
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/package.json b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/package.json
new file mode 100644
index 000000000000..9dfe01fc5709
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/package.json
@@ -0,0 +1,34 @@
+{
+  "name": "cloudflare-workers-without-tracing-send-to-sentry",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "build": "vite build",
+    "typecheck": "tsc --noEmit && tsc --noEmit -p tsconfig.node.json",
+    "test": "playwright test",
+    "clean": "npx rimraf node_modules pnpm-lock.yaml dist .wrangler",
+    "test:build": "pnpm install && pnpm build",
+    "test:assert": "pnpm typecheck && pnpm test"
+  },
+  "dependencies": {
+    "@sentry/cloudflare": "file:../../packed/sentry-cloudflare-packed.tgz"
+  },
+  "devDependencies": {
+    "@cloudflare/vite-plugin": "^1.47.0",
+    "@cloudflare/workers-types": "^5.20260727.1",
+    "@playwright/test": "1.64.1",
+    "@sentry-internal/test-utils": "file:../../packed/sentry-internal-test-utils-packed.tgz",
+    "@types/node": "^26.1.2",
+    "sentry": "~0.44.1",
+    "typescript": "~6.0.3",
+    "vite": "^8.1.5",
+    "wrangler": "^4.114.0"
+  },
+  "volta": {
+    "extends": "../../package.json"
+  },
+  "sentryTest": {
+    "optional": true
+  }
+}
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/playwright.config.ts b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/playwright.config.ts
new file mode 100644
index 000000000000..9452ae9ac890
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/playwright.config.ts
@@ -0,0 +1,13 @@
+import { getPlaywrightConfig } from '@sentry-internal/test-utils';
+
+const config = getPlaywrightConfig(undefined, {
+  // The tests read what arrived in Sentry through the sentry CLI, so there is no event proxy to start.
+  webServer: undefined,
+  // The worker is deployed once for the whole run and deleted again afterwards.
+  globalSetup: './global-setup.ts',
+  globalTeardown: './global-teardown.ts',
+  // A test polls Workers Logs and then Sentry, each for up to 180s.
+  timeout: 400_000,
+});
+
+export default config;
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/pnpm-workspace.yaml b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/pnpm-workspace.yaml
new file mode 100644
index 000000000000..fd29a82085e0
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/pnpm-workspace.yaml
@@ -0,0 +1,4 @@
+allowBuilds:
+  esbuild: true
+  workerd: true
+minimumReleaseAge: 0
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/src/env.d.ts b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/src/env.d.ts
new file mode 100644
index 000000000000..eb80bafb4834
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/src/env.d.ts
@@ -0,0 +1,3 @@
+interface Env {
+  E2E_TEST_DSN: string;
+}
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/src/index.ts b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/src/index.ts
new file mode 100644
index 000000000000..2f403c3d780f
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/src/index.ts
@@ -0,0 +1,16 @@
+import * as Sentry from '@sentry/cloudflare';
+
+export default {
+  async fetch(request) {
+    switch (new URL(request.url).pathname) {
+      case '/test-error': {
+        const eventId = Sentry.captureException(new Error('E2E test error in a Cloudflare trace'));
+        // Workers Logs store the `cf-ray` of the request with the invocation, so the test finds the Cloudflare trace
+        // with it.
+        return Response.json({ eventId, rayId: request.headers.get('cf-ray') });
+      }
+      default:
+        return new Response('Hello World!');
+    }
+  },
+} satisfies ExportedHandler<Env>;
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/src/instrument.server.ts b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/src/instrument.server.ts
new file mode 100644
index 000000000000..51377aa24309
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/src/instrument.server.ts
@@ -0,0 +1,6 @@
+import { defineCloudflareOptions } from '@sentry/cloudflare';
+
+export default defineCloudflareOptions((env: Env) => ({
+  dsn: env.E2E_TEST_DSN,
+  tracesSampleRate: 0,
+}));
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/tests/send-to-sentry.test.ts b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/tests/send-to-sentry.test.ts
new file mode 100644
index 000000000000..ec0da7fc8ce3
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/tests/send-to-sentry.test.ts
@@ -0,0 +1,36 @@
+import { expect, test } from '@playwright/test';
+import { EVENT_POLLING_OPTIONS, fetchEvent, traceTarget } from '@sentry-internal/test-utils/cli';
+import type { ApiEvent } from '@sentry-internal/test-utils/cli';
+import { fetchFromWorker, fetchWorkersLogsEvents } from '@sentry-internal/test-utils/cloudflare';
+import type { WorkersLogsEvent } from '@sentry-internal/test-utils/cloudflare';
+
+// Set by global-setup.ts once the worker for this run is deployed.
+const workerUrl = process.env.E2E_TEST_WORKER_URL;
+
+test('Sends an error in the Cloudflare trace to Sentry', async () => {
+  const { eventId, rayId }: { eventId: string; rayId: string } = JSON.parse(
+    await fetchFromWorker(`${workerUrl}/test-error`, 200),
+  );
+
+  // The span of the request is the root span of the Cloudflare trace, and the only span with the `cf-ray` of the
+  // request.
+  let cloudflareSpans: WorkersLogsEvent[] = [];
+  await expect
+    .poll(
+      async () =>
+        (cloudflareSpans = await fetchWorkersLogsEvents({ '$metadata.rayId': rayId, '$metadata.type': 'span' })),
+      EVENT_POLLING_OPTIONS,
+    )
+    .toHaveLength(1);
+  const { traceId, spanId } = cloudflareSpans[0]!.$metadata;
+  expect(traceId).toEqual(expect.stringMatching(/^[\da-f]{32}$/));
+  expect(spanId).toEqual(expect.stringMatching(/^[\da-f]{16}$/));
+
+  console.log(`Polling for error eventId ${eventId}: sentry trace view ${traceTarget(traceId!)}`);
+
+  let event: ApiEvent | undefined;
+  await expect.poll(() => (event = fetchEvent(eventId)), EVENT_POLLING_OPTIONS).toBeDefined();
+
+  expect(event?.contexts?.trace?.trace_id).toBe(traceId);
+  expect(event?.contexts?.trace?.parent_span_id).toBe(spanId);
+});
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/tsconfig.json b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/tsconfig.json
new file mode 100644
index 000000000000..94b03468f288
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/tsconfig.json
@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "es2023",
+    "lib": ["es2023"],
+    "module": "es2022",
+    "moduleResolution": "bundler",
+    "types": ["@cloudflare/workers-types", "node"],
+    "skipLibCheck": true,
+    "noEmit": true,
+    "isolatedModules": true,
+    "allowSyntheticDefaultImports": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true
+  },
+  "include": ["src/**/*", "vite.config.ts"]
+}
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/tsconfig.node.json b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/tsconfig.node.json
new file mode 100644
index 000000000000..c49bedb6b3e3
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/tsconfig.node.json
@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "types": ["node"]
+  },
+  "include": ["tests/**/*", "global-setup.ts", "global-teardown.ts", "playwright.config.ts"]
+}
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/vite.config.ts b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/vite.config.ts
new file mode 100644
index 000000000000..005f4448f6cb
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/vite.config.ts
@@ -0,0 +1,7 @@
+import { cloudflare } from '@cloudflare/vite-plugin';
+import { sentryCloudflareVitePlugin } from '@sentry/cloudflare/vite';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+  plugins: [cloudflare(), sentryCloudflareVitePlugin()],
+});
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/wrangler.jsonc b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/wrangler.jsonc
new file mode 100644
index 000000000000..ea985e5a54b7
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-workers-without-tracing-send-to-sentry/wrangler.jsonc
@@ -0,0 +1,11 @@
+{
+  "$schema": "node_modules/wrangler/config-schema.json",
+  // Placeholder only: every test run deploys under a unique name, see global-setup.ts.
+  "name": "cloudflare-workers-without-tracing-send-to-sentry",
+  "main": "src/index.ts",
+  "compatibility_date": "2026-05-20",
+  "compatibility_flags": ["nodejs_compat"],
+  "workers_dev": true,
+  // The tests read the Cloudflare trace of each request from Workers Logs.
+  "observability": { "enabled": true, "traces": { "enabled": true } },
+}
diff --git a/dev-packages/test-utils/src/cli.ts b/dev-packages/test-utils/src/cli.ts
index 7e0d92dded70..212b83dba125 100644
--- a/dev-packages/test-utils/src/cli.ts
+++ b/dev-packages/test-utils/src/cli.ts
@@ -135,6 +135,7 @@ export interface ApiEvent {
     type: string;
     data: { values?: { type?: string; value?: string; mechanism?: { type?: string; handled?: boolean } }[] };
   }[];
+  contexts?: { trace?: { trace_id?: string; span_id?: string; parent_span_id?: string } };
 }
 
 /** Fetch an error event of the E2E test project. Returns `undefined` while the event is not stored yet. */
diff --git a/dev-packages/test-utils/src/cloudflare.ts b/dev-packages/test-utils/src/cloudflare.ts
index f50908f03dc4..7dfd0a3445ce 100644
--- a/dev-packages/test-utils/src/cloudflare.ts
+++ b/dev-packages/test-utils/src/cloudflare.ts
@@ -224,6 +224,62 @@ export function workerGlobalTeardown(config: FullConfig): void {
   }
 }
 
+/** An event of Workers Logs: an invocation, a `console` call, or a span of the Cloudflare trace. */
+export interface WorkersLogsEvent {
+  $metadata: {
+    /** The `cf-ray` header of the request that the event belongs to. */
+    rayId?: string;
+    /** `span` for a span of the Cloudflare trace, `cf-worker-event` for an invocation. */
+    type?: string;
+    traceId?: string;
+    spanId?: string;
+  };
+}
+
+/**
+ * Returns the Workers Logs events of the last hour with the given values, for example
+ * `{ '$metadata.rayId': rayId }`. Returns an empty list while the events are not queryable yet.
+ *
+ * `CLOUDFLARE_API_TOKEN` needs the "Workers Observability: Edit" permission, which the query endpoint
+ * requires also for reads. A `wrangler login` session does not have it.
+ */
+export async function fetchWorkersLogsEvents(values: Record<string, string>): Promise<WorkersLogsEvent[]> {
+  const now = Date.now();
+  const response = await fetch(
+    `https://api.cloudflare.com/client/v4/accounts/${process.env.CLOUDFLARE_ACCOUNT_ID}/workers/observability/telemetry/query`,
+    {
+      method: 'POST',
+      headers: { Authorization: `Bearer ${process.env.CLOUDFLARE_API_TOKEN}`, 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        queryId: 'sentry-e2e-tests',
+        // Runs the query without saving it to the account.
+        dry: true,
+        view: 'events',
+        limit: 100,
+        timeframe: { from: now - 60 * 60 * 1000, to: now },
+        parameters: {
+          filters: Object.entries(values).map(([key, value]) => ({ key, operation: 'eq', type: 'string', value })),
+        },
+      }),
+    },
+  );
+
+  if (response.status === 429) {
+    return [];
+  }
+
+  const body = await response.text();
+
+  if (!response.ok) {
+    throw new Error(
+      `The Workers Logs query failed with status ${response.status}: ${body}. ` +
+        'CLOUDFLARE_API_TOKEN needs the "Workers Observability: Edit" permission.',
+    );
+  }
+
+  return (JSON.parse(body) as { result: { events?: { events?: WorkersLogsEvent[] } } }).result.events?.events ?? [];
+}
+
 /**
  * Sends a request until the Worker itself answers it, and returns the body of that answer.
  *