diff --git a/.changeset/dry-mirrors-shout.md b/.changeset/dry-mirrors-shout.md
new file mode 100644
index 000000000000..9aa59e115c6f
--- /dev/null
+++ b/.changeset/dry-mirrors-shout.md
@@ -0,0 +1,6 @@
+---
+"@sveltejs/adapter-cloudflare-workers": patch
+"@sveltejs/adapter-cloudflare": patch
+---
+
+fix: correctly return static assets if base path is set
diff --git a/packages/adapter-cloudflare-workers/files/entry.js b/packages/adapter-cloudflare-workers/files/entry.js
index 5e2a6bdc14d0..c63b6482ad83 100644
--- a/packages/adapter-cloudflare-workers/files/entry.js
+++ b/packages/adapter-cloudflare-workers/files/entry.js
@@ -1,5 +1,5 @@
 import { Server } from 'SERVER';
-import { manifest, prerendered } from 'MANIFEST';
+import { manifest, prerendered, base_path } from 'MANIFEST';
 import { getAssetFromKV, mapRequestToAsset } from '@cloudflare/kv-asset-handler';
 import static_asset_manifest_json from '__STATIC_CONTENT_MANIFEST';
 const static_asset_manifest = JSON.parse(static_asset_manifest_json);
@@ -54,7 +54,7 @@ export default {
 
 		// prerendered pages and /static files
 		let is_static_asset = false;
-		const filename = stripped_pathname.substring(1);
+		const filename = stripped_pathname.slice(base_path.length + 1);
 		if (filename) {
 			is_static_asset =
 				manifest.assets.has(filename) || manifest.assets.has(filename + '/index.html');
diff --git a/packages/adapter-cloudflare-workers/index.js b/packages/adapter-cloudflare-workers/index.js
index 40962940bea3..5811f1d91a4f 100644
--- a/packages/adapter-cloudflare-workers/index.js
+++ b/packages/adapter-cloudflare-workers/index.js
@@ -73,9 +73,9 @@ export default function ({ config = 'wrangler.toml' } = {}) {
 
 			writeFileSync(
 				`${tmp}/manifest.js`,
-				`export const manifest = ${builder.generateManifest({
-					relativePath
-				})};\n\nexport const prerendered = new Map(${JSON.stringify(prerendered_entries)});\n`
+				`export const manifest = ${builder.generateManifest({ relativePath })};\n\n` +
+					`export const prerendered = new Map(${JSON.stringify(prerendered_entries)});\n\n` +
+					`export const base_path = ${JSON.stringify(builder.config.kit.paths.base)};\n`
 			);
 
 			const external = ['__STATIC_CONTENT_MANIFEST', 'cloudflare:*'];
diff --git a/packages/adapter-cloudflare-workers/placeholders.d.ts b/packages/adapter-cloudflare-workers/placeholders.d.ts
index 78ceb0e62887..3877ad52f4a5 100644
--- a/packages/adapter-cloudflare-workers/placeholders.d.ts
+++ b/packages/adapter-cloudflare-workers/placeholders.d.ts
@@ -7,6 +7,7 @@ declare module 'MANIFEST' {
 
 	export const manifest: SSRManifest;
 	export const prerendered: Map<string, { file: string }>;
+	export const base_path: string;
 }
 
 declare module '__STATIC_CONTENT_MANIFEST' {
diff --git a/packages/adapter-cloudflare/index.js b/packages/adapter-cloudflare/index.js
index 30603c50030e..7d489ea4296d 100644
--- a/packages/adapter-cloudflare/index.js
+++ b/packages/adapter-cloudflare/index.js
@@ -52,7 +52,7 @@ export default function (options = {}) {
 				`${tmp}/manifest.js`,
 				`export const manifest = ${builder.generateManifest({ relativePath })};\n\n` +
 					`export const prerendered = new Set(${JSON.stringify(builder.prerendered.paths)});\n\n` +
-					`export const app_path = ${JSON.stringify(builder.getAppPath())};\n`
+					`export const base_path = ${JSON.stringify(builder.config.kit.paths.base)};\n`
 			);
 
 			writeFileSync(
@@ -193,7 +193,7 @@ function get_routes_json(builder, assets, { include = ['/*'], exclude = ['<all>'
 								file === '_redirects'
 							)
 					)
-					.map((file) => `/${file}`);
+					.map((file) => `${builder.config.kit.paths.base}/${file}`);
 			}
 
 			if (rule === '<prerendered>') {
diff --git a/packages/adapter-cloudflare/placeholders.d.ts b/packages/adapter-cloudflare/placeholders.d.ts
index 9e0d2fd33dcd..6c79569f7f7f 100644
--- a/packages/adapter-cloudflare/placeholders.d.ts
+++ b/packages/adapter-cloudflare/placeholders.d.ts
@@ -8,4 +8,5 @@ declare module 'MANIFEST' {
 	export const manifest: SSRManifest;
 	export const prerendered: Set<string>;
 	export const app_path: string;
+	export const base_path: string;
 }
diff --git a/packages/adapter-cloudflare/src/worker.js b/packages/adapter-cloudflare/src/worker.js
index a1cef121090a..978c61a08ab8 100644
--- a/packages/adapter-cloudflare/src/worker.js
+++ b/packages/adapter-cloudflare/src/worker.js
@@ -1,11 +1,13 @@
 import { Server } from 'SERVER';
-import { manifest, prerendered, app_path } from 'MANIFEST';
+import { manifest, prerendered, base_path } from 'MANIFEST';
 import * as Cache from 'worktop/cfw.cache';
 
 const server = new Server(manifest);
 
-const immutable = `/${app_path}/immutable/`;
-const version_file = `/${app_path}/version.json`;
+const app_path = `/${manifest.appPath}`;
+
+const immutable = `${app_path}/immutable/`;
+const version_file = `${app_path}/version.json`;
 
 /** @type {import('worktop/cfw').Module.Worker<{ ASSETS: import('worktop/cfw.durable').Durable.Object }>} */
 const worker = {
@@ -28,7 +30,7 @@ const worker = {
 
 		// prerendered pages and /static files
 		let is_static_asset = false;
-		const filename = stripped_pathname.substring(1);
+		const filename = stripped_pathname.slice(base_path.length + 1);
 		if (filename) {
 			is_static_asset =
 				manifest.assets.has(filename) || manifest.assets.has(filename + '/index.html');