diff --git a/atom/browser/api/atom_api_cookies.cc b/atom/browser/api/atom_api_cookies.cc
index ddb6910b509a..d3607fe50259 100644
--- a/atom/browser/api/atom_api_cookies.cc
+++ b/atom/browser/api/atom_api_cookies.cc
@@ -179,6 +179,12 @@ void OnSetCookie(const Cookies::SetCallback& callback, bool success) {
       base::Bind(callback, success ? Cookies::SUCCESS : Cookies::FAILED));
 }
 
+// Flushes cookie store in IO thread.
+void FlushCookieStoreOnIOThread(scoped_refptr<net::URLRequestContextGetter> getter,
+                                const base::Closure& callback) {
+  GetCookieStore(getter)->FlushStore(base::Bind(RunCallbackInUI, callback));
+}
+
 // Sets cookie with |details| in IO thread.
 void SetCookieOnIO(scoped_refptr<net::URLRequestContextGetter> getter,
                    std::unique_ptr<base::DictionaryValue> details,
@@ -265,6 +271,13 @@ void Cookies::Set(const base::DictionaryValue& details,
       base::Bind(SetCookieOnIO, getter, Passed(&copied), callback));
 }
 
+void Cookies::FlushStore(const base::Closure& callback) {
+  auto getter = make_scoped_refptr(request_context_getter_);
+  content::BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(FlushCookieStoreOnIOThread, getter, callback));
+}
+
 void Cookies::OnCookieChanged(const net::CanonicalCookie& cookie,
                               bool removed,
                               net::CookieStore::ChangeCause cause) {
@@ -286,7 +299,8 @@ void Cookies::BuildPrototype(v8::Isolate* isolate,
   mate::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
       .SetMethod("get", &Cookies::Get)
       .SetMethod("remove", &Cookies::Remove)
-      .SetMethod("set", &Cookies::Set);
+      .SetMethod("set", &Cookies::Set)
+      .SetMethod("flushStore", &Cookies::FlushStore);
 }
 
 }  // namespace api
diff --git a/atom/browser/api/atom_api_cookies.h b/atom/browser/api/atom_api_cookies.h
index 3a7a98fbafd9..d20dab8394c6 100644
--- a/atom/browser/api/atom_api_cookies.h
+++ b/atom/browser/api/atom_api_cookies.h
@@ -53,6 +53,7 @@ class Cookies : public mate::TrackableObject<Cookies>,
   void Remove(const GURL& url, const std::string& name,
               const base::Closure& callback);
   void Set(const base::DictionaryValue& details, const SetCallback& callback);
+  void FlushStore(const base::Closure& callback);
 
   // AtomCookieDelegate::Observer:
   void OnCookieChanged(const net::CanonicalCookie& cookie,
diff --git a/docs/api/cookies.md b/docs/api/cookies.md
index 8e6420296733..060034a16c1f 100644
--- a/docs/api/cookies.md
+++ b/docs/api/cookies.md
@@ -104,3 +104,7 @@ on complete.
 
 Removes the cookies matching `url` and `name`, `callback` will called with
 `callback()` on complete.
+
+#### `cookies.flushStore()`
+
+Writes any unwritten cookies data to disk.