How to set laravel 5.3 logout redirect path?

This is how I did it. In Auth\LoginController you have:

use AuthenticatesUsers;

Change it to:

use AuthenticatesUsers {
    logout as performLogout;
}

Then, define a new logout() method in your LoginController:

public function logout(Request $request)
{
    $this->performLogout($request);
    return redirect()->route('your_route');
}

Sure, regular logout() method in that trait has only 3 lines (used to log users out of the system) so you can copy them to your method, but you should always follow the DRY principle (don't repeat yourself) and re-use as much code as you can.

I would inherit LoginController and override the logout function coming from the trait in there:

LoginController.php -> leave that as it is.

MyLoginController.php:

class MyLoginController extends LoginController {

protected $redirectAfterLogout = '/goodbye';

    public function logout(Request $request)
    {
        $this->guard()->logout();
        $request->session()->flush();
        $request->session()->regenerate();
        return redirect($this->redirectAfterLogout);
    }
}

Of course, you should remember to update your Auth routes accordingly.

Laravel > 5.7

The accepted answer is fine, but you can completely bypass touching any of the logout logic by simply overwriting the loggedOut method:

// App\Http\Controllers\Auth\LoginController.php
protected function loggedOut(Request $request) {
    return redirect('/where/ever/you/want/to/go');
}