2 comments

1. If you look at canonical.php you will notice that the wp_redirect_admin_locations function is hooked very late– at priority 1000. This means that just about any function hooked to redirect_canonical runs before this one. So, conditionally remove wp_redirect_admin_locations from the template_redirect hook.

   add_action(
     'template_redirect', 
     function() {
       $requ = untrailingslashit($_SERVER['REQUEST_URI']);
       if (site_url('login','relative') === $requ ){
         remove_action( 'template_redirect', 'wp_redirect_admin_locations', 1000 );
       }
     }
   );
   

2. This answer is based on the findings of “login” in permalink redirects to wp-login.php wp3.6

   Disable “/login” redirect

   As already stated there the relevant code is located at the very end in /wp-includes/canonical.php

   You need to remove the default “wp_redirect_admin_locations” and replace it with a slightly modified custom version. Add this to your function.php file.

   function custom_wp_redirect_admin_locations() {
       global $wp_rewrite;
       if ( ! ( is_404() && $wp_rewrite->using_permalinks() ) )
           return;
   
       $admins = array(
           home_url( 'wp-admin', 'relative' ),
           home_url( 'dashboard', 'relative' ),
           home_url( 'admin', 'relative' ),
           site_url( 'dashboard', 'relative' ),
           site_url( 'admin', 'relative' ),
       );
       if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $admins ) ) {
           wp_redirect( admin_url() );
           exit;
       }
   
       $logins = array(
           home_url( 'wp-login.php', 'relative' )
       );
       if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $logins ) ) {
           wp_redirect( site_url( 'wp-login.php', 'login' ) );
           exit;
       }
   }
   
   function remove_default_login_redirect() {
       remove_action('template_redirect', 'wp_redirect_admin_locations', 1000);
       add_action( 'template_redirect', 'custom_wp_redirect_admin_locations', 1000 );
   }
   
   add_action('init','remove_default_login_redirect');
   

   Why this might not even be necessary

   Also you should be aware that the redirect only applies if there is nothing else at /login. As soon as e.g. you create a page /login the redirect doesn’t apply any more. (See /wp-includes/canonical.php:553 for where this happens.

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