Skip cart page go straight to checkout page

1. First uncheck the cart options in WooCommerce Settings > Products.
2. Then add the following in your functions.php:

add_filter('woocommerce_add_to_cart_redirect', 'themeprefix_add_to_cart_redirect');
function themeprefix_add_to_cart_redirect() {
 global $woocommerce;
 $checkout_url = wc_get_checkout_url();
 return $checkout_url;
}

Source: https://wpbeaches.com/skip-cart-go-straight-to-checkout-page-in-woocommerce/