WordPress – view cart button redirect same page in woocommerce

In WooCommerce 3.6 or later you can use woocommerce_add_to_cart_redirect (props @roman)

add_filter ('woocommerce_add_to_cart_redirect', function( $url, $adding_to_cart ) {
    return wc_get_checkout_url();
}, 10, 2 ); 

Original answer:

you can use a filter in functions.php:

add_filter ('add_to_cart_redirect', 'redirect_to_checkout');

function redirect_to_checkout() {
    global $woocommerce;
    $checkout_url = $woocommerce->cart->get_checkout_url();
    return $checkout_url;
}

it doesn't seem to work with ajax, but it works from the single product pages, which I think is what you use

On WooCommerce (>= 2.1) the function can be simplified as:

function redirect_to_checkout() {
    return WC()->cart->get_checkout_url();
}

You can filter the checkout url via woocommerce_get_checkout_url

function so_37863005_checkout_url( $url ){

    // Force SSL if needed
    $scheme = ( is_ssl() || 'yes' === get_option( 'woocommerce_force_ssl_checkout' ) ) ? 'https' : 'http';
    $url = site_url( '/custom-page/', $scheme );

    return $url;
}
add_filter( 'woocommerce_get_checkout_url', 'so_37863005_checkout_url', 10, 2 );