Reorder Checkout Fields

functions.php

<?php

/* WooCommerce < 3.0.4 */
add_filter('woocommerce_checkout_fields','reorder_fields');
function reorder_fields($fields) {
	$billing_field_order = array(
		'billing_first_name',
		'billing_last_name',
		'billing_address_1',
		'billing_email',
		'billing_phone',
		'billing_country',
		'billing_state',
		'billing_city',
		'billing_district',
		'billing_postcode'
	);
	$shipping_field_order = array(
		'shipping_first_name',
		'shipping_last_name',
		'shipping_address_1',
		'shipping_email',
		'shipping_phone',
		'shipping_country',
		'shipping_state',
		'shipping_city',
		'shipping_district',
		'shipping_postcode'
	);
	$ordered_billing_fields = array();
	$ordered_shipping_fields = array();
	foreach ($billing_field_order as $field) {
		$ordered_billing_fields[$field] = $fields['billing'][$field];
	}
	foreach ($shipping_field_order as $field) {
		$ordered_shipping_fields[$field] = $fields['shipping'][$field];
	}
	$fields['billing'] = $ordered_billing_fields;
	$fields['shipping'] = $ordered_shipping_fields;
	
	return $fields;
}

/* WooCommerce >= 3.0.4 */
add_filter('woocommerce_checkout_fields','reorder_fields');
function reorder_fields($fields) {
	// set priority
	$fields['billing']['billing_country']['priority'] = 120;
	$fields['billing']['billing_state']['priority'] = 130;
	$fields['billing']['billingg_city']['priority'] = 140;
	$fields['billing']['billing_district']['priority'] = 150;
	$fields['shipping']['shipping_country']['priority'] = 120;
	$fields['shipping']['shipping_state']['priority'] = 130;
	$fields['shipping']['shipping_city']['priority'] = 140;
	$fields['shipping']['shipping_district']['priority'] = 150;
	
	return $fields;
}

/* Using plugin ongkos kirim filter */
add_filter('pok_fields_order', 'reorder_fields');
function reorder_fields($fields) {
	$fields['first_name']	= 10;
	$fields['last_name']	= 20;
	$fields['company']	= 30;
	$fields['country']	= 40;
	$fields['state']	= 50;
	$fields['city']		= 60;
	$fields['district']	= 70;
	$fields['address_1']	= 80;
	$fields['address_2']	= 90;
	$fields['postcode']	= 100;
	$fields['phone']	= 110;
	$fields['email']	= 120;
	return $fields;
}

/**
 * === CATATAN! ===
 * Sejak versi WC 3.0.4, urutan fields diatur berdasarkan priority.
 * Plugin Ongkos Kirim v2.0.10 sudah diset priority masing-masing field.
 * Namun sepertinya WooCommerce masih mempunyai bug yang menyebabkan sistem priority ini tidak berjalan dengan semestinya.
 * Bisa dicek di thread berikut: https://wordpress.org/support/topic/reordering-checkout-fields-doesnt-work-anymore-on-3-0-4/
 */

?>

Sesuaikan nama field dan urutan field yang dikehendaki. Dan jangan lupa atur hook priority jika filter tidak bekerja.