How to reorder billing fields in WooCommerce Checkout template?

Yes its possible using the some change in functions.php file,

Please do the following some change in woocommerce_form_field() function,


There is one below function:

<?php foreach ($checkout->checkout_fields['billing'] as $key => $field) : ?>
<?php woocommerce_form_field( $key, $field, $checkout->get_value( $key ) ); ?>
<?php endforeach; ?>

Please replace with this:

<?php
$mybillingfields=array(
    "billing_first_name",
    "billing_last_name",
    "billing_company",
    "billing_address_1",
    "billing_address_2",
    "billing_city",
    "billing_state",
    "billing_postcode",
    "billing_country",
    "billing_email",
    "billing_phone",
);
foreach ($mybillingfields as $key) : ?>
<?php woocommerce_form_field( $key, $checkout->checkout_fields['billing'][$key], $checkout->get_value( $key ) ); ?>
<?php endforeach; ?>

You can change position of each fields what ever you want.

Enjoy!