Sort the woocommerce_package_rates from lowest to highest

sort-woocommerce_package_rates.php

<?php
// credit: ChromeOrange - https://gist.github.com/ChromeOrange/10013862
add_filter( 'woocommerce_package_rates' , 'sort_woocommerce_available_shipping_methods', 10, 2 );
function sort_woocommerce_available_shipping_methods( $rates, $package ) {
    //  if there are no rates don't do anything
    if ( ! $rates ) {
        return;
    }

    // get an array of prices
    $prices = array();
    foreach( $rates as $rate ) {
        $prices[] = $rate->cost;
    }

    // use the prices to sort the rates
    array_multisort( $prices, $rates );

    // return the rates
    return $rates;
}
?>