Sort shipping methods by cost in WooCommerce 2.1. Add to theme functions.php file

gistfile1.php

/**
 * Sort WooCommerce shipping methods by cost, lowest to highest
 */
add_filter( 'woocommerce_package_rates' , 'sort_woocommerce_available_shipping_methods', 10, 2 );
function sort_woocommerce_available_shipping_methods( $rates, $package ) {
 
	if ( !$rates ) return $rates;
 
	$tmp = Array();
	foreach( $rates as $ma ) {
		$tmp[] = $ma->cost;
	}
 
	array_multisort( $tmp, $rates );
 
	return $rates;

}

Seeing an error with logged in users that have nothing in their cart yet, both on the cart page and when adding to cart. The solution was to always return $rates, so change the first line to:

if ( !$rates ) return $rates;