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add_filter( 'woocommerce_variable_price_html', 'djr_price_filter', 10, 2 );
add_filter( 'woocommerce_variable_sale_price_html', 'djr_price_filter', 10, 2 );
/**
 * Filters woocommerce_variable_price_html and woocommerce_variable_sale_price_html to apply text
 * of Starting from instead of the price range from - to that is the woocommerce default
 *
 * @param $price
 * @param $product
 *
 * @return string
 */
function djr_price_filter( $price, $product) {

	// Main price
	$prices = array( $product->get_variation_price( 'min', true ), $product->get_variation_price( 'max', true ) );
	$price = $prices[0] !== $prices[1] ? sprintf( _x( 'Starting from %1$s', 'Price range: from', 'woocommerce' ), wc_price( $prices[0] ) ) : wc_price( $prices[0] );

	// Sale
	$prices = array( $product->get_variation_regular_price( 'min', true ), $product->get_variation_regular_price( 'max', true ) );
	sort( $prices );
	$saleprice = $prices[0] !== $prices[1] ? sprintf( _x( 'Starting from %1$s', 'Price range: from', 'woocommerce' ), wc_price( $prices[0] ) ) : wc_price( $prices[0] );

	if ( $price !== $saleprice ) {
		$price = $product->get_price_html_from_to( $saleprice, $price ) . $product->get_price_suffix();
	} else {
		$price = $price . $product->get_price_suffix();
	}

	return $price;
}