functions.php

/**
 * This code should be added to functions.php of your theme
 **/
add_filter('woocommerce_variable_price_html', 'custom_variation_price', 10, 2);

function custom_variation_price( $price, $product ) {
     
     $price = '';

     if ( !$product->min_variation_price || $product->min_variation_price !== $product->max_variation_price ) $price .= '<span class="from">' . _x('From', 'min_price', 'woocommerce') . ' </span>';
			
     $price .= woocommerce_price($product->get_price());
			
     if ( $product->max_variation_price && $product->max_variation_price !== $product->min_variation_price ) {
          $price .= '<span class="to"> ' . _x('to', 'max_price', 'woocommerce') . ' </span>';

          $price .= woocommerce_price($product->max_variation_price);
     }

     return $price;
}