Con
Yet another WordPress dev
add_filter( 'woocommerce_variable_sale_price_html', 'con_show_max_variation_price_only', 10, 2 );
add_filter( 'woocommerce_variable_price_html', 'con_show_max_variation_price_only', 10, 2 );
 
function con_show_max_variation_price_only( $price, $product ) {
 
// Main Variation Price
$prices = array( $product->get_variation_price( 'max', true ), $product->get_variation_price( 'min', true ) );

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

$saleprice = $prices[0] !== $prices[1] ? sprintf( __( '%1$s', 'woocommerce' ), wc_price( $prices[0] ) ) : wc_price( $prices[0] );

//Output
if ( $price !== $saleprice ) {
    
    $price = '<span style="display:none;">' . $saleprice . '</span> <ins>' . $price . '</ins>';
    
    }
    
    return $price;

}