If you want to change the display pattern of the price then please add below given code in your child theme functions.php file.

function wp_travel_customize_price_display( $s, $c, $d ) {
  global $wp_travel_itinerary;
  if ( $wp_travel_itinerary->is_sale_enabled() ) {
    return $s;
  }
  return sprintf( esc_html__('Starting from %1s %2s', 'wp-travel' ), $d, $c );
}
add_filter( 'wp_travel_itinerary_price', 'wp_travel_customize_price_display', 99, 3 );


function wp_travel_customize_sale_price_display( $s, $c, $d ) {
  return  sprintf( esc_html__('Starting from %1s %2s', 'wp-travel' ), $d, $c );
}
add_filter( 'wp_travel_itinerary_sale_price', 'wp_travel_customize_sale_price_display', 99, 3 );

Default pattern:

Pattern after adding code.

You can change the text and placement of currency from the code provided above.