The Swiss Airlines flight modification policy allows you to adjust your itinerary for any reason. In order to modify your flight, you must comply with the terms and conditions. There is just one requirement: your request for a flight change must be sent within 24 hours of the ticket being booked in order to avoid additional fees. However, if your tickets are refundable, you can change your travel itinerary at any time prior to departure without incurring any airline fees. https://flightcancellationpolicy.com/swiss-airlines-flight-change-policy