How to Change and upgrade my Swiss Air flight? Want to know, How to Change and upgrade my Swiss Air flight? You can contact the Swiss Air customer service assistant contact number: OTA at: +1 888 915 2449 or +1-877-359-7947. Swiss Airways provides 24*7 support,and assistance any time for 365 days. Stay on the line until connected to a customer service representative. Source Url: https://flyavionic.com/blog/how-to-change-and-upgrade-my-swiss-air-flight/