The closest airport is Cody, Wyoming but many people fly into Billings, MT as it is cheaper. If you are flying to the wedding, feel free to put your information in this spreadsheet in case any of you would like to coordinate: https://docs.google.com/spreadsheets/d/1N4DR-zBv8TXJF5L_zN4sOt-hiEjbL63gVpNvq5V8PjI/edit?usp=sharing