https://www.templatemonster.com/category/travel-wordpress-themes/?wpcategcamp=true&gclid=CjwKCAiAk4XUBRB5EiwAHBLUMa4D4JMNSahdRo6gFRN7lR1zRCkRxxsrfcfyJ2b8TtoNJ8ooE35yKBoCr4gQAvD_BwE
https://themeforest.net/tags/travel%20booking
https://colorlib.com/wp/travel-agency-wordpress-themes/
Some sample web design for travel agency