免费旅游用英语可以说成 "free travel" 或 "comppmentary travel".

其中, "free" 是形容词，意思是 "不用花钱的"，"comppmentary" 也是形容词，意思是 "免费的"。

例句：

"We're offering comppmentary travel to all employees as a thank-you for their hard work this year." (我们为了感谢员工们这一年的辛勤工作，提供免费旅游。)
"The company is offering a free travel package to its top performing employees." (公司正在为表现优秀的员工提供免费旅游套餐。)