Here are several options for using "safe travels" in a sentence, each with a slightly different nuance:
- Formal: "I wish you safe travels on your upcoming journey."
- Informal: "Safe travels, and have a great time!"
- More descriptive: "May you have safe travels and a memorable trip."
- Adding context: "Despite the storm warnings, we're hoping for safe travels."
- As a farewell: "Safe travels; we'll see you when you get back."
The best choice will depend on the context and your desired tone.