Will I Be Able To Travel On The Day That My United States Passport Expires?
Answer: Your passport is valid up until midnight of the date it expires. So, pertaining to your question, you can travel on the date your US passport expires.
However, many countries abroad will require your passport to have a certain amount of validation on it after you leave that particular country. Some foreign countries will require 6 months validation period after your stay in their country, and some will require 3 months. Some countries might not require any validation period whatsoever. The validation period will vary from country to country. A recommendation for travelers is to be aware of these validation requirements prior to traveling to a particular country.
You can renew your passport before your trip to avoid any issues. You can renew your passport by mail as an adult if you had the passport when you were at least 16 years old. Also, you can mail it in if it is not considerably damaged and if you had it within the last 15 years. If you were under 15, you must appear in person at a passport application acceptance facility to renew your passport. Regular passport processing takes around 4-6 weeks, and expedited passport services will take around 2-3 weeks. You can also appear at a regional passport agency to receive your passport in less time.
The following link will provide more information on renewing your passport by mail.