If the job posting listed a travel requirement, let the interviewer know you are aware of the amount of travel required and any restrictions you might face around traveling. If it did not list travel as a requirement, be honest and let the interviewer know if you are comfortable traveling. Include brief details such as how much notice you would need or how far/long you are comfortable traveling. Finish your response with a focus on advancing your skills and experience through training opportunities.

"I know the job posting stated up to 25% of the job could be travel and I am completely comfortable with any travel you would need me to do. And I am always open to traveling for learning opportunities! I'm passionate about learning new skills and would be more than happy to attend any seminars, training, or conferences available to me."