2024 Per Diem Rates Oregon State University. Approved osu travel per diem rates will be used to check for the reasonableness standard (the allowable gratuity is included in the per diem rate). Partial day per diem rates (on one day trips):

These rates include incidental expenses (e.g., service tips, housekeeping, baggage carriers, porters, etc.). If the traveler arrives 2 hours.