Calculate your Illinois per diem.
Enter your travel dates and destination to see your lodging, meals, and incidentals allowance.
Calculate
How to use the per diem calculator
- Enter your travel details: Add your departure and return dates, then select your destination. Add multiple locations if your trip includes more than one destination.
- Understand expense categories: GSA rates cover lodging, meals, and incidental expenses (M&IE). Lodging rates may vary by season, while M&IE rates typically remain consistent.
- Get accurate estimates: The calculator uses the latest GSA rates to estimate your travel allowance.
Result
- Total days
- 0
- Trip total
- $0
- Lodging
- $0
- Meals
- $0
- Incidentals
- $0
You receive 75% of the daily M&IE rate on the first and last day of travel. Rates shown are the GSA maximums for your travel dates.
What is the per diem rate in Illinois?
The standard federal per diem in Illinois is $181 a day for FY2027 ($113 lodging, $68 M&IE), but 4 locations carry higher rates, led by Chicago at up to $238 a night. The rates apply through September 30, 2027.
After Chicago, the highest-rate Illinois locations are East St. Louis / O'Fallon / Fairview Heights (up to $156 a night) and Oakbrook Terrace (up to $123 a night), plus 1 more. Rates follow the county, so a town inside a listed county gets that county's rate. Every other place in Illinois uses the standard $181.
Lodging in one Illinois location changes by season. Chicago peaks at $238 from April 1 to June 30 and drops to $148 from December 1 to March 31.
Use the Illinois per diem calculator to add your dates and get the total for your trip.
Per diem rates in other states
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