Illinois Per Diem Rates (FY2026)
Illinois has 4 GSA non-standard per diem areas for FY2026. Everywhere else uses the standard $178/day rate ($110 lodging + $68 M&IE). The most expensive is Chicago — up to $234/night lodging in April plus $92/day M&IE.
| Area | M&IE / day | Lodging / night | Peak month |
|---|---|---|---|
| Bolingbrook / Romeoville / LemontWill | $74 | $114 | flat |
| ChicagoCook / Lake | $92 | $142–$234 | Apr |
| East St. Louis / O'Fallon / Fairview HeightsSt. Clair | $86 | $150 | flat |
| Oak Brook TerraceDuPage | $80 | $115 | flat |
| All other Illinois locationsstandard rate | $68 | $110 | flat |
Estimated trip cost
A 4-night business trip to Chicago — Illinois's most expensive per diem area — in April totals $1,350: $936 lodging (4 nights) + $414 M&IE (5 days, first & last day at 75%). Chicago month-by-month rates →
Book within the Illinois lodging cap
Otto finds hotels at or under the GSA lodging cap for your Illinois destination — $110/night at the standard rate, higher in the 4 listed areas — and books them for you.
Illinois per diem FAQ
- What is the per diem rate in Illinois?
- Illinois has 4 GSA non-standard per diem areas with their own rates for FY2026. Everywhere else in Illinois uses the standard CONUS rate of $178 per day: $110 for lodging plus $68 for meals & incidental expenses (M&IE).
- What is the meal reimbursement (M&IE) rate in Illinois?
- Meal reimbursement in Illinois ranges from $68 to $92 per day for FY2026, depending on the area. The first and last day of travel reimburse at 75% of the daily M&IE rate.