Route Reliability
Chicago → GRB
ORD–GRB · 173 miles · Chicago O'Hare International Airport to GRB Airport
- 69%
- Arrive within 15 minutes
- 20 min
- Average arrival delay
- 3.5%
- Cancelled
- 3,685
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.American Airlines74%1,386 flights
- 2.United Airlines66%2,299 flights
What the data says
Morning-you made the right choice.
ORD–GRB flights departing between 6–9 AM arrived on time 79% of the time, versus 61% between 3–6 PM.
Sunday scaries are real for this one.
ORD–GRB flights arrived on time 72% of the time on Tuesdays. On Sundays: 65%.
American Airlines runs this route best.
American Airlines arrived on time 74% of the time on this route; United Airlines managed 66%.
Keep a backup plan handy.
This route was cancelled 3.5% of the time. Typical for U.S. flights is around 1–2%.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon69%(509 flights)
- Tue72%(488 flights)
- Wed70%(490 flights)
- Thu68%(521 flights)
- Fri66%(521 flights)
- Sat72%(493 flights)
- Sun65%(528 flights)
- 6–9 AM79%(639 flights)
- 9 AM–12 PM75%(333 flights)
- 12–3 PM69%(733 flights)
- 3–6 PM61%(801 flights)
- 6–9 PM65%(671 flights)
- 9 PM–12 AM68%(373 flights)
Jun 71% → May 70% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 71% | 287 |
| July 2025 | 62% | 290 |
| August 2025 | 74% | 283 |
| September 2025 | 82% | 289 |
| October 2025 | 82% | 328 |
| November 2025 | 72% | 295 |
| December 2025 | 52% | 279 |
| January 2026 | 56% | 267 |
| February 2026 | 71% | 265 |
| March 2026 | 66% | 282 |
| April 2026 | 67% | 338 |
| May 2026 | 70% | 347 |
Keep nerding
Based on 3,685 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.