Best Time to Fly GRR to MDW: On-Time Stats by Hour & Airline
Gerald R. Ford International → Chicago Midway International
Data through July 2026 · Last updated October 18, 2026
931 flights were scheduled from Grand Rapids (GRR) to Chicago (MDW) in the last 12 months, and 77.8% of those that flew arrived on time, in line with the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Thursday was the most reliable day (81% on time) and June the worst month (73%).
The cancellation rate was 0.4% (US average 1.8%).
GRR to MDW on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 77.8% | 45 min | 0.4% | 931 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly GRR to MDW
On-time arrival % by scheduled departure hour (local time), 1,785 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 87.4% | 0.7% | 435 |
| 7am–8am | 89.6% | 0.0% | 259 |
| 8am–9am | Limited data | 18 | |
| 9am–10am | Limited data | 18 | |
| 11am–12pm | Limited data | 2 | |
| 12pm–1pm | 86.7% | 0.0% | 212 |
| 1pm–2pm | 83.8% | 0.0% | 81 |
| 2pm–3pm | Limited data | 29 | |
| 3pm–4pm | Limited data | 9 | |
| 4pm–5pm | 74.4% | 0.0% | 125 |
| 5pm–6pm | 75.1% | 0.0% | 230 |
| 6pm–7pm | 63.0% | 0.0% | 166 |
| 7pm–8pm | 73.3% | 0.5% | 196 |
| 8pm–9pm | Limited data | 5 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on GRR to MDW
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 63.3% | -18.7 pts | 3.2% | 31 |
| Christmas & New Year (Dec 20 - Jan 3) | 72.1% | -9.9 pts | 0.0% | 62 |
| Summer peak (Jun 15 - Aug 15) | 76.0% | -6.0 pts | 0.0% | 356 |
| All other days | 82.0% | — | 0.2% | 1,336 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).