Best Time to Fly GRR to BWI: On-Time Stats by Hour & Airline
Gerald R. Ford International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
440 flights were scheduled from Grand Rapids (GRR) to Baltimore (BWI) in the last 12 months, and 81.0% of those that flew arrived on time, 3.3 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Saturday was the most reliable day (92% on time) and August the worst month (72%).
The cancellation rate was 0.9% (US average 1.8%).
GRR to BWI 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 | 81.0% | 57 min | 0.9% | 440 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly GRR to BWI
On-time arrival % by scheduled departure hour (local time), 845 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.7% | 0.9% | 114 |
| 6am–7am | Limited data | 1 | |
| 8am–9am | 91.7% | 0.0% | 60 |
| 10am–11am | Limited data | 6 | |
| 11am–12pm | Limited data | 24 | |
| 12pm–1pm | 89.1% | 0.0% | 101 |
| 1pm–2pm | 75.8% | 1.6% | 123 |
| 2pm–3pm | 73.3% | 0.0% | 88 |
| 3pm–4pm | 75.2% | 0.0% | 208 |
| 4pm–5pm | 66.7% | 1.9% | 52 |
| 5pm–6pm | 67.7% | 4.5% | 66 |
| 6pm–7pm | Limited data | 2 | |
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 BWI
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) | Limited data | 14 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 80.0% | -0.7 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 79.3% | -1.4 pts | 2.4% | 205 |
| All other days | 80.7% | — | 0.3% | 596 |
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).