Best Time to Fly BWI to GRR: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → Gerald R. Ford International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 73.8% of Baltimore (BWI) to Grand Rapids (GRR) flights arrived on time (440 scheduled flights). That is 3.8 points below the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (82% on time) and June the worst month (60%).
The cancellation rate was 1.6% (US average 1.8%).
BWI to GRR 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 | 73.8% | 53 min | 1.6% | 440 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to GRR
On-time arrival % by scheduled departure hour (local time), 846 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 88.6% | 0.0% | 35 |
| 9am–10am | Limited data | 22 | |
| 10am–11am | 83.6% | 3.5% | 57 |
| 11am–12pm | 81.8% | 0.0% | 181 |
| 12pm–1pm | 80.5% | 0.0% | 241 |
| 1pm–2pm | 83.8% | 0.0% | 80 |
| 2pm–3pm | 69.0% | 0.0% | 58 |
| 3pm–4pm | Limited data | 9 | |
| 4pm–5pm | Limited data | 8 | |
| 5pm–6pm | Limited data | 3 | |
| 6pm–7pm | Limited data | 1 | |
| 7pm–8pm | Limited data | 25 | |
| 8pm–9pm | 68.8% | 2.9% | 34 |
| 9pm–10pm | Limited data | 25 | |
| 10pm–11pm | 53.1% | 4.5% | 67 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BWI to GRR
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) | 73.3% | -8.8 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 64.0% | -18.1 pts | 2.4% | 205 |
| All other days | 82.1% | — | 0.5% | 597 |
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).