Best Time to Fly BWI to ORD: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
2,689 flights were scheduled from Baltimore (BWI) to Chicago (ORD) in the last 12 months, and 76.0% of those that flew arrived on time, 1.6 points below the US average of 77.6%.
Among 5 airlines, Southwest Airlines led with 89.2% on time and Frontier Airlines was last with 66.9%.
Over 24 months, Saturday was the most reliable day (82% on time) and July the worst month (71%).
The cancellation rate was 2.4% (US average 1.8%).
BWI to ORD 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 | 89.2% | 44 min | 0.0% | 93 |
| Republic Airways | 83.0% | 98 min | 4.8% | 330 |
| Envoy Air | 76.3% | 82 min | 3.3% | 846 |
| United Airlines | 74.8% | 89 min | 1.2% | 1,208 |
| Frontier Airlines | 66.9% | 193 min | 4.3% | 140 |
| Spirit Airlines | Limited data | 18 | ||
| SkyWest Airlines | Limited data | 28 | ||
| American Airlines | Limited data | 26 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to ORD
On-time arrival % by scheduled departure hour (local time), 5,282 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 90.3% | 3.9% | 129 |
| 6am–7am | 91.6% | 1.6% | 1,021 |
| 7am–8am | 84.0% | 1.8% | 224 |
| 8am–9am | 86.5% | 0.0% | 104 |
| 9am–10am | 80.0% | 9.1% | 44 |
| 10am–11am | 91.2% | 0.8% | 839 |
| 11am–12pm | 82.2% | 1.1% | 658 |
| 12pm–1pm | 84.4% | 0.4% | 245 |
| 1pm–2pm | 84.8% | 0.0% | 59 |
| 2pm–3pm | Limited data | 18 | |
| 3pm–4pm | 69.9% | 2.4% | 85 |
| 4pm–5pm | 62.2% | 7.5% | 40 |
| 5pm–6pm | 56.1% | 1.1% | 805 |
| 6pm–7pm | 57.0% | 3.4% | 437 |
| 7pm–8pm | 64.6% | 3.9% | 234 |
| 8pm–9pm | 72.3% | 4.5% | 287 |
| 9pm–10pm | 78.0% | 2.0% | 51 |
| 10pm–11pm | 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 BWI to ORD
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) | 69.0% | -11.0 pts | 5.4% | 92 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.0% | -5.0 pts | 1.1% | 183 |
| Summer peak (Jun 15 - Aug 15) | 72.1% | -7.9 pts | 2.5% | 962 |
| All other days | 80.0% | — | 1.6% | 4,045 |
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).