Best Time to Fly ORD to BWI: On-Time Stats by Hour & Airline
Chicago O'Hare International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 72.5% of Chicago (ORD) to Baltimore (BWI) flights arrived on time (2,691 scheduled flights). That is 5.1 points below the national average of 77.6%.
Envoy Air was the most punctual of the 5 airlines on the route at 77.9%, while Frontier Airlines trailed at 66.4%.
February has been the best month (83% on time) and Friday the weakest day of the week (71%).
2.6% of flights were cancelled, versus 1.8% nationally.
ORD 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 |
|---|---|---|---|---|
| Envoy Air | 77.9% | 62 min | 3.3% | 845 |
| Southwest Airlines | 71.0% | 92 min | 0.0% | 93 |
| United Airlines | 70.5% | 64 min | 1.4% | 1,211 |
| Republic Airways | 69.8% | 83 min | 5.7% | 331 |
| Frontier Airlines | 66.4% | 83 min | 4.3% | 140 |
| Spirit Airlines | Limited data | 18 | ||
| SkyWest Airlines | Limited data | 27 | ||
| American Airlines | Limited data | 26 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to BWI
On-time arrival % by scheduled departure hour (local time), 5,276 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 2 | |
| 5am–6am | 83.3% | 9.4% | 53 |
| 6am–7am | 92.1% | 0.9% | 216 |
| 7am–8am | 89.6% | 0.5% | 579 |
| 8am–9am | 84.8% | 1.5% | 461 |
| 9am–10am | 74.1% | 0.0% | 58 |
| 10am–11am | 85.9% | 0.3% | 362 |
| 11am–12pm | 80.8% | 1.1% | 369 |
| 12pm–1pm | 81.0% | 1.0% | 96 |
| 1pm–2pm | 65.2% | 2.2% | 365 |
| 2pm–3pm | 69.8% | 1.3% | 633 |
| 3pm–4pm | 74.2% | 5.9% | 136 |
| 4pm–5pm | 72.1% | 3.8% | 340 |
| 5pm–6pm | 77.3% | 0.0% | 88 |
| 6pm–7pm | 64.2% | 2.1% | 884 |
| 7pm–8pm | 60.5% | 3.7% | 135 |
| 8pm–9pm | 70.8% | 4.0% | 328 |
| 9pm–10pm | 62.3% | 2.3% | 171 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD 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) | 55.8% | -21.4 pts | 7.5% | 93 |
| Christmas & New Year (Dec 20 - Jan 3) | 71.3% | -6.0 pts | 1.1% | 183 |
| Summer peak (Jun 15 - Aug 15) | 69.3% | -8.0 pts | 2.5% | 968 |
| All other days | 77.2% | — | 1.7% | 4,032 |
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).