Best Time to Fly ATL to BWI: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
5,404 flights were scheduled from Atlanta (ATL) to Baltimore (BWI) in the last 12 months, and 75.6% of those that flew arrived on time, 2.0 points below the US average of 77.6%.
Among 4 airlines, Spirit Airlines led with 81.7% on time and Frontier Airlines was last with 61.0%.
Over 24 months, Wednesday was the most reliable day (83% on time) and July the worst month (60%).
The cancellation rate was 2.1% (US average 1.8%).
ATL 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 |
|---|---|---|---|---|
| Spirit Airlines | 81.7% | 75 min | 1.9% | 107 |
| Delta Air Lines | 78.7% | 58 min | 2.0% | 2,811 |
| Southwest Airlines | 78.1% | 60 min | 1.9% | 1,562 |
| Frontier Airlines | 61.0% | 70 min | 2.7% | 924 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to BWI
On-time arrival % by scheduled departure hour (local time), 11,360 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 85.2% | 0.0% | 101 |
| 6am–7am | 92.6% | 2.0% | 304 |
| 7am–8am | 89.4% | 1.9% | 1,034 |
| 8am–9am | 90.6% | 0.8% | 481 |
| 9am–10am | 83.4% | 1.2% | 740 |
| 10am–11am | 84.8% | 1.8% | 395 |
| 11am–12pm | 85.2% | 1.4% | 899 |
| 12pm–1pm | 77.8% | 0.4% | 235 |
| 1pm–2pm | 79.9% | 1.9% | 849 |
| 2pm–3pm | 73.6% | 2.5% | 653 |
| 3pm–4pm | 71.0% | 1.1% | 717 |
| 4pm–5pm | 66.7% | 2.0% | 882 |
| 5pm–6pm | 69.0% | 3.9% | 590 |
| 6pm–7pm | 66.8% | 1.5% | 791 |
| 7pm–8pm | 66.8% | 2.5% | 515 |
| 8pm–9pm | 66.2% | 1.9% | 475 |
| 9pm–10pm | 59.3% | 2.1% | 386 |
| 10pm–11pm | 63.2% | 2.1% | 1,207 |
| 11pm–12am | 65.0% | 1.9% | 106 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ATL 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) | 77.4% | -1.0 pts | 0.0% | 243 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.0% | -10.4 pts | 2.2% | 460 |
| Summer peak (Jun 15 - Aug 15) | 62.8% | -15.6 pts | 3.9% | 2,034 |
| All other days | 78.4% | — | 1.4% | 8,623 |
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).