Chicago (MDW) to Baltimore (BWI): On-Time Performance
Data through July 2026
The calendar drives reliability on MDW–BWI. January 2025 flights landed on schedule 89% of the time, but July 2025 dropped to 64% — a gap of 25 points. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 63%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 1.9%
- Flights/day
- 5.1
- last 12 months
- Duration
- 1h 49m
- scheduled
- Distance
- 611 mi
Best airline from MDW to BWI
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 79% | 13 min | 1.9% | 3,725 |
| Frontier Airlines | 73% | 19 min | 0.8% | 260 |
Monthly on-time trend
Best time to fly from MDW to BWI
Aim for departures around 6 a.m. (96% on-time); avoid 7 p.m. departures (54%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 18 min |
| Tuesday | 84% | 10 min |
| Wednesday | 77% | 14 min |
| Thursday | 80% | 13 min |
| Friday | 79% | 13 min |
| Saturdaybest | 85% | 10 min |
| Sunday | 77% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft47%
- Airline operations30%
- National airspace system19%
- Weather3%
Frequently asked questions
- How often are flights from MDW to BWI delayed?
- 21% of MDW–BWI flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from MDW to BWI?
- Southwest Airlines has the best on-time record on this route at 79%, based on 3,725 flights. 2 airlines flew MDW–BWI frequently enough to compare in this period.
- What is the best time of day to fly from MDW to BWI?
- Departures around 6 a.m. have the best record (96% on-time), while departures around 7 p.m. have the worst (54%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MDW to BWI?
- The scheduled MDW–BWI flight time averages 1h 49m over 611 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are MDW to BWI flights cancelled?
- 1.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from MDW to BWI?
- July 2025 was the roughest month in this dataset, with only 64% of arrivals on time. The best was January 2025 at 89%. If your dates are flexible, that 25-point gap is worth planning around.
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Based on 3,985 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.