Route
MDW → BOS
Chicago Midway International Airport Boston Logan International Airport
How punctual is this route?
- On-time arrivals
- 65.9%
- Less than 15 minutes late
- Cancelled
- 1.3%
- Of scheduled flights
- Average delay when late
- 67 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,368
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 37%
- Late-arriving aircraft 30%
- Airline (crew, maintenance, cleaning) 30%
- Extreme weather 2%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 55.5% | 128 |
| October 2025 | 62.3% | 139 |
| November 2025 | 73.8% | 88 |
| December 2025 | 73.3% | 90 |
| January 2026 | 79.1% | 69 |
| February 2026 | 80.0% | 63 |
| March 2026 | 54.5% | 113 |
| April 2026 | 72.3% | 119 |
| May 2026 | 71.5% | 123 |
| June 2026 | 60.3% | 143 |
| July 2026 | 62.6% | 151 |
| August 2026 | 65.5% | 142 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 1,368 | 65.9% | 1.3% | 67 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3678
19% late · 64 flights
-
WN1773
27% late · 63 flights
-
WN4611
11% late · 61 flights
-
WN4975
68% late · 61 flights
-
WN1280
50% late · 58 flights
-
WN2392
41% late · 58 flights
-
WN987
11% late · 58 flights
-
WN1405
10% late · 52 flights
-
WN3737
10% late · 49 flights
-
WN2657
29% late · 41 flights
-
WN3680
36% late · 40 flights
-
WN1800
15% late · 34 flights
-
WN1740
64% late · 33 flights
-
WN3352
15% late · 33 flights
-
WN3250
27% late · 31 flights
-
WN3544
55% late · 31 flights
-
WN4295
3% late · 30 flights
-
WN2966
59% late · 29 flights
-
WN1930
50% late · 28 flights
-
WN232
71% late · 27 flights
-
WN4716
56% late · 27 flights
-
WN4806
27% late · 25 flights
-
WN164
17% late · 24 flights
-
WN3315
21% late · 24 flights
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