Chicago Midway International in August 2025

73.4%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In August 2025, reporting carriers scheduled 6,731 domestic departures from Chicago Midway International (MDW). 73.4% left less than 15 minutes late and 76.9% reached their destination on time; 0.7% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so MDW departures were 3.4 points below the national departure figure.

A year earlier, in August 2024, the airport had 7,199 departures with 73.5% leaving on time: a change of −0.1 points, with flights down 7%.

Flights arriving at MDW that month were on time 78.2% of the time (6,734 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 44%, air carrier 31% and national aviation system 17%.

On time 76.9%
Arrived 15+ minutes late 21.9%
Cancelled 0.7%
Diverted 0.4%

Every scheduled departure from MDW in August 2025, judged by arrival at the destination.

August 2025 against a year earlier, the airport's year and the nation

Measure	Aug 2025	Aug 2024	MDW, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	73.4%	73.5%	70.7%	76.8%
Arrived on time	76.9%	75.2%	73.9%	76.3%
Cancelled	0.7%	0.8%	1.5%	1.1%
Average departure delay (late minutes only)	16.2 min	15.1 min	16.5 min	17.6 min
Scheduled departures a day	224	240	202	20,079
Scheduled departures	6,731	7,199	73,744	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	6,248	93%	76.6%	7.9 min	0.7%
F9 Frontier Airlines	165	2%	80.6%	0.0 min	1.8%
OO SkyWest Airlines	158	2%	75.3%	8.2 min	1.3%
DL Delta Air Lines	121	2%	86.8%	-3.2 min	0.8%
G4 Allegiant Air	39	1%	76.9%	65.2 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MDW–ATL	Chicago to Atlanta	305	79.7%	2.7 min	1.3%
MDW–MSP	Chicago to Minneapolis	237	73.8%	11.6 min	0.4%
MDW–MCO	Chicago to Orlando	227	69.2%	12.1 min	0.4%
MDW–DEN	Chicago to Denver	226	72.6%	10.0 min	0.4%
MDW–LAS	Chicago to Las Vegas	215	83.3%	4.8 min	0.0%
MDW–PHX	Chicago to Phoenix	213	82.6%	3.3 min	1.4%
MDW–LGA	Chicago to New York	202	73.8%	12.1 min	1.0%
MDW–DAL	Chicago to Dallas	193	78.8%	7.6 min	0.5%
MDW–MCI	Chicago to Kansas City	189	78.8%	8.0 min	0.0%
MDW–BWI	Chicago to Baltimore	184	76.1%	7.0 min	1.6%
MDW–DCA	Chicago to Washington	181	75.1%	6.9 min	0.6%
MDW–BNA	Chicago to Nashville	168	76.8%	6.5 min	0.6%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	31.1%	33.1%	26,694
Late-arriving aircraft	44.3%	40.5%	38,005
National Aviation System	17.0%	19.2%	14,573
Extreme weather	6.8%	7.0%	5,795
Security	0.8%	0.1%	687

85,754 delay minutes on 1,477 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left MDW on time in August 2025?

73.4% of 6,731 scheduled domestic departures left less than 15 minutes late, and 76.9% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 73.5% of 7,199 departures left on time and 0.8% were cancelled, against 73.4% and 0.7% in August 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for MDW · methodology · corrections.