Chicago Midway International in September 2024

83.0%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 September 2024, reporting carriers scheduled 6,849 domestic departures from Chicago Midway International (MDW). 83.0% left less than 15 minutes late and 84.7% reached their destination on time; 0.3% were cancelled.

Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so MDW departures were 1.4 points below the national departure figure.

A year earlier, in September 2023, the airport had 7,109 departures with 76.1% leaving on time: a change of +6.9 points, with flights down 4%.

Flights arriving at MDW that month were on time 87.4% of the time (6,848 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 44%, late-arriving aircraft 34% and national aviation system 20%.

On time 84.7%
Arrived 15+ minutes late 14.8%
Cancelled 0.3%
Diverted 0.2%

Every scheduled departure from MDW in September 2024, judged by arrival at the destination.

September 2024 against a year earlier, the airport's year and the nation

Measure	Sep 2024	Sep 2023	MDW, 12 months to Jul 2026	All reported flights, Sep 2024
Departed on time	83.0%	76.1%	70.7%	84.4%
Arrived on time	84.7%	75.6%	73.9%	83.9%
Cancelled	0.3%	0.6%	1.5%	0.6%
Average departure delay (late minutes only)	8.5 min	13.0 min	16.5 min	10.6 min
Scheduled departures a day	228	237	202	19,421
Scheduled departures	6,849	7,109	73,744	582,622

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	6,208	91%	84.9%	-1.0 min	0.2%
F9 Frontier Airlines	311	5%	75.2%	6.5 min	1.6%
OO SkyWest Airlines	162	2%	91.4%	-2.7 min	0.0%
DL Delta Air Lines	141	2%	90.1%	-1.1 min	0.0%
G4 Allegiant Air	27	0%	74.1%	6.5 min	7.4%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MDW–ATL	Chicago to Atlanta	329	86.0%	0.0 min	0.3%
MDW–DEN	Chicago to Denver	265	91.3%	-9.4 min	0.4%
MDW–PHX	Chicago to Phoenix	255	82.4%	-1.0 min	0.4%
MDW–LAS	Chicago to Las Vegas	250	83.6%	-1.3 min	0.0%
MDW–MSP	Chicago to Minneapolis	247	85.4%	-6.4 min	0.0%
MDW–MCO	Chicago to Orlando	214	84.1%	-0.8 min	0.0%
MDW–LGA	Chicago to New York	202	85.6%	-0.9 min	0.0%
MDW–DAL	Chicago to Dallas	193	81.9%	-1.1 min	0.0%
MDW–MCI	Chicago to Kansas City	190	85.3%	-0.5 min	0.0%
MDW–PHL	Chicago to Philadelphia	186	81.7%	2.6 min	0.5%
MDW–BWI	Chicago to Baltimore	179	86.6%	-1.0 min	0.0%
MDW–DTW	Chicago to Detroit	179	89.9%	0.9 min	0.0%

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), September 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2024	Minutes
Air carrier	43.9%	38.6%	18,880
Late-arriving aircraft	34.1%	38.4%	14,647
National Aviation System	20.4%	18.2%	8,766
Extreme weather	1.5%	4.8%	664
Security	0.1%	0.1%	53

43,010 delay minutes on 1,012 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 September 2024?

83.0% of 6,849 scheduled domestic departures left less than 15 minutes late, and 84.7% reached their destination on time. The national figures that month were 84.4% and 83.9%.

How does that compare with a year earlier?

In September 2023, 76.1% of 7,109 departures left on time and 0.6% were cancelled, against 83.0% and 0.3% in September 2024.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2024; 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.