Chicago Midway International in September 2023

76.1%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 2023, reporting carriers scheduled 7,109 domestic departures from Chicago Midway International (MDW). 76.1% left less than 15 minutes late and 75.6% reached their destination on time; 0.6% were cancelled.

Nationally that month, 80.5% of flights departed on time and 80.1% arrived on time, so MDW departures were 4.4 points below the national departure figure.

Flights arriving at MDW that month were on time 82.7% of the time (7,103 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 42%, air carrier 35% and national aviation system 22%.

On time 75.6%
Arrived 15+ minutes late 23.5%
Cancelled 0.6%
Diverted 0.3%

Every scheduled departure from MDW in September 2023, judged by arrival at the destination.

September 2023 against a year earlier, the airport's year and the nation

Measure	Sep 2023	Year earlier	MDW, 12 months to Jul 2026	All reported flights, Sep 2023
Departed on time	76.1%	—	70.7%	80.5%
Arrived on time	75.6%	—	73.9%	80.1%
Cancelled	0.6%	—	1.5%	1.2%
Average departure delay (late minutes only)	13.0 min	—	16.5 min	14.1 min
Scheduled departures a day	237	—	202	18,978
Scheduled departures	7,109	—	73,744	569,338

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	6,361	89%	75.5%	8.0 min	0.4%
F9 Frontier Airlines	440	6%	68.0%	12.3 min	3.6%
OO SkyWest Airlines	164	2%	89.0%	-5.8 min	0.0%
DL Delta Air Lines	114	2%	89.5%	3.4 min	0.0%
G4 Allegiant Air	30	0%	83.3%	1.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MDW–DEN	Chicago to Denver	315	77.5%	5.5 min	1.3%
MDW–ATL	Chicago to Atlanta	310	83.2%	5.6 min	0.0%
MDW–MSP	Chicago to Minneapolis	289	85.5%	-1.6 min	0.3%
MDW–PHX	Chicago to Phoenix	265	70.2%	10.0 min	1.5%
MDW–LAS	Chicago to Las Vegas	261	64.4%	11.8 min	0.8%
MDW–LGA	Chicago to New York	211	67.3%	15.2 min	4.3%
MDW–DTW	Chicago to Detroit	204	80.9%	6.6 min	0.0%
MDW–DAL	Chicago to Dallas	195	75.4%	8.6 min	0.0%
MDW–MCI	Chicago to Kansas City	190	73.2%	8.7 min	0.0%
MDW–MCO	Chicago to Orlando	187	79.7%	6.7 min	1.1%
MDW–STL	Chicago to St. Louis	185	78.4%	5.5 min	1.1%
MDW–DCA	Chicago to Washington	180	70.0%	12.3 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), September 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2023	Minutes
Air carrier	34.5%	36.4%	27,742
Late-arriving aircraft	41.9%	38.3%	33,675
National Aviation System	22.1%	19.9%	17,773
Extreme weather	1.3%	5.1%	1,027
Security	0.1%	0.2%	120

80,337 delay minutes on 1,672 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 2023?

76.1% of 7,109 scheduled domestic departures left less than 15 minutes late, and 75.6% reached their destination on time. The national figures that month were 80.5% and 80.1%.

How does that compare with a year earlier?

September 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2023; 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.