Chicago Midway International in April 2025

81.4%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 April 2025, reporting carriers scheduled 6,051 domestic departures from Chicago Midway International (MDW). 81.4% left less than 15 minutes late and 81.7% reached their destination on time; 0.5% were cancelled.

Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so MDW departures were 0.8 points above the national departure figure.

A year earlier, in April 2024, the airport had 6,791 departures with 77.8% leaving on time: a change of +3.6 points, with flights down 11%.

Flights arriving at MDW that month were on time 83.8% of the time (6,050 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 40%, air carrier 33% and national aviation system 22%.

On time 81.7%
Arrived 15+ minutes late 17.6%
Cancelled 0.5%
Diverted 0.2%

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

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

Measure	Apr 2025	Apr 2024	MDW, 12 months to Jul 2026	All reported flights, Apr 2025
Departed on time	81.4%	77.8%	70.7%	80.6%
Arrived on time	81.7%	79.5%	73.9%	79.5%
Cancelled	0.5%	0.3%	1.5%	0.8%
Average departure delay (late minutes only)	11.0 min	13.2 min	16.5 min	14.1 min
Scheduled departures a day	202	226	202	19,465
Scheduled departures	6,051	6,791	73,744	583,950

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	5,469	90%	81.9%	3.1 min	0.5%
F9 Frontier Airlines	246	4%	70.3%	13.5 min	3.3%
OO SkyWest Airlines	176	3%	88.1%	-0.2 min	0.0%
DL Delta Air Lines	127	2%	86.6%	-5.2 min	0.0%
G4 Allegiant Air	33	1%	84.8%	-1.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MDW–ATL	Chicago to Atlanta	310	78.1%	2.5 min	1.0%
MDW–PHX	Chicago to Phoenix	271	78.2%	5.8 min	0.4%
MDW–LAS	Chicago to Las Vegas	249	80.7%	3.6 min	0.4%
MDW–MCO	Chicago to Orlando	221	81.9%	0.0 min	1.4%
MDW–MSP	Chicago to Minneapolis	221	83.3%	1.4 min	0.5%
MDW–DEN	Chicago to Denver	215	75.3%	11.4 min	1.4%
MDW–DAL	Chicago to Dallas	195	79.0%	3.5 min	3.1%
MDW–LGA	Chicago to New York	190	82.6%	3.4 min	0.0%
MDW–MCI	Chicago to Kansas City	176	84.7%	0.1 min	0.0%
MDW–DTW	Chicago to Detroit	174	87.4%	1.9 min	0.6%
MDW–DCA	Chicago to Washington	173	84.4%	-3.3 min	0.6%
MDW–BNA	Chicago to Nashville	164	82.9%	1.9 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), April 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2025	Minutes
Air carrier	32.9%	32.7%	19,891
Late-arriving aircraft	40.1%	39.4%	24,267
National Aviation System	22.3%	22.2%	13,468
Extreme weather	4.5%	5.5%	2,735
Security	0.2%	0.2%	104

60,465 delay minutes on 1,062 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 April 2025?

81.4% of 6,051 scheduled domestic departures left less than 15 minutes late, and 81.7% reached their destination on time. The national figures that month were 80.6% and 79.5%.

How does that compare with a year earlier?

In April 2024, 77.8% of 6,791 departures left on time and 0.3% were cancelled, against 81.4% and 0.5% in April 2025.

Provenance

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