Chicago Midway International in May 2025

75.9%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 May 2025, reporting carriers scheduled 6,128 domestic departures from Chicago Midway International (MDW). 75.9% left less than 15 minutes late and 78.3% reached their destination on time; 0.3% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so MDW departures were 0.8 points below the national departure figure.

A year earlier, in May 2024, the airport had 6,973 departures with 64.9% leaving on time: a change of +11.0 points, with flights down 12%.

Flights arriving at MDW that month were on time 79.5% of the time (6,127 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 48%, air carrier 26% and national aviation system 25%.

On time 78.3%
Arrived 15+ minutes late 21.1%
Cancelled 0.3%
Diverted 0.4%

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

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

Measure	May 2025	May 2024	MDW, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	75.9%	64.9%	70.7%	76.7%
Arrived on time	78.3%	65.7%	73.9%	75.4%
Cancelled	0.3%	0.6%	1.5%	1.0%
Average departure delay (late minutes only)	15.4 min	22.1 min	16.5 min	17.5 min
Scheduled departures a day	204	232	202	20,188
Scheduled departures	6,128	6,973	73,744	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	5,596	91%	78.1%	6.3 min	0.3%
OO SkyWest Airlines	186	3%	87.1%	0.1 min	0.0%
F9 Frontier Airlines	163	3%	70.6%	22.7 min	0.6%
DL Delta Air Lines	141	2%	81.6%	-1.5 min	0.0%
G4 Allegiant Air	42	1%	76.2%	6.1 min	2.4%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MDW–ATL	Chicago to Atlanta	330	79.4%	5.4 min	0.0%
MDW–PHX	Chicago to Phoenix	243	80.2%	1.9 min	0.4%
MDW–MSP	Chicago to Minneapolis	230	82.6%	8.5 min	0.0%
MDW–LAS	Chicago to Las Vegas	228	85.1%	-5.7 min	0.0%
MDW–DEN	Chicago to Denver	212	67.9%	11.6 min	1.9%
MDW–MCO	Chicago to Orlando	211	74.9%	10.2 min	0.9%
MDW–DAL	Chicago to Dallas	204	74.5%	7.9 min	2.0%
MDW–LGA	Chicago to New York	194	72.2%	16.3 min	0.5%
MDW–MCI	Chicago to Kansas City	182	86.8%	-1.3 min	0.0%
MDW–DTW	Chicago to Detroit	180	81.7%	6.2 min	0.0%
MDW–DCA	Chicago to Washington	176	73.9%	8.3 min	0.0%
MDW–BNA	Chicago to Nashville	170	85.3%	-1.5 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), May 2025.

Delay causes

BTS cause category	Share of delay minutes	National, May 2025	Minutes
Air carrier	26.0%	29.3%	20,580
Late-arriving aircraft	48.0%	37.8%	38,028
National Aviation System	24.7%	25.9%	19,569
Extreme weather	1.1%	6.9%	856
Security	0.1%	0.1%	115

79,148 delay minutes on 1,290 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 May 2025?

75.9% of 6,128 scheduled domestic departures left less than 15 minutes late, and 78.3% reached their destination on time. The national figures that month were 76.7% and 75.4%.

How does that compare with a year earlier?

In May 2024, 64.9% of 6,973 departures left on time and 0.6% were cancelled, against 75.9% and 0.3% in May 2025.

Provenance

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