Chicago Midway International in May 2026

68.3%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 2026, reporting carriers scheduled 6,269 domestic departures from Chicago Midway International (MDW). 68.3% left less than 15 minutes late and 73.6% reached their destination on time; 0.4% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so MDW departures were 8.8 points below the national departure figure.

A year earlier, in May 2025, the airport had 6,128 departures with 75.9% leaving on time: a change of −7.6 points, with flights up 2%.

Flights arriving at MDW that month were on time 73.7% of the time (6,266 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 41%, air carrier 39% and national aviation system 18%.

On time 73.6%
Arrived 15+ minutes late 25.8%
Cancelled 0.4%
Diverted 0.3%

Every scheduled departure from MDW in May 2026, judged by arrival at the destination.

May 2026 against a year earlier, the airport's year and the nation

Measure	May 2026	May 2025	MDW, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	68.3%	75.9%	70.7%	77.1%
Arrived on time	73.6%	78.3%	73.9%	77.6%
Cancelled	0.4%	0.3%	1.5%	0.9%
Average departure delay (late minutes only)	17.4 min	15.4 min	16.5 min	16.0 min
Scheduled departures a day	209	204	202	20,391
Scheduled departures	6,269	6,128	73,744	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	5,999	96%	73.3%	8.2 min	0.3%
DL Delta Air Lines	118	2%	82.2%	9.1 min	0.8%
F9 Frontier Airlines	106	2%	76.4%	9.7 min	0.9%
G4 Allegiant Air	28	0%	71.4%	43.6 min	0.0%
OO SkyWest Airlines	18	0%	88.9%	-14.2 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MDW–ATL	Chicago to Atlanta	298	75.2%	9.5 min	0.3%
MDW–PHX	Chicago to Phoenix	235	76.6%	8.0 min	0.9%
MDW–LAS	Chicago to Las Vegas	202	78.2%	4.3 min	0.0%
MDW–LGA	Chicago to New York	202	67.3%	14.3 min	2.5%
MDW–MCO	Chicago to Orlando	199	76.4%	7.2 min	0.5%
MDW–DAL	Chicago to Dallas	176	71.0%	7.3 min	1.7%
MDW–DCA	Chicago to Washington	176	61.9%	14.6 min	0.0%
MDW–MCI	Chicago to Kansas City	176	76.7%	10.0 min	0.0%
MDW–BNA	Chicago to Nashville	172	73.8%	7.5 min	0.0%
MDW–DEN	Chicago to Denver	163	76.1%	6.2 min	0.6%
MDW–STL	Chicago to St. Louis	156	78.2%	1.6 min	0.6%
MDW–HOU	Chicago to Houston	150	65.3%	12.7 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 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	39.4%	33.0%	33,866
Late-arriving aircraft	41.3%	40.4%	35,505
National Aviation System	17.5%	20.5%	15,010
Extreme weather	1.8%	6.0%	1,548
Security	0.1%	0.1%	50

85,979 delay minutes on 1,618 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 2026?

68.3% of 6,269 scheduled domestic departures left less than 15 minutes late, and 73.6% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 75.9% of 6,128 departures left on time and 0.3% were cancelled, against 68.3% and 0.4% in May 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2026; 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.