ON TIMEBOARD
MDW Chicago / CHS Charleston

MDW → CHS on time

Chicago Midway (Chicago, IL) to Charleston (Charleston, SC). Every scheduled flight, September 2025 to August 2026.

On time
74%
arrived < 15 min late
Cancelled
1.1%
380 flights
Typical arrival
−2 min
median vs schedule
When late
+53 min
average delay
Flights / day
1
1 airline

74% of flights from Chicago to Charleston arrived on time over the past 12 months. That is worse than the typical U.S. route. 8% of flights arrived more than an hour late or not at all.

How late?

The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for MDW → CHS: when a flight was late, it was under 45 minutes late 61% of the time. About 1 in 16 flights landed an hour or more late, and 1 in 95 three hours or more; 1.1% were cancelled outright.

Share of all 380 scheduled flights, past 12 months, by arrival time against schedule.

By airline

AirlineFlightsOn timeCancelledTypical arrival1h+ lateAvg when lateOperated by
Southwest Airlines38074%1.1%−2 min6.3%+53 minSouthwest Airlines

Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.

Best time of day to fly

On-time rate by scheduled departure hour (local time at MDW). Delays build through the day as late planes knock on, so early flights usually do best.

40%70%100%8 a.m. departures: too few flights (35 flights)8a9 a.m. departures: too few flights (9 flights)9a10 a.m. departures: too few flights (4 flights)10a11 a.m. departures: too few flights (1 flights)11anoon departures: too few flights (37 flights)12p1 p.m. departures: too few flights (39 flights)1p2 p.m. departures: too few flights (10 flights)2p3 p.m. departures: too few flights (36 flights)3p4 p.m. departures: too few flights (26 flights)4p5 p.m. departures: too few flights (9 flights)5p6 p.m. departures: too few flights (97 flights)6p7 p.m. departures: too few flights (55 flights)7p
MDW → CHS, share of flights arriving on time, by departure hour. Hours with under 100 flights are greyed out.
82%+ on time76–82%68–76%under 68%too few flights

By month

Each calendar month pooled over 2023–2026. Best: March (85%). Worst: July (65%).

40%70%100%Jan: too few flights (53 flights)JanFeb: too few flights (68 flights)FebMar: 85% on time (123 flights)85MarApr: 80% on time (125 flights)80AprMay: 77% on time (129 flights)77MayJun: 67% on time (129 flights)67JunJul: 65% on time (127 flights)65JulAug: 74% on time (121 flights)74AugSep: 78% on time (122 flights)78SepOct: 82% on time (121 flights)82OctNov: too few flights (78 flights)NovDec: too few flights (74 flights)Dec

By day of week

DayFlightsOn timeCancelled
Monday59——
Tuesday38——
Wednesday35——
Thursday56——
Friday61——
Saturday51——
Sunday80——

Why flights were late

Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.

Late inbound plane 61%Airline (crew, maintenance, ops) 29%Air traffic & airport (NAS) 9%Security 1%

Cancellations: weather 3 · airline 1

Month by month

Not enough months with data to draw a trend.

Nearby airport alternatives

Other ways to make the same trip, using airports within 60 miles of Chicago or Charleston. None has been clearly more reliable than MDW → CHS.

RouteFlightsOn timeCancelled
MDW → CHS (this route)38074%1.1%
ORD → CHS Chicago O'Hare to Charleston2,15474%1.8%

Questions

How often are flights from MDW to CHS on time?

74% of 380 scheduled flights from Chicago, IL to Charleston, SC arrived within 15 minutes of schedule between September 2025 and August 2026. 1.1% were cancelled.

What month has the most delays from MDW to CHS?

July (65% on time). The best month is March (85%), over 2023–2026.

Related

Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.