Airport month record
MDWJUL
Chicago Midway International in July 2025
- Departures
- 7,531
- Month
- July 2025
- National, same month
- 71.1%
- Carriers
- 5
Historical statistics for July 2025, not live status or a forecast for this year’s July. For today’s conditions at MDW, see live FAA status.
MDW in July draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 7,531 flights, with a median arrival 2 minutes late.
Key figures
On time
67.2%
Arrivals under 15 minutes late, of 7,370 completed departures
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
1.81%
Nationally in July: 2.45%
Whole year
75.1%
MDW across all twelve months
These figures cover 7,531 departures from Chicago Midway International in July 2025. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.
Against the year
July next to MDW's other months
Against MDW's own year, July ran 8 points worse than the twelve-month rate of 75.1%, which makes it number eleven of twelve months, best first.
| Month | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| July 2025 (this page) | 7,531 | 67.2% | 69 min | 1.81% | C |
| August 2025 | 6,731 | 77.8% | 58 min | 0.74% | B+ |
| September 2025 | 6,459 | 84.1% | 46 min | 0.06% | B+ |
| October 2025 | 6,536 | 80.2% | 45 min | 0.17% | B+ |
| November 2025 | 5,620 | 80.6% | 59 min | 4.96% | B− |
| December 2025 | 5,738 | 69.7% | 57 min | 0.45% | C+ |
| January 2026 | 4,848 | 80.9% | 50 min | 2.15% | B |
| February 2026 | 4,537 | 81.6% | 46 min | 0.90% | B+ |
| March 2026 | 6,508 | 68.7% | 67 min | 3.89% | C− |
| April 2026 | 6,282 | 77.6% | 52 min | 1.18% | B |
| May 2026 | 6,269 | 74.0% | 53 min | 0.35% | C+ |
| June 2026 | 6,937 | 64.2% | 60 min | 1.53% | D |
Departure window
The best time of day to leave MDW in July
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 41 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am996 flights87.8%
- 8am–11am1,633 flights82.9%
- 11am–2pm1,162 flights71.5%
- 2pm–5pm1,156 flights58.3%
- 5pm–8pm1,158 flights55.5%
- 8pm–5am1,426 flights47.3%
Scale runs 40% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 47.3% on time, against 87.8% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8am–11am window is the busiest, with 1,633 flights scheduled in it.
Across the week, Tuesday is the strongest day at 78.4% on time and Sunday the weakest at 60.9%. 18 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at MDW in July
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 7,029 | 67.1% | 68 min | 1.89% | C |
| Frontier Airlinesthin sample | 159 | 61.4% | 70 min | 0.63% | D+ |
| SkyWest Airlinesthin sample | 149 | 73.2% | 76 min | 0.00% | C+ |
| Delta Air Linesthin sample | 138 | 75.6% | 86 min | 1.45% | B |
| Allegiant Airthin sample | 56 | 60.7% | 85 min | 0.00% | D+ |
Route by route
Busiest routes out of MDW in July
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MDW to ATL · Atlantathin sample | 324 | 70.8% | 82 min | 1.54% | C |
| MDW to DEN · Denverthin sample | 299 | 61.7% | 78 min | 1.00% | D |
| MDW to MCO · Orlandothin sample | 259 | 71.2% | 63 min | 2.32% | C |
| MDW to LAS · Las Vegasthin sample | 258 | 69.2% | 65 min | 1.16% | C |
| MDW to PHX · Phoenixthin sample | 252 | 69.5% | 74 min | 1.19% | C |
| MDW to MSP · Minneapolisthin sample | 249 | 69.4% | 69 min | 0.40% | C+ |
| MDW to LGA · New Yorkthin sample | 204 | 63.8% | 70 min | 6.86% | D− |
| MDW to MCI · Kansas Citythin sample | 203 | 72.2% | 75 min | 2.46% | C |
| MDW to DAL · Dallasthin sample | 202 | 69.4% | 76 min | 2.48% | C |
| MDW to BWI · Baltimorethin sample | 188 | 64.8% | 82 min | 4.26% | D− |
| MDW to HOU · Houstonthin sample | 186 | 61.1% | 46 min | 2.15% | D |
| MDW to DCA · Washingtonthin sample | 181 | 65.1% | 95 min | 6.63% | C− |
| MDW to BNA · Nashvillethin sample | 175 | 70.3% | 73 min | 1.14% | C |
| MDW to BOS · Bostonthin sample | 172 | 67.9% | 69 min | 2.33% | C |
| MDW to STL · St. Louisthin sample | 169 | 71.3% | 64 min | 1.18% | C |
| MDW to TPA · Tampathin sample | 163 | 61.6% | 70 min | 2.45% | D |
| MDW to PHL · Philadelphiathin sample | 153 | 63.1% | 87 min | 2.61% | D |
| MDW to DTW · Detroitthin sample | 153 | 67.3% | 70 min | 1.96% | C |
| MDW to OMA · Omahathin sample | 149 | 70.3% | 58 min | 2.01% | C |
| MDW to LAX · Los Angelesthin sample | 146 | 67.6% | 57 min | 0.68% | C+ |
| MDW to AUS · Austinthin sample | 133 | 66.2% | 56 min | 1.50% | C |
| MDW to CMH · Columbusthin sample | 131 | 72.1% | 79 min | 0.76% | C+ |
| MDW to RDU · Raleighthin sample | 119 | 68.4% | 78 min | 1.68% | C |
| MDW to CLE · Clevelandthin sample | 114 | 67.5% | 52 min | 0.00% | C+ |
| MDW to PIT · Pittsburghthin sample | 105 | 68.6% | 80 min | 0.00% | C+ |
Delay causes
What held MDW up in July
One category carries most of the weight here. Late-arriving aircraft accounts for 51% of the 167,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 51%Late-arriving aircraft
- 29%Carrier
- 15%National Airspace System
- 5%Extreme weather
- 0%Security
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 167,000 reported delay minutes here, that single category outweighs weather by 11 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 166,705 reported delay minutes.
Cancellations sit at 1.81% against a national 2.45%, which is ordinary. Diversions add another 0.33%.
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.3% of arrivals land a full hour or more behind schedule, against 12.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
What to do with this
Flying from MDW in July
For a July trip through MDW: plan on this being one of the airport's harder months. The 5am–8am departures held up best at 87.8% on time, and with 12.3% of arrivals an hour or more late, a connection here deserves more slack than the same trip in September would.
Related
Where to go next
- Chicago Midway International (MDW), the whole year
- MDW in August77.8%
- MDW in September84.1%
- MDW in October80.2%
- MDW in November80.6%
- MDW in December69.7%
- MDW in January80.9%
- MDW in February81.6%
- MDW in March68.7%
- MDW in April77.6%
- MDW in May74.0%
- MDW in June64.2%
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.