O'Hare vs. Midway: Which Chicago Airport Has Better On-Time Performance?

O'Hare and Midway post nearly identical departure on-time rates — 75.3% at O'Hare versus 75.1% at Midway — despite O'Hare handling more than four times the traffic. Midway pulls ahead on the metrics that matter most for a smooth trip: a better arrival on-time rate (79.8% vs. 75.4%) and a lower cancellation rate (1.1% vs. 1.8%).

Here's what the data shows:

• O'Hare (ORD) and Midway (MDW) have almost the same departure on-time rate — 75.3% vs. 75.1% — despite O'Hare handling 645,408 departures to Midway's 150,524.
• Midway beats O'Hare on arrivals (79.8% vs. 75.4% on-time) and cancellations (1.1% vs. 1.8%), a meaningful gap on both counts.
• O'Hare is one of the busiest airports in the country — 193 destinations and 13 airlines — which makes its near-parity with much smaller Midway on departures notable.
• Both airports' single worst hour for on-time performance falls in the 9–10 p.m. window, after a full day's delays have compounded.
• Based on FlightRecord's dataset of 14.1M US DOT flight records, June 2024–May 2026.

Which Chicago airport has better on-time performance: O'Hare or Midway?

It depends which number you're looking at. On departures, they're essentially tied. On arrivals and cancellations, Midway is clearly ahead. Here's the full comparison from FlightRecord's dataset covering June 2024 through May 2026:

• O'Hare (ORD) — 645,408 departures, 75.3% on-time departures, 75.4% on-time arrivals, 1.8% cancelled, 193 destinations, 13 airlines.
• Midway (MDW) — 150,524 departures, 75.1% on-time departures, 79.8% on-time arrivals, 1.1% cancelled, 87 destinations, 5 airlines.

O'Hare is one of the busiest airports in the United States by departure volume, so matching Midway's on-time departure rate almost exactly — while handling more than four times the traffic and serving more than double the destinations — is a stronger showing than the raw percentages alone suggest. See FlightRecord's most reliable airports ranking for how both compare to the rest of the country.

Does O'Hare's size actually hurt its on-time performance?

Less than you'd expect, at least on departures. O'Hare's 645,408 departures and 193 destinations make it one of the largest, most complex hub operations FlightRecord tracks, yet its 75.3% on-time departure rate lands within two-tenths of a percentage point of Midway's much smaller operation. Where size does show up is arrivals and cancellations: O'Hare's 1.8% cancellation rate is 64% higher than Midway's 1.1%, and its 75.4% arrival on-time rate trails Midway's 79.8% by 4.4 points. More connecting traffic, more gate contention, and more exposure to weather and air-traffic-control delays across a bigger network likely all play a role in that gap, even though FlightRecord's data can't isolate a single cause.

Why is Midway's arrival rate so much better than its departure rate?

Midway's 79.8% arrival on-time rate beats its own 75.1% departure on-time rate by 4.7 percentage points — the largest such gap between the two Chicago airports, and larger than O'Hare's essentially flat 0.1-point gap (75.3% departures vs. 75.4% arrivals). Average delay minutes back this up: Midway's average arrival delay (12.7 minutes) is well below its average departure delay implies, and well below O'Hare's 21.4-minute average arrival delay. Flights leaving Midway late appear to make up meaningful time in the air more often than flights leaving O'Hare late do.

What time of day should you avoid flying through O'Hare or Midway?

Both airports follow the same broad pattern — strong mornings, weak late evenings — but the specific worst hour differs:

• O'Hare — best hour is 5 a.m. (90.5% on-time, 6,220 flights); worst is 10 p.m. (62.2% on-time, 9,551 flights, a 33.1-minute average departure delay). O'Hare's busiest hour, 8 a.m., still performs well at 84.5% on-time across 55,714 flights — the single largest hourly volume of any airport in FlightRecord's dataset.
• Midway — best hour is 6 a.m. (94.5% on-time, 6,508 flights); worst is 9 p.m. (49.6% on-time, 6,862 flights, a 31.7-minute average departure delay) — Midway's worst hour is both earlier and worse, on-time-rate-wise, than O'Hare's. Midway's busiest hour, 9 a.m., holds up at 84.4% on-time across 12,640 flights.

An early-morning flight, ideally the 5–6 a.m. window, is the most reliable choice at both Chicago airports. A Midway flight scheduled for 9 p.m. is on time less than half the time in FlightRecord's dataset — the single weakest hour-airport combination in this comparison.

Which airlines are most reliable at O'Hare and Midway?

Chicago's two airports have very different carrier mixes, which shapes each one's on-time profile:

• O'Hare — Envoy Air (MQ), a regional partner carrier, posts the best on-time rate among O'Hare's higher-volume operators at 78.4% (93,949 flights). United (UA) is O'Hare's largest carrier by far with 190,032 flights at 77.3% on-time. American (AA) and SkyWest (OO) trail at 70.3% and 72.5% respectively, despite both carrying well over 100,000 flights each.
• Midway — Southwest (WN) carries the overwhelming majority of Midway's traffic, 138,242 of 150,524 total departures, at 74.7% on-time — close to the airport-wide average, since Southwest effectively is the Midway average. Delta (DL), a much smaller presence with 2,983 flights, posts the airport's best on-time rate at 84.1%.

Midway operates with just 5 airlines total versus O'Hare's 13, per FlightRecord's most reliable airlines ranking — a simpler carrier mix that likely contributes to its more predictable on-time pattern despite the airport's much smaller connecting role.

Should you fly O'Hare or Midway for a Chicago trip?

If your itinerary requires an O'Hare-only carrier or connection — most international flights and United's domestic network run through O'Hare — the reliability trade-off versus Midway is smaller than O'Hare's size and reputation might suggest, at least on departures. If you have a real choice of airline and airport, Midway's better arrival on-time rate and roughly one-third the cancellation rate make it the safer bet on paper, and its smaller scale is exactly the kind of connecting-hub trade-off FlightRecord covers in its guide to the best airports for connecting flights.

For other major US metros with more than one airport, FlightRecord has run the same comparison for New York's JFK, LaGuardia, and Newark and for Washington DC's Dulles, Reagan National, and BWI.

Methodology: we compared departure on-time rates, arrival on-time rates, cancellation rates, hourly on-time patterns, and per-carrier on-time rates across Chicago's two major airports, using FlightRecord's dataset of US DOT on-time performance records from June 2024 through May 2026. On-time is the DOT standard: arrived within 15 minutes of schedule.

These are historical patterns, not a guarantee for any specific upcoming flight — weather, air traffic control, and aircraft rotations can all push an individual departure well outside its airport's typical range. Check the current status of your own flight number before you travel.

Frequently Asked Questions

Is Midway more reliable than O'Hare?

On arrivals and cancellations, yes. FlightRecord's dataset shows Midway with a 79.8% arrival on-time rate versus O'Hare's 75.4%, and a 1.1% cancellation rate versus O'Hare's 1.8%. On departures the two are essentially tied — 75.1% at Midway versus 75.3% at O'Hare.

Why does O'Hare have so many more delays reported in the news than Midway?

Volume is the biggest factor: O'Hare handled 645,408 departures in FlightRecord's dataset versus Midway's 150,524, more than four times as many, so even a similar or slightly better on-time percentage produces far more individual delayed and cancelled flights in absolute terms at O'Hare. O'Hare's cancellation rate (1.8%) is also genuinely higher than Midway's (1.1%).

What is O'Hare's on-time rate compared to Midway's?

O'Hare posts a 75.3% on-time departure rate and a 75.4% on-time arrival rate. Midway posts a 75.1% on-time departure rate and a 79.8% on-time arrival rate. The two are nearly identical on departures; Midway pulls ahead once flights are in the air.

What time of day is most reliable for flying out of Chicago?

Early morning at both airports. O'Hare's best hour is 5 a.m. (90.5% on-time); Midway's best hour is 6 a.m. (94.5% on-time). Both airports' worst hours fall in the evening — 10 p.m. at O'Hare (62.2% on-time) and 9 p.m. at Midway (49.6% on-time, the lowest single-hour rate in this comparison).

Which airline is most reliable at O'Hare and Midway?

Among O'Hare's higher-volume carriers, Envoy Air's regional flights lead at 78.4% on-time, ahead of United's 77.3% across the airport's largest operation. At Midway, Delta posts the best on-time rate (84.1%) but carries a small share of traffic; Southwest, which operates roughly 92% of Midway's flights, posts 74.7% on-time.

How much data does this O'Hare vs. Midway comparison use?

This analysis is based on FlightRecord's dataset of 14.1 million US DOT Bureau of Transportation Statistics flight records covering June 2024 through May 2026 — including 645,408 O'Hare departures and 150,524 Midway departures, each with matched arrival and cancellation outcomes.