Airports
Airport Delay Profile
Enter a U.S. airport code to see how reliably flights leave and land there, month by month — with the U.S. DOT's own split of why the delayed ones ran late — from the on-time performance filings over the last 12 months.
ORD
Chicago, IL
of ORD departures departed on time · Jun 2025 – May 2026 · 372,252 filed departures
- Cancelled
- 2.5%
- Diverted
- 0.3%
- Total flights
- 381,399
On-time departures rate, month by month
Why flights ran late — DOT delay-cause split
- Aircraft arriving late42.4%
- Air carrier28.8%
- National Aviation System19.7%
- Weather9.0%
- Security0.0%
Share of total filed delay minutes attributed to each cause. Bars are scaled to the largest cause for readability; the percentages are absolute.
Informational only — historical base rates from federal filings, not a prediction of any future flight. On-time means within 15 minutes of schedule (14 CFR § 234.2).
Methodology
Every figure is computed directly from the U.S. Department of Transportation's Marketing Carrier On-Time Performance filing (Bureau of Transportation Statistics, table 236), reduced to one row per airport per direction per month. For the window you choose, the tool sums those monthly rows and reports the direction you select.
- On-time % = flights within 15 minutes of schedule ÷ flights with a filed time. Departures are scored on departure time, arrivals on arrival time — the same 15-minute federal rule (14 CFR § 234.2) applied to whichever end the direction is about.
- Cancelled % and Diverted % are of all scheduled operations in that direction. A cancelled or diverted flight is never scored late, so they sit beside the on-time rate rather than inside it.
- Delay-cause split. The DOT files, for each delayed flight, how many minutes of its delay fall to each of five causes — air carrier, weather, National Aviation System, security, and a late-arriving inbound aircraft. The split here is each cause's summed minutes ÷ the total across all five, over the window and direction shown. Causes attach to the flight's arrival delay in the underlying data.
Scope & limits. U.S. domestic operations of reporting marketing carriers; this tool serves Jun 2025 onward. Only airports served by reporting carriers appear, and a direction with fewer than 30 filed flights over the window is shown without a rate. Historical performance only: no live tracking, and no predictions.
Last reviewed: July 2026
Frequently asked questions
What do the five delay causes mean?
They are the DOT's own categories, split by share of total delay minutes filed. Air carrier delay is within the airline's control (maintenance, crew, fuelling); weather is extreme conditions; National Aviation System covers air-traffic control, volume and non-extreme weather; security is screening or breaches; and late-arriving aircraft means the inbound plane for this flight showed up late. The last one is usually the largest — delay begets delay down the day.
Why can departures and arrivals at the same airport look different?
Because they are scored at different ends. Departure punctuality asks whether flights left this airport on time; arrival punctuality asks whether flights reached this airport on time. A hub can push planes out on schedule and still absorb late inbound traffic, so the two rates — and their cause splits — diverge. Toggle between them to see both.
What counts as "on time"?
The federal 15-minute rule: a flight is on time if it reaches the gate (arrivals) or leaves it (departures) less than 15 minutes after schedule. Fourteen minutes late still counts as on time; fifteen does not. Every figure here uses that definition unchanged (14 CFR § 234.2).
Does this cover every airport?
Only airports served by the reporting marketing carriers appear, and a direction with fewer than 30 filed flights over the window is shown without a rate — too small a sample to be a statistic rather than noise. Smaller regional fields the big carriers don't report may not appear at all.
Related tools
On-time departure rate by scheduled hour for a U.S. airport — the folk rule to fly early, quantified per airport from the federal record.
Open tool →Best Month to FlyOn-time departure rate by calendar month for a U.S. airport — which times of year run late, pooled across several years of the federal record.
Open tool →Route Reliability CheckOn-time arrival rates, typical and worst-case delays, and cancellations for every airline on a U.S. route — from the DOT's on-time filings.
Open tool →Airline On-Time RankingsEvery reporting U.S. airline ranked by on-time arrival rate over the last 12 months, with cancellation and diversion rates alongside — because a carrier can lift its on-time number by cancelling.
Open tool →