OnTimeStats

Historical on-time performance

MDWATL

Chicago to Atlanta

590 miData through Dec 2025Source: US DOT · BTS

Flights on MDW–ATL arrive on time 79% of the time over the last 12 months.

On-time rate79%arrived within 15 min
Median delayon timetypical arrival
p90 delay35 min1 in 10 flights is worsetail risk
Cancelled1.7%of scheduled flights

based on 3,550 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Delta Air Linesbest
    On-time83%
    Medianon time
    p9030 min
    Cancel2.2%
    Flights1,441
  • Southwest Airlines
    On-time78%
    Medianon time
    p9035 min
    Cancel1.2%
    Flights1,628
  • Frontier Airlines
    On-time67%
    Medianon time
    p9055 min
    Cancel2.3%
    Flights481

Why flights run late

Delay causes

  • Airline34%
  • Weather3%
  • Air traffic (NAS)21%
  • Late aircraft42%
  • Security1%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

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Keep exploring

Related pages

Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.