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Route Reliability

Chicago → Atlanta

ORD–ATL · 606 miles · Chicago O'Hare International Airport to Hartsfield–Jackson Atlanta International Airport

71
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
13 min
Average arrival delay
2.2%
Cancelled
6,391
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.Delta Air Lines80%2,621 flights
  2. 2.United Airlines76%1,592 flights
  3. 3.American Airlines70%1,371 flights
  4. 4.Frontier Airlines66%709 flights

Not enough history to rank: Spirit Airlines (98 flights). We rank airlines only after 100 flights on the route.

What the data says

Morning-you made the right choice.

ORD–ATL flights departing between 6–9 AM arrived on time 86% of the time, versus 58% between 6–9 PM.

Skip Monday if you can.

ORD–ATL flights arrived on time 78% of the time on Tuesdays. On Mondays: 70%.

Delta Air Lines runs this route best.

Delta Air Lines arrived on time 80% of the time on this route; Frontier Airlines managed 66%.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon70%(923 flights)
  • Tue78%(872 flights)
  • Wed78%(888 flights)
  • Thu77%(921 flights)
  • Fri73%(914 flights)
  • Sat77%(800 flights)
  • Sun71%(917 flights)
On-time by departure window
  • 3–6 AM84%(559 flights)
  • 6–9 AM86%(1113 flights)
  • 9 AM–12 PM82%(1478 flights)
  • 12–3 PM73%(1045 flights)
  • 3–6 PM66%(880 flights)
  • 6–9 PM58%(1159 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
77%
May

Jun 66% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202566%552
July 202567%550
August 202579%560
September 202588%542
October 202580%568
November 202578%498
December 202566%474
January 202674%434
February 202683%445
March 202664%485
April 202675%538
May 202677%589

Same trip, other airports

Keep nerding

Based on 6,391 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.