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Route Reliability

Atlanta → Chicago

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

64
A Little Dicey
WanderNerd Reliability Score
71%
Arrive within 15 minutes
18 min
Average arrival delay
2.2%
Cancelled
6,390
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.United Airlines77%1,592 flights
  2. 2.American Airlines73%1,372 flights
  3. 3.Delta Air Lines69%2,622 flights
  4. 4.Frontier Airlines62%706 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.

ATL–ORD flights departing between 6–9 AM arrived on time 85% of the time, versus 57% between 6–9 PM.

Skip Monday if you can.

ATL–ORD flights arrived on time 76% of the time on Wednesdays. On Mondays: 67%.

United Airlines runs this route best.

United Airlines arrived on time 77% of the time on this route; Frontier Airlines managed 62%.

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
  • Mon67%(922 flights)
  • Tue74%(874 flights)
  • Wed76%(884 flights)
  • Thu72%(914 flights)
  • Fri70%(917 flights)
  • Sat73%(794 flights)
  • Sun69%(911 flights)
On-time by departure window
  • 3–6 AM—(5 flights)
  • 6–9 AM85%(1103 flights)
  • 9 AM–12 PM81%(1439 flights)
  • 12–3 PM78%(645 flights)
  • 3–6 PM61%(1434 flights)
  • 6–9 PM57%(1014 flights)
  • 9 PM–12 AM65%(576 flights)
On-time trend by month
74%
May

Jun 69% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%556
July 202568%551
August 202579%559
September 202585%540
October 202577%567
November 202569%497
December 202561%473
January 202669%435
February 202677%445
March 202660%479
April 202668%528
May 202674%586

Same trip, other airports

Keep nerding

Based on 6,390 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.