Route Reliability

Route reliability

Columbus (CMH) to Atlanta (ATL): which airline is most on time?

On-time arrivals, cancellations and long delays for every airline that reported nonstop flights from Columbus, OH (CMH) to Atlanta, GA (ATL), September 2025 to August 2026.

Historical performance Official DOT data through August 2026 · Not live flight status

Columbus, OHAtlanta, GA

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Three-letter airport codes, nonstop U.S. domestic flights. One direction at a time.

Route at a glance · September 2025 to August 2026

CMH to ATL

Columbus, OH to Atlanta, GA

On time
83.3%vs 75.6% U.S. average Better than average
Cancelled
1.4%vs 1.9% U.S. average Better than average
60+ min late
6.1%vs 8.1% U.S. average Better than average
Scheduled flights
3,129in 12 months3 airlines
Most reliable airline
Delta Air Lines85.6% on time · 2,678 flights

On time more often than the U.S. average, with fewer cancellations.

Compared with all U.S. flights, September 2025 to August 2026. “About average” means within 1.5 points for on time, 0.3 for cancelled and 1 for 60+ minutes late.

Airlines on this route

Ranked by on-time arrival

Airlines from CMH to ATL, September 2025 to August 2026. Rates are shares of all scheduled flights.
Airline On time Cancelled 60+ min late Avg delay when late Diverted Flights
1. Delta Air Lines Most reliable 85.6% 1.4% 5.8% 91 min 0.3% 2,678
2. Southwest Airlines 79.6% 1.0% 4.2% 48 min 0.3% 309
3. Frontier Airlines Small sample (under 300 flights) 48.6% 3.5% 16.2% 67 min 0.0% 142

On time = arrived within 15 minutes of schedule. Avg delay when late = average arrival delay of flights 15+ minutes late. "Most reliable" needs at least 300 flights in 12 months. Tap a heading to sort.

What this means

Delta Air Lines has the strongest record on this route.

  • Delta Air Lines had the best on-time record from Columbus (CMH) to Atlanta (ATL): 85.6% of its 2,678 scheduled flights arrived within 15 minutes of schedule, compared with 79.6% for Southwest Airlines.
  • 1.4% of flights on this route were cancelled (about 1 in 71), 0.5 points lower than the U.S. average of 1.9%.
  • 6.1% of flights, about 1 in 16, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 82 min.
  • Overall, 83.3% of flights on this route arrived on time, 7.7 points higher than the U.S. average of 75.6%.
  • Over the last 3 years, October was the most reliable month on this route (91.6% on time) and July the least reliable (75.2%).
  • Cancellations peaked in January, when 2.8% of flights were cancelled.
  • Flights scheduled to depart 3 pm to 4 pm were the most punctual (94.4% on time); flights scheduled to depart 5 pm to 6 pm were the least (70.7%).
  • In the other direction, Atlanta (ATL) to Columbus (CMH), 78.7% of flights were on time and 1.4% were cancelled. Compare airlines ATL to CMH.

Best and worst months to fly CMH to ATL

Jan 77.5%
Feb 85.7%
Mar 85.5%
Apr 89.5%
May 81.8%
Jun 84.6%
Jul 75.2%
Aug 85.3%
Sep 91.1%
Oct 91.6%
Nov 90.6%
Dec 84.5%
Share of scheduled flights on time 12-month average 83.3%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 77.5% 717
February 85.7% 656
March 85.5% 736
April 89.5% 768
May 81.8% 833
June 84.6% 849
July 75.2% 871
August 85.3% 845
September 91.1% 805
October 91.6% 838
November 90.6% 768
December 84.5% 772
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
Delta Air Lines October (94.3%) July (76.9%)
Southwest Airlines November (90.5%) May (71.9%)

Month by month, last 12 months

Sep 93.1%
Oct 87.4%
Nov 86.2%
Dec 77.5%
Jan 78.1%
Feb 84.4%
Mar 77.7%
Apr 91.2%
May 85.6%
Jun 84.4%
Jul 72.8%
Aug 81.1%
Share of scheduled flights on time U.S. average 75.6%
All airlines combined, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Sep 2025 93.1% 277
Oct 2025 87.4% 294
Nov 2025 86.2% 254
Dec 2025 77.5% 253
Jan 2026 78.1% 233
Feb 2026 84.4% 218
Mar 2026 77.7% 247
Apr 2026 91.2% 249
May 2026 85.6% 270
Jun 2026 84.4% 270
Jul 2026 72.8% 294
Aug 2026 81.1% 270

Best and worst departure times

6a 88.9%
7a 90.5%
8a 84.4%
9a 85.7%
10a 88.7%
11a 85.5%
12p 81.2%
1p 84.7%
2p 73.9%
3p 94.4%
4p 83.1%
5p 70.7%
6p 74.9%
7p 77.1%
8p Insufficient sample
Share of scheduled flights on time
By scheduled local departure hour at CMH, September 2025 to August 2026. Hours with no scheduled flights are omitted. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing 6 am to 7 am 88.9% 361
Departing 7 am to 8 am 90.5% 336
Departing 8 am to 9 am 84.4% 302
Departing 9 am to 10 am 85.7% 105
Departing 10 am to 11 am 88.7% 186
Departing 11 am to noon 85.5% 172
Departing noon to 1 pm 81.2% 393
Departing 1 pm to 2 pm 84.7% 255
Departing 2 pm to 3 pm 73.9% 115
Departing 3 pm to 4 pm 94.4% 108
Departing 4 pm to 5 pm 83.1% 213
Departing 5 pm to 6 pm 70.7% 147
Departing 6 pm to 7 pm 74.9% 315
Departing 7 pm to 8 pm 77.1% 96
Departing 8 pm to 9 pm Insufficient sample 25
Woman at an airport window watching a plane take off
Photo: Depositphotos (licensed stock, illustrative only). Credits

Sources & data dates

Source
U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
Period
September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
Data through
August 2026
Processed
2026-11-03
Scope
Nonstop scheduled flights from Columbus, OH (CMH) to Atlanta, GA (ATL), one direction. Airlines that report to the DOT only.
Method
Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.

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