Carrier performance at one airport
DL→ATL
Delta Air Lines at Hartsfield-Jackson Atlanta International
- Departures
- 240,917
- Period
- September 2025 to August 2026
- Routes
- 25
- Rank here
- #2 of 12
Delta Air Lines at Atlanta lands a B, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 240,917 flights, of which United Airlines flew 7,672 at 79.7% on time.
Measured against the airport rather than the country, Delta Air Lines runs 2 points ahead of the 77.8% weighted average across all carriers at ATL. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.
Key figures
On time
79.5%
236,306 completed departures
Avg delay
59 min
Across delayed flights only
Cancelled
1.67%
At ATL, this carrier only
Rank here
#2
Of 12 carriers clearing the floor at ATL
These figures cover 241,000 flights between September 2025 and August 2026. The median arrival is 5 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Against the competition
Every carrier at ATL, ranked
The choice of carrier is not cosmetic here. United Airlines arrives on time 79.7% of the time; Frontier Airlines manages 63.7%. Sample sizes sit next to every figure, because a two-point gap across 20,778 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 7,672 | 79.7% | 84 min | 1.51% | B |
| Delta Air Lines (this page) | 240,917 | 79.5% | 59 min | 1.67% | B |
| Alaska Airlines | 1,359 | 78.7% | 54 min | 0.81% | B+ |
| PSA Airlines | 3,319 | 77.6% | 110 min | 5.33% | B− |
| Southwest Airlines | 17,133 | 76.4% | 59 min | 1.10% | B |
| American Airlines | 6,907 | 75.7% | 106 min | 1.90% | B |
| SkyWest Airlines | 6,699 | 75.1% | 106 min | 2.58% | B |
| Republic Airways | 3,135 | 74.9% | 84 min | 4.85% | C− |
| Envoy Air | 1,064 | 72.1% | 69 min | 2.54% | C |
| Spirit Airlines | 3,886 | 70.7% | 77 min | 4.01% | C− |
| JetBlue Airways | 2,858 | 69.1% | 89 min | 4.55% | C− |
| Frontier Airlines | 20,778 | 63.7% | 83 min | 2.42% | D |
PSA Airlines cancels 5.3% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Route by route
Where Delta Air Lines flies from ATL
Delta Air Lines operates 25 routes out of ATL with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| ATL to MCO · Orlando | 5,534 | 70.5% | 65 min | 1.32% | C |
| ATL to LGA · New York | 4,937 | 75.9% | 66 min | 3.48% | B− |
| ATL to TPA · Tampa | 4,452 | 74.3% | 59 min | 1.33% | C |
| ATL to FLL · Fort Lauderdale | 4,383 | 73.9% | 57 min | 1.78% | C |
| ATL to DCA · Washington | 3,850 | 66.7% | 60 min | 2.44% | C |
| ATL to JAX · Jacksonville | 3,845 | 76.4% | 56 min | 1.59% | B |
| ATL to LAX · Los Angeles | 3,817 | 79.1% | 57 min | 0.73% | B+ |
| ATL to RDU · Raleigh | 3,811 | 82.9% | 58 min | 1.34% | B |
| ATL to DTW · Detroit | 3,774 | 77.9% | 60 min | 0.50% | B+ |
| ATL to BOS · Boston | 3,731 | 74.4% | 61 min | 1.82% | C |
| ATL to PBI · West Palm Beach | 3,402 | 76.4% | 52 min | 1.62% | B |
| ATL to BHM · Birmingham | 3,371 | 83.1% | 64 min | 1.69% | B |
| ATL to BNA · Nashville | 3,369 | 80.6% | 56 min | 1.90% | B |
| ATL to MEM · Memphis | 3,345 | 81.4% | 64 min | 1.76% | B |
| ATL to LAS · Las Vegas | 3,324 | 76.5% | 57 min | 0.66% | B+ |
| ATL to MIA · Miami | 3,321 | 71.4% | 56 min | 1.81% | C |
| ATL to MSY · New Orleans | 3,276 | 83.5% | 59 min | 1.47% | B |
| ATL to CHS · Charleston | 3,232 | 82.3% | 56 min | 1.67% | B |
| ATL to MSP · Minneapolis | 3,227 | 81.1% | 55 min | 0.40% | B+ |
| ATL to AUS · Austin | 3,163 | 81.9% | 58 min | 1.49% | B |
| ATL to SAV · Savannah | 3,064 | 82.1% | 56 min | 1.50% | B |
| ATL to EWR · Newark | 3,038 | 71.5% | 69 min | 3.82% | C− |
| ATL to PHL · Philadelphia | 3,020 | 76.2% | 58 min | 3.11% | B− |
| ATL to SLC · Salt Lake City | 2,959 | 82.7% | 60 min | 0.44% | B+ |
| ATL to DEN · Denver | 2,807 | 79.0% | 52 min | 1.21% | B |
Flight by flight
Delta Air Lines flight numbers from ATL
394 Delta Air Lines flight numbers leaving ATL flew their main route often enough to have a record of their own. Grouped by destination.
- DL 1109to ABQ 14:2383.8%
- DL 1531to ABQ 20:5376.4%
- DL 2584to ALB 21:3675.3%
- DL 2945to ATW 20:3579.7%
- DL 1170to AUS 18:5973.0%
- DL 1397to AUS 14:1580.0%
- DL 1491to AUS 15:5074.7%
- DL 2011to AUS 11:0588.8%
- DL 2886to AUS 09:4088.5%
- DL 2976to AUS 08:0593.4%
- DL 3101to AVL 16:3081.6%
- DL 3116to AVL 22:4982.0%
- DL 1011to BDL 21:3573.7%
- DL 2735to BDL 15:4074.7%
- DL 2765to BDL 18:5974.0%
- DL 2951to BDL 08:1090.4%
- DL 2034to BHM 23:0080.1%
- DL 2484to BHM 16:2579.2%
- DL 3012to BHM 12:1586.8%
- DL 3100to BHM 08:0592.1%
- DL 1490to BNA 18:5971.9%
- DL 1693to BNA 16:5476.9%
- DL 3069to BNA 08:3192.7%
- DL 3121to BNA 23:0078.0%
- DL 874to BOI 10:0090.0%
- DL 300to BOS 19:5968.8%
- DL 350to BOS 12:4074.6%
- DL 518to BOS 16:5252.7%
- DL 726to BOS 13:4566.3%
- DL 821to BOS 18:1569.2%
- DL 855to BOS 09:1085.2%
- DL 862to BOS 11:1081.7%
- DL 865to BOS 22:4080.2%
- DL 987to BOS 07:2589.9%
- DL 2595to BOS 14:5962.5%
- DL 1027to BTV 20:1077.3%
- DL 2050to BUF 16:4273.6%
- DL 2334to BUF 21:5274.0%
- DL 483to BUR 10:2576.5%
- DL 801to BWI 08:5590.2%
- DL 1257to BWI 19:3068.5%
- DL 1267to BWI 15:3169.6%
- DL 2590to BWI 23:0579.0%
- DL 2711to BWI 11:0089.3%
- DL 2799to BWI 13:5578.6%
- DL 2928to BWI 17:5969.9%
- DL 3029to CAE 22:3981.2%
- DL 1381to CHS 14:4181.6%
- DL 2493to CHS 19:3080.8%
- DL 2850to CHS 22:4780.1%
- DL 3091to CHS 08:0592.9%
- DL 3107to CHS 10:3890.5%
- DL 2626to CID 21:1576.0%
- DL 1320to CLE 22:5077.7%
- DL 2545to CLE 13:4586.2%
- DL 3139to CLT 19:1072.3%
- DL 3177to CLT 22:4283.7%
- DL 1459to CMH 22:3078.5%
- DL 1501to CMH 19:0873.7%
- DL 2200to CMH 13:5986.6%
- DL 2786to CMH 17:2573.4%
- DL 2248to CVG 17:3275.2%
- DL 2395to CVG 22:5980.2%
- DL 3160to CVG 09:5088.7%
- DL 3034to DAB 22:3988.3%
- DL 441to DAL 08:1590.2%
- DL 512to DAL 13:5984.3%
- DL 1104to DAL 21:1581.2%
- DL 1115to DAL 10:0090.2%
- DL 2780to DAL 16:3476.5%
- DL 2763to DAY 13:3588.0%
- DL 3108to DAY 08:5589.0%
- DL 325to DCA 18:5558.3%
- DL 360to DCA 13:1069.7%
- DL 378to DCA 20:5565.8%
- DL 537to DCA 21:5967.3%
- DL 727to DCA 19:5553.3%
- DL 737to DCA 11:0079.2%
- DL 832to DCA 17:5555.1%
- DL 850to DCA 15:3054.7%
- DL 950to DCA 16:5063.7%
- DL 493to DEN 20:5477.2%
- DL 519to DEN 16:3566.7%
- DL 530to DEN 13:5580.5%
- DL 706to DEN 12:1584.7%
- DL 746to DEN 18:5967.8%
- DL 956to DEN 22:5975.4%
- DL 31to DFW 19:3067.5%
- DL 374to DFW 15:2569.1%
- DL 414to DFW 11:2881.5%
- DL 436to DFW 17:3566.8%
- DL 818to DFW 22:5979.7%
- DL 839to DFW 07:2579.8%
- DL 921to DFW 13:5976.1%
- DL 961to DFW 08:5687.8%
- DL 1704to DSM 09:3088.1%
- DL 2086to DSM 15:1580.7%
- DL 2306to DSM 21:1582.2%
- DL 1005to DTW 15:1575.2%
- DL 1031to DTW 13:0083.9%
- DL 1232to DTW 20:3066.8%
- DL 1240to DTW 11:0082.7%
- DL 1298to DTW 09:0084.3%
- DL 1478to DTW 18:4575.4%
- DL 1646to DTW 07:2590.6%
- DL 2067to DTW 16:4974.6%
- DL 2940to DTW 22:5972.6%
- DL 1359to ECP 12:3984.4%
- DL 2494to ECP 19:2881.7%
- DL 3094to ECP 15:1578.1%
- DL 3131to ECP 23:0083.4%
- DL 1002to ELP 11:0083.7%
- DL 1713to ELP 19:5274.4%
- DL 2312to EWR 14:2371.6%
- DL 2322to EWR 13:0974.5%
- DL 2340to EWR 15:3366.7%
- DL 2401to EWR 10:0584.0%
- DL 2498to EWR 18:3553.8%
- DL 2527to EWR 20:5962.9%
- DL 2552to EWR 22:5068.5%
- DL 1281to EYW 08:5590.4%
- DL 1472to EYW 11:1287.0%
- DL 2815to EYW 17:5077.2%
- DL 1229to FLL 22:4065.9%
- DL 1295to FLL 16:4067.3%
- DL 1334to FLL 07:2590.8%
- DL 1341to FLL 12:3073.7%
- DL 1413to FLL 13:2572.1%
- DL 1489to FLL 19:5865.2%
- DL 1512to FLL 10:2582.0%
- DL 1670to FLL 17:4560.9%
- DL 2345to FLL 15:2565.9%
- DL 2615to FSD 21:3077.8%
- DL 2793to GNV 08:1093.5%
- DL 3079to GNV 21:2584.5%
- DL 3133to GNV 14:5982.7%
- DL 3178to GPT 21:5279.6%
- DL 2948to GRB 21:3576.4%
- DL 2058to GRR 15:2082.4%
- DL 2210to GRR 19:5478.2%
- DL 2865to GRR 21:5981.9%
- DL 1617to GSO 20:5779.9%
- DL 2539to GSO 15:2085.9%
- DL 3005to GSO 22:4083.0%
- DL 2281to GSP 22:5480.8%
- DL 3095to GSP 15:0779.7%
- DL 837to HNL 09:5079.8%
- DL 1195to HOU 11:0583.7%
- DL 2051to HOU 21:1571.7%
- DL 1616to HPN 19:5974.0%
- DL 2182to HSV 12:0079.4%
- DL 3022to HSV 23:0086.0%
- DL 1309to IAD 19:5172.6%
- DL 1695to IAD 14:5975.6%
- DL 2549to IAD 22:5372.8%
- DL 1284to IAH 19:5971.6%
- DL 1585to IAH 07:3082.3%
- DL 1601to IAH 22:4075.0%
- DL 1682to IAH 10:1084.5%
- DL 2128to ICT 15:1580.3%
- DL 2959to ICT 20:4585.4%
- DL 3070to ILM 22:4080.6%
- DL 3120to IND 18:5979.9%
- DL 3134to IND 13:4881.4%
- DL 3117to JAN 23:0082.9%
- DL 1001to JAX 21:4568.4%
- DL 2276to JAX 22:5573.6%
- DL 2627to JAX 16:4568.7%
- DL 2720to JAX 15:2078.2%
- DL 2923to JAX 11:0085.0%
- DL 3024to JAX 12:2178.2%
- DL 1034to JFK 09:0089.2%
- DL 2378to JFK 16:5967.3%
- DL 2380to JFK 12:1580.7%
- DL 2398to JFK 15:5972.8%
- DL 2420to JFK 07:4389.3%
- DL 466to LAS 11:0079.3%
- DL 549to LAS 12:1576.9%
- DL 659to LAS 15:5077.6%
- DL 711to LAS 16:4077.4%
- DL 777to LAS 08:1585.5%
- DL 919to LAS 18:3074.7%
- DL 500to LAX 18:3074.0%
- DL 501to LAX 10:2585.0%
- DL 753to LAX 14:4582.4%
- DL 763to LAX 19:3063.7%
- DL 895to LAX 12:4087.6%
- DL 898to LAX 08:0589.0%
- DL 996to LAX 07:0088.6%
- DL 2213to LEX 22:4082.0%
- DL 323to LGA 07:3090.8%
- DL 371to LGA 10:3084.7%
- DL 404to LGA 06:0091.7%
- DL 433to LGA 15:3067.7%
- DL 434to LGA 18:0062.1%
- DL 460to LGA 13:3076.3%
- DL 467to LGA 11:3084.1%
- DL 468to LGA 19:3065.3%
- DL 490to LGA 20:3062.1%
- DL 513to LGA 08:3087.7%
- DL 520to LGA 21:3069.5%
- DL 524to LGA 14:3070.3%
- DL 525to LGA 12:3073.9%
- DL 557to LGA 09:3083.9%
- DL 997to LGA 17:0067.1%
- DL 2083to LIT 23:0084.2%
- DL 2701to LIT 20:1079.0%
- DL 3025to LIT 17:4577.8%
- DL 3040to LIT 10:3191.4%
- DL 1130to MCI 19:5978.0%
- DL 1470to MCI 17:4576.4%
- DL 2471to MCI 08:2092.4%
- DL 2908to MCI 10:0590.4%
- DL 2911to MCI 22:4079.8%
- DL 664to MCO 10:2584.0%
- DL 1030to MCO 11:2580.2%
- DL 1162to MCO 22:2067.8%
- DL 1213to MCO 08:1586.9%
- DL 1372to MCO 13:4571.2%
- DL 1497to MCO 17:1557.1%
- DL 1658to MCO 09:2583.4%
- DL 1733to MCO 21:3565.0%
- DL 1735to MCO 20:1563.2%
- DL 1742to MCO 16:0055.5%
- DL 2035to MCO 18:1556.8%
- DL 2881to MCO 19:2061.5%
- DL 1063to MDW 08:5985.6%
- DL 1076to MDW 21:1577.1%
- DL 2417to MDW 11:0087.3%
- DL 1681to MEM 14:0583.7%
- DL 1700to MEM 15:0878.4%
- DL 2001to MEM 20:1076.2%
- DL 2501to MEM 23:0074.4%
- DL 2939to MEM 17:5377.2%
- DL 1234to MIA 22:3061.4%
- DL 1323to MIA 13:4562.4%
- DL 1332to MIA 11:0082.2%
- DL 1510to MIA 08:5583.7%
- DL 1579to MIA 12:1575.3%
- DL 1588to MIA 18:5564.2%
- DL 1589to MIA 22:5769.9%
- DL 1151to MKE 10:1088.6%
- DL 1206to MKE 18:5974.4%
- DL 1246to MKE 12:5389.4%
- DL 1268to MKE 22:5580.9%
- DL 2152to MKE 16:3883.6%
- DL 2999to MKE 08:0591.6%
- DL 2435to MLB 22:1682.5%
- DL 3043to MLB 16:2577.1%
- DL 3118to MLB 08:5590.8%
- DL 2029to MOB 23:0581.3%
- DL 2144to MSN 21:3281.4%
- DL 2599to MSN 15:1583.0%
- DL 1280to MSP 19:5968.8%
- DL 1310to MSP 22:4577.6%
- DL 2090to MSP 09:5589.2%
- DL 2654to MSP 17:5968.6%
- DL 2668to MSP 07:2592.0%
- DL 2825to MSP 14:3184.1%
- DL 2901to MSP 12:1585.6%
- DL 2960to MSP 08:3589.0%
- DL 2981to MSP 15:5872.2%
- DL 1450to MSY 19:4075.8%
- DL 2224to MSY 23:0082.8%
- DL 2542to MSY 11:0588.0%
- DL 3146to MSY 15:1977.2%
- DL 3047to MYR 09:3079.9%
- DL 3074to MYR 22:3079.9%
- DL 2423to OKC 22:4481.9%
- DL 2490to OKC 09:0589.7%
- DL 2784to OKC 19:2181.1%
- DL 2862to OKC 15:1579.3%
- DL 2364to OMA 16:2576.3%
- DL 2707to OMA 19:0578.5%
- DL 665to ONT 09:4184.0%
- DL 1147to ORD 09:0079.0%
- DL 1199to ORD 22:5070.6%
- DL 1477to ORD 13:0272.9%
- DL 2738to ORD 15:5057.6%
- DL 2879to ORD 17:4245.6%
- DL 1346to ORF 17:1569.1%
- DL 2329to ORF 15:2774.5%
- DL 2338to ORF 22:4580.1%
- DL 2755to ORF 09:5786.6%
- DL 2925to ORF 11:0581.7%
- DL 2984to ORF 19:5974.5%
- DL 838to PBI 13:5978.4%
- DL 959to PBI 16:5273.5%
- DL 1065to PBI 22:5970.3%
- DL 1190to PBI 12:4480.5%
- DL 1458to PBI 15:1774.5%
- DL 1495to PBI 21:1574.8%
- DL 1606to PBI 19:5469.2%
- DL 478to PDX 19:4572.7%
- DL 503to PDX 16:5172.8%
- DL 539to PDX 08:3083.2%
- DL 1169to PHL 15:1570.0%
- DL 1329to PHL 16:2559.0%
- DL 2065to PHL 18:5963.5%
- DL 2642to PHL 22:5576.6%
- DL 348to PHX 08:1080.1%
- DL 757to PHX 19:5970.2%
- DL 836to PHX 16:5969.9%
- DL 842to PHX 21:5972.8%
- DL 1363to PIT 09:1091.0%
- DL 1013to PNS 14:3682.1%
- DL 2211to PNS 16:5078.0%
- DL 3021to PNS 19:5175.3%
- DL 3103to PNS 08:0592.6%
- DL 2064to PVD 21:4073.7%
- DL 1518to RDU 19:2076.0%
- DL 1699to RDU 08:4393.2%
- DL 2052to RDU 10:1590.5%
- DL 2600to RDU 15:5576.9%
- DL 1263to RIC 23:1075.8%
- DL 1348to RIC 17:0074.3%
- DL 1462to RIC 07:2593.2%
- DL 391to RNO 19:5770.4%
- DL 2372to ROA 23:0082.5%
- DL 2472to ROC 21:5674.1%
- DL 1089to RSW 08:0589.4%
- DL 1124to RSW 22:5571.8%
- DL 1153to RSW 10:1083.3%
- DL 1196to RSW 13:2782.4%
- DL 1217to RSW 22:5571.8%
- DL 1736to RSW 19:5965.6%
- DL 712to SAN 16:5980.1%
- DL 843to SAN 14:4077.2%
- DL 894to SAN 11:0078.0%
- DL 896to SAN 21:2876.6%
- DL 1408to SAT 12:1585.8%
- DL 1465to SAT 15:4077.5%
- DL 1508to SAT 23:0078.5%
- DL 1676to SAT 08:1591.3%
- DL 2893to SAT 19:0974.2%
- DL 2425to SAV 19:5979.2%
- DL 2860to SAV 22:5683.7%
- DL 3014to SAV 15:0380.3%
- DL 3054to SAV 10:3485.1%
- DL 1126to SDF 16:2578.0%
- DL 1374to SDF 08:0589.2%
- DL 1481to SDF 10:3088.8%
- DL 2624to SDF 22:4083.3%
- DL 3093to SDF 19:5977.8%
- DL 444to SEA 07:2578.3%
- DL 481to SEA 16:2978.4%
- DL 629to SEA 11:3080.4%
- DL 714to SEA 18:0065.0%
- DL 774to SEA 09:4084.6%
- DL 903to SEA 21:3577.7%
- DL 517to SFO 16:5965.4%
- DL 656to SFO 21:5971.8%
- DL 693to SFO 08:2581.2%
- DL 823to SFO 15:3564.8%
- DL 809to SJC 09:4090.0%
- DL 933to SJC 20:5985.1%
- DL 1757to SJU 08:0588.4%
- DL 1861to SJU 18:4566.0%
- DL 1882to SJU 10:0077.1%
- DL 387to SLC 10:0590.3%
- DL 423to SLC 13:5985.6%
- DL 453to SLC 21:1576.0%
- DL 526to SLC 15:1579.6%
- DL 653to SLC 17:4379.4%
- DL 660to SLC 19:3075.0%
- DL 663to SLC 11:5687.9%
- DL 830to SLC 08:1087.8%
- DL 682to SMF 20:5981.5%
- DL 743to SMF 17:5974.4%
- DL 904to SMF 09:0089.6%
- DL 329to SNA 09:5074.3%
- DL 826to SNA 20:5180.5%
- DL 1057to SRQ 21:1570.4%
- DL 2438to SRQ 12:4086.5%
- DL 2997to SRQ 22:3078.4%
- DL 3115to SRQ 17:1578.0%
- DL 3196to SRQ 08:0594.2%
- DL 1393to STL 17:1678.7%
- DL 1403to STL 23:1583.0%
- DL 1571to STL 08:0591.8%
- DL 2123to SYR 21:4074.5%
- DL 759to TPA 15:2568.5%
- DL 1227to TPA 08:2590.8%
- DL 1457to TPA 18:2065.9%
- DL 1525to TPA 12:2578.7%
- DL 1560to TPA 22:5971.5%
- DL 1594to TPA 17:3061.8%
- DL 1720to TPA 13:2570.5%
- DL 2043to TUL 21:2584.8%
- DL 1251to TUS 20:5576.2%
- DL 3072to TYS 22:5080.1%
- DL 2803to VPS 18:2879.8%
- DL 3083to VPS 16:0581.5%
- DL 3097to VPS 23:1581.7%
Departure window
Best time of day for this operation
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against 16 points between the best and worst carrier.
- 5am–8am10,247 flights89.3%
- 8am–11am51,844 flights87.7%
- 11am–2pm39,492 flights83.3%
- 2pm–5pm46,050 flights76.0%
- 5pm–8pm37,576 flights71.6%
- 8pm–5am55,708 flights75.8%
Scale runs 65% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.3% of the time, against 71.6% for the evening window. That is 18 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 55,708 flights scheduled in it.
Across the year
Seasonal pattern
July is the worst month at 68.1% on time, 19 points below September, the best at 87.2%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 21,774 flights.
Delay causes
What holds this operation up
- 47%Carrier
- 24%National Airspace System
- 23%Late-arriving aircraft
- 5%Extreme weather
- 0%Security
The largest share of delay minutes, 47%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1.35 million of the 2.86 million delay minutes reported here. The split is drawn from 2,862,814 reported delay minutes.
Cancellations sit at 1.67% against a national 1.89%, which is ordinary. Diversions add another 0.24%.
6.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
240,917 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 87.2% on time and July 68.1%, a swing of 19 points. If the dates move at all, move them out of July before you think about anything else. 236,306 completed flights over 12 months sit behind that.
Common questions
Delta Air Lines at ATL
How often is Delta Air Lines at ATL delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 20.5% of the 240,917 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on Delta Air Lines at ATL?
United Airlines leads at 79.7% on time across 7,672 flights. Frontier Airlines is at the other end on 63.7%, a gap of 16 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on Delta Air Lines at ATL?
The 5am–8am departure window is the strongest at 89.3% on time. The 5pm–8pm window is the weakest at 71.6%, 18 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on Delta Air Lines at ATL?
July is the weakest month at 68.1% on time, compared with 87.2% in September. Across the year that is 19 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- Delta Air Lines network-wide record
- Hartsfield-Jackson Atlanta International (ATL) all carriers
- ATL to MCO route record70.5%
- ATL to LGA route record75.9%
- ATL to TPA route record74.3%
- ATL to FLL route record73.9%
- Do airlines run better at their own hubs?
- The best time of day to fly, according to 7.05 million flight records
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.