Best Time to Fly ATL to GPT: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Gulfport-Biloxi International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 83.4% of Atlanta (ATL) to Gulfport/Biloxi (GPT) flights arrived on time (1,317 scheduled flights). That is 5.8 points above the national average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
October has been the best month (91% on time) and Sunday the weakest day of the week (77%).
1.6% of flights were cancelled, versus 1.8% nationally.
ATL to GPT on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 83.4% | 67 min | 1.6% | 1,317 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to GPT
On-time arrival % by scheduled departure hour (local time), 2,628 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 94.5% | 2.0% | 354 |
| 9am–10am | 88.1% | 2.1% | 335 |
| 10am–11am | Limited data | 16 | |
| 11am–12pm | 89.5% | 0.0% | 38 |
| 12pm–1pm | 83.8% | 0.0% | 192 |
| 1pm–2pm | 84.2% | 0.7% | 286 |
| 2pm–3pm | 81.0% | 3.3% | 60 |
| 3pm–4pm | 84.0% | 1.9% | 108 |
| 4pm–5pm | 74.6% | 1.4% | 371 |
| 5pm–6pm | 83.6% | 0.7% | 136 |
| 6pm–7pm | Limited data | 4 | |
| 7pm–8pm | Limited data | 9 | |
| 8pm–9pm | 78.0% | 3.8% | 53 |
| 9pm–10pm | 78.3% | 1.9% | 521 |
| 10pm–11pm | 82.1% | 0.0% | 67 |
| 11pm–12am | 88.5% | 0.0% | 78 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ATL to GPT
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 83.3% | -1.1 pts | 0.0% | 48 |
| Christmas & New Year (Dec 20 - Jan 3) | 76.0% | -8.5 pts | 1.2% | 80 |
| Summer peak (Jun 15 - Aug 15) | 79.8% | -4.6 pts | 1.3% | 469 |
| All other days | 84.4% | — | 1.5% | 2,031 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).