Route reliability record
GPT→ATL
Gulfport to Atlanta
- Flights
- 1,322
- Period
- September 2025 to August 2026
- Distance
- 352 mi
- Carriers
- 1
This route earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 1,322 GPT to ATL flights, with a median arrival 13 minutes early.
Best time to fly GPT to ATL: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 93.0% of the time and Tuesday flights 89.9%, against 86.7% for the route overall.
Set against the rest of the country, this route's record is 9 points better than the US average of 77.3%. That gap is worth roughly 94 fewer late arrivals for every thousand flights.
Key figures
On time
86.7%
Arrivals under 15 minutes late, of 1,298 completed flights
Avg delay
98 min
Across delayed arrivals only, not all flights
Cancelled
1.59%
National rate is 1.89%
Best carrier
Delta
86.7% on time across 1,322 flights
These figures cover 1,322 flights between September 2025 and August 2026. The median arrival is 13 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.
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Carrier by carrier
Which airline is most reliable on GPT to ATL
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 1,322 | 86.7% | 98 min | 1.59% | A |
Flight by flight
Flights on GPT to ATL
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Gulfport to Atlanta
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 1 of the top 2 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. GPT → ATLGulfport to Atlanta | Delta Air Lines | 85.3% | 86.7% | 1.59% | 5am–8am, Tue | DL 3155 06:00 |
| 2. MOB → ATLMobile to Atlanta | Delta Air Lines | 83.3% | 85.2% | 2.18% | 5am–8am, Wed | DL 1721 06:00 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 16 points, against half a point between the best and worst carrier.
- 5am–8am365 flights93.0%
- 8am–11am333 flights90.2%
- 11am–2pm43 flights76.7%
- 2pm–5pm314 flights85.8%
- 5pm–8pm267 flights76.8%
- 8pm–5am—
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 76.7% on time against 93.0% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 5am–8am window is the busiest, with 365 flights scheduled in it.
Explore
Filter GPT to ATL by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On GPT to ATL, the best departure window is 5am–8am at 93.0% on time and the worst is 11am–2pm at 76.7%, a wide gap of 16.3 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am93.0%
- 8–11am90.2%
- 11am–2pm76.7%
- 2–5pm85.8%
- 5–8pm76.8%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 21 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
July is the worst month at 73.9% on time, 21 points below April, the best at 94.8%. 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. March was the busiest month here, with 118 flights.
Across the week, Tuesday is the strongest day at 89.9% on time and Sunday the weakest at 82.4%, a spread of 8 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 46% of the 17,000 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 37%Carrier
- 13%National Airspace System
- 4%Extreme weather
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 17,000 reported delay minutes here, that single category outweighs weather by 10 to one. The split is drawn from 16,776 reported delay minutes.
The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,231 of the 17,000 delay minutes reported here.
Cancellations sit at 1.59% against a national 1.89%, which is ordinary. Diversions add another 0.23%.
Connections and stage length
What a delay here actually costs
6.3% 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 an hour and a half, which a normal layover absorbs.
At 352 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 82.5% on time across 1,322 flights, 4 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.
The sample behind these figures is 1,322 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in ATL after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 94.8% on time and July 73.9%, a swing of 21 points. If the dates move at all, move them out of July before you think about anything else. 1,298 completed flights over 12 months sit behind that.
Common questions
GPT to ATL questions
How often is GPT to ATL delayed?
About one flight in eight arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 13.3% of the 1,322 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is GPT to ATL compared with the rest of the country?
86.7% of flights arrive on time here against a national 77.3%, a difference of 9 points in its favour. That is worth a A on this site's grading scale.
What time of day has the fewest delays on GPT to ATL?
The 5am–8am departure window is the strongest at 93.0% on time. The 11am–2pm window is the weakest at 76.7%, 16 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 GPT to ATL?
July is the weakest month at 73.9% on time, compared with 94.8% in April. Across the year that is 21 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
- ATL to GPT — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- GPT to DFW, a related route84.9%
- LGA to ATL, a related route75.5%
- MCO to ATL, a related route74.9%
- Delta Air Lines on-time record86.7%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. GPT to ATL and ATL to GPT are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.