Route reliability record
ATL→MOB
Atlanta to Mobile
- Flights
- 926
- Period
- September 2025 to August 2026
- Distance
- 302 mi
- Carriers
- 2
This route 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 a little over an hour on average. That rests on 926 ATL to MOB flights, with a median arrival 7 minutes early.
Best time to fly ATL to MOB: a 11am–2pm departure, ideally on a Wednesday. Flights in that window arrived on time 85.3% of the time and Wednesday flights 84.6%, against 79.2% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.2%
Arrivals under 15 minutes late, of 906 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
1.94%
National rate is 1.89%
Best carrier
Delta
81.5% on time across 780 flights
These figures cover 926 flights between September 2025 and August 2026. Beyond the headline rate, 9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on ATL to MOB
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 | 780 | 81.5% | 70 min | 2.18% | B |
| SkyWest Airlinesthin sample | 146 | 67.6% | 93 min | 0.68% | C+ |
Flight by flight
Flights on ATL to MOB
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 Atlanta to Mobile
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. ATL → GPTAtlanta to Gulfport | Delta Air Lines | 81.2% | 82.5% | 1.59% | 8am–11am, Wed | DL 2718 13:45 |
| 2. ATL → MOBAtlanta to Mobile | Delta Air Lines | 79.7% | 81.5% | 2.18% | 11am–2pm, Sat | DL 2029 23:05 |
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 12 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am49 flights78.7%
- 11am–2pm180 flights85.3%
- 2pm–5pm240 flights73.3%
- 5pm–8pm181 flights78.1%
- 8pm–5am276 flights81.3%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 85.3% on time, ahead of 2pm–5pm at 73.3%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 8pm–5am window is the busiest, with 276 flights scheduled in it.
Explore
Filter ATL to MOB 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 ATL to MOB, the best departure window is 11am–2pm at 85.3% on time and the worst is 2pm–5pm at 73.3%, a wide gap of 12.0 points. All US flights leaving 11am–2pm ran 78.3%.
- 5–8am—
- 8–11am78.7%
- 11am–2pm85.3%
- 2–5pm73.3%
- 5–8pm78.1%
- 8pm–5am81.3%
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 29 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 60.0% on time, 29 points below October, the best at 88.6%. 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. August was the busiest month here, with 116 flights.
Across the week, Wednesday is the strongest day at 84.6% on time and Sunday the weakest at 70.8%, a spread of 14 points.
Delay causes
Why this route gets delayed
Carrier accounts for 51% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Carrier
- 22%Late-arriving aircraft
- 16%National Airspace System
- 10%Extreme weather
- 1%Security
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 7,305 of the 14,000 delay minutes reported here. The split is drawn from 14,303 reported delay minutes.
Cancellations sit at 1.94% against a national 1.89%, which is ordinary. Diversions add another 0.22%.
Connections and stage length
What a delay here actually costs
9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 302 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 11am–2pm window matters as much as it does.
The return leg is a different operation and performs like one: it runs 83.3% on time across 926 flights, 4 points above 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.
One caution: this is a thin sample. 926 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
Work out the risk of missing a connection in MOB after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 926 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 79.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 906 completed flights over 12 months sit behind that.
Common questions
ATL to MOB questions
How often is ATL to MOB 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 20.8% of the 926 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is ATL to MOB compared with the rest of the country?
79.2% of flights arrive on time here against a national 77.3%, a difference of 2 points in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on ATL to MOB?
The 11am–2pm departure window is the strongest at 85.3% on time. The 2pm–5pm window is the weakest at 73.3%, 12 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 ATL to MOB?
July is the weakest month at 60.0% on time, compared with 88.6% in October. Across the year that is 29 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
- MOB to ATL — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Delta Air Lines on ATL to MOB81.5%
- SkyWest Airlines on ATL to MOB67.6%
- ATL to LGA, a related route72.3%
- DFW to MOB, a related route80.8%
- ATL to MCO, a related route70.3%
- Delta Air Lines on-time record81.5%
- SkyWest Airlines on-time record67.6%
- The best time of day to fly, according to 7.05 million flight records
- How often a connection fails at the major US hubs
Direction matters. ATL to MOB and MOB to ATL 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.