Route reliability record
MOB→ATL
Mobile to Atlanta
- Flights
- 926
- Period
- September 2025 to August 2026
- Distance
- 302 mi
- Carriers
- 2
This route lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 926 MOB to ATL flights, with a median arrival 13 minutes early.
Best time to fly MOB to ATL: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 93.3% of the time and Wednesday flights 86.9%, against 83.3% for the route overall.
Set against the rest of the country, this route's record is 6 points better than the US average of 77.3%. That gap is worth roughly 60 fewer late arrivals for every thousand flights.
Key figures
On time
83.3%
Arrivals under 15 minutes late, of 905 completed flights
Avg delay
93 min
Across delayed arrivals only, not all flights
Cancelled
2.05%
National rate is 1.89%
Best carrier
Delta
85.2% on time across 780 flights
These figures cover 926 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 MOB 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 | 780 | 85.2% | 90 min | 2.18% | A |
| SkyWest Airlinesthin sample | 146 | 73.6% | 102 min | 1.37% | C |
Flight by flight
Flights on MOB 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 Mobile 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 23 points, against half a point between the best and worst carrier.
- 5am–8am277 flights93.3%
- 8am–11am49 flights87.2%
- 11am–2pm177 flights86.8%
- 2pm–5pm211 flights70.3%
- 5pm–8pm212 flights79.6%
- 8pm–5am—
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 93.3% of the time, against 70.3% for the afternoon window. That is 23 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 277 flights scheduled in it.
Explore
Filter MOB 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 MOB to ATL, the best departure window is 5am–8am at 93.3% on time and the worst is 2pm–5pm at 70.3%, a wide gap of 23.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am93.3%
- 8–11am87.2%
- 11am–2pm86.8%
- 2–5pm70.3%
- 5–8pm79.6%
- 8pm–5am—
best all US flightsScale 60% to 100%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 14 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 75.0% on time, 14 points below June, the best at 89.2%. 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. August was the busiest month here, with 116 flights.
Across the week, Wednesday is the strongest day at 86.9% on time and Sunday the weakest at 81.2%, a spread of 6 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
- 31%Late-arriving aircraft
- 12%National Airspace System
- 6%Extreme weather
- 1%Security
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 7,202 of the 14,000 delay minutes reported here. The split is drawn from 14,047 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 93.3% on time here.
Cancellations sit at 2.05% against a national 1.89%, which is ordinary. Diversions add another 0.22%.
Connections and stage length
What a delay here actually costs
7.6% 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 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 79.2% on time across 926 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.
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 ATL 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 83.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 905 completed flights over 12 months sit behind that.
Common questions
MOB to ATL questions
How often is MOB to ATL delayed?
About one flight in six arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 16.7% of the 926 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is MOB to ATL compared with the rest of the country?
83.3% of flights arrive on time here against a national 77.3%, a difference of 6 points in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on MOB to ATL?
The 5am–8am departure window is the strongest at 93.3% on time. The 2pm–5pm window is the weakest at 70.3%, 23 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 MOB to ATL?
July is the weakest month at 75.0% on time, compared with 89.2% in June. Across the year that is 14 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 MOB — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Delta Air Lines on MOB to ATL85.2%
- SkyWest Airlines on MOB to ATL73.6%
- MOB to DFW, a related route82.6%
- LGA to ATL, a related route75.5%
- MCO to ATL, a related route74.9%
- Delta Air Lines on-time record85.2%
- SkyWest Airlines on-time record73.6%
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. MOB to ATL and ATL to MOB 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.