Flight profile · Delta Air Lines
DL1601
Atlanta (ATL) to Houston (IAH) · scheduled 10:40 PM – 11:59 PM
How DL1601 performs
1,119 operations, July 2023 – July 2026.
DL1601 arrived on time 71.6% of the time, against 75.4% for all ATL → IAH flights, so this departure is 3.8 percentage points worse than the route as a whole. Against Delta Air Lines’ own flights on this route it is 4.5 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,119 operations, July 2023 – July 2026 · If DL1601 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How DL1601 compares to other flight numbers, not just to itself.
Which day you fly matters unusually much here, a wider weekday spread than 90% of 1,710 comparable flight numbers.
79.7% on time on a typical Tuesday, against 62.6% on a Sunday.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where DL1601 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
Ask for the position of DL1601 right now, if receivers on the ground are hearing it. Nothing is requested until you press the button.
Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL1601 | 71.6% | 2.50% | 0 min | 8.7% | 1,119 |
| Delta Air Lines on ATL → IAH | 76.1% | 1.49% | -2 min | 7.3% | 7,359 |
| All ATL → IAH flights | 75.4% | 1.66% | -3 min | 8.9% | 14,365 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why DL1601 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL1601 on ATL → IAH. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies DL1601 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, DL1601 pushed back an average of 39 minutes late; when it came in on time or early, an average of 7 minutes late.
Each departure is matched to the flight the same aircraft flew into ATL just before it, using the tail number in the DOT file, 1,031 of 1,091 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| DL1601 | 22% | 66% | 16% |
| Network, same turn | 17% | 68% | 9% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often DL1601’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often DL1601 left 15 or more minutes late is about the same as the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
From pushback to gate
When it leaves ATL late, does that still matter by the time it reaches IAH?
DL1601 pushes back an average of 15.8 minutes late and reaches the gate at IAH an average of 11.0 minutes late. The 4.9 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. Its 16.6 minutes on the taxiways at ATL is about what any departure from the airport in that hour spends.
On arrival at IAH, DL1601 spends 10.2 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at IAH spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached IAH. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 72,288 departures from ATL scheduled in the clock hour DL1601 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at IAH (359,471 flights), not just DL1601’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves ATL
Part of any flight’s record belongs to the clock rather than to the flight. DL1601 has one departure time, so this is what that time is worth.
On-time arrival rate. 72,288 departures from ATL are scheduled in the 10 PM–11 PM hour over the period, against 1,012,247 across the whole day.
DL1601 is scheduled out of ATL at 10:40 PM, in the 10 PM–11 PM bank. Departures from ATL in that hour arrive on time 75.3% of the time against 78.7% across the airport’s whole day — the slot alone is worth 3.4 points worse before anything about this particular flight is considered.
The two airport figures cover every departure from ATL to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does DL1601 run worse on particular days?
Tuesday is historically the most reliable day and Sunday the least, a gap of 17.1 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Days with fewer than 120 operations are not scored.
Other routes DL1601 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DTW→CHS Detroit to Charleston | July 1–8, 2023 | 2 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1601 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
52 min late
against a median of 0 min early
Percentiles over 1,119 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1585 | Delta Air Lines | 84.9% | 4 min early | 942 |
| DL1682 | Delta Air Lines | 82.8% | 6 min early | 991 |
| DL1572 | Delta Air Lines | 80.1% | 4 min early | 869 |
| F91403 | Frontier Airlines | 75.4% | 7 min early | 712 |
| DL1223 | Delta Air Lines | 73.6% | 0 min early | 740 |
| DL1601 this flight | Delta Air Lines | 71.6% | 0 min early | 1,119 |
| DL1284 | Delta Air Lines | 71.3% | 0 min early | 998 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. DL1601 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 1,119 records of DL1601 operating ATL → IAH, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed