Flight number record
DL 3157
Delta Air Lines · New Orleans to Atlanta
- Route
- MSY → ATL
- Departs
- 15:41
- Flights
- 250
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 3157, check with Delta Air Lines.
DL 3157 lands a B, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 250 flights, with a median arrival 7 minutes early.
Key figures
On time
76.2%
Arrivals under 15 minutes late, of 244 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
1.60%
National rate is 1.89%
1 hour+ late
9.0%
National rate is 8.3%
These figures cover 250 flights between September 2025 and August 2026. Beyond the headline rate, 9.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 3157 flies
DL 3157 flies MSY to ATL without a single fixed slot. Its most common scheduled departure was 15:41, used on 50 of 250 flights, with 15:30 (49 flights) and 15:31 (33 flights) next.
- Departs 15:4150 flights20.0%
- Departs 15:3049 flights19.6%
- Departs 15:3133 flights13.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 15:41 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 3157 runs 4 points better at 76.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 3157 next to MSY to ATL
Every carrier on MSY to ATL combined arrived on time 82.2% of the time across 4,004 flights, so DL 3157 is 6 points behind it. Delta flew 3,278 flights on the same city pair under all its flight numbers, including this one, and those ran 86.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 3157thin sample | 250 | 76.2% | 70 min | 1.60% | B |
| All Delta Air Lines on MSY–ATL | 3,278 | 86.7% | 71 min | 1.49% | A |
| All carriers on MSY–ATL | 4,004 | 82.2% | 68 min | 1.47% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 3157 quarter by quarter
DL 3157 did not run the same all year. Its best quarter was Jan–Mar 2026 at 83.9% on time and its weakest Jul–Sep 2026 at 68.3%, a swing of 16 points on roughly 83 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Oct–Dec 202512 flights—
- Jan–Mar 202690 flights83.9%
- Apr–Jun 202686 flights74.1%
- Jul–Sep 202662 flights68.3%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 3157 did best on Thursday at 82.9% on time and worst on Monday at 67.6%. Each day rests on about 36 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 3157 runs when it is late
DL 3157 often beats the schedule: 69 of 244 completed flights, 28%, arrived 15 minutes or more early. The 58 late arrivals split 19 under half an hour, 17 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early69 flights28.3%
- Within 15 min117 flights48.0%
- 15–29 min late19 flights7.8%
- 30–59 min late17 flights7.0%
- 1–2 hours late11 flights4.5%
- 2+ hours late11 flights4.5%
Scale runs 0% to 100%.
Share of 244 completed flights by arrival against schedule.
7 of 52 late departures made up the time and arrived on time, 13% of them. In the other direction, 13 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ATL.
The worst days
Worst days for DL 3157
The latest arrival of the period was on 6 March 2026, 5 hours 21 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 March 2026 | 5 hours 21 minutes | National Airspace System |
| 11 July 2026 | 4 hours 31 minutes | Carrier |
| 5 July 2026 | 4 hours 5 minutes | National Airspace System |
| 26 April 2026 | 3 hours 50 minutes | Late-arriving aircraft |
| 3 July 2026 | 2 hours 45 minutes | Late-arriving aircraft |
Delay causes
Why DL 3157 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,049 reported delay minutes.
- 41%National Airspace System
- 39%Late-arriving aircraft
- 16%Carrier
- 5%Extreme weather
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,049 reported delay minutes here, that single category outweighs weather by 8 to one. The split is drawn from 4,049 delay minutes reported on DL 3157.
Cancellations sit at 1.60% against a national 1.89%, which is ordinary. Diversions add another 0.80%.
Connections and routes
What a delay on this flight costs
9.0% 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.
DL 3157 is not only a MSY to ATL flight. It also flew ATL to MSY (250 flights, 83.3% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 250 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| ATL to MSYthin sample | 250 | 83.3% | 51 min | 1.60% | B |
What to do with this
Booking DL 3157
For a booking, DL 3157 is one of the weaker ways to fly MSY to ATL: 6 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- MSY to ATL, every carrier and departure
- ATL to MSY, the return direction
- Delta Air Lines 2522 on the same route89.5%
- Delta Air Lines 1534 on the same route91.5%
- Delta Air Lines 2542 on the same route85.7%
- Delta Air Lines 3128 on the same route92.8%
- Delta Air Lines 1547 on the same route90.6%
- Louis Armstrong New Orleans International (MSY) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.