Flight number record

DL 3178

Delta Air Lines · Atlanta to Gulfport

Route: ATL → GPT
Departs: 21:52
Flights: 255
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 3178, check with Delta Air Lines.

DL 3178 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 255 flights, with a median arrival 7 minutes early.

On time

79.6%

Arrivals under 15 minutes late, of 250 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

1.57%

National rate is 1.89%

1 hour+ late

9.6%

National rate is 8.3%

These figures cover 255 flights between September 2025 and August 2026. Beyond the headline rate, 9.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When DL 3178 flies

DL 3178 flies ATL to GPT without a single fixed slot. Its most common scheduled departure was 21:52, used on 68 of 255 flights, with 21:35 (38 flights) and 21:51 (36 flights) next.

Departs 21:5268 flights26.7%
Departs 21:3538 flights14.9%
Departs 21:5136 flights14.1%

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 21:52 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 3178 runs 10 points better at 79.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

DL 3178 next to ATL to GPT

Every carrier on ATL to GPT combined arrived on time 82.5% of the time across 1,322 flights, so DL 3178 is 3 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 2 points.

DL 3178 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 3178thin sample	255	79.6%	71 min	1.57%	B
All Delta Air Lines on ATL–GPT	1,322	82.5%	66 min	1.59%	B
All carriers on ATL–GPT	1,322	82.5%	66 min	1.59%	B
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 3178 quarter by quarter

DL 3178 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.2% on time and its weakest Jul–Sep 2026 at 70.5%, a swing of 12 points on roughly 85 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 flights81.8%
Apr–Jun 202691 flights82.2%
Jul–Sep 202662 flights70.5%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 3178 did best on Tuesday at 91.7% on time and worst on Thursday at 64.7%. Each day rests on about 36 flights, so a gap of 27 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 3178 runs when it is late

DL 3178 often beats the schedule: 73 of 250 completed flights, 29%, arrived 15 minutes or more early. The 51 late arrivals split 13 under half an hour, 14 between 30 and 60 minutes, and 24 an hour or more.

15+ min early73 flights29.2%
Within 15 min126 flights50.4%
15–29 min late13 flights5.2%
30–59 min late14 flights5.6%
1–2 hours late16 flights6.4%
2+ hours late8 flights3.2%

Scale runs 0% to 100%.

Share of 250 completed flights by arrival against schedule.

9 of 58 late departures made up the time and arrived on time, 16% of them. Only 2 left on time and still arrived late.

The worst days

Worst days for DL 3178

The latest arrival of the period was on 6 March 2026, 5 hours 3 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across March, July, June and January, with no single month standing out.

The latest arrivals of DL 3178 in the period
Date	Arrived late by	Largest filed cause
6 March 2026	5 hours 3 minutes	Extreme weather
11 July 2026	3 hours 33 minutes	Late-arriving aircraft
18 June 2026	3 hours 25 minutes	Extreme weather
26 January 2026	2 hours 42 minutes	Carrier
10 July 2026	2 hours 30 minutes	Carrier

Delay causes

Why DL 3178 runs late

Carrier accounts for 50% of the 3,621 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
50%
Late-arriving aircraft
33%
National Airspace System
9%
Extreme weather
8%

The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,802 of the 3,621 delay minutes reported here. The split is drawn from 3,621 delay minutes reported on DL 3178.

Cancellations sit at 1.57% against a national 1.89%, which is ordinary. Diversions add another 0.39%.

Connections and routes

What a delay on this flight costs

9.6% 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.

The same number turns up on two other city pairs in the data, including ATL to MYR (95) and MYR to ATL (95), but none flew often enough under DL 3178 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to GPT only.

One caution: this is a thin sample. 255 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.

What to do with this

Booking DL 3178

For a booking, read DL 3178 as 79.6% on time with 1.57% cancelled over 255 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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 22 October 2026; recomputed monthly. How this data is collected.

Key figures