Flight number record
DL 1174
Delta Air Lines · Atlanta to Philadelphia
- Route
- ATL → PHL
- Departs
- 20:15
- Flights
- 253
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1174, check with Delta Air Lines.
DL 1174 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 253 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.6%, so DL 1174 runs 6 points behind the country as a whole. Across a thousand flights that is about 64 extra late arrivals.
Key figures
On time
71.2%
Arrivals under 15 minutes late, of 250 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
1.19%
National rate is 1.81%
1 hour+ late
8.8%
National rate is 8.1%
These figures cover 253 flights between July 2025 and June 2026. Beyond the headline rate, 8.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When DL 1174 flies
DL 1174 flies ATL to PHL without a single fixed slot. Its most common scheduled departure was 20:15, used on 64 of 253 flights, with 20:18 (30 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 20:1564 flights25.3%
- Departs 20:1830 flights11.9%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 20:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 1174 runs level with that at 71.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
DL 1174 next to ATL to PHL
Every carrier on ATL to PHL combined arrived on time 74.9% of the time across 5,713 flights, so DL 1174 is 4 points behind it. Delta flew 3,028 flights on the same city pair under all its flight numbers, including this one, and those ran 76.1% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1174thin sample | 253 | 71.2% | 56 min | 1.19% | C |
| All Delta Air Lines on ATL–PHL | 3,028 | 76.1% | 52 min | 2.48% | B |
| All carriers on ATL–PHL | 5,713 | 74.9% | 72 min | 2.84% | C |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 1174 quarter by quarter
DL 1174 did not run the same all year. Its best quarter was Oct–Dec 2025 at 80.7% on time and its weakest Jul–Sep 2025 at 60.4%, a swing of 20 points on roughly 84 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.
- Jul–Sep 202592 flights60.4%
- Oct–Dec 202590 flights80.7%
- Jan–Mar 202618 flights—
- Apr–Jun 202653 flights79.2%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1174 did best on Wednesday at 80.0% on time and worst on Thursday at 60.5%. Each day rests on about 36 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 1174 runs late
One category carries most of the weight here. Carrier accounts for 51% of the 4,036 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 51%Carrier
- 26%Late-arriving aircraft
- 20%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,055 of the 4,036 delay minutes reported here. The split is drawn from 4,036 delay minutes reported on DL 1174.
Cancellations sit at 1.19% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
8.8% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 666 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on four other city pairs in the data, including DAL to ATL (30), CHO to ATL (23) and ATL to ILM (7), but none flew often enough under DL 1174 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to PHL only.
One caution: this is a thin sample. 253 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 1174
For a booking, read DL 1174 as 71.2% on time with 1.19% cancelled over 253 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to PHL, every carrier and departure
- PHL to ATL, the return direction
- Delta Air Lines 2642 on the same route76.9%
- Delta Air Lines 2270 on the same route86.2%
- Delta Air Lines 1169 on the same route71.3%
- Delta Air Lines 2065 on the same route63.4%
- Frontier Airlines 3210 on the same route75.6%
- Frontier Airlines 2298 on the same route64.6%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Philadelphia International (PHL) 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
- Connecting flights: how much buffer the data says you need
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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.