Flight number record
DL 398
Delta Air Lines · Denver to New York
- Route
- DEN → LGA
- Departs
- 07:10
- Flights
- 250
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 398, check with Delta Air Lines.
DL 398 earns an A−. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 250 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 398's record is 10 points better than the US average of 77.3%. That gap is worth roughly 98 fewer late arrivals for every thousand flights.
Key figures
On time
87.1%
Arrivals under 15 minutes late, of 241 completed flights
Avg delay
113 min
Across delayed arrivals only, not all flights
Cancelled
3.20%
National rate is 1.89%
1 hour+ late
6.2%
National rate is 8.3%
These figures cover 250 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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Schedule
When DL 398 flies
DL 398 flies DEN to LGA without a single fixed slot. Its most common scheduled departure was 07:10, used on 90 of 250 flights, with 06:45 (37 flights) and 06:25 (31 flights) next.
- Departs 07:1090 flights36.0%
- Departs 06:4537 flights14.8%
- Departs 06:2531 flights12.4%
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 07:10 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 398 runs 2 points worse at 87.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 398 next to DEN to LGA
Every carrier on DEN to LGA combined arrived on time 71.3% of the time across 4,664 flights, so DL 398 is 16 points ahead of it. Delta flew 1,033 flights on the same city pair under all its flight numbers, including this one, and those ran 79.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 398thin sample | 250 | 87.1% | 113 min | 3.20% | A− |
| All Delta Air Lines on DEN–LGA | 1,033 | 79.7% | 83 min | 4.84% | B− |
| All carriers on DEN–LGA | 4,664 | 71.3% | 70 min | 2.92% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 398 quarter by quarter
DL 398 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jul–Sep 2026 at 78.2%, a swing of 19 points on roughly 63 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 202530 flights96.7%
- Oct–Dec 202580 flights89.9%
- Apr–Jun 202679 flights87.0%
- Jul–Sep 202661 flights78.2%
Scale runs 70% to 100%.
By weekday, DL 398 ranged from 84.8% on Sunday to 94.4% on Monday. With about 36 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 398 runs when it is late
DL 398 often beats the schedule: 108 of 241 completed flights, 45%, arrived 15 minutes or more early. The 31 late arrivals split 10 under half an hour, 6 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early108 flights44.8%
- Within 15 min102 flights42.3%
- 15–29 min late10 flights4.1%
- 30–59 min late6 flights2.5%
- 1–2 hours late7 flights2.9%
- 2+ hours late8 flights3.3%
Scale runs 0% to 100%.
Share of 241 completed flights by arrival against schedule.
4 of 28 late departures made up the time and arrived on time, 14% of them. 7 flights left on time and still arrived late.
The worst days
Worst days for DL 398
The latest arrival of the period was on 5 June 2026, 11 hours 9 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 June 2026 | 11 hours 9 minutes | Carrier |
| 4 August 2026 | 5 hours 27 minutes | Late-arriving aircraft |
| 1 June 2026 | 5 hours 7 minutes | Carrier |
| 3 November 2025 | 4 hours 48 minutes | Carrier |
| 12 May 2026 | 4 hours 24 minutes | Carrier |
Delay causes
Why DL 398 runs late
Carrier accounts for 79% of the 3,488 delay minutes carriers reported here, and the remaining four split what is left.
- 79%Carrier
- 12%National Airspace System
- 9%Late-arriving aircraft
The largest share of delay minutes, 79%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,745 of the 3,488 delay minutes reported here. The split is drawn from 3,488 delay minutes reported on DL 398.
Cancellations run at 3.20%, against 1.89% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
6.2% 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 close to two hours, which a normal layover absorbs.
At 1,620 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on one other city pair in the data, including MCO to DTW (5), but none flew often enough under DL 398 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to LGA only.
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.
What to do with this
Booking DL 398
For a booking, the cancellation rate is the figure to plan around on DL 398: 3.20% of its 250 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- DEN to LGA, every carrier and departure
- LGA to DEN, the return direction
- Delta Air Lines 751 on the same route81.0%
- United Airlines 1579 on the same route68.3%
- United Airlines 2446 on the same route83.4%
- United Airlines 1442 on the same route88.8%
- Delta Air Lines 716 on the same route68.7%
- United Airlines 2168 on the same route66.1%
- Denver International (DEN) delay statistics
- LaGuardia (LGA) 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
- What a cancellation rate actually tells you (and what it hides)
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.