Flight number record

DL 751

Delta Air Lines · New York to Denver

Route: LGA → DEN
Departs: 07:30
Flights: 364
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 751, check with Delta Air Lines.

DL 751 lands a B−, 4 points better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 40 minutes on average. That rests on 364 flights, with a median arrival 7 minutes early.

Set against the rest of the country, DL 751's record is 4 points better than the US average of 77.3%. That gap is worth roughly 44 fewer late arrivals for every thousand flights.

On time

81.7%

Arrivals under 15 minutes late, of 350 completed flights

Avg delay

42 min

Across delayed arrivals only, not all flights

Cancelled

3.85%

National rate is 1.89%

1 hour+ late

3.4%

National rate is 8.3%

These figures cover 364 flights between September 2025 and August 2026. The median arrival is 7 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 751 flies

DL 751 flies LGA to DEN without a single fixed slot. Its most common scheduled departure was 07:30, used on 160 of 364 flights, with 07:40 (65 flights) and 07:45 (55 flights) next.

Departs 07:30160 flights44.0%
Departs 07:4065 flights17.9%
Departs 07:4555 flights15.1%

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 07:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 751 runs 8 points worse at 81.7%. 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 751 next to LGA to DEN

Every carrier on LGA to DEN combined arrived on time 70.0% of the time across 4,663 flights, so DL 751 is 12 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 70.7% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.

DL 751 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 751thin sample	364	81.7%	42 min	3.85%	B−
All Delta Air Lines on LGA–DEN	1,033	70.7%	68 min	4.55%	C−
All carriers on LGA–DEN	4,663	70.0%	71 min	3.28%	C−
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 751 quarter by quarter

DL 751 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Apr–Jun 2026 at 76.7%, a swing of 13 points on roughly 73 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 flights90.0%
Oct–Dec 202592 flights82.2%
Jan–Mar 202690 flights85.5%
Apr–Jun 202691 flights76.7%
Jul–Sep 202661 flights78.9%

Scale runs 70% to 95%.

By weekday, DL 751 ranged from 77.8% on Monday to 86.5% on Wednesday. With about 52 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late DL 751 runs when it is late

DL 751 often beats the schedule: 113 of 350 completed flights, 32%, arrived 15 minutes or more early. Most of the lateness is short. 35 of the 64 late arrivals were under half an hour behind, and 12 reached an hour or more.

15+ min early113 flights32.3%
Within 15 min173 flights49.4%
15–29 min late35 flights10.0%
30–59 min late17 flights4.9%
1–2 hours late8 flights2.3%
2+ hours late4 flights1.1%

Scale runs 0% to 100%.

Share of 350 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 22 departures that left 15 minutes late or more, only 1 made it up before arrival. In the other direction, 43 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 DEN.

The worst days

Worst days for DL 751

The latest arrival of the period was on 29 June 2026, 3 hours 52 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.

The latest arrivals of DL 751 in the period
Date	Arrived late by	Largest filed cause
29 June 2026	3 hours 52 minutes	Carrier
4 August 2026	2 hours 18 minutes	National Airspace System
7 August 2026	2 hours 5 minutes	Carrier
2 November 2025	2 hours 3 minutes	Carrier
25 February 2026	1 hour 59 minutes	National Airspace System

Delay causes

Why DL 751 runs late

National Airspace System accounts for 57% of the 2,706 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
57%
Carrier
42%
Late-arriving aircraft
1%

57% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,532 minutes out of 2,706, against a national NAS share of 21%. The split is drawn from 2,706 delay minutes reported on DL 751.

Cancellations run at 3.85%, against 1.89% nationally. That is about one flight in 25 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

Badly late arrivals are rare here: only 3.4% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

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.

DL 751 is not only a LGA to DEN flight. It also flew DEN to LGA (363 flights, 81.0% 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. 364 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.

Other routes flown as DL 751
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
DEN to LGAthin sample	363	81.0%	73 min	4.13%	B−

What to do with this

Booking DL 751

For a booking, the cancellation rate is the figure to plan around on DL 751: 3.85% of its 364 scheduled flights did not operate. A late arrival costs roughly 40 minutes, but a cancellation costs the day, so leave a later option open.

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