Flight number record

DL 751

Delta Air Lines · New York to Denver

Route: LGA → DEN
Departs: 07:30
Flights: 364
Period: July 2025 to June 2026

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

DL 751 lands a B−, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 364 flights, with a median arrival 10 minutes early.

Set against the rest of the country, DL 751's record is 6 points better than the US average of 77.6%. That gap is worth roughly 62 fewer late arrivals for every thousand flights.

On time

83.8%

Arrivals under 15 minutes late, of 352 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

3.30%

National rate is 1.81%

1 hour+ late

3.4%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. The median arrival is 10 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.

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 159 of 364 flights, with 07:25 (96 flights) and 07:40 (65 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:30159 flights43.7%
Departs 07:2596 flights26.4%
Departs 07:4065 flights17.9%

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 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 6 points worse at 83.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 751 next to LGA to DEN

Every carrier on LGA to DEN combined arrived on time 70.7% of the time across 4,672 flights, so DL 751 is 13 points ahead of it. Delta flew 1,036 flights on the same city pair under all its flight numbers, including this one, and those ran 71.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 2 points.

DL 751 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 751thin sample	364	83.8%	54 min	3.30%	B−
All Delta Air Lines on LGA–DEN	1,036	71.3%	71 min	4.15%	C−
All carriers on LGA–DEN	4,672	70.7%	69 min	2.93%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 91.0% on time and its weakest Apr–Jun 2026 at 76.7%, a swing of 14 points on roughly 91 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 202591 flights91.0%
Oct–Dec 202592 flights82.2%
Jan–Mar 202690 flights85.5%
Apr–Jun 202691 flights76.7%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 751 ranged from 80.0% on Sunday to 88.5% 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.

Delay causes

Why DL 751 runs late

One category carries most of the weight here. Carrier accounts for 54% of the 3,062 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.

Carrier
54%
National Airspace System
38%
Late-arriving aircraft
8%

38% 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 1,161 minutes out of 3,062, against a national NAS share of 21%. The split is drawn from 3,062 delay minutes reported on DL 751.

Cancellations run at 3.30%, against 1.81% 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

Badly late arrivals are rare here: only 3.4% land an hour or more behind schedule, against 8.1% 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, 79.5% 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	79.5%	73 min	3.58%	B−

What to do with this

Booking DL 751

For a booking, the cancellation rate is the figure to plan around on DL 751: 3.30% of its 364 scheduled flights did not operate. A late arrival costs roughly 55 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures