Flight number record

UA 598

United Airlines · Denver to New York

Route: DEN → LGA
Departs: 11:30
Flights: 258
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s UA 598, check with United Airlines.

UA 598 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 258 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.3%, so UA 598 runs 9 points behind the country as a whole. Across a thousand flights that is about 92 extra late arrivals.

On time

68.1%

Arrivals under 15 minutes late, of 248 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

2.71%

National rate is 1.89%

1 hour+ late

12.1%

National rate is 8.3%

These figures cover 258 flights between September 2025 and August 2026. Beyond the headline rate, 12.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When UA 598 flies

UA 598 flies DEN to LGA without a single fixed slot. Its most common scheduled departure was 11:30, used on 109 of 258 flights, with 11:40 (57 flights) and 11:41 (32 flights) next.

Departs 11:30109 flights42.2%
Departs 11:4057 flights22.1%
Departs 11:4132 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 11:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 598 runs 10 points worse at 68.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

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Against the route

UA 598 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 UA 598 is 3 points behind it. United flew 2,021 flights on the same city pair under all its flight numbers, including this one, and those ran 73.5% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 11 points.

UA 598 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 598thin sample	258	68.1%	66 min	2.71%	C
All United Airlines on DEN–LGA	2,021	73.5%	74 min	1.78%	C
All carriers on DEN–LGA	4,664	71.3%	70 min	2.92%	C
United Airlines, whole network	830,825	78.8%	73 min	1.02%	B

Across the year

UA 598 quarter by quarter

UA 598 did not run the same all year. Its best quarter was Apr–Jun 2026 at 72.4% on time and its weakest Jan–Mar 2026 at 61.9%, a swing of 11 points on roughly 65 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 20256 flights—
Oct–Dec 202576 flights66.7%
Jan–Mar 202645 flights61.9%
Apr–Jun 202678 flights72.4%
Jul–Sep 202653 flights65.4%

Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, UA 598 did best on Friday at 76.2% on time and worst on Monday at 61.0%. Each day rests on about 37 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late UA 598 runs when it is late

The 79 late arrivals split 17 under half an hour, 32 between 30 and 60 minutes, and 30 an hour or more.

15+ min early58 flights23.4%
Within 15 min111 flights44.8%
15–29 min late17 flights6.9%
30–59 min late32 flights12.9%
1–2 hours late18 flights7.3%
2+ hours late12 flights4.8%

Scale runs 0% to 100%.

Share of 248 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 64 departures that left 15 minutes late or more, only 7 made it up before arrival. In the other direction, 22 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 LGA.

The worst days

Worst days for UA 598

The latest arrival of the period was on 21 July 2026, 8 hours 24 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on five of the five worst days.

The latest arrivals of UA 598 in the period
Date	Arrived late by	Largest filed cause
21 July 2026	8 hours 24 minutes	National Airspace System
27 August 2026	4 hours 12 minutes	National Airspace System
9 November 2025	2 hours 48 minutes	National Airspace System
20 August 2026	2 hours 45 minutes	National Airspace System
30 March 2026	2 hours 25 minutes	National Airspace System

Delay causes

Why UA 598 runs late

National Airspace System accounts for 77% of the 5,215 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
77%
Late-arriving aircraft
15%
Carrier
8%
Extreme weather
1%

77% 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 3,995 minutes out of 5,215, against a national NAS share of 21%. The split is drawn from 5,215 delay minutes reported on UA 598.

Cancellations run at 2.71%, against 1.89% nationally. That is about one flight in 40 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

12.1% 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.

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 eleven other city pairs in the data, including LGA to ORD (64), BDL to DEN (37) and EWR to SAV (23), but none flew often enough under UA 598 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. 258 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 UA 598

For a booking, the cancellation rate is the figure to plan around on UA 598: 2.71% of its 258 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.

Where to go next

A flight number here means United Airlines’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