Flight number record

UA 2297

United Airlines · Boston to Denver

Route: BOS → DEN
Departs: 15:10
Flights: 363
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2297, check with United Airlines.

UA 2297 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 363 flights, with a median arrival 7 minutes early.

Set against the rest of the country, UA 2297's record is 8 points better than the US average of 77.3%. That gap is worth roughly 78 fewer late arrivals for every thousand flights.

On time

85.1%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

0.83%

National rate is 1.89%

1 hour+ late

3.9%

National rate is 8.3%

These figures cover 363 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 UA 2297 flies

UA 2297 flies BOS to DEN without a single fixed slot. Its most common scheduled departure was 15:10, used on 102 of 363 flights, with 15:15 (90 flights) next.

Departs 15:10102 flights28.1%
Departs 15:1590 flights24.8%

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 15:10 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 2297 runs 13 points better at 85.1%. 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 2297 next to BOS to DEN

Every carrier on BOS to DEN combined arrived on time 75.7% of the time across 3,847 flights, so UA 2297 is 9 points ahead of it. United flew 1,884 flights on the same city pair under all its flight numbers, including this one, and those ran 82.5% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 6 points.

UA 2297 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2297thin sample	363	85.1%	63 min	0.83%	A+
All United Airlines on BOS–DEN	1,884	82.5%	70 min	1.11%	B
All carriers on BOS–DEN	3,847	75.7%	62 min	1.38%	B
United Airlines, whole network	830,825	78.8%	73 min	1.02%	B

Across the year

UA 2297 quarter by quarter

UA 2297 did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.9% on time and its weakest Jul–Sep 2026 at 71.9%, a swing of 17 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 flights80.0%
Oct–Dec 202591 flights87.9%
Jan–Mar 202690 flights88.5%
Apr–Jun 202691 flights88.9%
Jul–Sep 202661 flights71.9%

Scale runs 65% to 95%.

By weekday, UA 2297 did best on Monday at 95.9% on time and worst on Saturday at 78.4%. Each day rests on about 52 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late UA 2297 runs when it is late

UA 2297 often beats the schedule: 111 of 355 completed flights, 31%, arrived 15 minutes or more early. Most of the lateness is short. 27 of the 53 late arrivals were under half an hour behind, and 14 reached an hour or more.

15+ min early111 flights31.3%
Within 15 min191 flights53.8%
15–29 min late27 flights7.6%
30–59 min late12 flights3.4%
1–2 hours late7 flights2.0%
2+ hours late7 flights2.0%

Scale runs 0% to 100%.

Share of 355 completed flights by arrival against schedule.

A late pushback is often recovered here: of 32 departures that left 15 minutes late or more, 13 still arrived on time. In the other direction, 34 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 UA 2297

The latest arrival of the period was on 22 October 2025, 6 hours 35 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as national airspace system delay.

The latest arrivals of UA 2297 in the period
Date	Arrived late by	Largest filed cause
22 October 2025	6 hours 35 minutes	Late-arriving aircraft
6 September 2025	6 hours 24 minutes	National Airspace System
28 July 2026	4 hours 26 minutes	National Airspace System
18 September 2025	3 hours 20 minutes	Late-arriving aircraft
17 February 2026	3 hours 10 minutes	National Airspace System

Delay causes

Why UA 2297 runs late

National Airspace System accounts for 62% of the 3,340 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
62%
Late-arriving aircraft
30%
Carrier
7%
Extreme weather
1%

62% 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 2,071 minutes out of 3,340, against a national NAS share of 21%. The split is drawn from 3,340 delay minutes reported on UA 2297.

Cancellations are rare at 0.83%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.9% 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 1,754 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 DEN to PDX (27), but none flew often enough under UA 2297 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to DEN only.

One caution: this is a thin sample. 363 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 2297

For a booking, UA 2297 has one of the better records a US domestic flight can show: 85.1% on time and 0.83% cancelled. That is a base rate, not a promise about any single day.

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