Flight number record

UA 2297

United Airlines · Boston to Denver

Route: BOS → DEN
Departs: 15:15
Flights: 364
Period: July 2025 to June 2026

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

UA 2297 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 364 flights, with a median arrival 7 minutes early.

Set against the rest of the country, UA 2297's record is 7 points better than the US average of 77.6%. That gap is worth roughly 67 fewer late arrivals for every thousand flights.

On time

84.3%

Arrivals under 15 minutes late, of 357 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.81%

1 hour+ late

3.9%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 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.

Schedule

When UA 2297 flies

UA 2297 flies BOS to DEN without a single fixed slot. Its most common scheduled departure was 15:15, used on 90 of 364 flights, with 15:25 (50 flights) and 15:10 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:1590 flights24.7%
Departs 15:2550 flights13.7%
Departs 15:1041 flights11.3%

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 15:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 2297 runs 12 points better at 84.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 2297 next to BOS to DEN

Every carrier on BOS to DEN combined arrived on time 76.5% of the time across 3,899 flights, so UA 2297 is 8 points ahead of it. United flew 1,908 flights on the same city pair under all its flight numbers, including this one, and those ran 83.0% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 5 points.

UA 2297 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2297thin sample	364	84.3%	66 min	0.82%	B+
All United Airlines on BOS–DEN	1,908	83.0%	64 min	1.00%	B
All carriers on BOS–DEN	3,899	76.5%	58 min	1.18%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	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 2025 at 71.9%, a swing of 17 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 202592 flights71.9%
Oct–Dec 202591 flights87.9%
Jan–Mar 202690 flights88.5%
Apr–Jun 202691 flights88.9%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, UA 2297 did best on Monday at 92.0% on time and worst on Thursday at 78.0%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 2297 runs late

One category carries most of the weight here. National Airspace System accounts for 49% of the 3,710 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.

National Airspace System
49%
Late-arriving aircraft
35%
Carrier
15%
Extreme weather
1%

35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 3,710 reported delay minutes here, that single category outweighs weather by 35 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 3,710 delay minutes reported on UA 2297.

Cancellations are rare at 0.82%, below the national 1.81% 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 8.1% 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 1,754 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 two other city pairs in the data, including DEN to LAX (29) and 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. 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.

What to do with this

Booking UA 2297

For a booking, read UA 2297 as 84.3% on time with 0.82% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures