Flight number record

UA 755

United Airlines · Washington to Boston

Route: IAD → BOS
Departs: 22:18
Flights: 325
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 755, check with United Airlines.

UA 755 lands a B, 4 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 325 flights, with a median arrival 4 minutes early.

On time

81.1%

Arrivals under 15 minutes late, of 317 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

2.46%

National rate is 1.81%

1 hour+ late

5.7%

National rate is 8.1%

These figures cover 325 flights between July 2025 and June 2026. The median arrival is 4 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 755 flies

UA 755 flies IAD to BOS without a single fixed slot. Its most common scheduled departure was 22:18, used on 81 of 325 flights, with 22:15 (53 flights) and 22:20 (44 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 22:1881 flights24.9%
Departs 22:1553 flights16.3%
Departs 22:2044 flights13.5%

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 22:18 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and UA 755 runs 11 points better at 81.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

UA 755 next to IAD to BOS

Every carrier on IAD to BOS combined arrived on time 77.3% of the time across 1,462 flights, so UA 755 is 4 points ahead of it. United flew 1,459 flights on the same city pair under all its flight numbers, including this one, and those ran 77.4% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 2 points.

UA 755 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 755thin sample	325	81.1%	60 min	2.46%	B
All United Airlines on IAD–BOS	1,459	77.4%	73 min	1.92%	B
All carriers on IAD–BOS	1,462	77.3%	73 min	1.92%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 755 quarter by quarter

UA 755 did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.8% on time and its weakest Oct–Dec 2025 at 74.6%, a swing of 14 points on roughly 81 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 202586 flights78.6%
Oct–Dec 202564 flights74.6%
Jan–Mar 202684 flights80.2%
Apr–Jun 202691 flights88.8%

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

By weekday, UA 755 did best on Saturday at 86.7% on time and worst on Thursday at 72.7%. Each day rests on about 46 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 755 runs late

One category carries most of the weight here. Carrier accounts for 55% of the 3,602 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
55%
National Airspace System
26%
Late-arriving aircraft
17%
Extreme weather
1%

The largest share of delay minutes, 55%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,986 of the 3,602 delay minutes reported here. The split is drawn from 3,602 delay minutes reported on UA 755.

Cancellations sit at 2.46% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

5.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The same number turns up on four other city pairs in the data, including SAN to IAD (167), SFO to IAD (77) and RNO to SFO (53), but none flew often enough under UA 755 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to BOS only.

One caution: this is a thin sample. 325 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 755

For a booking, read UA 755 as 81.1% on time with 2.46% cancelled over 325 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