Flight number record

UA 635

United Airlines · Hartford to Washington

Route: BDL → IAD
Departs: 06:00
Flights: 322
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 635, check with United Airlines.

UA 635 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 322 flights, with a median arrival 10 minutes early.

Set against the rest of the country, UA 635's record is 16 points better than the US average of 77.6%. That gap is worth roughly 163 fewer late arrivals for every thousand flights.

On time

93.9%

Arrivals under 15 minutes late, of 314 completed flights

Avg delay

64 min

Across delayed arrivals only, not all flights

Cancelled

2.48%

National rate is 1.81%

1 hour+ late

1.0%

National rate is 8.1%

These figures cover 322 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 UA 635 flies

UA 635 is scheduled to leave Hartford (BDL) at 06:00 local time and reach Washington (IAD) at 07:23. That slot held for 283 of the 322 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 06:00283 flights87.9%

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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 635 runs 5 points better at 93.9%. 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

UA 635 next to BDL to IAD

Every carrier on BDL to IAD combined arrived on time 85.4% of the time across 1,092 flights, so UA 635 is 9 points ahead of it. United flew 892 flights on the same city pair under all its flight numbers, including this one, and those ran 87.9% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 15 points.

UA 635 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 635thin sample	322	93.9%	64 min	2.48%	A
All United Airlines on BDL–IAD	892	87.9%	68 min	1.57%	A
All carriers on BDL–IAD	1,092	85.4%	70 min	2.38%	A
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 635 quarter by quarter

Quarter by quarter UA 635 held fairly steady: 94.1% in Jul–Sep 2025, 93.4% in Oct–Dec 2025, 90.2% in Jan–Mar 2026 and 97.8% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202553 flights94.1%
Oct–Dec 202592 flights93.4%
Jan–Mar 202686 flights90.2%
Apr–Jun 202691 flights97.8%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 635 did best on Wednesday at 100.0% on time and worst on Sunday at 87.2%. Each day rests on about 46 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 635 runs late

One category carries most of the weight here. Carrier accounts for 51% of the 1,210 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
51%
Late-arriving aircraft
30%
National Airspace System
19%

The largest share of delay minutes, 51%, 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 621 of the 1,210 delay minutes reported here. The split is drawn from 1,210 delay minutes reported on UA 635.

Cancellations sit at 2.48% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 1.0% 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.

The same number turns up on nine other city pairs in the data, including IAD to SFO (73), IAD to ABQ (37) and IAD to RDU (24), but none flew often enough under UA 635 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BDL to IAD only.

One caution: this is a thin sample. 322 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 635

For a booking, read UA 635 as 93.9% on time with 2.48% cancelled over 322 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