Flight number record

UA 2639

United Airlines · Dallas-Fort Worth to Washington

Route: DFW → IAD
Departs: 07:25
Flights: 292
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2639, check with United Airlines.

UA 2639 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 292 flights, with a median arrival 10 minutes early.

Set against the rest of the country, UA 2639's record is 11 points better than the US average of 77.6%. That gap is worth roughly 106 fewer late arrivals for every thousand flights.

On time

88.2%

Arrivals under 15 minutes late, of 288 completed flights

Avg delay

96 min

Across delayed arrivals only, not all flights

Cancelled

1.37%

National rate is 1.81%

1 hour+ late

4.9%

National rate is 8.1%

These figures cover 292 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 2639 flies

UA 2639 flies DFW to IAD without a single fixed slot. Its most common scheduled departure was 07:25, used on 143 of 292 flights, with 07:30 (52 flights) and 07:20 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:25143 flights49.0%
Departs 07:3052 flights17.8%
Departs 07:2047 flights16.1%

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 07:25 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 2639 runs level with that at 88.2%. 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 2639 next to DFW to IAD

Every carrier on DFW to IAD combined arrived on time 78.2% of the time across 1,928 flights, so UA 2639 is 10 points ahead of it. United flew 915 flights on the same city pair under all its flight numbers, including this one, and those ran 84.4% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 9 points.

UA 2639 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2639thin sample	292	88.2%	96 min	1.37%	A
All United Airlines on DFW–IAD	915	84.4%	93 min	0.98%	B+
All carriers on DFW–IAD	1,928	78.2%	80 min	2.28%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 2639 quarter by quarter

Quarter by quarter UA 2639 held fairly steady: 85.9% in Jul–Sep 2025, 86.1% in Oct–Dec 2025, 94.2% in Jan–Mar 2026 and 86.8% 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 202572 flights85.9%
Oct–Dec 202572 flights86.1%
Jan–Mar 202672 flights94.2%
Apr–Jun 202676 flights86.8%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 2639 did best on Friday at 92.2% on time and worst on Thursday at 80.0%. Each day rests on about 42 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 2639 runs late

One category carries most of the weight here. Carrier accounts for 67% of the 3,261 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
67%
National Airspace System
16%
Extreme weather
9%
Late-arriving aircraft
8%

The largest share of delay minutes, 67%, 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 2,181 of the 3,261 delay minutes reported here. The split is drawn from 3,261 delay minutes reported on UA 2639.

Cancellations sit at 1.37% 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 4.9% 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.

The 1,172 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on three other city pairs in the data, including IAD to FLL (123), LAS to EWR (1) and LAX to IAD (1), but none flew often enough under UA 2639 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DFW to IAD only.

One caution: this is a thin sample. 292 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 2639

For a booking, UA 2639 has one of the better records a US domestic flight can show: 88.2% on time and 1.37% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures