Flight number record

UA 2739

United Airlines · Washington to Atlanta

Route: IAD → ATL
Departs: 08:15
Flights: 289
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2739, check with United Airlines.

UA 2739 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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 289 flights, with a median arrival 14 minutes early.

Set against the rest of the country, UA 2739's record is 12 points better than the US average of 77.3%. That gap is worth roughly 119 fewer late arrivals for every thousand flights.

On time

89.2%

Arrivals under 15 minutes late, of 288 completed flights

Avg delay

74 min

Across delayed arrivals only, not all flights

Cancelled

0.35%

National rate is 1.89%

1 hour+ late

3.8%

National rate is 8.3%

These figures cover 289 flights between September 2025 and August 2026. The median arrival is 14 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 2739 flies

UA 2739 flies IAD to ATL without a single fixed slot. Its most common scheduled departure was 08:15, used on 125 of 289 flights, with 08:20 (39 flights) and 08:16 (35 flights) next.

Departs 08:15125 flights43.3%
Departs 08:2039 flights13.5%
Departs 08:1635 flights12.1%

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 08:15 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 2739 runs 5 points better at 89.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

UA 2739 next to IAD to ATL

Every carrier on IAD to ATL combined arrived on time 78.0% of the time across 4,003 flights, so UA 2739 is 11 points ahead of it. United flew 1,090 flights on the same city pair under all its flight numbers, including this one, and those ran 79.9% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 10 points.

UA 2739 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2739thin sample	289	89.2%	74 min	0.35%	A+
All United Airlines on IAD–ATL	1,090	79.9%	78 min	0.73%	B+
All carriers on IAD–ATL	4,003	78.0%	86 min	2.32%	B
United Airlines, whole network	830,825	78.8%	73 min	1.02%	B

Across the year

UA 2739 quarter by quarter

UA 2739 did not run the same all year. Its best quarter was Apr–Jun 2026 at 95.2% on time and its weakest Oct–Dec 2025 at 84.7%, a swing of 11 points on roughly 58 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 flights90.0%
Oct–Dec 202585 flights84.7%
Jan–Mar 202668 flights91.0%
Apr–Jun 202663 flights95.2%
Jul–Sep 202643 flights86.0%

Scale runs 75% to 100%.

By weekday, UA 2739 did best on Thursday at 97.5% on time and worst on Tuesday at 78.9%. Each day rests on about 41 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late UA 2739 runs when it is late

UA 2739 often beats the schedule: 140 of 288 completed flights, 49%, arrived 15 minutes or more early. The 31 late arrivals split 13 under half an hour, 7 between 30 and 60 minutes, and 11 an hour or more.

15+ min early140 flights48.6%
Within 15 min117 flights40.6%
15–29 min late13 flights4.5%
30–59 min late7 flights2.4%
1–2 hours late4 flights1.4%
2+ hours late7 flights2.4%

Scale runs 0% to 100%.

Share of 288 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 21 departures that left 15 minutes late or more, only 2 made it up before arrival. 12 flights left on time and still arrived late.

The worst days

Worst days for UA 2739

The latest arrival of the period was on 16 March 2026, 4 hours 55 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of UA 2739 in the period
Date	Arrived late by	Largest filed cause
16 March 2026	4 hours 55 minutes	National Airspace System
1 September 2025	3 hours 59 minutes	Late-arriving aircraft
29 October 2025	3 hours 55 minutes	Late-arriving aircraft
28 October 2025	3 hours 34 minutes	Late-arriving aircraft
7 December 2025	2 hours 53 minutes	National Airspace System

Delay causes

Why UA 2739 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,288 reported delay minutes.

National Airspace System
38%
Carrier
32%
Late-arriving aircraft
30%

38% 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 874 minutes out of 2,288, against a national NAS share of 21%. The split is drawn from 2,288 delay minutes reported on UA 2739.

Cancellations are rare at 0.35%, 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 3.8% 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.

The 534 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.

The same number turns up on five other city pairs in the data, including SLC to SFO (1), LAX to LAS (1) and IAH to BOS (1), but none flew often enough under UA 2739 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to ATL only.

One caution: this is a thin sample. 289 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 2739

For a booking, UA 2739 has one of the better records a US domestic flight can show: 89.2% on time and 0.35% 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