Flight number record

UA 2664

United Airlines · San Francisco to Baltimore

Route: SFO → BWI
Departs: 09:09
Flights: 346
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2664, check with United Airlines.

UA 2664 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 77.6%. When something does go wrong the average delay runs about 50 minutes. That rests on 346 flights, with a median arrival 9 minutes early.

Set against the rest of the country, UA 2664's record is 12 points better than the US average of 77.6%. That gap is worth roughly 117 fewer late arrivals for every thousand flights.

On time

89.3%

Arrivals under 15 minutes late, of 338 completed flights

Avg delay

50 min

Across delayed arrivals only, not all flights

Cancelled

0.58%

National rate is 1.81%

1 hour+ late

2.7%

National rate is 8.1%

These figures cover 346 flights between July 2025 and June 2026. The median arrival is 9 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 2664 flies

UA 2664 flies SFO to BWI without a single fixed slot. Its most common scheduled departure was 09:09, used on 81 of 346 flights, with 09:10 (63 flights) and 09:25 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:0981 flights23.4%
Departs 09:1063 flights18.2%
Departs 09:2549 flights14.2%

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 09:09 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and UA 2664 runs 5 points better at 89.3%. 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 2664 next to SFO to BWI

Every carrier on SFO to BWI combined arrived on time 81.0% of the time across 1,085 flights, so UA 2664 is 8 points ahead of it. United flew 720 flights on the same city pair under all its flight numbers, including this one, and those ran 88.7% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 10 points.

UA 2664 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2664thin sample	346	89.3%	50 min	0.58%	A+
All United Airlines on SFO–BWI	720	88.7%	49 min	0.42%	A+
All carriers on SFO–BWI	1,085	81.0%	48 min	0.55%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 2664 quarter by quarter

UA 2664 did not run the same all year. Its best quarter was Apr–Jun 2026 at 95.6% on time and its weakest Jul–Sep 2025 at 74.4%, a swing of 21 points on roughly 87 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 flights74.4%
Oct–Dec 202578 flights94.9%
Jan–Mar 202685 flights92.8%
Apr–Jun 202691 flights95.6%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 2664 did best on Thursday at 97.9% on time and worst on Friday at 81.2%. Each day rests on about 49 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 2664 runs late

One category carries most of the weight here. Carrier accounts for 46% of the 1,814 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
46%
Late-arriving aircraft
38%
National Airspace System
15%
Extreme weather
1%

38% 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 1,814 reported delay minutes here, that single category outweighs weather by 38 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 1,814 delay minutes reported on UA 2664.

Cancellations are rare at 0.58%, 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 2.7% 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 2,457 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 DTW to SFO (20) and FLL to DEN (19), but none flew often enough under UA 2664 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to BWI only.

One caution: this is a thin sample. 346 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 2664

For a booking, UA 2664 has one of the better records a US domestic flight can show: 89.3% on time and 0.58% 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