Flight number record

UA 1227

United Airlines · Newark to San Francisco

Route: EWR → SFO
Departs: 14:00
Flights: 328
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1227, check with United Airlines.

UA 1227 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 328 flights, with a median arrival 5 minutes early.

The national on-time rate over the same period is 77.6%, so UA 1227 runs 5 points behind the country as a whole. Across a thousand flights that is about 46 extra late arrivals.

On time

73.0%

Arrivals under 15 minutes late, of 318 completed flights

Avg delay

98 min

Across delayed arrivals only, not all flights

Cancelled

2.44%

National rate is 1.81%

1 hour+ late

12.6%

National rate is 8.1%

These figures cover 328 flights between July 2025 and June 2026. Beyond the headline rate, 12.6% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When UA 1227 flies

UA 1227 flies EWR to SFO without a single fixed slot. Its most common scheduled departure was 14:00, used on 154 of 328 flights, with 13:30 (58 flights) and 13:25 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:00154 flights47.0%
Departs 13:3058 flights17.7%
Departs 13:2549 flights14.9%

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 14:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 1227 runs level with that at 73.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1227 next to EWR to SFO

Every carrier on EWR to SFO combined arrived on time 69.8% of the time across 4,403 flights, so UA 1227 is 3 points ahead of it. United flew 3,793 flights on the same city pair under all its flight numbers, including this one, and those ran 68.9% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 6 points.

UA 1227 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1227thin sample	328	73.0%	98 min	2.44%	C
All United Airlines on EWR–SFO	3,793	68.9%	92 min	2.53%	C
All carriers on EWR–SFO	4,403	69.8%	89 min	2.32%	C
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1227 quarter by quarter

UA 1227 did not run the same all year. Its best quarter was Jul–Sep 2025 at 88.0% on time and its weakest Apr–Jun 2026 at 66.3%, a swing of 22 points on roughly 82 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 202555 flights88.0%
Oct–Dec 202592 flights70.7%
Jan–Mar 202690 flights73.6%
Apr–Jun 202691 flights66.3%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1227 did best on Tuesday at 83.0% on time and worst on Monday at 65.9%. Each day rests on about 47 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1227 runs late

One category carries most of the weight here. Carrier accounts for 42% of the 8,457 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
42%
National Airspace System
39%
Late-arriving aircraft
19%
Extreme weather
1%

39% 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 3,257 minutes out of 8,457, against a national NAS share of 21%. The split is drawn from 8,457 delay minutes reported on UA 1227.

Cancellations sit at 2.44% against a national 1.81%, which is ordinary. Diversions add another 0.61%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.6% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

At 2,565 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 five other city pairs in the data, including MCO to EWR (188), SFO to PHX (49) and RDU to EWR (48), but none flew often enough under UA 1227 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to EWR to SFO only.

One caution: this is a thin sample. 328 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 1227

For a booking, UA 1227 is a flight to put a long connection behind. 12.6% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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