Flight number record

UA 1227

United Airlines · Newark to San Francisco

Route: EWR → SFO
Departs: 14:00
Flights: 341
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 341 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.3%, so UA 1227 runs 8 points behind the country as a whole. Across a thousand flights that is about 80 extra late arrivals.

On time

69.3%

Arrivals under 15 minutes late, of 335 completed flights

Avg delay

99 min

Across delayed arrivals only, not all flights

Cancelled

1.47%

National rate is 1.89%

1 hour+ late

14.3%

National rate is 8.3%

These figures cover 341 flights between September 2025 and August 2026. Beyond the headline rate, 14.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

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 341 flights, with 13:30 (89 flights) and 13:20 (66 flights) next.

Departs 14:00154 flights45.2%
Departs 13:3089 flights26.1%
Departs 13:2066 flights19.4%

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 14:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 1227 runs 3 points worse at 69.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

UA 1227 next to EWR to SFO

Every carrier on EWR to SFO combined arrived on time 67.9% of the time across 4,349 flights, so UA 1227 is about level with it. United flew 3,863 flights on the same city pair under all its flight numbers, including this one, and those ran 66.7% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 10 points.

UA 1227 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1227thin sample	341	69.3%	99 min	1.47%	C
All United Airlines on EWR–SFO	3,863	66.7%	90 min	2.43%	C
All carriers on EWR–SFO	4,349	67.9%	88 min	2.30%	C
United Airlines, whole network	830,825	78.8%	73 min	1.02%	B

Across the year

UA 1227 quarter by quarter

Quarter by quarter UA 1227 held fairly steady: 70.7% in Oct–Dec 2025, 73.6% in Jan–Mar 2026, 66.3% in Apr–Jun 2026 and 63.9% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 20256 flights—
Oct–Dec 202592 flights70.7%
Jan–Mar 202690 flights73.6%
Apr–Jun 202691 flights66.3%
Jul–Sep 202662 flights63.9%

Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1227 did best on Tuesday at 78.7% on time and worst on Monday at 61.7%. Each day rests on about 49 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late UA 1227 runs when it is late

UA 1227 often beats the schedule: 100 of 335 completed flights, 30%, arrived 15 minutes or more early. The 103 late arrivals split 25 under half an hour, 30 between 30 and 60 minutes, and 48 an hour or more.

15+ min early100 flights29.9%
Within 15 min132 flights39.4%
15–29 min late25 flights7.5%
30–59 min late30 flights9.0%
1–2 hours late17 flights5.1%
2+ hours late31 flights9.3%

Scale runs 0% to 100%.

Share of 335 completed flights by arrival against schedule.

17 of 94 late departures made up the time and arrived on time, 18% of them. In the other direction, 26 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SFO.

The worst days

Worst days for UA 1227

The latest arrival of the period was on 2 August 2026, 10 hours 2 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.

The latest arrivals of UA 1227 in the period
Date	Arrived late by	Largest filed cause
2 August 2026	10 hours 2 minutes	Carrier
20 April 2026	6 hours 17 minutes	Carrier
6 October 2025	5 hours 57 minutes	Carrier
4 May 2026	5 hours 10 minutes	Late-arriving aircraft
12 April 2026	5 hours 5 minutes	Carrier

Delay causes

Why UA 1227 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 10,000 reported delay minutes.

Carrier
41%
National Airspace System
38%
Late-arriving aircraft
19%
Extreme weather
2%

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 3,938 minutes out of 10,000, against a national NAS share of 21%. The split is drawn from 10,243 delay minutes reported on UA 1227.

Cancellations sit at 1.47% against a national 1.89%, which is ordinary. Diversions add another 0.29%.

Connections and routes

What a delay on this flight costs

14.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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 four other city pairs in the data, including MCO to EWR (201), RDU to EWR (48) and SFO to TUS (30), 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. 341 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. 14.3% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures