Flight number record
UA 404
United Airlines · Houston to Newark
- Route
- IAH → EWR
- Departs
- 18:36
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 404, check with United Airlines.
UA 404 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 365 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so UA 404 runs 11 points behind the country as a whole. Across a thousand flights that is about 107 extra late arrivals.
Key figures
On time
66.6%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
2.74%
National rate is 1.89%
1 hour+ late
12.7%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 12.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 404 flies
UA 404 flies IAH to EWR without a single fixed slot. Its most common scheduled departure was 18:36, used on 80 of 365 flights, with 18:18 (60 flights) and 18:17 (41 flights) next.
- Departs 18:3680 flights21.9%
- Departs 18:1860 flights16.4%
- Departs 18:1741 flights11.2%
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 18:36 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 404 runs level with that at 66.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 404 next to IAH to EWR
Every carrier on IAH to EWR combined arrived on time 75.4% of the time across 3,717 flights, so UA 404 is 9 points behind it. United flew 3,510 flights on the same city pair under all its flight numbers, including this one, and those ran 75.2% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 404 | 365 | 66.6% | 72 min | 2.74% | C |
| All United Airlines on IAH–EWR | 3,510 | 75.2% | 72 min | 1.57% | B |
| All carriers on IAH–EWR | 3,717 | 75.4% | 71 min | 1.86% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 404 quarter by quarter
UA 404 did not run the same all year. Its best quarter was Jan–Mar 2026 at 77.6% on time and its weakest Jul–Sep 2026 at 50.8%, a swing of 27 points on roughly 73 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 flights76.7%
- Oct–Dec 202592 flights58.9%
- Jan–Mar 202690 flights77.6%
- Apr–Jun 202691 flights70.8%
- Jul–Sep 202662 flights50.8%
Scale runs 40% to 85%.
By weekday, UA 404 did best on Tuesday at 80.4% on time and worst on Sunday at 57.4%. Each day rests on about 52 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 404 runs when it is late
The 118 late arrivals split 27 under half an hour, 46 between 30 and 60 minutes, and 45 an hour or more.
- 15+ min early68 flights19.3%
- Within 15 min167 flights47.3%
- 15–29 min late27 flights7.6%
- 30–59 min late46 flights13.0%
- 1–2 hours late26 flights7.4%
- 2+ hours late19 flights5.4%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
17 of 119 late departures made up the time and arrived on time, 14% of them. 16 flights left on time and still arrived late.
The worst days
Worst days for UA 404
The latest arrival of the period was on 27 August 2026, 8 hours 35 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across August, October, November and July, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 August 2026 | 8 hours 35 minutes | Carrier |
| 30 October 2025 | 6 hours 58 minutes | National Airspace System |
| 6 August 2026 | 4 hours 52 minutes | Late-arriving aircraft |
| 8 November 2025 | 3 hours 44 minutes | Late-arriving aircraft |
| 15 July 2026 | 3 hours 35 minutes | National Airspace System |
Delay causes
Why UA 404 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 8,498 reported delay minutes.
- 40%National Airspace System
- 30%Late-arriving aircraft
- 25%Carrier
- 5%Extreme weather
40% 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 3,368 minutes out of 8,498, against a national NAS share of 21%. The split is drawn from 8,498 delay minutes reported on UA 404.
Cancellations run at 2.74%, against 1.89% nationally. That is roughly one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
12.7% 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.
The 1,400 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 three other city pairs in the data, including SAT to IAH (201), SFO to IAH (24) and SLC to IAH (19), but none flew often enough under UA 404 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to EWR only.
One caution: this is a thin sample. 365 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 404
For a booking, the cancellation rate is the figure to plan around on UA 404: 2.74% of its 365 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- IAH to EWR, every carrier and departure
- EWR to IAH, the return direction
- United Airlines 1886 on the same route88.5%
- United Airlines 1444 on the same route76.3%
- United Airlines 1397 on the same route73.2%
- United Airlines 1797 on the same route93.6%
- United Airlines 2608 on the same route59.1%
- United Airlines 700 on the same route63.5%
- George Bush Intercontinental (IAH) delay statistics
- Newark Liberty International (EWR) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
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 ; recomputed monthly. How this data is collected.