Flight profile · United Airlines
UA2379
Seattle (SEA) to Houston (IAH) · scheduled 11:59 PM – 6:14 AM
How UA2379 performs
873 operations, July 2023 – July 2026.
UA2379 arrived on time 81.7% of the time, against 79.4% for all SEA → IAH flights, so this departure is 2.3 percentage points better than the route as a whole. Against United Airlines’ own flights on this route it is 1.6 points worse.
Source: US DOT Bureau of Transportation Statistics · 873 operations, July 2023 – July 2026 · If UA2379 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where UA2379 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| UA2379 | 81.7% | 1.72% | -6 min | 4.3% | 873 |
| United Airlines on SEA → IAH | 83.3% | 1.21% | -7 min | 5.1% | 3,807 |
| All SEA → IAH flights | 79.4% | 1.21% | -5 min | 4.7% | 6,529 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why UA2379 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA2379 on SEA → IAH. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies UA2379 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, UA2379 pushed back an average of 38 minutes late; when it came in on time or early, an average of 3 minutes late.
Each departure is matched to the flight the same aircraft flew into SEA just before it, using the tail number in the DOT file, 854 of 859 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| UA2379 | 29% | 70% | 8% |
| Network, same turn | 17% | 68% | 9% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often UA2379’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often UA2379 left 15 or more minutes late is about the same as the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
From pushback to gate
When it leaves SEA late, does that still matter by the time it reaches IAH?
UA2379 pushes back an average of 13.9 minutes late and reaches the gate at IAH an average of 2.5 minutes late. The 11.3 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 17.4 minutes on the taxiways at SEA, 1.2 minutes shorter than a typical SEA departure in the same hour.
On arrival at IAH, UA2379 spends 7.0 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 3.6 minutes shorter than a typical IAH arrival (10.7 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached IAH. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 20,487 departures from SEA scheduled in the clock hour UA2379 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at IAH (359,471 flights), not just UA2379’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves SEA
Part of any flight’s record belongs to the clock rather than to the flight. UA2379 has one departure time, so this is what that time is worth.
On-time arrival rate. 20,487 departures from SEA are scheduled in the 11 PM–12 AM hour over the period, against 510,205 across the whole day.
UA2379 is scheduled out of SEA at 11:59 PM, in the 11 PM–12 AM bank. Departures from SEA in that hour arrive on time 80.4% of the time against 79.1% across the airport’s whole day, so the hour UA2379 leaves in is an ordinary one for SEA and explains nothing about its record either way.
The two airport figures cover every departure from SEA to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does UA2379 run worse on particular days?
Thursday is historically the most reliable day and Saturday the least, a gap of 6.8 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Days with fewer than 120 operations are not scored.
Other routes UA2379 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| RSW→ORD Fort Myers to Chicago | March 29, 2026 – April 29, 2026 | 32 | — |
| JAX→ORD Jacksonville to Chicago | March 5–28, 2026 | 24 | — |
| MAF→IAH Midland to Houston | February 12, 2026 – March 4, 2026 | 18 | — |
| IAH→MFE Houston to McAllen | January 6, 2026 – February 11, 2026 | 37 | — |
| IAH→SFO Houston to San Francisco | February 13, 2025 – March 5, 2025 | 21 | — |
| MSY→DEN New Orleans to Denver | January 7, 2025 – February 12, 2025 | 37 | — |
| ORD→SEA Chicago to Seattle | June 27, 2024 – August 18, 2024 | 52 | — |
| OMA→IAH Omaha to Houston | February 15, 2024 – March 6, 2024 | 21 | — |
| MIA→EWR Miami to Newark | January 9, 2024 – February 14, 2024 | 37 | — |
Because the same number has served different journeys, the statistics above describe only the route UA2379 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
33 min late
against a median of 6 min early
Percentiles over 873 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA2379 this flight | United Airlines | 81.7% | 6 min early | 873 |
| AS438 | Alaska Airlines | 71.0% | 1 min late | 1,121 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. UA2379 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 873 records of UA2379 operating SEA → IAH, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed