Flight profile · United Airlines
UA2331
Tampa (TPA) to Washington (IAD) · scheduled 9:00 AM – 11:22 AM
How UA2331 performs
901 operations, July 2023 – July 2026.
UA2331 arrived on time 91.5% of the time, against 82.4% for all TPA → IAD flights, so this departure is 9.1 percentage points better than the route as a whole. Against United Airlines’ own flights on this route it is 8.4 points better.
Source: US DOT Bureau of Transportation Statistics · 901 operations, July 2023 – July 2026 · If UA2331 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where UA2331 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 |
|---|---|---|---|---|---|
| UA2331 | 91.5% | 1.00% | -13 min | 2.9% | 901 |
| United Airlines on TPA → IAD | 83.1% | 1.31% | -9 min | 6.9% | 3,590 |
| All TPA → IAD flights | 82.4% | 1.50% | -9 min | 7.2% | 3,940 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why UA2331 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
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 UA2331 on TPA → IAD. 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 UA2331 comes in late, and what that does to the departure.
UA2331 is usually the aircraft’s first flight of the day: the schedule gives it a median of 11 hours on the ground at TPA, so its “inbound” is mostly the aircraft’s arrival the evening before.
The aircraft flying UA2331 came in 15 or more minutes late on 31% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into TPA just before it, using the tail number in the DOT file, 244 of 893 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 |
|---|---|
| UA2331 | 31% |
| Network, same turn | 29% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often UA2331’s aircraft landed 15 or more minutes late is about the same as the network’s. There are not enough departures in both groups to compare how it left.
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 TPA late, does that still matter by the time it reaches IAD?
UA2331 pushes back an average of 1.9 minutes late and reaches the gate at IAD an average of 6.0 minutes early. The 7.9 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. Its 15.5 minutes on the taxiways at TPA is about what any departure from the airport in that hour spends.
On arrival at IAD, UA2331 spends 6.4 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 1.1 minutes shorter than a typical IAD arrival (7.5 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 IAD. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 15,740 departures from TPA scheduled in the clock hour UA2331 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at IAD (169,930 flights), not just UA2331’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves TPA
Part of any flight’s record belongs to the clock rather than to the flight. UA2331 has one departure time, so this is what that time is worth.
On-time arrival rate. 15,740 departures from TPA are scheduled in the 9 AM–10 AM hour over the period, against 242,628 across the whole day.
UA2331 is scheduled out of TPA at 9:00 AM, in the 9 AM–10 AM bank. Departures from TPA in that hour arrive on time 86.4% of the time against 78.2% across the airport’s whole day — the slot alone is worth 8.2 points better before anything about this particular flight is considered.
The two airport figures cover every departure from TPA 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 UA2331 run worse on particular days?
Monday 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 UA2331 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 |
|---|---|---|---|
| IAD→ORD Washington to Chicago | May 23, 2024 – July 31, 2026 | 593 | 80.4% |
| ORD→BOS Chicago to Boston | April 30, 2026 – July 31, 2026 | 92 | 58.9% |
| ORD→MCI Chicago to Kansas City | March 29, 2026 – April 29, 2026 | 32 | — |
| ORD→RSW Chicago to Fort Myers | March 5–28, 2026 | 24 | — |
| ORD→SFO Chicago to San Francisco | January 6, 2026 – February 11, 2026 | 37 | — |
| ORD→PVD Chicago to Providence/Warwick | December 18, 2025 – January 5, 2026 | 19 | — |
| ORD→PDX Chicago to Portland | June 26, 2025 – December 17, 2025 | 52 | — |
| ORD→CID Chicago to Cedar Rapids | September 25, 2025 – October 24, 2025 | 30 | — |
| ORD→LAX Chicago to Los Angeles | May 23, 2024 – September 24, 2025 | 125 | 71.0% |
| ORD→SAN Chicago to San Diego | August 19, 2024 – May 21, 2025 | 165 | 80.0% |
| CVG→IAH Cincinnati / Covington to Houston | October 27, 2024 | 1 | — |
| RDU→ORD Raleigh–Durham to Chicago | November 28, 2023 – January 8, 2024 | 42 | — |
| IAD→RDU Washington to Raleigh–Durham | November 28, 2023 – January 8, 2024 | 30 | — |
| ORD→PHX Chicago to Phoenix | January 8, 2024 | 1 | — |
| RDU→DEN Raleigh–Durham to Denver | September 5–28, 2023 | 24 | — |
| IAD→DEN Washington to Denver | August 1, 2023 – September 4, 2023 | 35 | — |
Because the same number has served different journeys, the statistics above describe only the route UA2331 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.
10 min late
against a median of 13 min early
Percentiles over 901 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 |
|---|---|---|---|---|
| UA2331 this flight | United Airlines | 91.5% | 13 min early | 901 |
| UA1370 | United Airlines | 73.2% | 6 min early | 713 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. UA2331 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 901 records of UA2331 operating TPA → IAD, 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
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