Flight profile · United Airlines
UA2098
Boston (BOS) to Washington (IAD) · scheduled 9:30 AM – 11:11 AM
How UA2098 performs
726 operations, March 2024 – July 2026.
UA2098 arrived on time 90.0% of the time, against 83.4% for all BOS → IAD flights, so this departure is 6.6 percentage points better than the route as a whole. Against United Airlines’ own flights on this route it is 6.5 points better.
Source: US DOT Bureau of Transportation Statistics · 726 operations, March 2024 – July 2026 · If UA2098 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where UA2098 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 |
|---|---|---|---|---|---|
| UA2098 | 90.0% | 1.10% | -10 min | 2.2% | 726 |
| United Airlines on BOS → IAD | 83.5% | 1.35% | -9 min | 6.2% | 4,586 |
| All BOS → IAD flights | 83.4% | 1.50% | -9 min | 6.3% | 4,652 |
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – July 2026
Why UA2098 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA2098 on BOS → IAD. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering March 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies UA2098 comes in late, and what that does to the departure.
UA2098 is usually the aircraft’s first flight of the day: the schedule gives it a median of 9.5 hours on the ground at BOS, so its “inbound” is mostly the aircraft’s arrival the evening before.
The aircraft flying UA2098 came in 15 or more minutes late on 24% 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 BOS just before it, using the tail number in the DOT file, 446 of 718 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 |
|---|---|
| UA2098 | 24% |
| 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 UA2098’s aircraft landed 15 or more minutes late is lower than 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 March 2024 – July 2026
From pushback to gate
When it leaves BOS late, does that still matter by the time it reaches IAD?
UA2098 pushes back an average of 1.7 minutes late and reaches the gate at IAD an average of 4.0 minutes early. The 5.7 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 18.2 minutes on the taxiways at BOS, 2.0 minutes shorter than a typical BOS departure in the same hour.
On arrival at IAD, UA2098 spends 5.5 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 2.0 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 28,214 departures from BOS scheduled in the clock hour UA2098 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 UA2098’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – July 2026
The hour it leaves BOS
Part of any flight’s record belongs to the clock rather than to the flight. UA2098 has one departure time, so this is what that time is worth.
On-time arrival rate. 28,214 departures from BOS are scheduled in the 9 AM–10 AM hour over the period, against 440,893 across the whole day.
UA2098 is scheduled out of BOS at 9:30 AM, in the 9 AM–10 AM bank. Departures from BOS in that hour arrive on time 84.9% of the time against 77.2% across the airport’s whole day — the slot alone is worth 7.7 points better before anything about this particular flight is considered.
The two airport figures cover every departure from BOS 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 · March 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes UA2098 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 |
|---|---|---|---|
| EWR→BOS Newark to Boston | March 6, 2025 – September 24, 2025 | 90 | 87.8% |
| IAD→BNA Washington to Nashville | June 26, 2025 – August 18, 2025 | 54 | — |
| SFO→MCI San Francisco to Kansas City | March 9–23, 2025 | 3 | — |
| IAD→DEN Washington to Denver | August 19, 2024 – September 25, 2024 | 38 | — |
| IAD→MCO Washington to Orlando | July 1, 2023 – March 6, 2024 | 249 | 83.2% |
| SFO→DFW San Francisco to Dallas–Fort Worth | July 3, 2023 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route UA2098 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.
14 min late
against a median of 10 min early
Percentiles over 726 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering March 2024 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA1734 | United Airlines | 96.1% | 12 min early | 623 |
| UA2098 this flight | United Airlines | 90.0% | 10 min early | 726 |
| UA721 | United Airlines | 74.0% | 0 min early | 672 |
| UA2136 | United Airlines | 71.5% | 3 min early | 1,088 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. UA2098 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 726 records of UA2098 operating BOS → 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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