Flight profile · United Airlines
UA2099
Chicago (ORD) to Seattle (SEA) · scheduled 8:45 AM – 11:38 AM
How UA2099 performs
155 operations, 2026-01-06 to 2026-06-30.
UA2099 arrived on time 81.9% of the time, against 74.3% for all ORD → SEA flights — this specific departure is 7.6 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 2.9 points better.
Source: US DOT Bureau of Transportation Statistics · 155 operations between 2026-01-06 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA2099 | 81.9% | 0.00% | -4 min | 3.9% | 155 |
| United Airlines on ORD → SEA | 79.0% | 0.69% | -7 min | 6.4% | 4,612 |
| All ORD → SEA flights | 74.3% | 0.98% | -4 min | 7.8% | 15,703 |
Source: FlyerIntel analysis of US DOT BTS data · 2026-01-06 to 2026-06-30
Other routes UA2099 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 |
|---|---|---|---|
| GRR→ORD Grand Rapids to Chicago | 2024-05-23 – 2026-06-25 | 680 | 78.9% |
| ORD→IAH Chicago to Houston | 2025-06-26 – 2026-03-04 | 75 | — |
| ORD→SFO Chicago to San Francisco | 2023-07-01 – 2026-01-05 | 93 | 76.1% |
| SFO→LAS San Francisco to Las Vegas | 2025-12-18 – 2026-01-05 | 19 | — |
| ORD→DCA Chicago to Washington | 2025-01-18 – 2025-10-24 | 88 | — |
| ORD→JAX Chicago to Jacksonville | 2025-03-06 – 2025-03-29 | 24 | — |
| BOI→SFO Boise to San Francisco | 2025-02-14 – 2025-03-05 | 20 | — |
| PDX→SFO Portland to San Francisco | 2025-02-13 – 2025-02-13 | 1 | — |
| IAH→DCA Houston to Washington | 2025-01-21 – 2025-01-21 | 1 | — |
| PVD→EWR Providence/Warwick to Newark | 2025-01-07 – 2025-01-07 | 1 | — |
| ORD→BOS Chicago to Boston | 2024-09-26 – 2025-01-06 | 79 | — |
| BOS→EWR Boston to Newark | 2024-12-19 – 2025-01-06 | 6 | — |
| ORD→DSM Chicago to Des Moines | 2024-06-01 – 2024-06-26 | 22 | — |
| ORD→AUS Chicago to Austin | 2024-05-23 – 2024-05-31 | 8 | — |
| IND→ORD Indianapolis to Chicago | 2024-05-25 – 2024-05-25 | 1 | — |
| TVC→ORD Traverse City to Chicago | 2023-10-29 – 2024-05-22 | 132 | 77.5% |
| ORD→EWR Chicago to Newark | 2024-01-09 – 2024-05-22 | 131 | 82.4% |
| EWR→JAX Newark to Jacksonville | 2024-01-09 – 2024-02-14 | 32 | — |
| FSD→ORD Sioux Falls to Chicago | 2023-07-01 – 2023-10-28 | 120 | 92.3% |
Because the same number has served different journeys, the statistics above describe only the route UA2099 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.
24 min late
against a median of 4 min early
Percentiles over 155 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
Why UA2099 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding, fuelling — within the carrier’s control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA2099 on ORD → SEA. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on ORD → SEA
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL2041 | Delta Air Lines | 81.1% | 7 min early | 754 |
| UA2278 | United Airlines | 80.1% | 7 min early | 646 |
| AS407 | Alaska Airlines | 75.2% | 2 min early | 693 |
| AS329 | Alaska Airlines | 72.6% | 1 min early | 881 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 155 records of UA2099 operating ORD → SEA, 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 · Report a problem
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