Flight profile · United Airlines
UA340
Atlanta (ATL) to Denver (DEN) · scheduled 9:00 AM – 8:52 AM
How UA340 performs
887 operations, 2023-07-01 to 2026-06-30.
UA340 arrived on time 89.1% of the time, against 77.2% for all ATL → DEN flights — this specific departure is 11.9 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 4.6 points better.
Source: US DOT Bureau of Transportation Statistics · 887 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA340 | 89.1% | 1.69% | -9 min | 2.8% | 887 |
| United Airlines on ATL → DEN | 84.5% | 1.12% | -8 min | 6.0% | 3,127 |
| All ATL → DEN flights | 77.2% | 0.93% | -4 min | 7.2% | 17,571 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does UA340 run worse on particular days?
Friday is historically the most reliable day and Saturday the least, a gap of 4.8 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes UA340 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 |
|---|---|---|---|
| SAT→SFO San Antonio to San Francisco | 2026-06-28 – 2026-06-28 | 1 | — |
| ABQ→ORD Albuquerque to Chicago | 2026-05-21 – 2026-06-24 | 35 | — |
| ORD→LGA Chicago to New York | 2026-06-01 – 2026-06-24 | 24 | — |
| DEN→PWM Denver to Portland | 2025-10-26 – 2025-12-01 | 37 | — |
| DFW→IAH Dallas–Fort Worth to Houston | 2025-06-29 – 2025-08-17 | 15 | — |
| IAH→MSY Houston to New Orleans | 2025-07-02 – 2025-07-30 | 5 | — |
| RDU→SFO Raleigh–Durham to San Francisco | 2025-07-05 – 2025-07-05 | 1 | — |
| SFO→SBA San Francisco to Santa Barbara | 2025-06-25 – 2025-06-25 | 1 | — |
| EWR→SAV Newark to Savannah | 2025-06-01 – 2025-06-22 | 4 | — |
| EWR→ORD Newark to Chicago | 2025-03-06 – 2025-03-29 | 24 | — |
| EWR→DTW Newark to Detroit | 2025-02-13 – 2025-03-05 | 21 | — |
| SFO→DEN San Francisco to Denver | 2024-03-07 – 2024-03-30 | 24 | — |
| BUF→ORD Buffalo to Chicago | 2024-02-18 – 2024-03-03 | 3 | — |
| EWR→BZN Newark to Bozeman | 2024-01-09 – 2024-02-14 | 37 | — |
Because the same number has served different journeys, the statistics above describe only the route UA340 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 887 records of UA340 operating ATL → DEN, 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.