Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
F9 4278 · Las Vegas (LAS) → Dulles (IAD)
Sold by Frontier. Still flying: 56 of the last 56 days (Daily).
Arrives on time65%within 15 minutes, of 98 flights
Cancelled0.0%of scheduled flights
An hour or more late11%of flights that operated
When late, on average61 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Dulles is 3 h ahead of Las Vegas).
- Leaves LAS
- 00:46
- Arrives IAD
- 08:20
- Flight time
- 4h 35m
- Days flown, last 8 weeks
- 56 of 56
Each square is a day, Sat Jun 6 to Fri Jul 31, two weeks per row (each column is the same weekday); filled = flew.
How late it arrives
Share of flights that operated arriving more than this late.
Horizontal: minutes late at arrival (0 to 3 hours). Vertical: share of flights later than that.
Its hour at LAS
All flights leaving Las Vegas (LAS) at 12–1 am, wherever they’re going: 77% left within 15 minutes and 1.6% were cancelled (2,034 flights in the year). Other Frontier flights on this route →
Upcoming forecasts
Our odds that this flight is late or cancelled on the days we publish.