Best time to fly out of Yellowstone (WYS)
Yellowstone did not fly enough departures in this window to split the day into time bands. Not enough flights to say. A percentage needs at least 100 flights behind it before it is worth printing; anything thinner is noise wearing a decimal point. These are historical odds, not forecasts. The records say what happened on this schedule over three years; they know nothing about tomorrow’s thunderstorm.
Data through June 2026 · Bureau of Transportation Statistics
On-time rate by hour and day
On this page, “on time” means a departure that pushed back less than 15 minutes behind its scheduled time — the Bureau of Transportation Statistics definition, and the one airlines are held to.
| Departure time | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| Before 6am | – | – | – | – | – | – | – |
| 6–8am | – | – | – | – | – | – | – |
| 8–10am | – | – | – | – | – | – | – |
| 10am–12pm | – | – | – | – | – | – | – |
| 12–2pm | – | – | – | – | – | – | – |
| 2–4pm | – | – | – | – | – | – | – |
| 4–6pm | – | – | – | – | – | – | – |
| 6–8pm | – | – | – | – | – | – | – |
| 8–10pm | – | – | – | – | – | – | – |
| 10pm–12am | – | – | – | – | – | – | – |
Not enough flights to say — fewer than 100 in this window.
The year at WYS
May was the hard month at WYS: 78.9% of departures left on time, across 125 flights. September was the easy one at 91.8%. Each month pools three years of that month, so a single bad week does not decide it.
| Month | Share departures that left on time | Flights |
|---|---|---|
| January | Not enough flights to say | 0 |
| February | Not enough flights to say | 0 |
| March | Not enough flights to say | 0 |
| April | Not enough flights to say | 0 |
| May | 78.9% | 125 |
| June | 81.5% | 204 |
| July | 85% | 206 |
| August | 87.2% | 205 |
| September | 91.8% | 186 |
| October | Not enough flights to say | 51 |
| November | Not enough flights to say | 0 |
| December | Not enough flights to say | 0 |
Airlines at WYS
Every airline with at least 100 departures from WYS, busiest first. These are that airline’s departures from this airport only — its record across the country sits on its own page.
| Airline | Left on time | Typical delay | Cancelled | Departures |
|---|---|---|---|---|
| SkyWest Airlines | 85.6% | 130 min | 1% | 977 |
What delays out of WYS were put down to
Airlines file a reason with every arrival running 15 minutes late or more. Across 146 flights that departed WYS and ran 15 minutes late or more, the delay minutes break down with 45.3% put down to airline operations and 25.9% to severe weather.
- Late-arriving aircraft 21.7%
- Airline operations 45.3%
- Air traffic & airport volume 7.2%
- Severe weather 25.9%
- Security 0%
Late-arriving aircraft is the knock-on category: the plane came in late, so it went out late again. It is why a 7am problem in Newark is still a problem in Denver at dinnertime, and why it is usually the biggest slice on the bar.
If you are connecting through WYS
Of 977 scheduled arrivals into WYS, 85% reached the gate less than 15 minutes behind schedule. Of the 125 arrivals that ran late, 62.4% were no more than 45 minutes behind — which is the difference between a tight connection and a new boarding pass.
Work out a specific layover — pick the airport and the minutes you have, and the tool reads the same arrival records back as a share.
Busiest routes out of WYS
Ranked by flights, with the share that arrived on time at the far end. Where a route carries enough flights for a page of its own the chip goes there; otherwise it goes to the destination airport.
WYS in one number
Yellowstone (WYS)
Rank 332 of 363 US airports by departures. Steadiest stretch of the day: —. Hardest month: May.
Questions about WYS
- What is the worst month to fly out of WYS?
- May: 78.9% of the departures that flew left on time, with 125 scheduled. September was the other end of the year at 91.8%. Each figure pools three years of that calendar month.
- How often are flights cancelled at WYS?
- 1% of scheduled departures were cancelled over July 2023 through June 2026. Cancellations are counted against everything scheduled, not against everything that flew — a rate that looks small still adds up to real people in a rebooking line.