My trip
Plan a trip
Tell FlyerIntel where and when you are flying. It will show how that route actually performs at that time of day and on that day of the week, what both airports are doing right now, and when to get to the airport.
SEA → DEN
Seattle to Denver · departing 8:20 PM
SEA → DEN flights departing 6–9 PM arrive on time 74.9% of the time, against 77.9% across the whole day — your departure window is 3.0 points worse than average for this route.
Your slot
Add a date above to see how that hour has done on your day of the week, and what a nearby slot would change.
Other times on SEA → DEN
Time of day
On SEA → DEN, flights leaving 5–9 AM arrived on time 88.2% of the time, against 74.9% for those leaving 6–9 PM: 13.3 points more often.
- 5–9 AM88.2%
- 9 AM–12 PM81.1%
- 12–3 PM70.9%
- 3–6 PM70.1%
- 6–9 PM74.9%
- 9 PM–5 AM56.6%
Day of week
- Monday78.0%
- Tuesday78.8%
- Wednesday80.0%
- Thursday77.0%
- Friday77.0%
- Saturday80.2%
- Sunday75.1%
Bars start below the lowest figure so a real gap is visible; read the percentage, not the bar length. A time with too few flights to score is left unscored rather than guessed at.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · History describes what has happened on this route. It is not a prediction about your flight. Full route profile →
Which flight
Flights on SEA → DEN, the ones scheduled closest to 8:20 PM first.
Within 90 minutes of 8:20 PM, UA1218 (usually 7:00 PM) has the best record: 83.6% on time and 0.36% cancelled over 281 flights, against 77.9% on time for SEA → DEN as a whole.
| Flight | Usually departs | On time | Cancelled |
|---|---|---|---|
| AS642Alaska AirlinesLive map | 8:20 PM | 75.5% | 0.30% |
| DL2851Delta Air LinesLive map | 7:55 PM25 min away | 75.3% | 1.02% |
| F91176Frontier AirlinesLive map | 7:48 PM32 min away | 73.3% | 1.69% |
| UA1218United AirlinesLive map | 7:00 PM80 min away | 83.6% | 0.36% |
| AS602Alaska AirlinesLive map | 3:49 PM271 min away | 65.3% | 0.43% |
| UA757United AirlinesLive map | 3:48 PM272 min away | 84.3% | 1.15% |
| AS535Alaska AirlinesLive map | 10:20 AM600 min away | 70.9% | 1.12% |
| F93406Frontier AirlinesLive map | 6:25 AM605 min away | 75.5% | 1.38% |
| DL1358Delta Air LinesLive map | 7:55 AM695 min away | 84.5% | 0.00% |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · “Usually departs” is the scheduled time each flight number most often had over the period; airlines retime flights, so confirm the time on your booking. Flight numbers with fewer than 90 operations on this route are left out. This is history, not a forecast for your flight.
When to get to the airport
A starting point for SEA, not a promise about your day.
1h 45m before your 8:20 PM departure
How this was worked out
- It does not include your journey to the airport, parking, or a shuttle from a remote lot.
- International departures, and travel with children, checked pets or special assistance, need more time.
Both airports right now
Aviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedAviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedSource: NOAA Aviation Weather Center · Conditions describe the airfield, not your flight, and change quickly.
Who flies this route
Performance by the carrier that actually operates the flight.
| Carrier | Flights | On time | Cancelled | Median delay |
|---|---|---|---|---|
| United Airlines | 6,060 | 86.6% | 0.94% | -11 min |
| Alaska Airlines | 4,902 | 75.1% | 0.71% | -2 min |
| Southwest Airlines | 4,524 | 72.6% | 0.40% | 1 min |
| Delta Air Lines | 2,874 | 75.3% | 0.66% | -5 min |
| Frontier Airlines | 1,435 | 71.7% | 1.46% | -1 min |
| SkyWest Airlines | 496 | 82.8% | 0.40% | -8 min |