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SEA → IAD
Seattle to Washington · departing 9:55 AM
SEA → IAD flights departing 9 AM–12 PM arrive on time 77.3% of the time, against 81.3% across the whole day — your departure window is 4.0 points worse than average for this route.
There is no day-by-hour view for SEA → IAD: only 11 of its weekday-and-hour slots have 120 or more flights, and a day-by-hour view needs 45.
Other times on SEA → IAD
Time of day
On SEA → IAD, flights leaving 12–3 PM arrived on time 86.7% of the time, against 77.3% for those leaving 9 AM–12 PM: 9.4 points more often.
- 5–9 AM85.6%
- 9 AM–12 PM77.3%
- 12–3 PM86.7%
- 3–6 PM77.4%
- 6–9 PMToo few flights to score
- 9 PM–5 AM79.6%
Day of week
- Monday81.2%
- Tuesday83.1%
- Wednesday85.4%
- Thursday81.9%
- Friday79.1%
- Saturday80.5%
- Sunday78.1%
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 → IAD, the ones scheduled closest to 9:55 AM first.
Within 90 minutes of 9:55 AM, AS737 (usually 9:13 AM) has the best record: 83.3% on time and 0.49% cancelled over 206 flights, against 81.3% on time for SEA → IAD as a whole.
| Flight | Usually departs | On time | Cancelled |
|---|---|---|---|
| AS406Alaska AirlinesLive map | 10:00 AM5 min away | 75.6% | 1.04% |
| AS737Alaska AirlinesLive map | 9:13 AM42 min away | 83.3% | 0.49% |
| AS367Alaska AirlinesLive map | 11:30 PM625 min away | 80.3% | 0.30% |
| DL541Delta Air LinesLive map | 9:55 PM720 min away | 77.7% | 0.76% |
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.
2h 20m before your 9:55 AM 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
Weather conditions are strongly associated with delays and cancellations.
Severe operational impact. Conditions of this kind are strongly associated with delays and cancellations.
- Visibility 3 statute miles.
- Cloud ceiling 100 feet.
Aviation 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 |
|---|---|---|---|---|
| Alaska Airlines | 2,624 | 78.7% | 0.46% | -3 min |
| United Airlines | 2,426 | 85.3% | 1.94% | -9 min |
| Delta Air Lines | 1,475 | 79.6% | 0.88% | -7 min |