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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 → BOS
Seattle to Boston · departing 9:25 PM
There is no day-by-hour view for SEA → BOS: only 21 of its weekday-and-hour slots have 120 or more flights, and a day-by-hour view needs 45.
Other times on SEA → BOS
Time of day
On SEA → BOS, flights leaving 5–9 AM arrived on time 84.9% of the time, against 76.6% for those leaving 9 PM–5 AM: 8.3 points more often.
- 5–9 AM84.9%
- 9 AM–12 PM58.0%
- 12–3 PM50.0%
- 3–6 PM75.7%
- 6–9 PMToo few flights to score
- 9 PM–5 AM76.6%
Day of week
- Monday75.8%
- Tuesday77.7%
- Wednesday78.3%
- Thursday71.9%
- Friday73.9%
- Saturday75.8%
- Sunday73.1%
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 → BOS, the ones scheduled closest to 9:25 PM first.
Within 90 minutes of 9:25 PM, DL473 (usually 10:05 PM) has the best record: 84.0% on time and 1.41% cancelled over 782 flights, against 75.2% on time for SEA → BOS as a whole.
| Flight | Usually departs | On time | Cancelled |
|---|---|---|---|
| AS536Alaska AirlinesLive map | 9:25 PM | 72.7% | 0.62% |
| B6198JetBlueLive map | 8:50 PM35 min away | 63.5% | 1.29% |
| DL473Delta Air LinesLive map | 10:05 PM40 min away | 84.0% | 1.41% |
| AS460Alaska AirlinesLive map | 3:45 PM340 min away | 75.0% | 0.75% |
| DL474Delta Air LinesLive map | 3:35 PM350 min away | 73.8% | 1.27% |
| AS306Alaska AirlinesLive map | 6:30 AM545 min away | 77.6% | 1.26% |
| B6398JetBlueLive map | 11:30 AM595 min away | 50.4% | 0.88% |
| DL459Delta Air LinesLive map | 7:50 AM625 min away | 89.4% | 1.53% |
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 0m before your 9:25 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
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 | 3,714 | 72.9% | 0.75% | -2 min |
| Delta Air Lines | 2,980 | 83.9% | 1.07% | -9 min |
| JetBlue | 1,208 | 60.7% | 1.16% | 5 min |