No delays reported for DL 473 (SEA → BOS) as of 6:45 PM ET. It arrived on time 89.9% of the time in June-August 2026. When it was late, the average delay was 40 minutes. 2.2% of flights were cancelled. Right now there are no reported delays at SEA, BOS.
Looks on time
Next leg SEA → BOS, scheduled 11:15 PM local time. No delays at SEA right now, and it usually runs on time.
Cancellation risk: Low 2.2% of its flights were cancelled in June-August 2026.
Estimate from the schedule, live position and airport conditions, if this flight operates today. Check Delta for official times. Live position: adsb.lol (open data, ODbL).
Before you fly
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Route and schedule
| Leg | Scheduled | On time |
|---|---|---|
| SEA → BOS Seattle, WA to Boston, MA | 11:15 PM → 7:35 AM | 90% |
Local times. Schedules change; check your booking.
How reliable is DL 473?
| Arrived on time (within 15 min) | 89.9% |
| Average delay when late | 40 min |
| Cancelled | 2.2% |
| Diverted | 1.1% |
| Flights tracked | 92 |
Best and worst days to fly DL 473
DL 473 was most reliable on Tuesdays (100% on time) and least reliable on Mondays (71%).
| Monday | |
| Tuesday | |
| Wednesday | |
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Why it runs late
| Late-arriving plane | |
| Airline (crew, maintenance) | |
| Air traffic system | |
| Extreme weather |
Share of delay minutes by cause, as reported by Delta to the Department of Transportation.
Other flights SEA → BOS
All flights on this route, ranked
Live status at its airports
We show airport-wide airport status, not this flight's gate or live position. For that, check the Delta app.
Delta delays and what you're owed · Airline phone numbers
About this data
On-time history: U.S. Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, June-August 2026. Live conditions: live airport status. "On time" means arriving within 15 minutes of schedule.
Common questions
Is DL 473 delayed today?
Right now there are no reported delays at SEA, BOS. Checked 6:45 PM ET. For this flight's gate and exact status, check the Delta app.
Is DL 473 usually on time?
DL 473 arrived within 15 minutes of schedule 89.9% of the time in June-August 2026, with an average delay of 40 minutes when late.
How often is DL 473 cancelled?
2.2% of DL 473 flights were cancelled in June-August 2026.