No delays reported for DL 459 (SEA → BOS) as of 6:43 PM ET. It arrived on time 94.4% of the time in June-August 2026. When it was late, the average delay was 30 minutes. 3.3% of flights were cancelled. Right now there are no reported delays at SEA, BOS.
Looks on time
Next leg SEA → BOS, scheduled 7:29 AM local time. No delays at SEA right now, and it usually runs on time.
Cancellation risk: Medium 3.3% 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.
Before you fly
Some links are affiliate links.
Route and schedule
| Leg | Scheduled | On time |
|---|---|---|
| SEA → BOS Seattle, WA to Boston, MA | 7:29 AM → 4:00 PM | 94% |
Local times. Schedules change; check your booking.
How reliable is DL 459?
| Arrived on time (within 15 min) | 94.4% |
| Average delay when late | 30 min |
| Cancelled | 3.3% |
| Diverted | 0% |
| Flights tracked | 92 |
Best and worst days to fly DL 459
DL 459 was most reliable on Mondays (100% on time) and least reliable on Tuesdays (92%).
| Monday | |
| Tuesday | |
| Wednesday | |
| Thursday | |
| Friday | |
| Saturday | |
| Sunday |
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 459 delayed today?
Right now there are no reported delays at SEA, BOS. Checked 6:43 PM ET. For this flight's gate and exact status, check the Delta app.
Is DL 459 usually on time?
DL 459 arrived within 15 minutes of schedule 94.4% of the time in June-August 2026, with an average delay of 30 minutes when late.
How often is DL 459 cancelled?
3.3% of DL 459 flights were cancelled in June-August 2026.