DL438Delta Air Lines · SEA → BOS
live · 4m ago
Route confirmed Delta Air Lines

DL438 SeattleSEA · 11:08 BostonBOS

DL438 by Delta Air Lines flies from Seattle (SEA) to Boston (BOS) for the Fri, Oct 23 departure.

Right nowOn time · gate A13
11:08

departs SEA · on schedule

Typical arrival+48 minmedian over 2 operations

The route today

live boards
SEASeattleModerate riskSEA delay board →
BOSBostonOn-time likelyBOS delay board →
SEA→BOSevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
41%Chance of 15+ min delay
3.1%Chance of cancellation
+9 minAvg hub delay right now

Conditions at SEA and BOS are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other Seattle to Boston flights today

same route · Delta Air Lines
DL459departs 07:24
DL474departs 15:30
DL473departs 23:10

If DL438 is cancelled, these are the other Delta Air Lines nonstop flights from Seattle to Boston on the same day, with scheduled departure times in SEA local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →

How DL438 actually runs

Pro Flight Search has tracked every published board update for DL438 across the SEA and BOS boards: schedule changes, gate pushes and actual clocks. Combined risk score: 24.5/100. Based on airport operations, weather, and cached board history at SEA and BOS.

The verdict above is that record speaking, so it reflects how DL438 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocks

Board log

scheduled → actual, per operation
10-22SEA 11:08BOS 19:41 19:14 (−27)
10-21SEA 11:08BOS 19:41 20:29 (+48)

Board clocks recorded as SEA and BOS published them.

Planning around DL438? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search — DL438 Seattle to Boston on-time performance, measured from the SEA and BOS airport boards.

Canonical URL
https://proflightsearch.com/flight/DL438
How we measure this →