DL4639 BoiseBOI · 08:50 San FranciscoSFO
DL4639 by Delta Air Lines flies from Boise (BOI) to San Francisco (SFO).
scheduled from BOI
Where the minutes go
last 7 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operation0 cancelled · 8 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at BOI and SFO 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 departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Boise to San Francisco flights today
same route · Delta Air LinesIf DL4639 is cancelled, these are the other Delta Air Lines nonstop flights from Boise to San Francisco on the same day, with scheduled departure times in BOI local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How DL4639 actually runs
Pro Flight Search has tracked every published board update for DL4639 across the BOI and SFO boards: schedule changes, gate pushes and actual clocks. Usually departs ~21 min late. Based on 8 confirmed departures · 3/8 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how DL4639 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N168SY, N118SY, N153SY, N138SY.
Board clocks recorded as BOI and SFO published them.
Planning around DL4639? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search — DL4639 Boise to San Francisco on-time performance, measured from the BOI and SFO airport boards.
https://proflightsearch.com/flight/DL4639
.