DL400Delta Air Lines · SFO → BOS
live · 16m ago
Route confirmed Delta Air Lines

DL400 San FranciscoSFO · 07:00 BostonBOS · 15:45

DL400 by Delta Air Lines flies from San Francisco (SFO) to Boston (BOS) for the Tue, Nov 3 departure.

Right nowEn route to Boston · off blocks 06:51 · 9 min early
En route

en route from SFO to BOS

En routeDL400 · position estimated
SFOSan FranciscoBOSBoston
Estimated from the boards

Board estimate · gate and arrival times. Off blocks 06:51 · typical taxi-out at SFO ≈ 11.2 min. No receiver coverage over open ocean.

Typical gate push−9 minmedian posted departure
Typical arrival−28 minmedian over 3 operations
Wins back in air~19 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 3 operations · gate push → arrival
0+30+60+90 min
11-03
−9 gate · −23 arrival
11-02
−9 gate · −28 arrival
11-01
−5 gate · −42 arrival

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The route today

live boards
SFOSan FranciscoOn-time likelySFO delay board →
BOSBostonOn-time likelyBOS delay board →
SFO→BOSevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
46%Chance of 15+ min delay
2.5%Chance of cancellation
+11 minTypical airport delay in this weather

Conditions at SFO and BOS are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records 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 →

Tomorrow at San Francisco

Forecast

Wed 4 Nov, local date

High19°Clikely 18°C to 20°C
Low12°Clikely 11°C to 14°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at Boston

Forecast

Wed 4 Nov, local date

High24°Clikely 22°C to 25°C
Low14°Clikely 12°C to 15°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

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 San Francisco to Boston flights today

same route · Delta Air Lines
DL977departs 12:40
DL860departs 15:00
DL1655departs 21:54

If DL400 is cancelled, these are the other Delta Air Lines nonstop flights from San Francisco to Boston on the same day, with scheduled departure times in SFO local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How DL400 actually runs

Pro Flight Search has tracked every published board update for DL400 across the SFO and BOS boards: schedule changes, gate pushes and actual clocks. Early read: no clear pattern yet. Only 1 completed leg so far: left about 9 min early but landed about 23 min early. Not enough to call it.

The verdict above is that record speaking, so it reflects how DL400 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
11-03SFO 07:00 06:51 (−9)BOS 15:45 15:22 (−23)
11-02SFO 07:00 06:51 (−9)BOS 15:45 15:17 (−28)
11-01SFO 07:00 06:55 (−5)BOS 15:45 15:03 (−42)

Board clocks recorded as SFO and BOS published them.

Planning around DL400? 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: DL400 San Francisco to Boston on-time performance, measured from the SFO and BOS airport boards.

Canonical URL
https://proflightsearch.com/flight/DL400
How we measure this →