Schedule: the flights that flew on Tuesday, Oct 6, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.

DELTA · FLIGHT DL 977 SCHEDULED · TYPICAL SCHEDULE

Tuesday, October 13

DL 977 · SFO → BOS

departs 12:20 PM PT · arrives 9:02 PM ET

Forecast issued Sun 7:00 PM ET · 44h before departure

Arrive at BOS more than 15 minutes late?

48% chance · ±4 pts +15 pts · 24h

HOW SURE WE ARE Moderate. The odds now blend history with early weather forecasts.

How late will it get to BOS?

On time or early
52%
15–30 min late
12%
30 min–1 hour late
18%
1–2 hours late
14%
Over 2 hours late
4%
Cancelled
<1%

Gate arrival compared with the scheduled arrival. The ranges add up to 100%.

What’s moving the odds

↑ Cloud base down to 200 ft forecast at BOS that day

↑ Arrivals into BOS at that hour are often late

↑ 12pm departures from SFO are often late

↓ Tuesdays in October are usually quieter than average

↓ Mostly benign weather forecast at SFO

Weather at each end

SFO (origin) Gusts17 kt Ceilingnone (clear) Visibility10+ mi Precipnone

BOS (destination) Gusts17 kt Ceiling200 ft Visibility2 mi Precip0.02 in

How this resolves

Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.

Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.

DL 977 · SFO → BOS

Odds over time

How late will it get to BOS?