Schedule: a typical summer Tuesday (the flights of Jul 28, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
DELTA · FLIGHT DL 2870
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29
DL 2870 · SFO → SEA
departs 10:35 AM PT · arrives 12:48 PM PT
Forecast issued Tue 10:00 PM ET · 8h after departure
Watch this flight
Other days
Tue 9/29
Today 48%
Mon 10/5 30%
Fri 10/9 32%
Odds over time
Arrive at SEA more than 15 minutes late?
39%
chance · ±0 pts
+9 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
39%
Leave 15+ late
22%
Arrive 1h+ late
6%
Cancelled
1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.9d
2d
1d
12h
6h
Departs
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 41% · changed +9 pts in 24h
+9 pts
39%
Yes 39%
No 61%
Leave SFO more than 15 minutes late?
Calm-weather odds: 22% · changed +6 pts in 24h
+6 pts
22%
Yes 22%
No 78%
Arrive at SEA more than an hour late?
Calm-weather odds: 6% · changed +0 pts in 24h
+0 pts
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: 1% · changed +0 pts in 24h
+0 pts
1%
Yes 1%
No 99%
How late will it get to SEA?
On time or early
60%
15–30 min late
22%
30 min–1 hour late
11%
1–2 hours late
3%
Over 2 hours late
3%
Cancelled
1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
10am departures from SFO are often late
↑
SEA is prone to delays
↑
Cloud base down to 500 ft forecast at SEA that day
↓
Mostly benign weather forecast at SFO
↓
Tuesdays in September are usually quieter than average
Weather at each end
SFO (origin)
Gusts 19 kt Ceiling none (clear) Visibility 10+ mi Precip none
SEA (destination)
Gusts 24 kt Ceiling 500 ft Visibility 3 mi Precip 0.04 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.