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 2721
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29
DL 2721 · SFO → SEA
departs 5:55 AM PT · arrives 8:05 AM PT
Forecast issued Tue 10:00 PM ET · 13h after departure
Watch this flight
Other days
Tue 9/29
Today 14%
Mon 10/5 9%
Wed 10/7 4%
Thu 10/8 5%
Fri 10/9 5%
Sat 10/10 6%
Odds over time
Arrive at SEA more than 15 minutes late?
8%
chance · ±0 pts
−2 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
8%
Leave 15+ late
3%
Arrive 1h+ late
2%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
2.8d
2d
1d
12h
6h
Departs
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 8% · changed −2 pts in 24h
−2 pts
8%
Yes 8%
No 92%
Leave SFO more than 15 minutes late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Arrive at SEA more than an hour late?
Calm-weather odds: 2% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
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
91%
15–30 min late
4%
30 min–1 hour late
2%
1–2 hours late
1%
Over 2 hours late
1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
SEA is prone to delays
↑
Cloud base down to 500 ft forecast at SEA that day
↑
SFO is prone to delays
↓
Early flights usually leave on time
↓
5am departures from SFO are usually not late
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.