Schedule: a typical summer Monday (the flights of Jul 27, 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
Monday, October 5
DL 2721 · SFO → SEA
departs 5:55 AM PT · arrives 8:05 AM PT
Forecast issued Sat 2:00 AM ET · 55h before departure
Watch this flight
Other days
Today 10%
Sun 10/4 8%
Mon 10/5
Wed 10/7 4%
Thu 10/8 5%
Fri 10/9 5%
Odds over time
Arrive at SEA more than 15 minutes late?
7%
chance · ±0 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
7%
Leave 15+ late
4%
Arrive 1h+ late
2%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
6.4d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 4% · changed – in 24h
–
7%
Yes 7%
No 93%
Leave SFO more than 15 minutes late?
Calm-weather odds: 4% · changed – in 24h
–
4%
Yes 4%
No 96%
Arrive at SEA more than an hour late?
Calm-weather odds: 2% · changed – in 24h
–
2%
Yes 2%
No 98%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to SEA?
On time or early
92%
15–30 min late
3%
30 min–1 hour late
2%
1–2 hours late
0%
Over 2 hours late
2%
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
↑
SFO is prone to delays
↑
Cloud base down to 200 ft forecast at SEA that day
↓
Early flights usually leave on time
↓
5am departures from SFO are usually not late
Weather at each end
SFO (origin)
Gusts 12 kt Ceiling none (clear) Visibility 2 mi Precip none
SEA (destination)
Gusts 5 kt Ceiling 200 ft Visibility 10+ mi Precip none
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.