Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
DELTA · FLIGHT DL 2921
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1
DL 2921 · SLC → SEA
departs 1:20 PM MT · arrives 2:35 PM PT
Forecast issued Tue 11:00 PM ET · 40h before departure
Watch this flight
Other days
Today 23%
Thu 10/1
Fri 10/2 21%
Sat 10/3 15%
Sun 10/4 26%
Mon 10/5 19%
Tue 10/6 17%
Odds over time
Arrive at SEA more than 15 minutes late?
17%
chance · ±1 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
17%
Leave 15+ late
12%
Arrive 1h+ late
4%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at SEA more than 15 minutes late?
Calm-weather odds: 15% · changed +0 pts in 24h
+0 pts
17%
Yes 17%
No 83%
Leave SLC more than 15 minutes late?
Calm-weather odds: 12% · changed −2 pts in 24h
−2 pts
12%
Yes 12%
No 88%
Arrive at SEA more than an hour late?
Calm-weather odds: 3% · changed +1 pt in 24h
+1 pt
4%
Yes 4%
No 96%
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
82%
15–30 min late
8%
30 min–1 hour late
5%
1–2 hours late
2%
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
↑
SEA is busy at that time
↑
Early flights usually leave on time
↓
Mostly benign weather forecast at SLC
↓
Mostly benign weather forecast at SEA
Weather at each end
SLC (origin)
Gusts 12 kt Ceiling none (clear) Visibility 10+ mi Precip none
SEA (destination)
Gusts 6 kt Ceiling 3,400 ft Visibility 8 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.