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 1421
SCHEDULED · TYPICAL SCHEDULE
Monday, October 5
DL 1421 · LAX → SFO
departs 7:00 AM PT · arrives 8:21 AM PT
Forecast issued Sat 2:00 PM ET · 44h before departure
Watch this flight
Other days
Today 14%
Sun 10/4 15%
Mon 10/5
Tue 10/6 11%
Wed 10/7 11%
Thu 10/8 17%
Fri 10/9 20%
Odds over time
Arrive at SFO more than 15 minutes late?
10%
chance · ±1 pts
+1 pt · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
10%
Leave 15+ late
7%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
6.4d
Now
1d
12h
6h
Departs
Lands
Arrive at SFO more than 15 minutes late?
Calm-weather odds: 10% · changed +1 pt in 24h
+1 pt
10%
Yes 10%
No 90%
Leave LAX more than 15 minutes late?
Calm-weather odds: 6% · changed +0 pts in 24h
+0 pts
7%
Yes 7%
No 93%
Arrive at SFO more than an hour late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SFO?
On time or early
89%
15–30 min late
3%
30 min–1 hour late
4%
1–2 hours late
1%
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
↑
SFO is prone to delays
↑
Other factors
↑
This flight has been late 8% of the time recently
↓
Early flights usually leave on time
↓
Visibility down to 2 mi forecast at SFO that day
Weather at each end
LAX (origin)
Gusts 16 kt Ceiling none (clear) Visibility 10+ mi Precip none
SFO (destination)
Gusts 13 kt Ceiling none (clear) Visibility 2 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.