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 · SFO → LAX
departs 9:20 AM PT · arrives 10:53 AM PT
Forecast issued Fri 6:00 PM ET · 66h before departure
Watch this flight
Other days
Today 13%
Sat 10/3 8%
Sun 10/4 8%
Mon 10/5
Tue 10/6 8%
Wed 10/7 8%
Thu 10/8 10%
Odds over time
Arrive at LAX more than 15 minutes late?
6%
chance · ±1 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
6%
Leave 15+ late
9%
Arrive 1h+ late
2%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
6.5d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at LAX more than 15 minutes late?
Calm-weather odds: 7% · changed – in 24h
–
6%
Yes 6%
No 94%
Leave SFO more than 15 minutes late?
Calm-weather odds: 9% · changed – in 24h
–
9%
Yes 9%
No 91%
Arrive at LAX 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 LAX?
On time or early
93%
15–30 min late
<1%
30 min–1 hour late
3%
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
↑
LAX is prone to delays
↑
This flight has been late 10% of the time recently
↓
Visibility down to 2 mi forecast at SFO that day
↓
Mostly benign weather forecast at LAX
Weather at each end
SFO (origin)
Gusts 8 kt Ceiling none (clear) Visibility 2 mi Precip none
LAX (destination)
Gusts 11 kt Ceiling none (clear) 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.