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.
SOUTHWEST · FLIGHT WN 4208
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Tomorrow
WN 4208 · BOS → DEN
departs 11:35 AM ET · arrives 2:05 PM MT
Forecast issued Wed 2:00 AM ET · 34h before departure
Watch this flight
Other days
Thu 10/1
Fri 10/2 24%
Sat 10/3 22%
Mon 10/5 22%
Odds over time
Arrive at DEN more than 15 minutes late?
23%
chance · ±3 pts
−7 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
23%
Leave 15+ late
22%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 16% · changed −7 pts in 24h
−7 pts
23%
Yes 23%
No 77%
Leave BOS more than 15 minutes late?
Calm-weather odds: 20% · changed +0 pts in 24h
+0 pts
22%
Yes 22%
No 78%
Arrive at DEN more than an hour late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to DEN?
On time or early
77%
15–30 min late
14%
30 min–1 hour late
5%
1–2 hours late
3%
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
↑
This flight has been late 26% of the time recently
↑
WN's recent on-time record
↑
11am departures from BOS are often late
↓
Mostly benign weather forecast at DEN
↓
Early flights usually leave on time
Weather at each end
BOS (origin)
Gusts 16 kt Ceiling none (clear) Visibility 0.8 mi Precip none
DEN (destination)
Gusts 20 kt Ceiling 8,000 ft Visibility 7 mi Precip 0.16 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.