Schedule: a typical Tuesday (the flights of Jul 28, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
JETBLUE · FLIGHT B6 561
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29 Yesterday
B6 561 · BOS → SJU
departs 5:55 PM ET · arrives 10:04 PM AT
Forecast issued Tue 10:00 PM ET · 4h after departure
Watch this flight
Other days
Tue 9/29
Today 46%
Thu 10/1 51%
Fri 10/2 53%
Sat 10/3 33%
Sun 10/4 47%
Mon 10/5 40%
Tue 10/6 37%
Odds over time
Arrive at SJU more than 15 minutes late?
50%
chance · ±0 pts
−2 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
50%
Leave 15+ late
52%
Arrive 1h+ late
19%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
2.8d
2d
1d
12h
6h
Departs
Lands
Arrive at SJU more than 15 minutes late?
Calm-weather odds: 54% · changed −2 pts in 24h
−2 pts
50%
Yes 50%
No 50%
Leave BOS more than 15 minutes late?
Calm-weather odds: 49% · changed +1 pt in 24h
+1 pt
52%
Yes 52%
No 48%
Arrive at SJU more than an hour late?
Calm-weather odds: 19% · changed +2 pts in 24h
+2 pts
19%
Yes 19%
No 81%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SJU?
On time or early
50%
15–30 min late
9%
30 min–1 hour late
21%
1–2 hours late
8%
Over 2 hours late
11%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
B6's recent on-time record
↑
5pm departures from BOS are often late
↑
This flight has been late 43% of the time recently
↓
Tuesdays in September are usually quieter than average
Weather at each end
BOS (origin)
Gusts 11 kt Ceiling 600 ft Visibility 1.5 mi Precip 0.03 in
SJU (destination)
Gusts 25 kt Ceiling 7,840 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.