Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
SOUTHWEST · FLIGHT WN 1677
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Today
WN 1677 · MHT → BWI
departs 5:15 PM ET · arrives 6:55 PM ET
Forecast issued Sun 5:00 AM ET · 12h before departure
Watch this flight
Odds over time
Arrive at BWI more than 15 minutes late?
22%
chance · ±0 pts
+3 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
22%
Leave 15+ late
26%
Arrive 1h+ late
4%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.8d
2d
1d
Now
6h
Departs
Lands
Arrive at BWI more than 15 minutes late?
Calm-weather odds: 16% · changed +3 pts in 24h
+3 pts
22%
Yes 22%
No 78%
Leave MHT more than 15 minutes late?
Calm-weather odds: 27% · changed −6 pts in 24h
−6 pts
26%
Yes 26%
No 74%
Arrive at BWI more than an hour late?
Calm-weather odds: 6% · changed −5 pts in 24h
−5 pts
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 BWI?
On time or early
77%
15–30 min late
8%
30 min–1 hour late
10%
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
↑
Later flights pick up delays from earlier in the day
↑
Cloud base down to 300 ft, visibility down to 2.5 mi forecast at BWI that day
↑
Arrivals into BWI at that hour are often late
↓
BWI usually runs smoothly
↓
This flight has been late 25% of the time recently
Weather at each end
MHT (origin)
Gusts 13 kt Ceiling 100 ft Visibility 0.75 mi Precip 0.02 in
BWI (destination)
Gusts 12 kt Ceiling 300 ft Visibility 2.5 mi Precip 0.18 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.