Schedule: a typical Friday (the flights of Jul 31, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
UNITED · FLIGHT UA 688
SCHEDULED · TYPICAL SCHEDULE
Tomorrow
UA 688 · IAD → BOS
departs 5:25 PM ET · arrives 7:14 PM ET
Forecast issued Thu 7:00 PM ET · 22h before departure
Odds over time
Arrive at BOS more than 15 minutes late?
46%
chance · ±4 pts
−20 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
-
-
-
-
How late will it get to BOS?
-
On time or early
54%
-
15–30 min late
8%
-
30 min–1 hour late
16%
-
1–2 hours late
13%
-
Over 2 hours late
8%
-
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.