UA721United Airlines · BOS → IAD
updated 14m ago
Route confirmed United Airlines

UA721 BostonBOS · 14:40 WashingtonIAD · 16:27

UA721 by United Airlines flies from Boston (BOS) to Washington (IAD) for the Mon, Nov 9 departure.

Right nowLanded in Washington · today
16:19

arrived at IAD · 8 min early

Typical gate push+15 minmedian posted departure
Typical arrival−8 minmedian over 3 operations
Wins back in air~23 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 4 operations · gate push → arrival
0+47+93+140 min
11-09
+10 gate · −8 arrival
11-08
+20 gate · +32 arrival
11-07
+0 gate · −24 arrival
11-06
+140 gate

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The route today

live boards
BOSBostonOn-time likelyBOS delay board →
IADWashingtonOn-time likelyIAD delay board →
BOS→IADevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
37%Chance of 15+ min delay
3.5%Chance of cancellation
+3 minTypical airport delay in this weather

Conditions at BOS and IAD are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

Tomorrow at Boston

Forecast

Tue 10 Nov, local date

High14°Clikely 13°C to 15°C
Low7°Clikely 6°C to 8°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at Washington

Forecast

Tue 10 Nov, local date

High21°Clikely 19°C to 22°C
Low3°Clikely 2°C to 5°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other Boston to Washington flights today

same route · United Airlines
UA1734departs 05:30
UA2098departs 09:30
UA3409departs 17:49
UA1783departs 18:00
UA3630departs 19:41
UA694departs 19:41

If UA721 is cancelled, these are the other United Airlines nonstop flights from Boston to Washington on the same day, with scheduled departure times in BOS local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How UA721 actually runs

Pro Flight Search has tracked every published board update for UA721 across the BOS and IAD boards: schedule changes, gate pushes and actual clocks. Usually lands ~5 min early. Based on 3 confirmed landings · 2/3 within 15 min of schedule. Pushes back late but makes up time in the air.

The verdict above is that record speaking, so it reflects how UA721 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocksaircraft

Board log

scheduled → actual, per operation
11-09BOS 14:40 14:50 (+10)IAD 16:27 16:19 (−8)
11-08BOS 14:40 15:00 (+20)IAD 16:27 16:59 (+32)
11-07BOS 14:40 (+0)IAD 16:27 16:03 (−24)
11-06BOS 14:40 17:00 (+140)IAD

Aircraft

Recent tails: N39423, N61882.

Board clocks recorded as BOS and IAD published them.

Planning around UA721? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search: UA721 Boston to Washington on-time performance, measured from the BOS and IAD airport boards.

Canonical URL
https://proflightsearch.com/flight/UA721
How we measure this →