UA521: United flight 521
Houston (IAH) → Boston (BOS) · departs 6:35p, lands 11:25p local · Daily
The timetable below has every scheduled departure; for today's flight, check United.
An estimate from the published timetable, not live tracking: it cannot know about delays, diversions or cancellations.
Live status at United →The route
One hop: IAH → BOSDrag to pan · scroll with ⌘/Ctrl to zoom · arrow keys when focused
UA521 timetable
Published departure and arrival times, each in its airport's local time, from the flights we sampled.
| Route | Departs | Arrives | Scheduled | Days |
|---|---|---|---|---|
| IAH → BOSHouston to Boston | 6:35p | 11:25p | 3h50m | Daily |
| ATL → IAHAtlanta to Houston | 3:57p | 5:21p | 2h24m | Mon, Wed, Thu, Fri, Sat, Sun |
Other nonstops from Houston to Boston
The departures either side of UA521. Times are Houston time.
| Flight | Departs | Days |
|---|---|---|
| United UA1226 | 12:05p | Daily |
| JetBlue | 2:01p | Daily |
| United UA462 | 4:38p | Mon, Wed, Thu, Fri, Sat, Sun |
| This flight UA521 | 6:35p | Daily |
| JetBlue | 7:05p | Mon, Tue, Wed, Thu, Fri, Sun |
All 8 flights from IAH to BOS, by time →
Flying back from Boston
United flies Boston to Houston nonstop 34 times a week, from 7:15a to 5:17p: 7:15a UA226 · 9:43a UA1388 · 1:32p UA340 · 3:28p UA1183 · 5:17p UA723 · every nonstop BOS → IAH →
How UA521 ran in our sample
IAH → BOS
8 of 13 departures left within 15 minutes of schedule (Oct 4–Nov 11). Only flights that departed are counted: cancellations are not in our data.
Aircraft: Boeing 737 MAX 8 on 5 of 7; also Boeing 737-800 (2).
ATL → IAH
3 of 6 departures left within 15 minutes of schedule (Nov 4–9). Only flights that departed are counted: cancellations are not in our data.
Aircraft: Airbus A320 on 4 of 6; also Airbus A319 (2).
Other flights on this route: UA532 · DL1585 · DL1682 · UA2212 · DL2709 · UA411 · DL1874 · DL1131 · DL2341 · UA2376 · DL1284 · DL1601 · all of them →
What time does UA521 leave Houston?
UA521 is scheduled to depart Houston (IAH) at 6:35p (daily), Houston time, and to land in Boston (BOS) at about 11:25p local time, a scheduled 3h50m. Times are the published ones from the flights we sampled Oct 4–Nov 11; check United for today's.
What time does UA521 leave Atlanta?
UA521 is scheduled to depart Atlanta (ATL) at 3:57p (Mon, Wed, Thu, Fri, Sat, Sun), Atlanta time, and to land in Houston (IAH) at about 5:21p local time, a scheduled 2h24m. Times are the published ones from the flights we sampled Nov 4–9; check United for today's.
What plane is UA521?
Boeing 737 MAX 8 on 5 of the 7 UA521 flights from IAH we sampled Oct 4–Nov 11; the rest were a Boeing 737-800. Airlines swap aircraft, so the plane on a given day can differ.
Does UA521 fly every day?
Yes — UA521 flew Houston to Boston every day of the week we sampled (Oct 4–Nov 11).
Is UA521 usually on time?
Of 13 UA521 departures from IAH we sampled Oct 4–Nov 11, 8 left within 15 minutes of the scheduled time. That counts only flights that departed — cancellations are not in our data — and one week is a small sample, so treat it as a hint, not a rating.
More United flights from Houston
Timetable from United departures we observed; UA521 is a United Airlines flight number, and Hop Nonstop is not affiliated with United. Schedules change — confirm with the airline before you travel.