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UAL521

IAH → BOS · Boeing 737 MAX 9 · United Airlines

For travellers

Departure · Houston (IAH)

Terminal C · Gate C9
Scheduled 01 Oct 18:35 · Departed 01 Oct 19:04 · +29 min
Board status: Departed
Airborne since 01 Oct 19:38 (ADS-B)

Arrival · Boston (BOS)

Terminal B · Gate B23 · Baggage belt 6
Scheduled 01 Oct 23:39 · Landed 01 Oct 23:58 · +19 min
Board status: Arrived
Landed 01 Oct 23:58 (airport data)

Board data from bos, houston, updated 435 min ago; times local to each airport.

Flight

Status
Completed (landing confirmed by airport data)
Arrival confirmed via
Airport data (confirmed)
Departure
George Bush Intercontinental Houston Airport (IAH) — Houston, United States
Scheduled departure
2026-10-01 23:35 UTC
Departed
2026-10-02 00:38 UTC
Arrival
General Edward Lawrence Logan International Airport (BOS) — Boston, United States
Scheduled arrival
2026-10-02 03:39 UTC
Estimated arrival
2026-10-02 03:47 UTC
Also flies as
UA521
Distance flown
2769 km
Straight-line distance
2568 km

Aircraft

Registration
N37530
Type
Boeing 737 MAX 9
Seats
179 total (117 Economy, 42 Economy Plus, 20 First)
CO2 (EMEP est., total)
53.5 t (379 kg/pax Business, 289 kg/pax Economy)

Altitude & speed

Max altitude
35,025 ft
Max ground speed
535 kt
Tracked
3h 18m · 2,765 km
Altitude (ft, max 35,025)
018,91437,8270m30m1h 0m1h 30m2h 0m2h 30m3h 0m
Ground speed (kt, max 535)
02895780m30m1h 0m1h 30m2h 0m2h 30m3h 0m
Altitude (ft, max 35,025)
018,91437,8270m1h 0m2h 0m3h 0m
Ground speed (kt, max 535)
02895780m1h 0m2h 0m3h 0m

From the ADS-B positions we received; time since the first fix. A dashed stretch is a gap in reception, bridged by a straight line.

Route map

Airline

United Airlines (UAL)

Latest flights

DepartedFlightRouteRegAircraftStatusDistance
2026-10-02 00:38 UTC UAL521 IAH → BOS
Houston → Boston
 N37530 Boeing 737 MAX 9 Completed (landing confirmed by airport data) 2769 km
2026-09-30 23:54 UTC UAL521 IAH → BOS
Houston → Boston
 N47524 Boeing 737 MAX 9 Completed 2760 km
2026-09-30 00:40 UTC UAL521 IAH → BOS
Houston → Boston
 N37562 Boeing 737 MAX 9 Completed 2704 km
2026-09-29 03:14 UTC UAL521 IAH → BOS
Houston → Boston
 N37507 Boeing 737 MAX 9 Completed 2651 km
2026-09-28 03:23 UTC UAL521 IAH → BOS
Houston → Boston
 N47505 Boeing 737 MAX 9 Completed 2635 km
2026-09-26 13:46 UTC UAL521 IAH → MCO
Houston → Orlando
 N17289 Boeing 737 MAX 8 Completed 1436 km
2026-09-26 00:02 UTC UAL521 IAH → BOS
Houston → Boston
 N37415 Boeing 737 MAX 9 Completed 2654 km
2026-09-25 01:50 UTC UAL521 IAH → BOS
Houston → Boston
 N47505 Boeing 737 MAX 9 Completed 2647 km
2026-09-24 01:11 UTC UAL521 IAH → BOS
Houston → Boston
 N17433 Boeing 737 MAX 9 Completed 2701 km
2026-09-23 00:01 UTC UAL521 IAH → BOS
Houston → Boston
 N27546 Boeing 737 MAX 9 Completed 2752 km
2026-09-22 00:03 UTC UAL521 IAH → BOS
Houston → Boston
 N17431 Boeing 737 MAX 9 Completed 2771 km
2026-09-21 00:39 UTC UAL521 IAH → BOS
Houston → Boston
 N77587 Boeing 737 MAX 9 Completed 2758 km
2026-09-19 23:45 UTC UAL521 IAH → BOS
Houston → Boston
 N37577 Boeing 737 MAX 9 Completed 2824 km
2026-09-19 00:11 UTC UAL521 IAH → BOS
Houston → Boston
 N17589 Boeing 737 MAX 9 Completed 2870 km
2026-09-18 01:18 UTC UAL521 IAH → BOS
Houston → Boston
 N77588 Boeing 737 MAX 9 Completed 2827 km
2026-09-17 00:06 UTC UAL521 IAH → BOS
Houston → Boston
 N77558 Boeing 737 MAX 9 Completed 2793 km
2026-09-15 23:46 UTC UAL521 IAH → BOS
Houston → Boston
 N37522 Boeing 737 MAX 9 Completed 2814 km
2026-09-14 23:52 UTC UAL521 IAH → BOS
Houston → Boston
 N27519 Boeing 737 MAX 9 Completed 2941 km
2026-09-14 01:59 UTC UAL521 IAH → BOS
Houston → Boston
 N37536 Boeing 737 MAX 8 Completed 2864 km
2026-09-12 23:53 UTC UAL521 IAH → BOS
Houston → Boston
 N27586 Boeing 737 MAX 9 Completed 2918 km
2026-09-11 23:45 UTC UAL521 IAH → BOS
Houston → Boston
 N57478 Boeing 737 MAX 9 Completed 2973 km
2026-09-11 00:03 UTC UAL521 IAH → BOS
Houston → Boston
 N37506 Boeing 737 MAX 9 Completed 2923 km
2026-09-10 00:00 UTC UAL521 IAH → BOS
Houston → Boston
 N17574 Boeing 737 MAX 9 Completed 2933 km
2026-09-08 00:03 UTC UAL521 IAH → BOS
Houston → Boston
 N27509 Boeing 737 MAX 9 Completed 2820 km
2026-09-07 03:23 UTC UAL521 IAH → BOS
Houston → Boston
 N37545 Boeing 737 MAX 9 Completed 2776 km
2026-09-05 23:50 UTC UAL521 IAH → BOS
Houston → Boston
 N37510 Boeing 737 MAX 9 Completed 2952 km
2026-09-04 23:51 UTC UAL521 IAH → BOS
Houston → Boston
 N27476 Boeing 737 MAX 9 Completed 3159 km
2026-09-04 00:29 UTC UAL521 IAH → BOS
Houston → Boston
 N27511 Boeing 737 MAX 9 Completed 2829 km
2026-09-03 00:04 UTC UAL521 IAH → BOS
Houston → Boston
 N17452 Boeing 737 MAX 9 Completed 2886 km
2026-09-02 00:23 UTC UAL521 IAH → BOS
Houston → Boston
 N75433 Boeing 737-900 Completed 3078 km
2026-08-31 23:47 UTC UAL521 IAH → BOS
Houston → Boston
 N37545 Boeing 737 MAX 9 Completed 2826 km
2026-08-31 00:31 UTC UAL521 IAH → BOS
Houston → Boston
 N17455 Boeing 737 MAX 9 Completed 2815 km
2026-08-29 23:53 UTC UAL521 IAH → BOS
Houston → Boston
 N47357 Boeing 737 MAX 8 Completed 2810 km
2026-08-29 00:10 UTC UAL521 IAH → BOS
Houston → Boston
 N27526 Boeing 737 MAX 9 Completed 2836 km
2026-08-28 00:08 UTC UAL521 IAH → BOS
Houston → Boston
 N57466 Boeing 737 MAX 9 Completed 3101 km
2026-08-26 23:49 UTC UAL521 IAH → BOS
Houston → Boston
 N57466 Boeing 737 MAX 9 Completed 2831 km
2026-08-25 23:48 UTC UAL521 IAH → BOS
Houston → Boston
 N27568 Boeing 737 MAX 9 Completed 2802 km
2026-08-24 23:55 UTC UAL521 IAH → BOS
Houston → Boston
 N17460 Boeing 737 MAX 9 Completed 2951 km
2026-08-24 02:19 UTC UAL521 IAH → BOS
Houston → Boston
 N37561 Boeing 737 MAX 9 Completed 2779 km
2026-08-22 23:56 UTC UAL521 IAH → BOS
Houston → Boston
 N47434 Boeing 737 MAX 9 Completed 4409 km
2026-08-22 01:57 UTC UAL521 IAH → BOS
Houston → Boston
 N27419 Boeing 737 MAX 9 Completed 4404 km
2026-08-21 00:02 UTC UAL521 IAH → BOS
Houston → Boston
 N17406 Boeing 737 MAX 9 Completed 3459 km
2026-08-20 00:17 UTC UAL521 IAH → BOS
Houston → Boston
 N37551 Boeing 737 MAX 9 Completed 3524 km
2026-08-18 23:49 UTC UAL521 IAH → BOS
Houston → Boston
 N17403 Boeing 737 MAX 9 Completed 3986 km
2026-08-18 00:39 UTC UAL521 IAH → BOS
Houston → Boston
 N27419 Boeing 737 MAX 9 Completed 3279 km
2026-08-16 23:52 UTC UAL521 IAH → BOS
Houston → Boston
 N17437 Boeing 737 MAX 9 Completed 4108 km
2026-08-15 18:55 UTC UAL521 LAX → BOS
Los Angeles → Boston
 N77584 Boeing 737 MAX 9 Completed 7272 km
2026-08-14 23:44 UTC UAL521 IAH → BOS
Houston → Boston
 N37506 Boeing 737 MAX 9 Completed ~6468 km est. (4111 km recorded)
2026-08-13 20:01 UTC UAL521 CUN → BOS
Cancún → Boston
 N37553 Boeing 737 MAX 9 Completed 4349 km
2026-08-12 19:04 UTC UAL521 EWR → CUN
Newark → Cancún
 N37553 Boeing 737 MAX 9 Completed ~12933 km est. (10093 km recorded)

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