How long is the CX7831 flight?

The timetable allows 6 h 24 min. Boston to Seattle is 4,005 km (2,489 mi).

Which terminal does CX7831 use?

It usually leaves from Terminal B, gate B4 at Boston Logan International Airport (BOS). Check the flight card above for today's terminal and gate.

What other flight numbers does CX7831 have?

Also listed as CPA7831 (Cathay Pacific's ICAO code) and CX 7831.

CX7831 Flight Status Cathay Pacific: Boston to Seattle (CPA7831)

Cathay Pacific CX 7831

Landed On Time

BOS Boston

Scheduled: 18:20
Actual: 18:49

Terminal: B | Gate: B4

Departure: Sun, Nov 8, 2026 · local time EST

Boston Logan International Airport (BOS)

All BOS Departures >

SEA Seattle

Scheduled: 21:44
Actual: 21:39
Delay

Gate: N2

Arrival: Sun, Nov 8, 2026 · local time PST

Seattle Tacoma International Airport (SEA)

All SEA Arrivals >

Landed 7h 39m ago 100%

BOS 18:49 SEA 21:39

4,005 km (2,489 mi) flown

Estimated position based on departure and arrival times, not live tracking. Times are local at each airport.

Add to calendar

Distance: 4005 km / 2489 miles · Scheduled Duration: 06:24 · Actual Duration: 05:50

CX 7831 Flight Status & Schedule Cathay Pacific Boston to Seattle

Date	From	To	Departure	Arrival	Status	Details
Nov 08	BOS	SEA	18:49	21:39	Landed	Track >
Nov 06	BOS	SEA	19:38	22:13	Landed Late	Track >
Nov 04	BOS	SEA	18:04	20:21	Landed	Track >
Nov 03	BOS	SEA	18:07	20:25	Landed	Track >
Nov 02	BOS	SEA	19:16	21:39	Landed	Track >
Nov 01	BOS	SEA	18:41	21:19	Landed	Track >

Cathay Pacific operates CX 7831 from Boston to Seattle, a 4,005 km (2,489 mi) trip, four times a week (Tuesday, Wednesday, Friday and Sunday). With 6 h 24 min in the timetable and a usual flight time of about 5 h 30 min, it often makes up time. Yesterday it left 29 minutes late and still landed at 21:39, 5 minutes early.

< All Boston BOS Departures All Seattle SEA Arrivals >

About CX 7831

Route: Boston Logan International Airport BOS to Seattle Tacoma International Airport SEA
Distance: 4,005 km (2,489 mi)
Typical flight time: 5 h 30 min
Flies: Tue, Wed, Fri, Sun
On time: 5 of the last 6
Average delay when late: 29 min
Usually departs from: Terminal B, gate B4

CX 7831 FAQ

How long is the CX7831 flight?: The timetable allows 6 h 24 min. Boston to Seattle is 4,005 km (2,489 mi).
How often is CX7831 late?: 1 of the last 6 flights arrived 15 or more minutes late; when late, by 29 minutes on average.
Which days does CX7831 fly?: Four times a week: Tuesday, Wednesday, Friday and Sunday, based on the schedule of the last 7 days.
Which terminal does CX7831 use?: It usually leaves from Terminal B, gate B4 at Boston Logan International Airport (BOS). Check the flight card above for today's terminal and gate.
What other flight numbers does CX7831 have?: Also listed as CPA7831 (Cathay Pacific's ICAO code) and CX 7831.

CX7831 and Boston BOS to Seattle SEA Flights

Flight CX7831 is a code-share Cathay Pacific flight of the Alaska Airlines operated AS257.

Other flights departing from Boston BOS: AS257, AF61, B62255

Other flights arriving at Seattle SEA: AS257, AS346

All flights connecting Boston BOS to Seattle SEA.