United Airlines UA639 Flight Status
Based on Trip.com’s real-time data, the UA639 flight operated by United Airlines on Oct 23, 2026 is scheduled to fly from Boston (BOS) to Los Angeles (LAX). The flight is expected to depart at 18:40 (local time in Boston, UTC-4) and land at 21:21 (local time in Los Angeles, UTC-7) .
Thu, Oct 22
Fri, Oct 23
Sat, Oct 24
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En route
Your flight has departed Boston and is expected to arrive in Los Angeles at 21:47.
6h 15m
Check-in Counter
--
Boarding Gate
B27
Arrival Gate
75A
Baggage
3
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Scheduled
Your flight will depart on time.
6h 15m
Check-in Counter
--
Boarding Gate
B23
Arrival Gate
84
Baggage
3
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Scheduled
Your flight will depart on time.
1h 22m
Check-in Counter
--
Boarding Gate
--
Arrival Gate
--
Baggage
--
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Search flights Information provided by VariFlight For the latest updates, please refer to airport announcements or consult your airline. You can also explore more flights from Boston to Los Angeles or track other flights with our flight status tracker.
Track the Previous Flight Status: Scheduled
UA1783
|
Los Angeles (LAX)
Boston (BOS)
Boston (BOS)
Scheduled: 17:31
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UA639 Aircraft Details
According to Trip.com real-time data, the UA639 flight flying from Boston to Los Angeles on 10/23/2026 is operated by the aircraft model Boeing 737-900. This aircraft has been in service for 4m. The aircraft is equipped with 179 seats.
Boeing 737-900
Punctuality (Departure)
10
%
Punctuality (Arrival)
53
%
Late on average
41 minutes
Age
4m
Seats
179
Distance
--
Economy
First
Premium Economy
Onboard Amenities
None
On-demand entertainment
Wi-Fi (additional charge)
Power outlet
Seating Plan
--
Legroom
--
Seat width
100°
Reclining Angle
3-3
Seat layout example
Onboard Amenities
Meal included
On-demand entertainment
Wi-Fi (additional charge)
Power outlet
Seating Plan
94 cm
Legroom
51 cm
Seat width better than on 24% of flights
120°
Reclining Angle
2-2
Seat layout example
Onboard Amenities
None
Entertainment available, please bring your own device
Wi-Fi is available
Power outlet
Seating Plan
--
Legroom
--
Seat width
105°
Reclining Angle
--
Seat layout example
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Flight History for UA639
Trip.com historical records show that the last UA639 flight departed on Thu, Oct 22 from BOS at approximately 19:04. This flight is expected to arrrive in LAX at 21:47.
| Date | Airport | Aircraft Type | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Departure | Arrival | |||||
| Sun, Oct 18 | Boston (BOS) | Los Angeles (LAX) | B39M | 19:32 | 21:57 | Arrived |
| Mon, Oct 19 | Boston (BOS) | Los Angeles (LAX) | B39M | 19:09 | 21:41 | Arrived |
| Tue, Oct 20 | San Francisco (SFO) | Santa Barbara (SBA) | 319 | 17:17 | 18:13 | Arrived |
| Wed, Oct 21 | Boston (BOS) | Los Angeles (LAX) | B39M | 18:57 | 21:37 | Arrived |
| Thu, Oct 22 | Boston (BOS) | Los Angeles (LAX) | B39M | 19:04 | 21:47 | En route |
| Fri, Oct 23 | Boston (BOS) | Los Angeles (LAX) | B39M | 18:40 | 21:21 | Scheduled |
| Sat, Oct 24 | San Francisco (SFO) | Santa Barbara (SBA) | 320 | 16:10 | 17:32 | Scheduled |
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UA639 On-Time Performance
Based on the average performance of this flight over the past 30 trips, the on-time departure rate of UA639 is 10% (Late on average 1 hour20 minutes), and the on-time arrival rate is 53% (Late on average 41 minutes).
On-Time Departures
Punctuality
10
%
Late on average
1 hour20 minutes
Early
0
%
On time
10
%
30 mins late
43
%
60 mins late
27
%
90 mins late
20
%
Cancelled
0
%
On-Time Arrivals
Punctuality
53
%
Late on average
41 minutes
Early
20
%
On time
33
%
30 mins late
27
%
60 mins late
3
%
90 mins late
17
%
Cancelled
0
%
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Frequently Asked Questions
What is the current status of flight ua639?
Flight ua639 has not departed yet and is currently on schedule. Scheduled departure 18:40, arrival 21:55 (updated Oct 23, 2026).Is flight ua639 on time today?
Flight ua639 has not departed yet and is currently on schedule. Scheduled departure is 18:40, with arrival at 21:55. Recheck gate and timing before you head to the airport.Has flight ua639 departed yet? What is the departure time?
Flight ua639 is scheduled to depart at 18:40. The latest actual or estimated departure time is 18:40, and the current status is Scheduled (updated Oct 23, 2026).When is flight ua639 scheduled to arrive?
Flight ua639 is scheduled to arrive at 21:55. The latest estimated or actual arrival time is 21:21. Status is Scheduled as of Oct 23, 2026.What is the gate information for flight ua639?
For flight ua639, the departure terminal is B and the boarding gate is B23. Gate assignments can change at short notice—confirm on airport screens before heading to security.What is the baggage carousel number for flight ua639?
After arrival, baggage for flight ua639 is expected at carousel 3 in terminal T7. Carousel numbers are assigned close to landing and may change—follow airport signs on arrival.What route does flight ua639 fly?
Flight ua639 is operated by United Airlines from Boston (BOS) to Los Angeles (LAX). Typical flight time is about 6 hours15 minutes; operating days may include Friday.How can I check real-time status for flight ua639?
Track flight ua639 on this Trip.com status page for live departure, arrival, gate and baggage updates. For push alerts on the go, open the same flight in the Trip.com App and turn on flight notifications.If flight ua639 is delayed or canceled, what should I do?
If ua639 is delayed or canceled, first confirm the latest status here (Scheduled, updated Oct 23, 2026). Contact United Airlines or your booking channel for rebooking or refund options, and check Trip.com Manage Booking if you booked on Trip.com.Has flight ua639 departed from Boston?
Flight ua639 has not departed from Boston (BOS) yet and is currently on schedule for 18:40.What is the seat configuration for flight ua639?
Flight ua639 usually flies a Boeing 737-900 with seat layout 3-3. Layouts can differ by aircraft subtype and cabin product—confirm your seat map in Manage Booking after you purchase.
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Destination Info: Los Angeles Weather & Time
Partly clear with thunder and rain
|
14°C - 21°C
Expected weather conditions upon arrival
-3 hour time difference
Time on arrival: Boston 00:21
|
Los Angeles 21:21
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