Airport Tips & Quick Reference Guide to Seattle–Tacoma Airport - Seatac (SEA)

AS100 Alaska Airlines - Flight Status

Below, you can find details about Alaska Airlines flight AS100, which currently operates between the airports of Seattle - Seattle-Tacoma International Airport (Airport Code SEA) and London - London Heathrow Airport (Airport Code LHR).
This flight data pertains specifically to the flight's details for Thursday, August 20, 2026.

AS100 On Time performance:
69
We have calculated the percentage of flights that arrived within 15 minutes of their scheduled time, or earlier, based on real flight data from the last 3 months. More about punctuality and delays

Flight Status

AS100 Alaska Airlines to London

En Route - On-time
Flight Status for Thursday August 20, 2026
This flight was also scheduled for Yesterday (August 19, 2026). See it here
This flight is also scheduled for Tomorrow (August 21, 2026). See it here

Airline information

Alaska Airlines
Alaska Airlines
Equipment: Boeing 787-9

Departure

Seattle (SEA)
August 20, 2026
Seattle-Tacoma International Airport
Departed at:
09:40 pm
Gate:
S7
Scheduled Departure Time: 09:40 pm

Arrival

London (LHR)
August 21, 2026
London Heathrow Airport
Estimated Arrival Time:
02:50 pm
Terminal:
3
Gate:
29
Scheduled Arrival Time: 03:05 pm
Disclaimer
The information displayed on this website is gathered from third-party providers with a wide reputation on the sector, which in turn obtain the information from the airlines. This data is provided only for informative purposes. www.seattle-airport.com assumes no responsibility for loss or damage as a result of relying on information posted here. Please contact your airline to verify flight status.

Additional Information

Which is the frequency of flight AS100?
The flight AS100 is scheduled to flight on daily basis.

Which is the distance of flight AS100?
The distance between the two airports is 4788 miles.

Which is the flight time of flight AS100?
The scheduled flight time gate to gate is: 09:25 hours.
The real flight time gate to gate on average is: 09:20 hours.

Are the departure airport and arrival airport at the same Time Zone?
No, each airport is in a different timezone. The times shown above, are presented in the local time of each respective airport.
Current Time in Seattle: 2026-08-20 22:46:50
Current Time in London: 2026-08-21 06:46:50

Alternative Flights

The following airlines serves the same route between Seattle and London:

British Airways
- Flight Number: BA48. (On Time performance: 61 - Average Delay: 26 minutes)
- Flight Number: BA52. (On Time performance: 68 - Average Delay: 11 minutes)

Delta Air Lines
- Flight Number: DL20. (On Time performance: 87 - Average Delay: 6 minutes)

Virgin Atlantic
- Flight Number: VS106. (On Time performance: 90 - Average Delay: 4 minutes)

Punctuality and delays

We have gathered data from recent months and present below an analysis of how timely the flights have been.

In terms of On-Time Performance, by analyzing the flight data from the last three months, spanning from May 21, 2026 to August 16, 2026, we have obtained these figures.
Total number of flights: 88
On Time: 61 ( 69 % )
Moderate Delay: 12 ( 14 % )
Significant Delay: 9 ( 10 % )
Major Delay: 6 ( 7 % )
Canceled: 0 ( 0 % )
Diverted: 0 ( 0 % )

Average Delay: 17 minutes.
Delays analyzed by Weekday: We have gathered available data from last six months, spanning from May 21, 2026 to August 16, 2026. Next, you can observe the results broken down by day of the week: number of flights analyzed, on-time performance per day, and average delay per day.

Delays analyzed by Month: We have gathered available data from last twelve closed months, spanning from May 21, 2026 to July 31, 2026. Next, you can observe the results broken down by month: number of flights analyzed, on-time performance per month, and average delay per month.

Last Past Flights AS100

Date
Departure
Arrival
Duration
Aircraft
Status
Thursday
20 August
09:37 pm
Seattle (SEA)
03:15 pm
London (LHR)
09h 38min
Boeing 787-9
Boeing 787-9
Landed - On-time
Wednesday
19 August
09:36 pm
Seattle (SEA)
03:00 pm
London (LHR)
09h 24min
Boeing 787-9
Boeing 787-9
Landed - On-time
Tuesday
18 August
09:57 pm
Seattle (SEA)
03:31 pm
London (LHR)
09h 34min
Boeing 787-9
Boeing 787-9
Landed - Delayed
Monday
17 August
09:39 pm
Seattle (SEA)
02:42 pm
London (LHR)
09h 03min
Boeing 787-9
Boeing 787-9
Landed - On-time
Sunday
16 August
09:49 pm
Seattle (SEA)
02:55 pm
London (LHR)
09h 06min
Boeing 787-9
Boeing 787-9
Landed - On-time
Saturday
15 August
10:01 pm
Seattle (SEA)
03:43 pm
London (LHR)
09h 42min
Boeing 787-9
Boeing 787-9
Landed - Delayed
Friday
14 August
10:26 pm
Seattle (SEA)
03:32 pm
London (LHR)
09h 06min
Boeing 787-9
Boeing 787-9
Landed - Delayed
Thursday
13 August
09:39 pm
Seattle (SEA)
03:05 pm
London (LHR)
09h 26min
Boeing 787-9
Boeing 787-9
Landed - On-time
Wednesday
12 August
09:35 pm
Seattle (SEA)
02:55 pm
London (LHR)
09h 20min
Boeing 787-9
Boeing 787-9
Landed - On-time
Tuesday
11 August
09:40 pm
Seattle (SEA)
03:01 pm
London (LHR)
09h 21min
Boeing 787-9
Boeing 787-9
Landed - On-time