| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Aug 18 | SJC | SEA | 14:18 | 16:00 |
Landed
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| Aug 17 | SJC | SEA | 14:14 | 15:46 |
Landed
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| Aug 16 | SJC | SEA | 14:23 | 16:04 |
Landed
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| Aug 15 | SJC | SEA | 14:25 | 16:04 |
Landed
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| Aug 14 | SJC | SEA | 14:27 | 16:13 |
Landed
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| Aug 13 | SJC | SEA | 14:22 | 15:56 |
Landed
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| Aug 12 | SJC | SEA | 14:20 | 15:57 |
Landed
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| Aug 11 | SJC | SEA | 14:30 | 16:06 |
Landed
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| Aug 10 | SJC | SEA | 15:33 | 17:14 |
Landed Late
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| Aug 09 | SJC | SEA | 15:21 | 16:58 |
Landed Late
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Alaska Airlines Flight AS521 connects San Jose, United States to Seattle, United States, taking off from San Jose International Airport SJC and landing at Seattle Tacoma International Airport SEA.
How long is the AS521 flight from San Jose to Seattle?
The average flight time from San Jose to Seattle is 1 hour and 38 minutes. The flight distance is 1122 km / 697 miles and the average flight speed is 684 km/h / 425 mph.
What is the On-Time Performance (OTP) of Alaska Airlines Flight AS521 San Jose to Seattle?
The Airportia On-Time Performance Rating for Alaska Airlines Flight AS521 is 4.9/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest AS521 flight?
The latest flight took off on Tuesday, August 18th, 2026 with the flight status being Landed on 16:00.
How else can the flight AS521 be referenced as?
This Alaska Airlines flight can also be referenced as ASA521, AS0521, AS 521, ASA 521.
How often is flight AS521 delayed?
On average, 20% of all AS521 flights are delayed. The average delay is 39 minutes.
Can I get compensation for my delayed or cancelled AS521 flight or baggage issues?
If your AS521 flight was cancelled, delayed, or if you experienced baggage issues such as delayed, damaged, or lost bags, you may be entitled to compensation. Compensation amounts and eligibility depend on various regulations, including EC 261/2004, UK261, CA Montreal Convention, US GoodWill, BR-ANAC, SA-GACA and TK-SHY.
See our AS521 Flight Tracker above for more details.
Flight AS521 is code-shared by 2 airlines using the flight numbers DE5213, FI7666
Other flights departing from San Jose SJC: SY8723, WN3088, AS1633, WN1765
Other flights arriving at Seattle SEA: SY8701, AS286, OO3345, OO3408
All flights connecting San Jose SJC to Seattle SEA.