| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Dec 19 | SJC | SEA | 22:57 | 00:55 |
Delayed
|
Track > |
| Dec 18 | SJC | SEA | 20:41 | 22:25 |
Landed
|
Track > |
| Dec 17 | SJC | SEA | 19:55 | 21:58 |
Landed
|
Track > |
| Dec 16 | SJC | SEA | 20:10 | 22:08 |
Landed
|
Track > |
| Dec 15 | SJC | SEA | 20:01 | 21:54 |
Landed
|
Track > |
| Dec 14 | SJC | SEA | 20:00 | 22:04 |
Landed
|
Track > |
| Dec 13 | SJC | SEA | 19:46 | 21:25 |
Landed
|
Track > |
| Dec 12 | SJC | SEA | 20:06 | 22:00 |
Landed
|
Track > |
| Dec 11 | SJC | SEA | 20:20 | 22:18 |
Landed
|
Track > |
| Dec 10 | SJC | SEA | 21:12 | 23:00 |
Delayed
|
Track > |
Delta Air Lines Flight DL3999 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 DL3999 flight from San Jose to Seattle?
The average flight time from San Jose to Seattle is 1 hour and 53 minutes. The flight distance is 1122 km / 697 miles and the average flight speed is 594 km/h / 369 mph.
What is the On-Time Performance (OTP) of Delta Air Lines Flight DL3999 San Jose to Seattle?
The Airportia On-Time Performance Rating for Delta Air Lines Flight DL3999 is 4.6/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest DL3999 flight?
The latest flight took off on Saturday, December 20th, 2025 with the flight status being En-Route on 00:55.
How else can the flight DL3999 be referenced as?
This Delta Air Lines flight can also be referenced as DAL3999, DL 3999, DAL 3999.
How often is flight DL3999 delayed?
On average, 40% of all DL3999 flights are delayed. The average delay is 56 minutes.
Can I get compensation for my delayed or cancelled DL3999 flight or baggage issues?
If your DL3999 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 DL3999 Flight Tracker above for more details.
Claim compensation for your flight delay or cancellation!
Flight delays happen, but that doesn’t mean you have to accept them. You may be entitled to as much as 600€ in compensation if your flight has been delayed, cancelled or overbooked within the last three years. Claim Compensation Now >
Other flights departing from San Jose SJC: WN2761, WN3409, WN588, AS483
Other flights arriving at Seattle SEA: DL317, DL1406, DL945, WN3409
All flights connecting San Jose SJC to Seattle SEA.
