| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jul 18 | SNA | SEA | 18:13 | 20:39 |
Landed
|
Track > |
| Jul 17 | SNA | SEA | 18:25 | 20:43 |
Landed
|
Track > |
| Jul 16 | SNA | SEA | 17:36 | 20:29 |
Cancelled
|
Track > |
| Claim > | ||||||
| Jul 15 | SNA | SEA | 19:10 | 21:21 |
Delayed
|
Track > |
| Jul 14 | SNA | SEA | 18:01 | 20:09 |
Landed
|
Track > |
| Jul 13 | SNA | SEA | 17:43 | 19:52 |
Landed
|
Track > |
| Jul 12 | SNA | SEA | 17:53 | 20:03 |
Landed
|
Track > |
| Jul 11 | SNA | SEA | 17:50 | 20:05 |
Landed
|
Track > |
| Jul 10 | SNA | SEA | 17:57 | 20:08 |
Landed
|
Track > |
| Jul 09 | SNA | SEA | 19:03 | 21:24 |
Delayed
|
Track > |
Delta Air Lines Flight DL3999 connects Orange County, United States to Seattle, United States, taking off from Orange County John Wayne Airport SNA and landing at Seattle Tacoma International Airport SEA.
How long is the DL3999 flight from Orange County to Seattle?
The average flight time from Orange County to Seattle is 2 hours and 14 minutes. The flight distance is 1576 km / 979 miles and the average flight speed is 689 km/h / 428 mph.
How many DL3999 flights are operated per week?
7 flights per week. The flight DL3999 is operated on Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.
What is the On-Time Performance (OTP) of Delta Air Lines Flight DL3999 Orange County to Seattle?
The Airportia On-Time Performance Rating for Delta Air Lines Flight DL3999 is 4.8/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest DL3999 flight?
The latest flight took off on Sunday, July 19th, 2026 with the flight status being Landed on 20:39.
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 32 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.
Flight DL3999 is code-shared by 1 airline using the flight number VS4675
Other flights departing from Orange County SNA: DL1277, AS3248, AS774, WN3853
Other flights arriving at Seattle SEA: AS572, AS569, AS412, DL2640
All flights connecting Orange County SNA to Seattle SEA.