| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Sep 02 | SNA | SEA | 18:02 | 20:50 |
Scheduled
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| Aug 28 | SNA | SEA | 18:02 | 20:50 |
Scheduled
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| Aug 20 | SNA | SEA | 18:02 | 20:50 |
Scheduled
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| Aug 02 | SNA | SEA | 17:36 | 20:29 |
Scheduled
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| Jul 29 | SNA | SEA | 17:45 | 20:08 |
Landed
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| Jul 28 | SNA | SEA | 17:36 | 19:55 |
Landed
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| Jul 27 | SNA | SEA | 19:38 | 21:50 |
Delayed
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| Jul 26 | SNA | SEA | 19:10 | 21:28 |
Delayed
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| Jul 25 | SNA | SEA | 17:48 | 20:00 |
Landed
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| Jul 24 | SNA | SEA | 17:58 | 20:13 |
Landed
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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 16 minutes. The flight distance is 1576 km / 979 miles and the average flight speed is 640 km/h / 397 mph.
How many DL3999 flights are operated per week?
2 flights per week. The flight DL3999 is operated on Thursday and Saturday.
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 Thursday, September 3rd, 2026 with the flight status being Scheduled on 20:50.
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, 20% of all DL3999 flights are delayed. The average delay is 70 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.
Other flights departing from Orange County SNA: OO3999, AS589, WN4576, UA2656
Other flights arriving at Seattle SEA: DL831, OO4031, DL3887, DL4031
All flights connecting Orange County SNA to Seattle SEA.