| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jul 30 | SEA | SNA | 13:54 | 16:55 |
Scheduled
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| Jul 29 | SEA | SNA | 14:09 | 16:33 |
Landed
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| Jul 28 | SEA | SNA | 14:19 | 16:43 |
Landed
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| Jul 27 | SEA | SNA | 16:02 | 18:29 |
Delayed
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| Jul 26 | SEA | SNA | 15:07 | 17:50 |
Delayed
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| Jul 25 | SEA | SNA | 14:26 | 17:00 |
Landed
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| Jul 24 | SEA | SNA | 14:31 | 17:01 |
Landed
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| Jul 23 | SEA | SNA | 14:28 | 16:54 |
Landed
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| Jul 22 | SEA | SNA | 14:24 | 16:50 |
Landed
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| Jul 21 | SEA | SNA | 14:31 | 17:23 |
Landed Late
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Delta Air Lines Flight DL3999 connects Seattle, United States to Orange County, United States, taking off from Seattle Tacoma International Airport SEA and landing at Orange County John Wayne Airport SNA.
How long is the DL3999 flight from Seattle to Orange County?
The average flight time from Seattle to Orange County is 2 hours and 31 minutes. The flight distance is 1576 km / 979 miles and the average flight speed is 615 km/h / 382 mph.
What is the On-Time Performance (OTP) of Delta Air Lines Flight DL3999 Seattle to Orange County?
The Airportia On-Time Performance Rating for Delta Air Lines Flight DL3999 is 4.7/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight DL3999 arriving at?
Flight DL3999 arrives at Orange County John Wayne Airport (SNA) Terminal A.
When was the latest DL3999 flight?
The latest flight took off on Thursday, July 30th, 2026 with the flight status being Scheduled on 16:55.
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, 50% of all DL3999 flights are delayed. The average delay is 37 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 4 airlines using the flight numbers AM4592, KE3091, KL7830, WS8104
Other flights departing from Seattle SEA: WN4956, AS2311, AS2131, AS2191
Other flights arriving at Orange County SNA: G41591, G43533, WN3712, WN3833
All flights connecting Seattle SEA to Orange County SNA.