DL3999 Delta Air Lines - Flight Status

Which is the frequency of flight DL3999?
The flight DL3999 is scheduled to flight on Monday, Tuesday, Wednesday, Thursday, Friday on a weekly basis.

Which is the distance of flight DL3999?
The distance between the two airports is 979 miles.

Are the departure airport and arrival airport at the same Time Zone?
Yes, both airports are in the same timezone.

The following airlines serves the same route between Seattle and Santa Ana:

Alaska Airlines
- Flight Number: AS1357. (On Time performance: 83 - Average Delay: 12 minutes)
- Flight Number: AS1387. (On Time performance: 96 - Average Delay: 2 minutes)
- Flight Number: AS269. (On Time performance: 81 - Average Delay: 6 minutes)
- Flight Number: AS699. (On Time performance: 94 - Average Delay: 4 minutes)
- Flight Number: AS759. (On Time performance: 86 - Average Delay: 8 minutes)
- Flight Number: AS773. (On Time performance: 90 - Average Delay: 9 minutes)
- Flight Number: AS792. (On Time performance: 81 - Average Delay: 7 minutes)

Delta Air Lines
- Flight Number: DL1105. (On Time performance: 84 - Average Delay: 23 minutes)
- Flight Number: DL2101. (On Time performance: 84 - Average Delay: 12 minutes)
- Flight Number: DL2318. (On Time performance: 80 - Average Delay: 22 minutes)

It is not possible to calculate the On-Time Performance for this flight accurately due to insufficient or non-representative data, as doing so could lead to misleading conclusions.

Delays analyzed by Weekday: We have gathered available data from last six months, spanning from October 14, 2025 to April 13, 2026. Next, you can observe the results broken down by day of the week: number of flights analyzed, on-time performance per day, and average delay per day.

Delays analyzed by Month: We have gathered available data from last twelve closed months, spanning from October 06, 2025 to December 19, 2025. Next, you can observe the results broken down by month: number of flights analyzed, on-time performance per month, and average delay per month.