DL3991 Delta Air Lines - Flight Status

Which is the frequency of flight DL3991?
The flight DL3991 is scheduled to flight on daily basis.

Which is the distance of flight DL3991?
The distance between the two airports is 679 miles.

Which is the flight time of flight DL3991?
The scheduled flight time gate to gate is: 02:15 hours.
The real flight time gate to gate on average is: 02:23 hours.

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 San Francisco:

Alaska Airlines
- Flight Number: AS1050. (On Time performance: 64 - Average Delay: 26 minutes)
- Flight Number: AS1082. (On Time performance: 62 - Average Delay: 15 minutes)
- Flight Number: AS1112. (On Time performance: 67 - Average Delay: 15 minutes)
- Flight Number: AS1132. (On Time performance: 69 - Average Delay: 15 minutes)
- Flight Number: AS1140. (On Time performance: 52 - Average Delay: 33 minutes)
- Flight Number: AS1166. (On Time performance: 74 - Average Delay: 15 minutes)
- Flight Number: AS1284. (On Time performance: 57 - Average Delay: 25 minutes)
- Flight Number: AS1385.
- Flight Number: AS528.
- Flight Number: AS590. (On Time performance: 78 - Average Delay: 22 minutes)
- Flight Number: AS655.
- Flight Number: AS680.
- Flight Number: AS688. (On Time performance: 64 - Average Delay: 23 minutes)
- Flight Number: AS708. (On Time performance: 60 - Average Delay: 45 minutes)
- Flight Number: AS725.

Delta Air Lines
- Flight Number: DL1412. (On Time performance: 71 - Average Delay: 28 minutes)
- Flight Number: DL2635. (On Time performance: 75 - Average Delay: 14 minutes)
- Flight Number: DL2636. (On Time performance: 67 - Average Delay: 11 minutes)
- Flight Number: DL3636. (On Time performance: 87 - Average Delay: 8 minutes)
- Flight Number: DL3707. (On Time performance: 85 - Average Delay: 7 minutes)

United Airlines
- Flight Number: UA1116.
- Flight Number: UA1333. (On Time performance: 68 - Average Delay: 29 minutes)
- Flight Number: UA1424.
- Flight Number: UA1482. (On Time performance: 77 - Average Delay: 13 minutes)
- Flight Number: UA2482. (On Time performance: 77 - Average Delay: 13 minutes)
- Flight Number: UA2632.
- Flight Number: UA2640. (On Time performance: 81 - Average Delay: 16 minutes)
- Flight Number: UA325. (On Time performance: 98 - Average Delay: 2 minutes)
- Flight Number: UA5657. (On Time performance: 100 - Average Delay: 1 minutes)
- Flight Number: UA737. (On Time performance: 61 - Average Delay: 21 minutes)

We have gathered data from recent months and present below an analysis of how timely the flights have been.

Delays analyzed by Weekday: We have gathered available data from last six months, spanning from June 08, 2025 to October 24, 2025. 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 June 08, 2025 to September 30, 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.