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DL3991 Flight Information & Schedule

Delta Air Lines · San Francisco International Airport (SFO) to Seattle–Tacoma International Airport (SEA)

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DL3991 San Francisco International Airport to Seattle–Tacoma International Airport nonstop flight: schedule, airports, aircraft and travel guide.

DL3991 Flight Overview

DL3991 is operated by SkyWest DBA Delta Connection and connects San Francisco International Airport (SFO) and Seattle–Tacoma International Airport (SEA). Scheduled departure: 2026-10-29 20:58 (UTC-07:00); scheduled arrival: 2026-10-29 23:13 (UTC-07:00).

AirlineDelta Air Lines
Flight numberDL3991
RouteSFO to SEA
Scheduled duration2 hr 15 min

San Francisco to Seattle Route Information

DL3991 is a nonstop flight from San Francisco International Airport (SFO) to Seattle–Tacoma International Airport (SEA). Use the information below to plan your journey.

Route distanceApprox. 1,091 km
Scheduled flight time2 hr 15 min
Time difference0 min
Flight typenonstop
01

Departure

Scheduled departure: 2026-10-29 20:58 (UTC-07:00). Confirm airport transport and terminal opening hours in advance.

02

Arrival

Scheduled arrival: 2026-10-29 23:13 (UTC-07:00). Arrange pickup, hotel and onward transport for the arrival date.

03

Time zones

Departure: San Francisco (UTC-07:00); arrival: Seattle (UTC-07:00).

DL3991 On-time Performance & History

Methodology

90%Arrival on-time rate
Sample flights90 (flights)
Average departure delay34 min
Average arrival early4 min
Cancllation rate0%
Longest delay-
Early arrivals60%

Historical statistics are for reference only and do not predict future flight performance.

Aircraft, Cabin & Services

Based on currently published aircraft and cabin information; the operating aircraft may change.

Published aircraft type

Embraer 175

Economy 31 in; Business 37 in

Seat layout76

Business 12 · Economy 64

Business Class1-2

37 in

Seat configuration depends on the operating aircraft

Economy Class2-2

31 in

MealsComplimentary snacks and drinks on flights over 250 miles; meals on long-haul international

Inflight entertainmentIn-flight entertainment is unavailable

Inflight Wi-FiWi-Fi (additional charge)

Availability and fees depend on the flight

PowerBusiness: USB port and power outlet; Economy: Power outlet

BassinetAvailable

Accessibility-

DL3991 Airports

Terminals follow the published schedule; check official airline channels for same-day gates and operations.

San Francisco International Airport Departure & Seattle–Tacoma International Airport Arrival Guide

Departure date: 2026-10-29. Terminal and arrival information helps plan your journey.

SFO

Departing from San Francisco International Airport

DL3991 is scheduled to depart from T1. Allow time for international check-in, baggage drop, security and immigration.

SEA

Arriving at Seattle–Tacoma International Airport

Scheduled arrival is at . After immigration, take the MRT, taxi, ride-hailing service or airport bus to the city.

 

Planning your arrival

Scheduled arrival: 2026-10-29 23:13. Use the arrival date when booking hotels and pickup services.

Flight Changes, Cancellations & Missed Flights

If the schedule or aircraft changes, follow the booking channel and operating carrier rules.

01

Schedule changes

After an airline or booking-platform notice, confirm the new date, terminal and connecting transport.

02

Cancellation and changes

Refund, rebooking and involuntary-change rules depend on the booking channel, fare conditions and airline notice.

03

Missed flight

If you may not reach the airport on time, contact the booking channel or airline quickly to protect later sectors.

Check-in, Baggage & Entry Tips

International check-in deadlines, baggage allowance and entry requirements may vary by fare and traveller.

01

Arrive early for check-in

Arrive at least 3 hours before departure. Counter opening times and online check-in rules follow San Francisco International Airport guidance.

02

Check baggage allowance

Checked and carry-on baggage allowances depend on cabin, fare rules and membership tier. See the baggage terms in your booking.

03

Prepare entry documents

Before departure, check passport validity, visa or visa-free eligibility, andSeattle–Tacoma International Airport’ latest arrival declaration requirements.

What should I check before flying DL3991?

01

Check the departure date

For an overnight flight, check the departure date on your ticket and plan airport transport in advance.

02

Confirm the operating carrier

Follow the airline rules shown in your booking for check-in and checked baggage.

03

Check boarding information

Gates and operating times may change; follow airline notices and airport displays.

Popular route recommendations

DL3991 Frequently Asked Questions

Which airline operates this flight?

DL3991 is operated by Delta Air Lines.

Where does it depart and arrive?

San Francisco International Airport (SFO) → Seattle–Tacoma International Airport (SEA).

What are the departure and arrival times?

Scheduled departure 20:58, arrival 23:13 · 2 hours 15 minutes.

Which terminal is used for check-in?

Departure terminal T1, arrival terminal No data. Check-in, gate and baggage belt are announced on the day.

Are meals and inflight entertainment available?

Meals: Complimentary snacks and drinks on flights over 250 miles; meals on long-haul international. Inflight entertainment: In-flight entertainment is unavailable.

Explore This Route

Departure airportFlights from San Francisco International Airport
Arrival airportSeattle–Tacoma International Airport information
Operating airlineSkyWest DBA Delta Connection information