Departure
Scheduled departure: 2026-10-29 19:56 (UTC-07:00). Confirm airport transport and terminal opening hours in advance.
DL3987 Seattle–Tacoma International Airport to Ontario International Airport nonstop flight: schedule, airports, aircraft and travel guide.
DL3987 Flight Overview
DL3987 is operated by SkyWest DBA Delta Connection and connects Seattle–Tacoma International Airport (SEA) and Ontario International Airport (ONT). Scheduled departure: 2026-10-29 19:56 (UTC-07:00); scheduled arrival: 2026-10-29 22:43 (UTC-07:00).
AirlineDelta Air Lines
Flight numberDL3987
RouteSEA to ONT
Scheduled duration2 hr 47 min
Seattle to Ontario Route Information
DL3987 is a nonstop flight from Seattle–Tacoma International Airport (SEA) to Ontario International Airport (ONT). Use the information below to plan your journey.
Route distanceApprox. 1,538 km
Scheduled flight time2 hr 47 min
Time difference0 min
Flight typenonstop
Arrival
Scheduled arrival: 2026-10-29 22:43 (UTC-07:00). Arrange pickup, hotel and onward transport for the arrival date.
Time zones
Departure: Seattle (UTC-07:00); arrival: Ontario (UTC-07:00).
DL3987 On-time Performance & History
Methodology
Arrival on-time rate
Sample flights-
Average departure delay-
Average arrival early-
Cancllation rate-
Longest delay-
Early arrivals-
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
32 inches
Seat configuration depends on the operating aircraft
Availability and fees depend on the flight
DL3987 Airports
Terminals follow the published schedule; check official airline channels for same-day gates and operations.
SEASeattle–Tacoma International Airport
Seattle, United States · UTC-07:00
- Departure terminal
- Check-in counter
- Announced on the day
ONTOntario International Airport
Ontario · UTC-07:00
- Arrival terminal
- Baggage belt
- Announced on the day
Seattle–Tacoma International Airport Departure & Ontario International Airport Arrival Guide
Departure date: 2026-10-29. Terminal and arrival information helps plan your journey.
Departing from Seattle–Tacoma International Airport
DL3987 is scheduled to depart from . Allow time for international check-in, baggage drop, security and immigration.
Arriving at Ontario 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 22:43. 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.
Schedule changes
After an airline or booking-platform notice, confirm the new date, terminal and connecting transport.
Cancellation and changes
Refund, rebooking and involuntary-change rules depend on the booking channel, fare conditions and airline notice.
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.
Arrive early for check-in
Arrive at least 3 hours before departure. Counter opening times and online check-in rules follow Seattle–Tacoma International Airport guidance.
Check baggage allowance
Checked and carry-on baggage allowances depend on cabin, fare rules and membership tier. See the baggage terms in your booking.
Prepare entry documents
Before departure, check passport validity, visa or visa-free eligibility, andOntario International Airport’ latest arrival declaration requirements.
What should I check before flying DL3987?
Check the departure date
For an overnight flight, check the departure date on your ticket and plan airport transport in advance.
Confirm the operating carrier
Follow the airline rules shown in your booking for check-in and checked baggage.
Check boarding information
Gates and operating times may change; follow airline notices and airport displays.
Popular route recommendations
DL3987 Frequently Asked Questions
Which airline operates this flight?
DL3987 is operated by Delta Air Lines.
Where does it depart and arrive?
Seattle–Tacoma International Airport (SEA) → Ontario International Airport (ONT).
What are the departure and arrival times?
Scheduled departure 19:56, arrival 22:43 · 2 hours 47 minutes.
Which terminal is used for check-in?
Departure terminal No data, arrival terminal No data. Check-in, gate and baggage belt are announced on the day.
Are meals and inflight entertainment available?
No data
Explore This Route
Departure airportFlights from Seattle–Tacoma International Airport
Arrival airportOntario International Airport information
Operating airlineSkyWest DBA Delta Connection information