Direct (non-stop) flights from SeaTac (SEA) to Washington (IAD)
Find comprehensive flight information, schedules, and booking details for direct flights from SeaTac (SEA) to Washington (IAD). This popular route is operated by 3 airlines, offering multiple daily departures.• Flight Duration: 4h 50m - 5h 17m (average flight time)• Distance: 2313 miles (3722 km) (air miles between airports)• Daily Flights: 3-6 flights (scheduled departures per day)
SeaTac (SEA)
Washington (IAD)
FLIGHT TIME
4h 50m - 5h 17m
FLIGHT DISTANCE
2313 miles (3722 km)
4h 54m - 5h 7m
08:00
22:20
2313 miles (3722 km)
January
3 (Show)
30
Flight Schedule
December 2025
Airlines with direct flights from SeaTac (SEA) to Washington (IAD)
Route Insights
Duration variability: Flight duration on this route can vary based on aircraft type, wind conditions, and airline scheduling. Average duration is 4h 50m - 5h 17m.
Pricing patterns: January typically offers lower prices due to reduced demand outside peak travel seasons.
Best departure times: Peak departure times are 8:00, 9:00, 16:00, offering more flight options and potentially better connections.
SeaTac (SEA) - Washington (IAD) flight price statistics
$413
ApproximateThe numbers are average prices found based on user searches for direct flights between the airports. It's calculated from the cheapest prices found per month for a round-trip with 1 adult and can vary depending on the amount of data we have for this particular route.
$236
Jan$409
Feb$346
Mar$355
Apr$357
May$678
Jun$688
Jul$597
Aug$326
Sep$266
Oct$266
Nov$435
DecRelated Information
Airports: SEA • IAD Airport
Airlines operating this route: United Airlines (UA), Alaska Airlines, Delta Air Lines
Frequently Asked Questions
How many flights operate from SEA to IAD?
There are 4 direct flights operating from SEA to IAD. Approximately 3-6 flights daily.
Which airlines operate flights from SEA to IAD?
3 airlines operate on this route: United Airlines, Alaska Airlines, Delta Air Lines.
How long is the flight from SEA to IAD?
The flight duration from SEA to IAD is approximately 4h 50m - 5h 17m.
What is the distance from SEA to IAD?
The distance from SEA to IAD is 2313 miles (3722 km).
What is the flight time range for this route?
Flight times on this route range from 4h 54m - 5h 7m.
What are the earliest and latest flight departure times?
The earliest flight departs at 08:00 and the latest flight departs at 22:20.
What is the cheapest month to fly from SEA to IAD?
January is typically the cheapest month to fly on this route.
How many flights operate per week on this route?
Approximately 30 flights operate per week from SEA to IAD.
What types of aircraft operate on this route?
This route is served by Boeing 737-800 Passenger, Boeing 737-900 (winglets) Passenger/BBJ3, Airbus A220-300, Boeing 737MAX 9 Passenger.
What is the average flight price from SEA to IAD?
The average flight price for a round-trip ticket from SEA to IAD is approximately $413 USD. Prices can vary based on booking time, season, and airline.
When is the best time to book flights from SEA to IAD for the lowest prices?
January is typically the cheapest month to fly from SEA to IAD. Booking in advance and avoiding peak travel seasons can help you find better deals.
How many airlines offer flights from SEA to IAD?
3 airlines offer direct flights from SEA to IAD, providing travelers with multiple options for scheduling and pricing.
How far is IAD from SEA?
The distance from SEA to IAD is 2313 miles (3722 km). This is a long-haul flight route.
How long does it take to fly from SEA to IAD?
The flight time from SEA to IAD is approximately 4h 50m - 5h 17m. Actual flight duration may vary based on weather conditions, aircraft type, and routing.