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Flights between Washington (IAD) and Seattle (SEA)

Washington Dulles International Airport, United States ↔ Seattle Tacoma International Airport, United States

A direct route between Washington and Seattle appears in the OpenFlights route network.

This reflects historical scheduled service and may be out of date — it is not a live timetable.

Airlines that have operated this route include:

United Airlines (UA)
Distance
3,702 km
2,300 miles
Est. flight time
5h 8m
great-circle estimate
Time difference
~3h
varies with DST
View this route on the live map →Search fares on Skyscanner ↗

Climate

Typical monthly temperatures in United States

Jan
4°
9/-1
70mm
Feb
6°
11/1
60mm
Mar
11°
16/6
75mm
Apr
17°
22/12
80mm
May
23°
28/18
95mm
Jun
28°
33/23
100mm
Jul
30°
35/25
95mm
Aug
29°
34/24
90mm
Sep
25°
30/20
80mm
Oct
18°
23/13
70mm
Nov
11°
16/6
70mm
Dec
5°
10/0
75mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Typical monthly temperatures in United States

Jan
4°
9/-1
70mm
Feb
6°
11/1
60mm
Mar
11°
16/6
75mm
Apr
17°
22/12
80mm
May
23°
28/18
95mm
Jun
28°
33/23
100mm
Jul
30°
35/25
95mm
Aug
29°
34/24
90mm
Sep
25°
30/20
80mm
Oct
18°
23/13
70mm
Nov
11°
16/6
70mm
Dec
5°
10/0
75mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Common questions

How far is Washington from Seattle?

Washington (IAD) and Seattle (SEA) are around 3,702 km (2,300 miles) apart — an estimated 5h 8m by air. Distances and flight times are great-circle estimates.

Which airlines have operated the IAD–SEA route?

Airlines recorded operating this route in the OpenFlights network include United Airlines. This reflects historical scheduled service and may be out of date.

What is the time difference between Washington and Seattle?

Time difference ~ 3 hours (varies with daylight-saving).

When is it warmest in United States?

Across United States, the warmest month on average is July, with mean temperatures around 30°C. These are country-level monthly climate normals, not airport-specific.

Distances and flight times are great-circle estimates, not booked block times.