The Washington–Seattle route
Washington to Seattle is a coast-to-coast domestic pairing: about 2,300 miles between IAD and SEA. Nonstop IAD–SEA is often on the schedule, about 5 hours airborne over 2,300 miles. Red-eyes and Saturday-night stays change the total more than the map distance.
For IAD–SEA we show about $119 on the low end and around $240 as a more typical one-way economy total, USD, last reviewed August 2026. A $119 one-way is a sale-shaped guide, not a fare you can screenshot and demand. Taxes, bags, and seats change what you pay on the seller site.
Search IAD to SEA on Azurovia, compare airline-direct and travel-site totals on the same flights, then finish with the seller. We do not ticket. Keep their confirmation for changes.
Distance and time IAD–SEA
Great-circle distance IAD–SEA is about 2,300 miles. Block time on a nonstop is typically near 5 hours; wind, routing, and which runway you use still move the clock. Connections on the same city pair add layover time on top of that flying.
Seattle is about 3 hours behind Washington on standard time (America/New_York vs America/Los_Angeles). Arrival clocks on SEA are local. That matters more on this pair than on a same-zone hop.
When IAD–SEA has a nonstop, that is usually the cleanest product. One-stop options still appear — they are worth opening only if the USD total is materially lower after you count the extra ground time.
Airports for Washington to Seattle
Both ends are in the United States: Washington Dulles International (IAD) to Seattle-Tacoma International (SEA). This is not an international itinerary, so the usual domestic bag and ID rules apply at the seller. Alternate metro airports can still beat this pair on price.
Near Washington, also compare DCA (Washington), BWI (Baltimore). SEA is the arrival code we treat as primary for Seattle. A cheaper nearby airport only wins if the transfer still fits your plan. Search with “include nearby airports” when you want those codes in one results list.
Airport pages: IAD Washington Dulles International · SEA Seattle-Tacoma International · DCA · BWI
City hubs: Flights from Washington · Flights to Seattle
Bags on IAD–SEA
US domestic Washington–Seattle inventory often includes basic economy. Cabin and checked bags may be extra — the result cards say so when we have that fact. A cheaper headline fare can lose once you add a carry-on.
Airlines often shown
United is among the names that commonly appear on IAD–SEA, alongside JetBlue, Southwest, Spirit. That is who often operates or sells this city pair in our catalog, not a daily guarantee. Live search is the inventory that exists for your dates.
When people fly
On Washington–Seattle, demand is often softer in Jan and Feb, with Sep and Oct also worth checking. US holidays still reprice this pair. Move a day on the results strip before you assume the first date you typed is the cheapest.
Save this route
We’ll email you if live fares on this city pair drop. Search with dates for a specific trip.
Questions about this city pair
How long is the flight from Washington to Seattle?
Nonstop IAD–SEA is typically about 5 hours over roughly 2,300 miles. Connections take longer; compare total trip time on the results page.
When are Washington to Seattle fares often lower?
Demand is usually softer in Jan and Feb on this route, but live prices move daily. Search a few nearby dates rather than assuming a season is always cheapest.
Which airlines fly Washington to Seattle?
Sellers commonly show United, JetBlue, Southwest, Spirit on this city pair. The set on any given day depends on schedule and which travel sites return a fare.
What do Washington–Seattle tickets usually cost?
Guide one-way economy totals cluster around $240, with sales near $119, in USD. Those are not a quote — live search is the price that matters.
Should I fly a nearby airport instead of IAD–SEA?
From Washington, DCA, BWI sometimes undercut IAD. Add transfer time. Include nearby airports on search when you want those codes in one list.
Do I book Washington–Seattle with Azurovia?
No. Azurovia is a US metasearch. You compare airline and travel-site totals here, then complete the ticket with the seller you choose.
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