Route guide

Windsor to Seattle (STS-SEA): Nonstop Upgrade & Award Space

Alaska Airlines, Inc. flies the STS to SEA nonstop about 12 times a week. That's enough service to give you a real choice of departures, though premium seats don't sit unclaimed for long. 2LNR watches every STS to SEA departure for confirmed upgrade and award space and can alert you when a date you're tracking opens up.

Data current as of July 21, 2026, refreshed on an ongoing basis as new schedules and seats are confirmed.

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12
Nonstop flights a week
618 mi
Nonstop distance
Free
To get started

Confirmed upgrade & award space on every STS to SEA departure

2LNR tracks confirmed upgrade and award availability on American, Delta, and Alaska and across 30 airlines, segment by segment, date by date. Open the calendar for Windsor to Seattle to see which departures have real space, or watch the route and get alerted when space opens.

See real availability

Confirmed upgrade and award seats on each STS to SEA departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See STS to SEA on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Windsor to Seattle nonstop

Carriers operating STS to SEA nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

  • Alaska Airlines, Inc.
See STS to SEA on the interactive map →

Frequently asked questions about STS to SEA

How far is Seattle from Windsor?
STS to SEA covers about 618 miles nonstop. Flight times vary by aircraft and season; each scheduled departure on this page lists its own times.
Which airlines fly nonstop from STS to SEA?
Alaska Airlines, Inc. is currently the only airline flying STS to SEA nonstop. 2LNR tracks confirmed upgrade and award space on every Alaska Airlines, Inc. departure.
How many flights a week are there from STS to SEA?
About 12 nonstop flights a week run between Windsor and Seattle in the current schedule, operated by Alaska Airlines, Inc.. Frequency shifts by season; the calendar on this page reflects what's currently scheduled.
How do I check upgrade or award availability on STS to SEA?
Open the STS to SEA calendar on this page to see confirmed upgrade and award space by date. You can also set an alert on the Windsor to Seattle route, and 2LNR will notify you when space opens. It's free to start.

Never miss STS to SEA upgrade or award space

Track confirmed availability, set alerts, and book with confidence. Free to start, no credit card required.

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