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Cheap Flights from Seattle to Williston (SEA-SDY)
Prices were available within the past 7 days and start at $167 for one-way flights and $334 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.
![Alaska Airlines](http://images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif)
Tue, Jul 30 - Sat, Aug 3
SEA
Seattle
SDY
Sidney
$334 Roundtrip, found 1 day ago
$334
Roundtrip
found 1 day ago
![United](http://images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif)
Sat, Mar 15 - Mon, Mar 24
SEA
Seattle
SDY
Sidney
$343 Roundtrip, found 13 hours ago
$343
Roundtrip
found 13 hours ago
![Alaska Airlines](http://images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif)
Tue, Jul 16 - Sat, Jul 27
SEA
Seattle
SDY
Sidney
$343 Roundtrip, found 6 days ago
$343
Roundtrip
found 6 days ago
![Delta](http://images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif)
Sat, Jul 6 - Tue, Jul 16
SEA
Seattle
SDY
Sidney
$353 Roundtrip, found 2 days ago
$353
Roundtrip
found 2 days ago
![Delta](http://images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif)
Sat, Jul 27 - Tue, Aug 6
SEA
Seattle
SDY
Sidney
$363 Roundtrip, found 1 day ago
$363
Roundtrip
found 1 day ago
![Alaska Airlines](http://images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif)
Wed, Jul 31 - Sat, Aug 3
SEA
Seattle
SDY
Sidney
$368 Roundtrip, found 1 day ago
$368
Roundtrip
found 1 day ago
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