United Airlines had announced a while back that they were starting new nonstop service out of Paine Field/Snohomish County Airport in Northwest Washington area. Introductory fares are available to purchase now.
Travel Availability:
$89 OW Departs PAE to DEN: April 3, 9, 30; May 4, 7, 11, 14, 18, 25, 26; June 1, 4, 8
$94 OW Departs DEN to PAE: April 3, 24, 27; May 3, 4, 15, 18, 25, 26; June 1, 8, 15
$94 OW Departs PAE to SFO: May 4, 11, 18, 25, 29, 30; June 1, 8
$99 OW Departs SFO to PAE: April 30; May 4, 11, 18, 25, 26; June 1, 8
To book this, enter travel information on Expedia and select your flight. Bundling hotel with airfare will save money. Alaska Airlines has the same nonstop service between PAE and SFO so they have responded with a match or better fare. When you enter these dates on Expedia, your better price will result first.
http://www.expedia.com/