Cheap Flights from CHI to SEA

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The Cheapest Round-trip Tickets from Chicago to Seattle

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12 July 202614 July 2026DirectAlaska AirlinesRT from 178

The Cheapest Flights for this Month from Chicago to Seattle

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21 April 202628 April 20262 StopsAlaska AirlinesRT from 323
27 April 202630 April 2026DirectUnited AirlinesRT from 313
1 May 20268 May 20261 StopFrontier AirlinesRT from 276
21 May 202625 May 20261 StopFrontier AirlinesRT from 311
28 May 20261 June 20262 StopsFrontier AirlinesRT from 263
17 June 202621 June 20261 StopSouthwest AirlinesRT from 214
24 June 202628 June 20261 StopFrontier AirlinesRT from 299
12 July 202614 July 2026DirectAlaska AirlinesRT from 178
6 August 20269 August 20261 StopFrontier AirlinesRT from 289
1 October 20268 October 2026DirectAlaska AirlinesRT from 203

The Cheapest Flights from Chicago to Seattle for the Year Ahead

Departure atReturn atStopsAirlineFind tickets
27 April 202630 April 2026DirectUnited AirlinesRT from 313
28 May 20261 June 20262 StopsFrontier AirlinesRT from 263
17 June 202621 June 20261 StopSouthwest AirlinesRT from 214
12 July 202614 July 2026DirectAlaska AirlinesRT from 178
6 August 20269 August 20261 StopFrontier AirlinesRT from 289
1 October 20268 October 2026DirectAlaska AirlinesRT from 203
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