There are several airlines that operate frequent flights from Seattle (SEA) to Chicago (ORD) including

• Alaska Airlines with 201 flights a week
• Delta Air Lines with 185 flights a week
• United Airlines with 61 flights a week
• American Airlines with 57 flights a week
• with 3 flights a week

The earliest flight leaves Seattle Tacoma Intl. Airport at 00:35 and arrives at O'Hare Intl. Airport at 04:50. The last flight of the day departs Seattle at 23:59 and arrives at Chicago at 23:59.

The flight distance from Seattle to Chicago is about 2776 km, the shortest flight is 03 hours 38 minutes with United Airlines.

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