RM519 Cheap Flights from Seattle (SEA) to Chicago (ORD)

Within the past 7 days on Expedia, for flights departing within the next year, the lowest price listed for a round-trip flight from Seattle - Tacoma Intl. Airport (SEA) to ORD was . Fares this good don’t last forever, so book yours today. Prices and availability are subject to change. Additional terms apply.

The majority of flights can be cancelled online, but each airline has a different set of terms and conditions. If you do need to cancel your flight, visit our Customer Service Portal and follow the instructions.

Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you’re searching for Seattle - Tacoma Intl. Airport (SEA) to O’Hare Intl. Airport (ORD) flights, you’ll see a “no change fees” filter for you to select.

The flight distance between Sea-Tac Airport and O’Hare Airport is 2,800 kilometres. Pack yourself a drink, a few snacks and something to read. Keep yourself entertained and the hours will fly by.

You have lots of choice when travelling from Seattle - Tacoma Intl. Airport (SEA) to O’Hare Intl. Airport (ORD). Lock in your ticket with one of these top airlines:

• Alaska Airlines - (AS) with 134 monthly flights
• United Airlines - (UA) with 117 monthly flights
• Delta Air Lines - (DL) with 69 monthly flights
• American Airlines - (AA) with 60 monthly flights

Last-minute planners can occasionally nab a bargain, with some of the cheapest fares from Sea-Tac Airport to O’Hare Intl. Airport (ORD) showing up a few weeks prior to the departure date. If you’d rather book ahead, Expedia compares and updates the best flight deals continuously — as early as 12 months in advance in some cases. It does depend on the carrier though, as not every airline advertises prices that far in advance.