$85 Cheap United flights Seattle (SEA) to Chicago (ORD)

You’ll find affordable return United Airlines flights from $169 from SEA to ORD by filtering your results from “Price (lowest to highest)” on Expedia. Or search for deals from $85 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Search for return or one-way flights to Chicago in January or February. You could find cheaper fares with United Airlines during these off-season months.

Begin your search one to three months ahead of your travel date to find cheap fares on United Airlines flights from Seattle - Tacoma Intl. Airport (SEA) to O’Hare Intl. Airport (ORD). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Time it well, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Hop on one of United Airlines’s 21 weekly direct flights from Seattle - Tacoma Intl. Airport (SEA) to O’Hare Intl. Airport (ORD). To see what’s available, enter your origin, dates and destination and hit search. Then select the “Nonstop” and “Airline” filters.

From takeoff till touchdown, a nonstop United Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to O’Hare Intl. Airport (ORD) takes around 4h 4m.

United Airlines has the most flights from Seattle - Tacoma Intl. Airport (SEA) to O’Hare Intl. Airport (ORD) on Thursday. With up to 4 daily departures, you’ll get the most flexibility on this day.

The first United Airlines flight from SEA to ORD departs at 7:00AM UTC-8, landing at 1:06PM UTC-6. If you’d like to head off later in the day, the last United Airlines flight leaves SEA at 11:59PM UTC-8 and lands at ORD at 6:00AM UTC-6. Flying before midday is generally a good option as morning and mid-morning flights are 20% less likely to be canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

O’Hare Intl. Airport (ORD) is the main gateway for United Airlines flights from Seattle - Tacoma Intl. Airport (SEA) to Chicago. But this carrier also flies to Midway Intl. Airport (MDW). Make sure you tick Expedia’s “All Airports” option for your destination to see what’s available for your trip to Chicago.

Fly from SEA to ORD with United Airlines and look forward to a host of benefits starting with a rewarding loyalty program. When booking through Expedia as a United Mileage Plus and One Key™ member, you could also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

For the Seattle - Tacoma Intl. Airport (SEA) to O’Hare Intl. Airport (ORD) route, United Airlines typically flies Boeing 737-800 and Boeing 737 MAX 8 planes. Keep in mind that last-minute changes can occur for operational reasons, so your flight could be on a different aircraft.

Depending on the ticket type you purchased, a fee may apply if you modify or cancel your booking more than 24 hours after it’s been confirmed. To find plane tickets with more flexibility, select our “Changes included” and “No cancel fee” boxes while looking for flights. To learn more about changing or canceling your reservation, go to “Trips,” select your flight and tick “Manage Booking.”