Book Cheap United flight from Seattle (SEA) to Chicago (ORD) from CA $229

Find The Best Day to Book a Cheap United Flights From Seattle to Chicago

Cheapest United Flights from Seattle (SEA) to Chicago (ORD)

The cheapest flights to O'Hare Intl. found within the past 7 days were CA $477 round trip and CA $229 one way. Prices and availability subject to change. Additional terms may apply.

Wed, May 6 - Wed, May 13
SEA
Seattle
ORD
Chicago
CA $477 Roundtrip, found 5 days ago
CA $477
Roundtrip
found 5 days ago
Select United flight, departing Wed, May 6 from Seattle to Chicago, returning Wed, May 13, priced at CA $477 found 5 days ago

Frequently asked questions

Can I catch a flight from Sea-Tac Airport to ORD right now?
For information on any current O'Hare Airport quarantine requirements and travel advice, visit the Covid-19 Travel Advisor. Check before you arrange your flight, so you don't get caught up en route.
What terminal is United Airlines at Sea-Tac Airport?
While we can't say for certain exactly which terminal your United Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to O'Hare Intl. Airport (ORD) will set off from, we can tell you that it's likely you'll be getting off the plane at terminal 1.
Are there United Airlines non-stop flights from SEA to ORD?
It is possible to fly direct from Seattle - Tacoma Intl. Airport (SEA) to O'Hare Airport with United Airlines and avoid the hassles of stopovers. The less time you spend getting to your destination, the more time you'll have for new experiences.
How long is a United Airlines flight from SEA to ORD?
As it will take around 4 hours and 34 minutes for your United Airlines flight to get from Seattle - Tacoma Intl. Airport (SEA) to O'Hare Intl. Airport (ORD), consider packing a few travel games in your cabin bag. You never know — the person next to you might love the chance to play to break up the journey.
What type of aircraft does United Airlines fly from SEA to ORD?
When you zip through the clouds between SEA and ORD with United Airlines, you'll probably be doing it aboard the Boeing 737-900. The carrier also operates the Boeing 737 MAX 9 on this route.
How many direct and indirect flights does United Airlines fly from SEA to ORD?
If you'd like to book a trip from SEA to ORD, you can select from around 4 United Airlines flights daily.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to ORD, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Grab a great United flight from SEA to ORD 

To find a great deal on United flights with Travelocity, simply enter your origin and destination airports, pick your travel dates, and hit search. From here, you can sort by price, flight duration, and arrival/departure time. You can also filter to find nonstop flights. 

Flying United Seattle to Chicago gives you fights to choose from. With that direct flight time of , you’ll be touching down before you know it.  

 

Find cheap flights with United between Seattle and Chicago 

United has a range of great fares on stacks of flights, and to find the most affordable for you, there are a few tricks you can try. Booking in advance, for example, is a great way to grab a fantastic deal. Also, choose the cheapest month, if you can. One-way flights from Seattle to Chicago with United are May.  

The more flexible you are, the more affordable flights you’re likely to find. Consider one-way flights and connecting flights, as well as standard roundtrip and direct options. Even if you’re flying today, cheap last-minute flights are easy to find by entering your travel dates and hitting search.  

 

Reasons to book your United flights with Travelocity 

Travelocity makes it easy to book a seat, anywhere in the world. The vast inventory, fast search, and advanced filters put some of the best deals on the planet in one place. Whether you’re traveling on business, with friends, family, or on your own, take your pick from some fantastic options. And with free cancellation and pay later options, you can travel more and worry less.  

United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

Travelers ❤️ these 🏨 after their flight to Chicago

Hilton Chicago O'Hare Airport

Hilton Chicago O'Hare Airport

4 out of 5
O'Hare International Airport Chicago IL
Book a stay at this business-friendly hotel in Chicago. Enjoy 2 restaurants, breakfast (surcharge), and a free airport shuttle. Our guests praise the helpful ...
8.4/10 Very Good! (2,228 reviews)
The hotel had no electricity upon arrival, inexplicably as there were no severe weather conditions. I was handed two glow sticks to be able to guide my way around the hotel and my room. You can’t make this stuff up. The fact that there was nothing provided to compensate for the matter (discount, ...

Reviewed on Mar 19, 2026

Hilton Chicago O'Hare Airport
Hyatt Regency O'Hare Chicago

Hyatt Regency O'Hare Chicago

4 out of 5
9300 Bryn Mawr Ave Rosemont IL
Book a stay at this business-friendly hotel in Rosemont. Enjoy free WiFi, breakfast (surcharge), and a free airport shuttle. Our guests praise the helpful staff ...
8.8/10 Excellent! (2,416 reviews)
It was nice and clean

Reviewed on Mar 20, 2026

Hyatt Regency O'Hare Chicago
Holiday Inn Chicago O'Hare – Rosemont by IHG

Holiday Inn Chicago O'Hare – Rosemont by IHG

3 out of 5
6600 Mannheim Road, building 2 Rosemont IL
Book a stay at this business-friendly hotel in Rosemont. Enjoy free WiFi, breakfast (surcharge), and a free airport shuttle. Our guests praise the breakfast ...
9/10 Wonderful! (2,869 reviews)
Everyone was helpful - check-in, restaurant

Reviewed on Mar 18, 2026

Holiday Inn Chicago O'Hare – Rosemont by IHG
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.

Explore More Ways to Travel with Travelocity

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.