Frontier Airlines is selling cheap flights from Chicago to Seattle for as low as $84 return! That works out to a cost of just 2.5 Cents Per Mile for this 3400 mile journey.

The fare only includes a small carry-on bag placed under the seat, and you need to pay extra if you want to use the overhead storage or to check bags.

Our data shows the lowest prices are available in May 2021. See the link(s) below for dates and prices.

Sample date(s) with booking link

Feb 17 – Feb 22 ($99)

Mar 1 – Mar 4 ($88)

Mar 5 – Mar 12 ($94)

Mar 12 – Mar 18 ($88)

Mar 15 – Mar 18 ($88)

Apr 10 – Apr 14 ($94)

Apr 21 – Apr 28 ($94)

Apr 24 – Apr 27 ($97)

May 1 – May 4 ($97)

May 4 – May 11 ($84)

Are you looking for an apartment to rent for your stay in Seattle? Check out what has to offer!

We post many cheap flights like this one from Chicago to Seattle every single day, so have a look at our Travel Deals page, or check out the related posts below!

Note: Prices are valid at the time of publishing this post, but may change in the future.

COVID-19 Note: During these uncertain times, please make sure to check the relevant Coronavirus restrictions for your destination before you book and before you fly. We recommend also checking the refund policy of the airline, as well as purchasing travel insurance for your trip.