
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $270 (Frontier) |
One-way from | $138 (Trip.com) |
Popular in | June |
Cheapest in | January |
Average price | $339 |
Good round-trip deal | $355 or less |
Good one-way deal | $177 or less |
Fly from
Fly to
Route
Depart
Return
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Wed 7/8
9:50 pm-12:20 am
Nonstop4h 30m
Seattle/Tacoma Intl
Wed 7/15
5:00 am-10:55 am
Nonstop3h 55m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Fri 8/28
6:54 pm-9:43 pm
Nonstop4h 49m
Seattle/Tacoma Intl
Sun 8/30
6:00 am-12:07 pm
Nonstop4h 07m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Sat 5/30
7:12 am-9:47 am
Nonstop4h 35m
Seattle/Tacoma Intl
Tue 6/2
5:45 pm-11:55 pm
Nonstop4h 10m
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Thu 9/10
8:55 pm-11:30 pm
Nonstop4h 35m
Seattle/Tacoma Intl
Fri 9/18
10:50 am-4:55 pm
Nonstop4h 05m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Tue 8/11
7:00 am-9:37 am
Nonstop4h 37m
Seattle/Tacoma Intl
Thu 8/13
10:35 am-4:43 pm
Nonstop4h 08m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Thu 6/4
6:00 am-8:34 am
Nonstop4h 34m
Seattle/Tacoma Intl
Tue 6/9
4:42 pm-10:59 pm
Nonstop4h 17m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Fri 8/14
5:59 pm-8:38 pm
Nonstop4h 39m
Seattle/Tacoma Intl
Wed 8/19
7:15 am-1:23 pm
Nonstop4h 08m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Sat 8/22
5:59 pm-8:38 pm
Nonstop4h 39m
Seattle/Tacoma Intl
Sat 8/29
10:35 am-4:43 pm
Nonstop4h 08m
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Wed 6/3
9:40 pm-12:10 am
Nonstop4h 30m
Seattle/Tacoma Intl
Wed 6/10
2:00 pm-11:05 pm
1 stop7h 05m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Thu 5/28
10:30 am-4:20 pm
1 stop7h 50m
Seattle/Tacoma Intl
Fri 6/12
5:15 pm-11:22 pm
Nonstop4h 07m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
The best time to book flights from Chicago to Seattle is 40 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, January is the cheapest month in which you can book a flight from Chicago to Seattle (average of $88). Flying from Chicago to Seattle in February is currently the most expensive (average of $657). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
It’s typically best to fly out from Chicago to Seattle in the evening. Doing so could potentially save you 24% on the flight price compared to flying in the afternoon, which is usually more expensive.
Travelers seeking maximum savings on their Chicago to Seattle flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from CHI to SEA are scheduled on a Thursday (51 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (29 on average).
Las Vegas (LAS) – chosen by Cheapflights users on 67% of 1-stop itineraries from Chicago to Seattle on Cheapflights.
Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $240.
Flights via Las Vegas (LAS) have the shortest average one-way travel time for 1-stop routes: 11h 52m.
Flights via Las Vegas (LAS) offer the fastest connection on this route, with an average layover time of 7h 36m.
Entertainment
Comfort
Food
Boarding
Overall
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Comfort
Food
Boarding
Overall
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Comfort
Food
Boarding
Overall
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Comfort
Food
Boarding
Overall
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Comfort
Food
Boarding
Overall
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Comfort
Food
Boarding
Overall
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$84 | Average$249 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$113 | Average$284 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$131 | Average$258 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$168 | Average$302 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$176 | Average$397 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$177 | Average$339 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$194 | Average$356 | FlexibilityNo cancel fee | On-time63% |