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Cheap Flights from Chicago to Seattle

Hi, I've summed up all the key info for Chicago to Seattle flights

Cheapest one-way

S$ 117
Frontier Airlines Fri, Nov 6

52% below next 30d avg. (S$ 243)

Cheapest return

S$ 229
Alaska Airlines Tue, Oct 20

50% below next 30d avg. (S$ 457)

Best time to book

October Cheapest month
July Peak month

Fastest flight

4h 36m 7m faster than avg. (4h 43m)

Recommended airlines

With a lowest one-way fare of S$ 117 , travelers can expect an average price of S$ 243 for upcoming trips, while round-trip tickets start at S$ 229 . Flights typically take around 4h 43m , but the fastest nonstop option completes the journey in just 4h 36m minutes. Flights to Seattle can arrive at: Seattle-Tacoma International Airport (SEA) , King County (Boeing Field) International Airport (BFI) and Kenmore Air Harbor Seaplane Base (LKE). The most common route connects O'Hare International Airport and Seattle-Tacoma International Airport (ORD–SEA). To secure the best rates, booking 40 days in advance is recommended, and the cheapest travel days are Tuesday, Wednesday, and Saturday .

Updated 3d ago · This content is an AI-powered summary based on Trip.com data. Prices and availability are subject to change. Please refer to actual prices, availability, and travel conditions.

Explore the cheapest one-way and round-trip flights from Chicago to Seattle over the next 90 days, with one-way fares from S$ 117 and round-trip from S$ 229. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        ORD 07:00
        4h 42m
        Direct
        SEA 09:42
        Chicago - Seattle | Tue, Oct 20 | Alaska Airlines
        SEA 10:33
        4h 17m
        Direct
        ORD 16:50
        Seattle - Chicago | Tue, Oct 27 | Alaska Airlines
        S$ 229 S$ 420
        45% off
        45% off
        S$ 420 S$ 229
      • ORD 17:46
        4h 42m
        Direct
        SEA 20:28
        Chicago - Seattle | Fri, Oct 16 | Alaska Airlines
        SEA 10:33
        4h 17m
        Direct
        ORD 16:50
        Seattle - Chicago | Tue, Oct 20 | Alaska Airlines
        S$ 231 S$ 420
        45% off
        45% off
        S$ 420 S$ 231
      • ORD 15:49
        4h 39m
        Direct
        SEA 18:28
        Chicago - Seattle | Fri, Oct 23 | Alaska Airlines
        SEA 08:32
        4h 21m
        Direct
        ORD 14:53
        Seattle - Chicago | Fri, Oct 30 | Alaska Airlines
        S$ 237 S$ 420
        44% off
        44% off
        S$ 420 S$ 237
      • ORD 09:00
        4h 44m
        Direct
        SEA 11:44
        Chicago - Seattle | Thu, Oct 15 | Alaska Airlines
        SEA 11:56
        4h 24m
        Direct
        ORD 18:20
        Seattle - Chicago | Mon, Oct 19 | Alaska Airlines
        S$ 390
        7% off
        S$ 420 S$ 390
      • ORD 13:21
        22h 21m
        1 stop
        SEA 09:42
        Chicago - Seattle | Wed, Sep 23 | Frontier Airlines
        SEA 19:45
        7h 53m
        1 stop
        ORD 05:38
        Seattle - Chicago | Mon, Sep 28 | Frontier Airlines
        S$ 229
        45% off
        S$ 420 S$ 229
      • ORD 06:30
        10h 42m
        1 stop
        SEA 15:12
        Chicago - Seattle | Sat, Oct 31 | Frontier Airlines
        SEA 16:27
        5h 54m
        1 stop
        ORD 00:21
        Seattle - Chicago | Sat, Nov 7 | Frontier Airlines
        S$ 231
        45% off
        S$ 420 S$ 231
      • ORD 06:30
        10h 38m
        1 stop
        SEA 15:08
        Chicago - Seattle | Sat, Oct 3 | Frontier Airlines
        SEA 20:00
        8h 34m
        1 stop
        ORD 06:34
        Seattle - Chicago | Sat, Oct 10 | Frontier Airlines
        S$ 240
        43% off
        S$ 420 S$ 240
      • ORD 06:30
        10h 38m
        1 stop
        SEA 15:08
        Chicago - Seattle | Tue, Oct 6 | Frontier Airlines
        SEA 20:00
        8h 34m
        1 stop
        ORD 06:34
        Seattle - Chicago | Tue, Oct 13 | Frontier Airlines
        S$ 243
        42% off
        S$ 420 S$ 243
      • ORD 06:30
        10h 38m
        1 stop
        SEA 15:08
        Chicago - Seattle | Sat, Sep 19 | Frontier Airlines
        SEA 21:45
        29h 53m
        1 stop
        ORD 05:38
        Seattle - Chicago | Wed, Sep 23 | Frontier Airlines
        S$ 243
        42% off
        S$ 420 S$ 243
      • CHI 13:00
        17h 25m
        1 stop
        SEA 14:00
        Chicago - Seattle | Mon, Sep 14 | Normal Airline
        SEA 15:00
        6h
        Direct
        CHI 16:00
        Seattle - Chicago | Wed, Sep 16 | Normal Airline
        Find more flights
        Find more flights
      • Cheapest nonstop
        ORD 19:16
        4h 43m
        Direct
        SEA 21:59
        Chicago - Seattle | Wed, Oct 7 | Alaska Airlines
        S$ 120 S$ 156
        23% off
        23% off
        S$ 156 S$ 120
      • ORD 17:48
        4h 46m
        Direct
        SEA 20:34
        Chicago - Seattle | Mon, Nov 9 | Delta Air Lines
        S$ 121 S$ 156
        22% off
        22% off
        S$ 156 S$ 121
      • ORD 17:25
        4h 50m
        Direct
        SEA 20:15
        Chicago - Seattle | Wed, Oct 7 | American Airlines
        S$ 125 S$ 156
        20% off
        20% off
        S$ 156 S$ 125
      • ORD 17:44
        4h 36m
        Direct
        SEA 20:20
        Chicago - Seattle | Wed, Oct 7 | Delta Air Lines
        S$ 125
        20% off
        S$ 156 S$ 125
      • ORD 17:30
        4h 46m
        Direct
        SEA 20:16
        Chicago - Seattle | Sun, Nov 8 | Delta Air Lines
        S$ 130
        17% off
        S$ 156 S$ 130
      • ORD 06:35
        4h 45m
        Direct
        SEA 09:20
        Chicago - Seattle | Tue, Oct 20 | Delta Air Lines
        S$ 133
        15% off
        S$ 156 S$ 133
      • ORD 06:30
        10h 42m
        1 stop
        SEA 15:12
        Chicago - Seattle | Fri, Nov 6 | Frontier Airlines
        S$ 117
        25% off
        S$ 156 S$ 117
      • ORD 06:30
        10h 38m
        1 stop
        SEA 15:08
        Chicago - Seattle | Thu, Oct 8 | Frontier Airlines
        S$ 117
        25% off
        S$ 156 S$ 117
      • ORD 06:30
        10h 42m
        1 stop
        SEA 15:12
        Chicago - Seattle | Mon, Nov 2 | Frontier Airlines
        S$ 118
        24% off
        S$ 156 S$ 118
      • ORD 06:30
        10h 42m
        1 stop
        SEA 15:12
        Chicago - Seattle | Wed, Nov 4 | Frontier Airlines
        S$ 145
        7% off
        S$ 156 S$ 145
      • CHI 13:00
        17h 25m
        1 stop
        SEA 14:00
        Chicago - Seattle | Mon, Sep 14 | Normal Airline
        Find more flights
        Find more flights

Flight.News
Over the past 7 days, flights from Chicago to Seattle have operated an average of 53 times per day, with 9.6% on-time departure rate and 62.3% on-time arrival rate.

Which airlines are the most popular for Chicago to Seattle flights?

You can choose from 2 airlines that fly from Chicago to Seattle, including Alaska Airlines, Delta Air Lines, Frontier Airlines offers the lowest prices on this route.
Alaska Airlines logo Alaska Airlines
Delta Air Lines logo Delta Air Lines
Airlines are determined based on actual purchased flight tickets from Chicago to Seattle according to previous 12 months data from Trip.com.

Flying from Chicago to Seattle

The distance between Chicago and Seattle is approximately 2,785.86km. It takes around 4 hours 43 minutes on average to fly from Chicago to Seattle. Based on Trip.com's data, travel demand peaks in July. The off-season for travel is October.

Cheapest one-way flight price S$ 117
Cheapest return ticket price S$ 229
Off-season for travel October
Peak season for travel July
Flight distance 2,785.86km
Average flight time 4 hours 43 minutes
Popular airline Alaska Airlines
Frequency ～86/week
Flight statistics for the Chicago–Seattle route are based on aggregated booking data from Trip.com over the past 12 months.

Trip.com Price Insights on Flights from Chicago to Seattle.

What is the cheapest month for one-way flights from Chicago to Seattle?

The average price of one-way flights from Chicago to Seattle purchased by Trip.com users by month over the past 12 months.

Based on Trip.com’s data, the cheapest month for flights from Chicago to Seattle is October, with an average price of S$ 212, and the most expensive month is January, with an average price of up to S$ 299.

S$ 299
S$ 256
S$ 212
S$ 169
    Cheapest
  • S$ 255
    Sep
  • S$ 212
    Oct
  • S$ 243
    Nov
  • S$ 289
    Dec
  • S$ 299
    Jan
  • S$ 225
    Feb
  • S$ 243
    Mar
  • S$ 262
    Apr
  • S$ 276
    May
  • S$ 270
    Jun
  • S$ 283
    Jul
  • S$ 297
    Aug

Frequently Asked Questions

  • Which airlines offer the cheapest flights from Chicago to Seattle?

    Based on Trip.com data, Frontier Airlines offers Cheapest nonstop one-way flights from S$ 117 (for example, ORD–SEA on Fri, Nov 6). For a Cheapest nonstop return flight, Alaska Airlines offers fares from S$ 229, departing on Tue, Oct 20 and returning on Tue, Oct 27.
  • At the moment, you can catch a direct flight from Chicago to Seattle with the following airlines, including: Alaska Airlines United Airlines Delta Air Lines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.
  • It takes about 4 hours 43 minutes to fly from Chicago (CHI) to Seattle (SEA).
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Chicago to Seattle is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • On average, 83 direct flights operate each week between Chicago and Seattle. See below the schedules of the main airlines serving this route:
    Alaska Airlines: S/M/T/W/T/F/S – AS583 (departure at 08:09) Delta Air Lines: S/M/T/W/T/F/S – DL2041 (departure at 07:14) United Airlines: S/M/T/W/T/F/S – UA2099 (departure at 09:03)
  • Here are some tips for finding the best flight deals from Chicago to Seattle on Trip.com:
    · Be flexible with your travel dates. The cheapest flight is currently on Fri, Nov 6, with one-way fares from just S$ 117.
    · Compare airlines. Alaska Airlines currently offers the lowest fares on this route.
    · Set up a price alert to track fare changes without searching every day.
    · Check Trip.com regularly for flight deals and available promo codes.
    · Avoid peak season or book early. July is generally the busiest month for travel to Seattle.
    · Get exclusive promo codes on the Trip.com app.
  • The cheapest month to book a flight from Chicago to Seattle is usually October, when demand is lower.
  • After crunching the numbers on our September flight calendar, it's currently cheapest to fly from Chicago to Seattle on September 26, 2026 with Frontier Airlines, with prices starting at S$ 123.
  • Flights to Seattle can arrive at: Seattle-Tacoma International Airport (SEA), King County (Boeing Field) International Airport (BFI) and Kenmore Air Harbor Seaplane Base (LKE). The most common route connects O'Hare International Airport and Seattle-Tacoma International Airport (ORD–SEA).
  • The time difference between Seattle and Chicago is 2h.
  • Tickets can only be changed or cancelled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.
  • Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from Chicago to Seattle is S$ 243. Fares vary by travel date, airline and availability.
  • Based on Trip.com data for travel in the next 30 days, the average round-trip fare from Chicago to Seattle is S$ 457. The final price depends on the outbound and return dates, airline and fare conditions.
  • Enter Chicago and Seattle, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveller details and complete payment to receive your confirmation.

Find Cheap Flights & Deals on Trip.com

Note: Prices shown on this page are the lowest estimated prices found in the last 24 hours and include all taxes and fees.

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are shown before payment. Charges for checked baggage, meals, Wi-Fi, and other optional services may also appear in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page have been updated within the last 24 hours, and with many routes refreshed in real time. The more popular the route, the more accurate the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.