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Flights from Seattle to St. Louis

Hi, I've summed up all the key info for Seattle to St. Louis flights

Cheapest one-way

$ 81
Delta Air Lines Wed, Oct 28

60% below next 30d avg. ($202)

Cheapest round-trip

$ 159
American Airlines Thu, Sep 24

67% below next 30d avg. ($480)

Fastest flight

3h 59mAvg: 3h 57m

Recommended airlines

When to travel

NovemberCheapest month
JulyPeak month

With a lowest one-way fare of $81 , travelers can expect an average price of $202 for upcoming trips, while round-trip tickets start at $159 . Flights typically take around 3h 57m , but the fastest nonstop option completes the journey in just 3h 59m minutes. There are 34 flights weekly on this route. You can arrive at any of the following airports in St. Louis: St. Louis Lambert International Airport (STL) , and St. Louis Downtown Airport (CPS) . Flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport (SEA-STL) are by far the most popular option for this route. To secure the best rates, booking 40 days in advance is recommended, and the cheapest travel days are Tuesday, Wednesday, and Saturday .

Updated 3h 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 Seattle to St. Louis over the next 90 days, with one-way fares from $81 and round-trip from $159. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        SEA 12:35 PM
        4h 3m
        Nonstop
        STL 6:38 PM
        Seattle - St. Louis | Wed, Sep 23 | Alaska Airlines
        STL 10:55 AM
        4h 20m
        Nonstop
        SEA 1:15 PM
        St. Louis - Seattle | Sun, Sep 27 |
        $246 $425
        42% off
        42% off
        $425 $246
      • SEA 6:03 PM
        3h 56m
        Nonstop
        STL 11:59 PM
        Seattle - St. Louis | Sun, Sep 20 | Alaska Airlines
        STL 10:55 AM
        4h 20m
        Nonstop
        SEA 1:15 PM
        St. Louis - Seattle | Sun, Sep 27 |
        $306 $425
        28% off
        28% off
        $425 $306
      • SEA 3:41 PM
        6h 46m
        1 stop
        STL 12:27 AM
        Seattle - St. Louis | Thu, Sep 24 | American Airlines
        STL 5:43 AM
        7h 28m
        1 stop
        SEA 11:11 AM
        St. Louis - Seattle | Tue, Sep 29 | American Airlines
        $159 $425
        63% off
        63% off
        $425 $159
      • SEA 5:10 AM
        6h 54m
        1 stop
        STL 2:04 PM
        Seattle - St. Louis | Tue, Nov 10 | American Airlines
        STL 5:00 AM
        8h 12m
        1 stop
        SEA 11:12 AM
        St. Louis - Seattle | Thu, Nov 12 | American Airlines
        $159
        63% off
        $425 $159
      • SEA 5:30 AM
        7h 14m
        1 stop
        STL 2:44 PM
        Seattle - St. Louis | Tue, Sep 29 | American Airlines
        STL 5:00 AM
        7h 9m
        1 stop
        SEA 10:09 AM
        St. Louis - Seattle | Thu, Oct 1 | American Airlines
        $159
        63% off
        $425 $159
      • SEA 5:00 AM
        7h 30m
        1 stop
        STL 2:30 PM
        Seattle - St. Louis | Sat, Oct 17 | American Airlines
        STL 7:10 PM
        7h
        1 stop
        SEA 12:10 AM
        St. Louis - Seattle | Sat, Oct 24 | American Airlines
        $159
        63% off
        $425 $159
      • SEA 3:41 PM
        6h 46m
        1 stop
        STL 12:27 AM
        Seattle - St. Louis | Mon, Sep 28 | American Airlines
        STL 5:00 AM
        7h 9m
        1 stop
        SEA 10:09 AM
        St. Louis - Seattle | Thu, Oct 1 | American Airlines
        $159
        63% off
        $425 $159
      • SEA 6:00 AM
        7h 14m
        1 stop
        STL 3:14 PM
        Seattle - St. Louis | Sat, Sep 26 | Delta Air Lines
        STL 5:47 PM
        8h 8m
        1 stop
        SEA 11:55 PM
        St. Louis - Seattle | Fri, Oct 2 | Delta Air Lines
        $161
        62% off
        $425 $161
      • SEA 11:59 PM
        8h 32m
        1 stop
        STL 10:31 AM
        Seattle - St. Louis | Mon, Sep 21 | Delta Air Lines
        STL 6:40 AM
        10h 9m
        1 stop
        SEA 2:49 PM
        St. Louis - Seattle | Thu, Sep 24 | Delta Air Lines
        $162
        62% off
        $425 $162
      • SEA 11:15 PM
        8h 10m
        1 stop
        STL 9:25 AM
        Seattle - St. Louis | Tue, Nov 10 | Delta Air Lines
        STL 5:22 PM
        8h 35m
        1 stop
        SEA 11:57 PM
        St. Louis - Seattle | Thu, Nov 12 | Delta Air Lines
        $162
        62% off
        $425 $162
      • SEA 11:50 PM
        8h 48m
        1 stop
        STL 10:38 AM
        Seattle - St. Louis | Fri, Oct 9 | Delta Air Lines
        STL 5:35 PM
        8h 24m
        1 stop
        SEA 11:59 PM
        St. Louis - Seattle | Tue, Oct 13 | Delta Air Lines
        $163
        62% off
        $425 $163
      • SEA 1:00 PM
        17h 25m
        1 stop
        STL 2:00 PM
        Seattle - St. Louis | Sat, Sep 19 | Normal Airline
        STL 3:00 PM
        6h
        Nonstop
        SEA 4:00 PM
        St. Louis - Seattle | Mon, Sep 21 | Normal Airline
        Find more flights
        Find more flights
      • Cheapest nonstop
        SEA 6:00 PM
        3h 59m
        Nonstop
        STL 11:59 PM
        Seattle - St. Louis | Tue, Oct 13 | Alaska Airlines
        $126 $230
        45% off
        45% off
        $230 $126
      • SEA 12:35 PM
        4h 3m
        Nonstop
        STL 6:38 PM
        Seattle - St. Louis | Wed, Sep 23 | Alaska Airlines
        $165 $230
        28% off
        28% off
        $230 $165
      • SEA 6:00 AM
        9h 19m
        1 stop
        STL 5:19 PM
        Seattle - St. Louis | Wed, Oct 28 | Delta Air Lines
        $81 $230
        65% off
        65% off
        $230 $81
      • SEA 6:12 AM
        8h 41m
        1 stop
        STL 4:53 PM
        Seattle - St. Louis | Wed, Oct 28 | American Airlines
        $83
        64% off
        $230 $83
      • SEA 6:00 AM
        8h 47m
        1 stop
        STL 4:47 PM
        Seattle - St. Louis | Sat, Oct 3 | Delta Air Lines
        $84
        63% off
        $230 $84
      • SEA 11:57 PM
        8h 21m
        1 stop
        STL 10:18 AM
        Seattle - St. Louis | Sat, Oct 3 | American Airlines
        $84
        63% off
        $230 $84
      • SEA 11:59 PM
        8h 32m
        1 stop
        STL 10:31 AM
        Seattle - St. Louis | Wed, Sep 23 | Delta Air Lines
        $85
        63% off
        $230 $85
      • SEA 6:00 AM
        7h 14m
        1 stop
        STL 3:14 PM
        Seattle - St. Louis | Sat, Sep 19 | Delta Air Lines
        $90
        61% off
        $230 $90
      • SEA 4:27 PM
        24h 47m
        1 stop
        STL 7:14 PM
        Seattle - St. Louis | Fri, Oct 30 | Frontier Airlines
        $92
        60% off
        $230 $92
      • SEA 4:27 PM
        24h 30m
        1 stop
        STL 6:57 PM
        Seattle - St. Louis | Fri, Oct 23 | Frontier Airlines
        $92
        60% off
        $230 $92
      • SEA 1:00 PM
        17h 25m
        1 stop
        STL 2:00 PM
        Seattle - St. Louis | Sat, Sep 19 | Normal Airline
        Find more flights
        Find more flights

Flight.News
A Heat Advisory remains in effect for St. Louis until 8 PM CDT Friday. Heat index values are expected to reach up to 107. Hot temperatures and high humidity may cause heat illnesses.
Flights from Seattle to St. Louis operate an average of 10 times per day over the past 7 days, with a 23.8% on-time departure rate and a 93.3% on-time arrival rate.

Which airlines are the most popular for Seattle to St. Louis flights?

You can choose from 1 airlines that fly from Seattle to St. Louis, including Alaska Airlines, Delta Air Lines has lowest fares on this route.
Alaska Airlines logo Alaska Airlines
Airlines are determined based on actual purchased flight tickets from Seattle to St. Louis according to previous 12 months data from Trip.com.

Trip.com price insights on flights from Seattle to St. Louis

Which month has the cheapest one-way flights from Seattle to St. Louis?

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

Based on Trip.com’s data, the cheapest month for flights from Seattle to St. Louis is October, with an average price of $173; while the month with the highest flight price is usually December, with an average price of up to $383.

$383
$278
$173
$68
    Cheapest
  • $214
    Sep
  • $173
    Oct
  • $274
    Nov
  • $383
    Dec
  • $265
    Jan
  • $227
    Feb
  • $173
    Mar
  • $179
    Apr
  • $295
    May
  • $244
    Jun
  • $223
    Jul
  • $287
    Aug

When is the cheapest day to fly from Seattle to St. Louis during Columbus Day?

Data is based on the lowest one-way price from Seattle to St. Louis during Columbus Day on Trip.com in the past 3 days.

Columbus Day is scheduled for Oct 12. The cheapest flights from Seattle to St. Louis are available on Oct 12, with fares starting at $113.

$232
$173
$113
$54
    Cheapest
  • $145
    9
    Oct
  • $232
    10
  • $170
    11
  • $113
    12
  • $163
    13
  • $125
    14

Frequently Asked Questions

  • What are the cheapest flights from Seattle to St. Louis (SEA-STL)?

    Based on Trip.com data, Delta Air Lines offers one-way fares as low as $81 on Cheapest nonstop routes (e.g. SEA to STL on Wed, Oct 28), while American Airlines offers Cheapest nonstop round-trips from $159 departing on Thu, Sep 24 and returning on Tue, Sep 29.
  • At the moment, you can catch a nonstop flight from Seattle to St. Louis with the following airlines, including: Alaska Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.
  • It takes around 3 hours 57 minutes to fly from Seattle (SEA) to St. Louis (STL).
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to St. Louis 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.
  • Based on Trip.com data in the past 4 weeks, there is 34 flight per week flying from Seattle to St. Louis. You can check the weekly schedule for popular airlines on this route below: Alaska Airlines: S/M/T/W/T/F/S -- AS672 (14:33) Alaska Airlines: S/M/T/W/T/F/S -- AS388 (08:31)
  • To find best deals on flights from Seattle to St. Louis, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Wed, Oct 28, with one-way flights priced at just $81.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Alaska Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for St. Louis travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Seattle to St. Louis is November, when demand for travel is lower.
  • You can arrive at any of the following airports in St. Louis: St. Louis Lambert International Airport (STL), and St. Louis Downtown Airport (CPS). Flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport (SEA-STL) are by far the most popular option for this route.
  • The time difference between St. Louis and Seattle is 2h.
  • Tickets can only be changed or canceled 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 Seattle to St. Louis is $202. 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 Seattle to St. Louis is $480. The final price depends on the outbound and return dates, airline and fare conditions.
  • Enter Seattle and St. Louis, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.
  • Frontier Airlinesare the most popular budget airlines flying from Seattle to St. Louis. Check baggage, seat and payment fees before comparing the final price.

Explore More Popular Flights

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

Book with no extra fees

Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
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.
Cancellation/change due to a flight schedule change:
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.