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Flights from Portland to St. Louis

Find the cheapest flight options from Portland to St. Louis over the next three months. Book one-way tickets from KRW 215,225 and round-trip tickets from KRW 425,861.

      • PWM 06:00
        7h 25m
        1 stop
        STL 12:25
        Portland - St. Louis | Thu, Jan 8 | Delta Air Lines
        STL 06:35
        4h 28m
        1 stop
        PWM 12:03
        St. Louis - Portland | Tue, Jan 13 | Delta Air Lines
        KRW 425,861 KRW 760,782
        44% OFF
        44% OFF
        KRW 760,782 KRW 425,861
      • PWM 17:07
        5h 44m
        1 stop
        STL 21:51
        Portland - St. Louis | Thu, Jan 8 | American Airlines
        STL 06:00
        5h 6m
        1 stop
        PWM 12:06
        St. Louis - Portland | Tue, Jan 13 | American Airlines
        KRW 454,224 KRW 760,782
        40% OFF
        40% OFF
        KRW 760,782 KRW 454,224
      • PWM 12:46
        5h 37m
        1 stop
        STL 17:23
        Portland - St. Louis | Thu, Jan 15 | American Airlines
        STL 06:00
        5h 6m
        1 stop
        PWM 12:06
        St. Louis - Portland | Sun, Jan 18 | American Airlines
        KRW 476,121 KRW 760,782
        37% OFF
        37% OFF
        KRW 760,782 KRW 476,121
      • PWM 06:00
        7h 33m
        1 stop
        STL 12:33
        Portland - St. Louis | Wed, Jan 7 | Delta Air Lines
        STL 15:45
        5h 42m
        1 stop
        PWM 22:27
        St. Louis - Portland | Mon, Jan 12 | Delta Air Lines
        KRW 483,421
        36% OFF
        KRW 760,782 KRW 483,421
      • PWM 06:00
        5h 41m
        1 stop
        STL 10:41
        Portland - St. Louis | Thu, Jan 15 | United Airlines
        STL 08:30
        5h 1m
        1 stop
        PWM 14:31
        St. Louis - Portland | Sun, Jan 18 | United Airlines
        KRW 489,260
        36% OFF
        KRW 760,782 KRW 489,260
      • PWM 06:00
        5h 41m
        1 stop
        STL 10:41
        Portland - St. Louis | Thu, Jan 8 | United Airlines
        STL 06:00
        5h 6m
        1 stop
        PWM 12:06
        St. Louis - Portland | Tue, Jan 13 | American Airlines
        KRW 500,105
        34% OFF
        KRW 760,782 KRW 500,105
      • PWM 06:00
        7h 25m
        1 stop
        STL 12:25
        Portland - St. Louis | Thu, Feb 5 | Delta Air Lines
        STL 06:35
        4h 28m
        1 stop
        PWM 12:03
        St. Louis - Portland | Mon, Feb 9 | Delta Air Lines
        KRW 505,319
        34% OFF
        KRW 760,782 KRW 505,319
      • PWM 12:46
        5h 37m
        1 stop
        STL 17:23
        Portland - St. Louis | Mon, Jan 26 | American Airlines
        STL 15:54
        5h 13m
        1 stop
        PWM 22:07
        St. Louis - Portland | Wed, Jan 28 | American Airlines
        KRW 508,447
        33% OFF
        KRW 760,782 KRW 508,447
      • PWM 05:30
        6h 34m
        1 stop
        STL 11:04
        Portland - St. Louis | Sun, Jan 25 | Delta Air Lines
        STL 06:35
        4h 28m
        1 stop
        PWM 12:03
        St. Louis - Portland | Tue, Jan 27 | Delta Air Lines
        KRW 537,852
        28% OFF
        KRW 760,782 KRW 537,852
      • PWM 06:00
        5h 41m
        1 stop
        STL 10:41
        Portland - St. Louis | Wed, Jan 7 | United Airlines
        STL 06:00
        5h 6m
        1 stop
        PWM 12:06
        St. Louis - Portland | Mon, Jan 12 | American Airlines
        KRW 555,371
        27% OFF
        KRW 760,782 KRW 555,371
      • PWM 13:00
        17h 25m
        1 stop
        STL Invalid Date
        Portland - St. Louis | Sun, Dec 14 | Normal Airline
        STL 15:00
        6h
        Direct
        PWM 16:00
        St. Louis - Portland | Tue, Dec 16 | Normal Airline
        Find More Flights
        Find More Flights
      • PWM 06:08
        7h 49m
        1 stop
        STL 12:57
        Portland - St. Louis | Tue, Dec 16 | Delta Air Lines
        KRW 215,225 KRW 405,960
        47% OFF
        47% OFF
        KRW 405,960 KRW 215,225
      • PWM 06:00
        6h 55m
        1 stop
        STL 11:55
        Portland - St. Louis | Wed, Jan 7 | Delta Air Lines
        KRW 236,080 KRW 405,960
        42% OFF
        42% OFF
        KRW 405,960 KRW 236,080
      • PWM 06:03
        5h 42m
        1 stop
        STL 10:45
        Portland - St. Louis | Wed, Dec 17 | Delta Air Lines
        KRW 242,545 KRW 405,960
        40% OFF
        40% OFF
        KRW 405,960 KRW 242,545
      • PWM 06:03
        7h 59m
        1 stop
        STL 13:02
        Portland - St. Louis | Fri, Dec 12 | Delta Air Lines
        KRW 274,244
        32% OFF
        KRW 405,960 KRW 274,244
      • PWM 06:00
        5h 50m
        1 stop
        STL 10:50
        Portland - St. Louis | Tue, Dec 16 | United Airlines
        KRW 274,244
        32% OFF
        KRW 405,960 KRW 274,244
      • PWM 16:10
        7h 33m
        1 stop
        STL 22:43
        Portland - St. Louis | Thu, Dec 25 | United Airlines
        KRW 278,624
        31% OFF
        KRW 405,960 KRW 278,624
      • PWM 05:30
        6h 34m
        1 stop
        STL 11:04
        Portland - St. Louis | Sun, Jan 25 | Delta Air Lines
        KRW 295,100
        27% OFF
        KRW 405,960 KRW 295,100
      • PWM 19:27
        5h 32m
        1 stop
        STL 23:59
        Portland - St. Louis | Wed, Jan 7 | United Airlines
        KRW 295,725
        27% OFF
        KRW 405,960 KRW 295,725
      • PWM 06:00
        5h 50m
        1 stop
        STL 10:50
        Portland - St. Louis | Wed, Dec 17 | United Airlines
        KRW 296,142
        27% OFF
        KRW 405,960 KRW 296,142
      • PWM 06:00
        7h 25m
        1 stop
        STL 12:25
        Portland - St. Louis | Fri, Jan 9 | Delta Air Lines
        KRW 296,351
        27% OFF
        KRW 405,960 KRW 296,351
      • PWM 13:00
        17h 25m
        1 stop
        STL Invalid Date
        Portland - St. Louis | Sun, Dec 14 | Normal Airline
        Find More Flights
        Find More Flights

Displayed flight fares from Portland to St. Louis are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight details for Portland to St. Louis

The distance between Portland and St. Louis is 1,750.83 km. Based on Trip.com's data, travel demand peaks in November. The off-season for travel is September.

Cheapest one-way flight priceKRW 215,225
Cheapest round-trip ticket priceKRW 425,861
Off-season for travelSeptember
Peak season for travelNovember
Flight distance1,750.83 km

Find the best time to fly from Portland to St. Louis

The cheapest time for Portland to St. Louis flights: Dec 14 to Dec 21 — one way flight prices from KRW 215,224.

Cheapest flights
From price
Search
  • 714
  • 1421
  • 2128

  • Jan

    284
  • 411
  • 1118
  • 1825

  • Feb

    251
  • 18
  • 815
  • 1522

  • Mar

    221
Displayed fare trends are based on Trip.com's aggregated average of the lowest flight prices from Portland to St. Louis, calculated over the upcoming 10 weeks.

Flight FAQs

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

    Based on Trip.com data, Delta Air Lines offers one-way fares as low as KRW 215,225 on Cheapest nonstop routes (e.g. PWM to STL on Tue, Dec 16), while Delta Air Lines offers Cheapest nonstop round-trips from KRW 425,861 departing on Thu, Jan 8 and returning on Tue, Jan 13.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Portland 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.
  • To find best deals on flights from Portland 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 Tue, Dec 16, with one-way flights priced at just KRW 215,225.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Delta Air Lines.
    · 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 November.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Portland to St. Louis is September, when demand for travel is lower.
  • After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Portland to St. Louis on December 13, 2025 with American Airlines, with prices starting at KRW 625,234.
  • The time difference between St. Louis and Portland is 1h.
  • 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.