Southwest® flights from St. Louis to Portland, ME from $187

Promo Code

Low fares from St. Louis to Portland, ME

$

St. Louis (STL)to

Portland, ME (PWM)
Depart: 02/09/2027

One-way

Basic

From
$187
Seen: 5 hrs ago

St. Louis (STL)to

Portland, ME (PWM)
Depart: 12/09/2026

One-way

Basic

From
$187
Seen: 3 hrs ago

St. Louis (STL)to

Portland, ME (PWM)
Depart: 12/10/2026

One-way

Basic

From
$207
Seen: 3 hrs ago

St. Louis (STL)to

Portland, ME (PWM)
Depart: 12/07/2026

One-way

Basic

From
$222
Seen: 28 minutes ago

St. Louis (STL)to

Portland, ME (PWM)
Depart: 02/09/2027

One-way

Choice

From
$232
Seen: 5 hrs ago

St. Louis (STL)to

Portland, ME (PWM)
Depart: 12/09/2026

One-way

Choice

From
$232
Seen: 3 hrs ago

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Explore flights from St. Louis to Portland, ME

Nov 2026
From$289*
Seen: 17 hrs ago
One Way/Basic
Dec 2026
From$187*
Seen: 3 hrs ago
One Way/Basic
Jan 2027
No result for this month.
cmp-daily-histogram-bars-legend-min-price-aria-label $187
cmp-daily-histogram-bars-legend-max-price-aria-label $544
Displaying fares for November-2026
  • STL–PWM, 11/12/2026: From $544
    12

    Thu

    NOV

  • STL–PWM, 11/13/2026: From $544
    13

    Fri

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    14

    Sat

  • STL–PWM, 11/15/2026: From $544
    15

    Sun

  • STL–PWM, 11/16/2026: From $544
    16

    Mon

  • STL–PWM, 11/17/2026: From $469
    17

    Tue

  • STL–PWM, 11/18/2026: From $469
    18

    Wed

  • STL–PWM, 11/19/2026: From $469
    19

    Thu

  • STL–PWM, 11/20/2026: From $469
    20

    Fri

  • STL–PWM, 11/21/2026: From $469
    21

    Sat

  • STL–PWM, 11/22/2026: From $469
    22

    Sun

  • STL–PWM, 11/23/2026: From $469
    23

    Mon

  • STL–PWM, 11/24/2026: From $469
    24

    Tue

  • STL–PWM, 11/25/2026: From $289
    25

    Wed

  • STL–PWM, 11/26/2026: From $289
    26

    Thu

  • STL–PWM, 11/27/2026: From $337
    27

    Fri

  • STL–PWM, 11/28/2026: From $365
    28

    Sat

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    29

    Sun

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    30

    Mon

  • STL–PWM, 12/01/2026: From $284
    01

    Tue

    DEC

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    02

    Wed

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    03

    Thu

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    04

    Fri

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    05

    Sat

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    06

    Sun

  • STL–PWM, 12/07/2026: From $222
    07

    Mon

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    08

    Tue

  • STL–PWM, 12/09/2026: From $187
    09

    Wed

  • STL–PWM, 12/10/2026: From $207
    10

    Thu

  • STL–PWM: cmp-view-offers-disclaimer. Find Offers
    11

    Fri

    • Range$187-$544

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    Lambert-St Louis Int'l Airport
    Arriving at:
    Portland International Jetport
    Distance:
    1096 miles

    Questions we hear the most

    There are 83 weekly flights from St. Louis to Portland, ME on Southwest Airlines.
    To find the lowest fares by day and time to fly St. Louis to Portland, ME with Southwest, check out our Low Fare Calendar.
    You can rent a car at Portland International Jetport book yours with your flight.
    Yes! Flights from St. Louis to Portland, ME—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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