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$79+ Cheap flights from St. Louis to Portland (STL - PDX)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PDX
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in April or September, booked 56 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from St. Louis to Portland

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Portland (PDX). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 17, 2025.

Round-trip from

$232
(Kiwi.com)

One-way from

$79
(Priceline)

Popular in

March

Cheapest in

April

Average price

$316
From Lambert-St Louis to Portland
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One-way flight from Lambert-St Louis to Portland
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from St. Louis to Portland

Cheapest flights from St. Louis to Portland
Explore the most affordable flight options available from St. Louis to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/247:52 pmSTL - PDX
1 stop17h 56mFrontier
Mon 10/2710:34 amPDX - STL
2 stops20h 33mFrontier
Deal found 9/17$232
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/187:52 pmSTL - PDX
1 stop17h 56mFrontier
Tue 10/2112:43 pmPDX - STL
1 stop18h 24mFrontier
Deal found 9/16$235
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/314:52 pmSTL - PDX
2 stops21h 04mFrontier
Mon 11/310:03 amPDX - STL
2 stops21h 04mFrontier
Deal found 9/16$236
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/267:55 pmSTL - PDX
1 stop6h 17mFrontier
Mon 9/2911:09 amPDX - STL
2 stops19h 57mFrontier
Deal found 9/15$238
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:52 pmSTL - PDX
2 stops41h 06mFrontier
Fri 10/313:26 pmPDX - STL
1 stop15h 41mFrontier
Deal found 9/17$239
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/279:59 pmSTL - PDX
2 stops15h 57mFrontier
Sun 11/23:26 pmPDX - STL
2 stops16h 14mFrontier
Deal found 9/16$240
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/307:55 pmSTL - PDX
2 stops17h 16mMultiple Airlines
Sat 10/47:15 amPDX - STL
1 stop23h 51mMultiple Airlines
Deal found 9/15$242
This Alaska Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/76:33 amSTL - PDX
1 stop7h 52mAlaska Airlines
Tue 10/74:25 pmPDX - STL
1 stop5h 38mAlaska Airlines
Deal found 9/17$243
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/147:52 pmSTL - PDX
2 stops38h 31mFrontier
Tue 10/2112:43 pmPDX - STL
1 stop18h 24mFrontier
Deal found 9/16$245
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/287:55 pmSTL - PDX
2 stops16h 29mFrontier
Sat 10/47:15 amPDX - STL
1 stop23h 51mFrontier
Deal found 9/16$247
This Hawaiian Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/297:00 amSTL - PDX
1 stop7h 38mHawaiian Airlines
Sun 11/25:00 amPDX - STL
1 stop7h 18mHawaiian Airlines
Deal found 9/15$248

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Portland that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from St. Louis to Portland that are best for you.

Fly from

St. Louis

Fly to

Portland

Route

Depart

Return

Price

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 10/7

6:33 am-12:25 pm

1 stop7h 52m

Portland

Tue 10/7

4:25 pm-12:03 am

1 stop5h 38m

$243

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 11/24

6:40 pm-12:20 am

1 stop7h 40m

Portland

Thu 11/27

6:30 am-4:15 pm

1 stop7h 45m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 1/14

6:00 am-12:18 pm

1 stop8h 18m

Portland

Thu 1/22

12:59 pm-10:00 pm

1 stop7h 01m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 10/22

7:30 pm-11:43 pm

1 stop6h 13m

Portland

Sat 10/25

12:40 am-8:51 am

1 stop6h 11m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 1/14

7:30 am-12:42 pm

1 stop7h 12m

Portland

Wed 1/21

12:55 am-11:35 am

1 stop8h 40m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 10/23

2:05 pm-11:55 pm

1 stop11h 50m

Portland

Sun 10/26

9:05 pm-10:15 am

1 stop11h 10m

$260

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 10/31

1:09 pm-9:02 pm

2 stops9h 53m

Portland

Fri 11/7

3:26 pm-9:07 am

1 stop15h 41m

$265

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 12/4

2:36 pm-10:09 pm

1 stop9h 33m

Portland

Sat 12/6

12:32 am-9:10 am

1 stop6h 38m

$274

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 3/2

6:59 pm-11:54 pm

1 stop6h 55m

Portland

Tue 3/3

5:05 pm-12:37 am

1 stop5h 32m

$274

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 10/29

6:50 am-2:38 pm

2 stops9h 48m

Portland

Sun 11/2

5:40 am-1:39 pm

1 stop5h 59m

$291

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

Showing 1-10 of 22 results
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2
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Best time to book a flight from St. Louis to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Portland

How far ahead should I book a flight from St. Louis to Portland?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Portland. Price data was last updated on September 12, 2025.

Booking 56 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Portland. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to Portland?

Currently, November is the cheapest month in which you can book a flight from St. Louis to Portland (average of $277). Flying from St. Louis to Portland in March is currently the most expensive (average of $368). 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.

What is the cheapest time of day to fly from STL to PDX?

Find hourly flight availability from St. Louis to Portland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

When flying from St. Louis to Portland, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 30% versus a flight at noon.

What is the cheapest day to fly from St. Louis to Portland?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Portland. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to Portland flight should consider departing on Wednesday evenings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Portland

Get insights into the airlines that provide service to Portland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portland. Reviews last updated September 17, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from St. Louis to Portland to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Delta
8.0
Very good
7,961 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
United Airlines
7.4
Good
8,926 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Portland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this St. Louis to Portland flight route?

    Within the past month, 1 users have taken a look at flights from Lambert-St Louis to Portland.

  • How long is the flight from St. Louis to Portland?

    Airlines like Alaska Airlines, Southwest, and United Airlines fly from St. Louis to Portland in about 7h 40m. The time it takes to get you to your destination can typically vary by up to 38m. St. Louis and Portland are separated by a distance of 1702 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from St. Louis to Portland round-trip?

    Currently priced at $108, Frontier will fly you from St. Louis to Portland and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and American Airlines - these airlines can fly you to your destination from $210 and $212, respectively. These flights start at 69% lower than the current average price 3 months from now.

  • Where are the most common layover locations when flying from St. Louis to Portland?

    St. Louis to Portland flights have a layover in Denver most of the time.

  • What are some popular things to do or see while on a layover in Denver?

    Denver travelers tend to visit Coors Field, 16th Street Mall, and Paramount Theatre more than anywhere else. Coors Field, 16th Street Mall, and Paramount Theatre can be accessed by traveling approximately 18.4 mi, 18.7 mi, and 18.6 mi, respectively from Denver Intl. Those looking to explore during their layover in Denver can rent a car from Denver Intl for about $56 per day.

  • Where are the least popular layover locations for St. Louis to Portland flights?

    Flights departing from St. Louis and landing in Portland layover in Salt Lake City least frequently.

  • Can I find deals for flights from St. Louis to Portland that include hotel bookings?

    Yes. In addition to deals on St. Louis to Portland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Portland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Portland.

  • Can I find deals for business class flights from St. Louis to Portland?

    Yes. Cheapflights offers flight deals from St. Louis to Portland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Portland?

    Currently, November is the cheapest month in which you can book a flight from St. Louis to Portland (average of $277). Flying from St. Louis to Portland in March is currently the most expensive (average of $368). 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.

See more FAQs

Traveling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Vancouver
Seaside
Beaverton
Clackamas
McMinnville
Lake Oswego
Hillsboro
Cannon Beach
Long Beach
Longview
Lincoln City
Tigard
Depoe Bay
Stevenson
Wilsonville
Pacific City
Tillamook
Troutdale
Gresham
Silverton

Browse thousands of different options on Cheapflights for your next trip

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Top 7 airlines flying from St. Louis to Portland

Discover the top 7 airlines that operate flights from St. Louis to Portland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$219FlexibilityNo cancel feeOn-time62%
DeltaCheapest$210Average$329FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$212Average$352FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$226Average$399FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$238Average$393FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$246Average$346FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$338Average$520FlexibilityNo cancel feeOn-time85%

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