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

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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
Nov 2 — Nov 91
Sun 11/2
Sun 11/9
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Portland to Lambert-St Louis are usually found in January or October, booked 76 days in advance, depart on a Monday or Tuesday and return on a Tuesday

Cheap flight deals from Portland to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to St. Louis (STL). 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 October 3, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$244
(United Airlines)

One-way from

$79
(Cheapflightsfares)

Popular in

March

Cheapest in

January

Average price

$325
Provider with most accurate pricing for Portland-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Lambert-St Louis flights.
Search Deals
From Portland to Lambert-St Louis
Search Deals
One-way flight from Portland to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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Find flight deals from Portland to St. Louis

Cheapest flights from Portland to St. Louis
Explore the most affordable flight options available from Portland to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 3, 2025.

This United Airlines deal was found by Cheapflights users on 9/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/286:00 amPDX - STL
1 stop8h 27mUnited Airlines
Fri 10/315:24 pmSTL - PDX
1 stop7h 09mUnited Airlines
Deal found 9/30$244
This Kiwi.com deal was found by Cheapflights users on 10/1. 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 10/2812:52 pmPDX - STL
1 stop18h 15mFrontier
Thu 10/306:22 pmSTL - PDX
2 stops17h 56mFrontier
Deal found 10/1$245
This Alaska Airlines deal was found by Cheapflights users on 10/3. 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.
Fri 10/241:25 pmPDX - STL
1 stop8h 38mAlaska Airlines
Mon 10/277:00 amSTL - PDX
1 stop8h 50mAlaska Airlines
Deal found 10/3$248
This Delta deal was found by Cheapflights users on 10/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2112:40 amPDX - STL
1 stop6h 11mDelta
Wed 10/296:00 amSTL - PDX
1 stop8h 50mDelta
Deal found 10/1$249
This Kiwi.com deal was found by Cheapflights users on 10/2. 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 10/213:28 pmPDX - STL
1 stop15h 39mFrontier
Sat 10/257:52 pmSTL - PDX
2 stops41h 06mFrontier
Deal found 10/2$252
This Kiwi.com deal was found by Cheapflights users on 10/2. 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 10/2412:43 pmPDX - STL
1 stop18h 24mFrontier
Sat 10/257:52 pmSTL - PDX
2 stops41h 06mFrontier
Deal found 10/2$253
This Kiwi.com deal was found by Cheapflights users on 10/2. 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 10/213:28 pmPDX - STL
1 stop15h 39mFrontier
Wed 10/227:52 pmSTL - PDX
2 stops19h 14mFrontier
Deal found 10/2$255
This Kiwi.com deal was found by Cheapflights users on 10/3. 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.
Wed 10/2212:43 pmPDX - STL
2 stops18h 39mFrontier
Mon 10/277:52 pmSTL - PDX
1 stop18h 04mFrontier
Deal found 10/3$256
This Kiwi.com deal was found by Cheapflights users on 10/1. 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.
Wed 10/153:28 pmPDX - STL
1 stop15h 39mFrontier
Mon 10/209:59 pmSTL - PDX
2 stops18h 32mFrontier
Deal found 10/1$257
This Delta deal was found by Cheapflights users on 10/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2112:40 amPDX - STL
1 stop6h 11mDelta
Sat 10/256:50 amSTL - PDX
2 stops14h 29mDelta
Deal found 10/1$261
This Kiwi.com deal was found by Cheapflights users on 10/1. 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.
Wed 10/2212:43 pmPDX - STL
1 stop18h 24mFrontier
Sun 10/261:41 pmSTL - PDX
2 stops48h 15mFrontier
Deal found 10/1$262

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to St. Louis 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 October 3, 2025.
Use the filters below to find and compare flights from Portland to St. Louis that are best for you.

Fly from

Portland

Fly to

St. Louis

Route

Depart

Return

Price

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 10/22

4:25 pm-12:03 am

1 stop5h 38m

Lambert-St Louis

Fri 10/31

7:00 am-12:38 pm

1 stop7h 38m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 3/3

1:45 pm-11:56 pm

1 stop8h 11m

Lambert-St Louis

Wed 3/4

7:00 am-12:36 pm

1 stop7h 36m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 10/24

1:25 pm-12:03 am

1 stop8h 38m

Lambert-St Louis

Tue 10/28

7:00 am-12:38 pm

1 stop7h 38m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sat 11/8

6:00 am-3:18 pm

1 stop7h 18m

Lambert-St Louis

Sat 11/15

7:00 am-1:50 pm

1 stop8h 50m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 10/24

1:25 pm-12:03 am

1 stop8h 38m

Lambert-St Louis

Sat 10/25

6:33 am-12:25 pm

1 stop7h 52m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 10/24

1:25 pm-12:03 am

1 stop8h 38m

Lambert-St Louis

Mon 10/27

7:00 am-12:38 pm

1 stop7h 38m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 10/22

4:25 pm-12:03 am

1 stop5h 38m

Lambert-St Louis

Mon 10/27

7:00 am-12:38 pm

1 stop7h 38m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 10/30

1:35 pm-11:59 pm

1 stop8h 24m

Lambert-St Louis

Sun 11/2

7:00 am-12:35 pm

1 stop7h 35m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 10/21

12:40 am-8:51 am

1 stop6h 11m

Lambert-St Louis

Wed 10/29

6:00 am-12:50 pm

1 stop8h 50m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 10/21

12:40 am-8:51 am

1 stop6h 11m

Lambert-St Louis

Mon 10/27

6:00 am-12:50 pm

1 stop8h 50m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/1

Showing 1-10 of 22 results
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Compare providers for flights from Portland to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to St. Louis in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Portland to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Portland 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 Portland to St. Louis

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

Use this chart to determine the optimal time to book a round-trip flight from Portland to St. Louis. Price data was last updated on September 26, 2025.

The best time to book flights from Portland to St. Louis is 76 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from Portland to St. Louis (average of $311). Flying from Portland to St. Louis in March is currently the most expensive (average of $356). 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 PDX to STL?

Find hourly flight availability from Portland to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 3, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 58% on flights from Portland to St. Louis by exploring options for tickets in the evening.

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

Use this chart to determine the cheapest time to fly round-trip from Portland to St. Louis. Price data was last updated on August 10, 2025.

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

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated October 3, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from Portland to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,001 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

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
11,001 reviews
Alaska Airlines
8.0
Very good
11,001 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

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
4,248 reviews
Alaska Airlines
8.0
Very good
11,001 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

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
7,966 reviews
Alaska Airlines
8.0
Very good
11,001 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

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
8,940 reviews
Alaska Airlines
8.0
Very good
11,001 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

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
11,041 reviews
Alaska Airlines
8.0
Very good
11,001 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

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

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

    For as low as $248, Alaska Airlines can have you in St. Louis from Portland in 5h 38m. There are 1702 mi between Portland and St. Louis.

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

    Currently priced at $118, Frontier will fly you from Portland to St. Louis 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 $204 and $226, respectively. Users have found that Frontier is 68% cheaper than the other options available to this destination.

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

    Portland to St. Louis flights have a layover in Salt Lake City most of the time.

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

    If you're on a layover in Salt Lake City and looking for things to do, consider visiting Temple Square, Salt Lake Temple, or Hogle Zoo. Temple Square, Salt Lake Temple, and Hogle Zoo are located about 4.7 mi, 4.8 mi, and 9.1 mi, respectively from Salt Lake City. Travelers can rent a car at Salt Lake City for an average daily rate of $50 to make sightseeing during their layover a little easier.

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

    Of the flights from Portland to St. Louis that have layovers, the fewest flights stop in Denver.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portland to St. Louis 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 Portland to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Portland to St. Louis (average of $311). Flying from Portland to St. Louis in March is currently the most expensive (average of $356). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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Top 6 airlines flying from Portland to St. Louis

Discover the top 6 airlines that operate flights from Portland to St. Louis. 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 October 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$118Average$230FlexibilityNo cancel feeOn-time62%
DeltaCheapest$204Average$375FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$226Average$397FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$226Average$420FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$247Average$422FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$262Average$452FlexibilityNo cancel feeOn-time75%

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