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St. Louis

$67+ 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 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
Feb 11 — Feb 181
Wed 2/11
Wed 2/18
1 adult, Economy
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Find cheap flights from Portland to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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

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 January 12, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$171
(Frontier)

One-way from

$67
(Kiwi.com)

Popular in

March

Cheapest in

November

Average price

$332

Good round-trip deal

$242 or less

Good one-way deal

$114 or less
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. 8% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Portland to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Portland to Lambert-St Louis.
Search Deals

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 January 12, 2026.

This Frontier deal was found by Cheapflights users on 1/12. 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.
Thu 1/2911:28 am
PDX
-
STL
1 stop7h 38m
Frontier
Thu 2/510:01 pm
STL
-
PDX
1 stop13h 48m
Frontier
Deal found 1/12$171
This Kiwi.com deal was found by Cheapflights users on 1/12. 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 3/612:04 pm
PDX
-
STL
1 stop19h 45m
Frontier
Sun 3/89:22 pm
STL
-
PDX
1 stop13h 36m
Frontier
Deal found 1/12$184
This Kiwi.com deal was found by Cheapflights users on 1/11. 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 3/612:04 pm
PDX
-
STL
1 stop19h 45m
Frontier
Mon 3/98:12 pm
STL
-
PDX
2 stops38h 46m
Frontier
Deal found 1/11$194
This Mytrip deal was found by Cheapflights users on 1/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/2911:28 am
PDX
-
STL
1 stop7h 38m
Frontier
Sun 2/19:32 pm
STL
-
PDX
1 stop15h 46m
Frontier
Deal found 1/12$199
This United Airlines deal was found by Cheapflights users on 1/12. 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.
Wed 3/48:30 am
PDX
-
STL
1 stop6h 28m
United Airlines
Fri 3/66:05 pm
STL
-
PDX
1 stop6h 54m
United Airlines
Deal found 1/12$249
This United Airlines deal was found by Cheapflights users on 1/12. 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.
Thu 2/198:30 am
PDX
-
STL
2 stops10h 35m
United Airlines
Sun 2/226:00 pm
STL
-
PDX
1 stop7h 14m
United Airlines
Deal found 1/12$254
This Alaska Airlines deal was found by Cheapflights users on 1/12. 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.
Thu 5/2112:00 pm
PDX
-
STL
1 stop9h 57m
Alaska Airlines
Wed 5/276:20 pm
STL
-
PDX
Nonstop4h 17m
Alaska Airlines
Deal found 1/12$259
This Delta deal was found by Cheapflights users on 1/12. 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.
Sat 2/141:53 pm
PDX
-
STL
1 stop7h 30m
Delta
Sun 2/156:10 am
STL
-
PDX
1 stop8h 34m
Delta
Deal found 1/12$269
This American Airlines deal was found by Cheapflights users on 1/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1611:40 pm
PDX
-
STL
1 stop7h 17m
American Airlines
Sat 4/186:00 am
STL
-
PDX
1 stop9h 22m
American Airlines
Deal found 1/11$274
This United Airlines deal was found by Cheapflights users on 1/12. 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.
Sat 2/712:57 pm
PDX
-
STL
1 stop7h 03m
United Airlines
Tue 2/109:57 am
STL
-
PDX
2 stops10h 13m
United Airlines
Deal found 1/12$279

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 January 12, 2026.
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

Sun 2/8

12:59 pm-10:00 pm

1 stop7h 01m

Lambert-St Louis

Tue 2/17

7:41 am-3:27 pm

1 stop9h 46m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 4/16

11:15 pm-9:42 am

1 stop8h 27m

Lambert-St Louis

Sat 4/18

3:25 pm-8:07 pm

1 stop6h 42m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 2/13

11:35 pm-10:13 am

1 stop8h 38m

Lambert-St Louis

Sun 2/15

6:00 am-10:58 am

1 stop6h 58m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 5/13

11:18 am-5:06 pm

Nonstop3h 48m

Lambert-St Louis

Tue 5/19

6:20 pm-8:37 pm

Nonstop4h 17m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 2/19

8:30 am-4:58 pm

1 stop6h 28m

Lambert-St Louis

Sun 2/22

6:00 pm-11:14 pm

1 stop7h 14m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 5/21

11:18 am-5:06 pm

Nonstop3h 48m

Lambert-St Louis

Wed 5/27

6:20 pm-8:37 pm

Nonstop4h 17m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 4/2

12:30 am-9:01 am

1 stop6h 31m

Lambert-St Louis

Mon 4/6

12:28 pm-5:39 pm

1 stop7h 11m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 2/20

11:59 pm-10:36 am

1 stop8h 37m

Lambert-St Louis

Sun 2/22

6:00 pm-11:14 pm

1 stop7h 14m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sat 2/7

1:24 pm-8:58 pm

1 stop5h 34m

Lambert-St Louis

Tue 2/10

4:15 pm-9:12 pm

1 stop6h 57m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 4/1

12:30 am-9:01 am

1 stop6h 31m

Lambert-St Louis

Thu 4/9

6:12 pm-11:54 pm

1 stop7h 42m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/12

Showing 1-10 of 23 results
1
2
3

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star

*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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Portland-St. Louis flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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 January 9, 2026.

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, December is the cheapest month in which you can book a flight from Portland to St. Louis (average of $165). Flying from Portland to St. Louis in June is currently the most expensive (average of $248). 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.

How much does it cost to fly round-trip from Portland to St. Louis?

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 January 12, 2026.
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
11,696 reviews

Overall

8.0

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
8.0
Very good
11,696 reviews
Alaska Airlines
8.0
Very good
11,696 reviews

Overall

8.0

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Southwest
8.0
Very good
4,256 reviews
Alaska Airlines
8.0
Very good
11,696 reviews

Overall

8.0

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,039 reviews
Alaska Airlines
8.0
Very good
11,696 reviews

Overall

8.0

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
United Airlines
7.4
Good
9,149 reviews
Alaska Airlines
8.0
Very good
11,696 reviews

Overall

8.0

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
American Airlines
7.2
Good
11,114 reviews
Alaska Airlines
8.0
Very good
11,696 reviews

Overall

8.0

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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 $249, United Airlines can have you in St. Louis from Portland in 7h 01m. There are 1702 mi between Portland and St. Louis. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Currently priced at $139, 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 $193 and $226, respectively. Users have found that Frontier is 62% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Portland to St. Louis one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $86. American Airlines flights start at $113 while deals on United Airlines start at $113 one-way.

  • What are the cheapest flights from Portland to St. Louis?

    Looking at all options, your cheapest flight can be booked for $114. While the most popular route (Portland - Lambert-St Louis) can be booked for $249 on average, our data indicates $178 when flying from Portland to St. Louis.

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

    Portland to St. Louis 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?

    If you're on a layover in Denver and looking for things to do, consider visiting Coors Field, 16th Street Mall, or Paramount Theatre. Coors Field, 16th Street Mall, and Paramount Theatre are located about 18.4 mi, 18.7 mi, and 18.6 mi, respectively from Denver Intl. Travelers can rent a car at Denver Intl for an average daily rate of $49 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 Salt Lake City.

  • 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, December is the cheapest month in which you can book a flight from Portland to St. Louis (average of $165). Flying from Portland to St. Louis in June is currently the most expensive (average of $248). 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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
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 January 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$158Average$282FlexibilityNo cancel feeOn-time62%
DeltaCheapest$221Average$374FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$226Average$396FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$226Average$386FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$242Average$445FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$246Average$402FlexibilityNo cancel feeOn-time63%

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