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$96+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
May 11 — May 181
Sun 5/11
Sun 5/18
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 September, booked 89 days in advance, depart on a Thursday or Monday 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 May 6, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$227
(Delta)

One-way from

$96
(Mytrip)

Popular in

December

Cheapest in

January

Average price

$344

Good round-trip deal

$564 or less

Good one-way deal

$270 or less
Provider with most accurate pricing for Portland-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Portland-Lambert-St Louis flights.
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From Portland to Lambert-St Louis
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One-way flight from Portland to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($29 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
Search Deals
Price to beat on a round-trip flight from Portland to Lambert-St Louis.
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Price to beat on a one-way flight from Portland to Lambert-St Louis.
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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 May 6, 2025.

This Delta deal was found by Cheapflights users on 5/4. 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 6/312:40 amPDX - STL
1 stop8h 07mDelta
Mon 6/911:17 amSTL - PDX
1 stop6h 37mDelta
Deal found 5/4$227
This American Airlines deal was found by Cheapflights users on 5/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/211:54 pmPDX - STL
1 stop6h 02mAmerican Airlines
Sat 8/97:23 amSTL - PDX
1 stop9h 06mAmerican Airlines
Deal found 5/3$228
This CheapOair deal was found by Cheapflights users on 5/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/16:35 amPDX - STL
1 stop24h 37mFrontier
Sat 6/78:11 pmSTL - PDX
1 stop16h 04mFrontier
Deal found 5/5$229
This Southwest deal was found by Cheapflights users on 5/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/76:20 amPDX - STL
1 stop10h 00mSouthwest
Sun 6/88:25 pmSTL - PDX
1 stop6h 20mSouthwest
Deal found 5/5$232
This Hawaiian Airlines deal was found by Cheapflights users on 5/4. 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.
Mon 9/11:24 pmPDX - STL
1 stop8h 35mHawaiian Airlines
Tue 9/93:35 pmSTL - PDX
1 stop9h 09mHawaiian Airlines
Deal found 5/4$247
This United Airlines deal was found by Cheapflights users on 5/4. 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.
Mon 6/234:15 pmPDX - STL
1 stop5h 44mUnited Airlines
Sun 6/295:00 amSTL - PDX
1 stop6h 42mUnited Airlines
Deal found 5/4$269
This Expedia deal was found by Cheapflights users on 5/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/281:25 pmPDX - STL
1 stop8h 39mMultiple Airlines
Sat 5/317:55 pmSTL - PDX
1 stop6h 22mMultiple Airlines
Deal found 5/5$278
This Mytrip deal was found by Cheapflights users on 5/5. 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.
Wed 5/285:40 pmPDX - STL
2 stops13h 35mSpirit Airlines
Sat 5/3110:10 amSTL - PDX
2 stops28h 32mSpirit Airlines
Deal found 5/5$354
This Alaska Airlines deal was found by Cheapflights users on 5/4. 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 5/292:30 pmPDX - STL
1 stop7h 34mAlaska Airlines
Thu 6/55:30 amSTL - PDX
1 stop8h 22mAlaska Airlines
Deal found 5/4$366

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 May 6, 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

Tue 6/3

12:40 am-10:47 am

1 stop8h 07m

Lambert-St Louis

Wed 6/11

5:44 pm-11:32 pm

1 stop7h 48m

$227

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sat 8/2

11:54 pm-7:56 am

1 stop6h 02m

Lambert-St Louis

Sat 8/9

7:23 am-2:29 pm

1 stop9h 06m

$228

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sun 6/1

6:35 am-9:12 am

1 stop24h 37m

Lambert-St Louis

Sat 6/7

8:11 pm-10:15 am

1 stop16h 04m

$229

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sat 6/7

6:20 am-6:20 pm

1 stop10h 00m

Lambert-St Louis

Sun 6/8

8:25 pm-12:45 am

1 stop6h 20m

$232

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 9/1

1:24 pm-11:59 pm

1 stop8h 35m

Lambert-St Louis

Tue 9/9

3:35 pm-10:44 pm

1 stop9h 09m

$247

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 6/2

12:54 pm-10:15 pm

1 stop7h 21m

Lambert-St Louis

Mon 6/9

5:20 am-9:39 am

1 stop6h 19m

$267

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 5/28

1:25 pm-12:04 am

1 stop8h 39m

Lambert-St Louis

Sat 5/31

7:55 pm-12:17 am

1 stop6h 22m

$278

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 5/28

5:40 pm-9:15 am

2 stops13h 35m

Lambert-St Louis

Sat 5/31

10:10 am-12:42 pm

2 stops28h 32m

$354

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 5/29

2:30 pm-12:04 am

1 stop7h 34m

Lambert-St Louis

Thu 6/5

5:30 am-11:52 am

1 stop8h 22m

$366

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 5/13

6:20 am-9:59 am

1 stop25h 39m

$96

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/3

Showing 1-10 of 19 results
1
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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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust 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 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 May 2, 2025.

The best time to book flights from Portland to St. Louis is 89 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 May 6, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 31% on flights from Portland to St. Louis by exploring options for tickets in the afternoon.

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 March 30, 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. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 May 6, 2025.
Read through reviews of airlines operating flights from Portland to St. Louis, such as Alaska Airlines, Southwest and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,987 reviews

Comfort

7.9

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,987 reviews
Alaska Airlines
8.0
Very good
9,987 reviews

Comfort

7.9

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,292 reviews
Alaska Airlines
8.0
Very good
9,987 reviews

Comfort

7.9

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,939 reviews
Alaska Airlines
8.0
Very good
9,987 reviews

Comfort

7.9

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,422 reviews
Alaska Airlines
8.0
Very good
9,987 reviews

Comfort

7.9

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,702 reviews
Alaska Airlines
8.0
Very good
9,987 reviews

Comfort

7.9

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    Currently priced at $227, Delta will fly you from Portland to St. Louis and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and Frontier - these airlines can fly you to your destination from $228 and $229, respectively. Users have found that Delta is 40% 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 $96. Alaska Airlines flights start at $113 while deals on Southwest start at $114 one-way.

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

    Looking at all options, your cheapest flight can be booked for $243. While the most popular route (Portland - Lambert-St Louis) can be booked for $227 on average our data indicates $538 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 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, Abravanel Hall, or Salt Lake Temple. Temple Square, Abravanel Hall, and Salt Lake Temple are located about 4.7 mi, 4.7 mi, and 4.8 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 Portland?

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

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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 May 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$118Average$209FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$196Average$377FlexibilityNo cancel feeOn-time71%
DeltaCheapest$213Average$364FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$226Average$443FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$228Average$432FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$252Average$463FlexibilityNo cancel feeOn-time63%

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