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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 10/13. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to Lambert-St Louis are usually found in January or September, 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 September 17, 2025.

Round-trip from

$248
(Hawaiian Airlines)

One-way from

$79
(Priceline)

Popular in

March

Cheapest in

January

Average price

$318

Good one-way deal

$292 or less
From Portland to Lambert-St Louis
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One-way flight from Portland to Lambert-St Louis
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Highest demand for flights based on searches. 5% potential increase in price ($21 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 17, 2025.

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.
Fri 10/241:25 pmPDX - STL
1 stop8h 38mHawaiian Airlines
Tue 10/287:00 amSTL - PDX
1 stop7h 38mHawaiian Airlines
Deal found 9/15$248
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/305:10 pmPDX - STL
1 stop5h 14mDelta
Sun 11/25:00 amSTL - PDX
1 stop8h 50mDelta
Deal found 9/15$249
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.
Mon 11/1710:03 amPDX - STL
2 stops21h 04mFrontier
Wed 12/37:43 pmSTL - PDX
1 stop18h 14mFrontier
Deal found 9/16$251
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.
Fri 10/2410:34 amPDX - STL
2 stops20h 33mFrontier
Mon 10/277:52 pmSTL - PDX
1 stop18h 04mFrontier
Deal found 9/16$252
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.
Wed 10/1512:43 pmPDX - STL
1 stop18h 24mFrontier
Wed 10/227:52 pmSTL - PDX
2 stops39h 47mFrontier
Deal found 9/15$254
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.
Mon 9/2912:07 pmPDX - STL
2 stops18h 59mMultiple Airlines
Tue 10/77:52 pmSTL - PDX
1 stop17h 56mMultiple Airlines
Deal found 9/15$256
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 9/2611:23 amPDX - STL
1 stop7h 17mFrontier
Sun 9/282:38 pmSTL - PDX
1 stop29h 49mFrontier
Deal found 9/16$258
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2812:35 pmPDX - STL
2 stops9h 35mSouthwest
Fri 10/311:45 pmSTL - PDX
2 stops9h 45mSouthwest
Deal found 9/15$259
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/145:30 amPDX - STL
2 stops11h 50mSouthwest
Sun 11/165:45 pmSTL - PDX
1 stop8h 35mSouthwest
Deal found 9/15$260
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 9/267:03 pmPDX - STL
2 stops36h 03mFrontier
Mon 9/294:00 pmSTL - PDX
2 stops32h 34mFrontier
Deal found 9/16$261
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/296:05 amPDX - STL
1 stop25h 01mMultiple Airlines
Wed 10/86:33 amSTL - PDX
1 stop7h 52mMultiple Airlines
Deal found 9/15$265

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 September 17, 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

Sat 11/8

6:00 am-3:18 pm

1 stop7h 18m

Lambert-St Louis

Sat 11/15

7:00 am-12:38 pm

1 stop7h 38m

$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

Fri 10/24

10:58 pm-9:37 am

1 stop8h 39m

Lambert-St Louis

Sun 10/26

2:15 pm-9:48 pm

1 stop9h 33m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 12/8

11:19 pm-10:50 am

1 stop9h 31m

Lambert-St Louis

Fri 12/12

5:30 pm-12:44 am

1 stop9h 14m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 10/6

12:40 am-8:51 am

1 stop6h 11m

Lambert-St Louis

Tue 10/7

3:30 pm-8:26 pm

1 stop6h 56m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 11/24

12:35 am-8:55 am

1 stop6h 20m

Lambert-St Louis

Tue 12/2

7:56 pm-12:05 am

1 stop6h 09m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 11/5

5:00 am-5:20 pm

2 stops10h 20m

Lambert-St Louis

Thu 11/6

5:45 pm-12:20 am

1 stop8h 35m

$254

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 10/22

12:40 am-8:51 am

1 stop6h 11m

Lambert-St Louis

Mon 10/27

3:30 pm-8:26 pm

1 stop6h 56m

$274

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 10/24

7:59 pm-8:51 am

2 stops10h 52m

Lambert-St Louis

Mon 10/27

3:30 pm-8:26 pm

1 stop6h 56m

$278

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 11/17

2:23 pm-12:46 am

2 stops8h 23m

Lambert-St Louis

Wed 12/3

2:36 pm-12:16 am

2 stops11h 40m

$287

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 20 results
1
2

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 12, 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 September 17, 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. Thursday mornings 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 September 17, 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
10,000 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
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
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
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
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
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
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
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
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
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
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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 7h 18m. 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 $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.

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

    To fly one-way, consider booking your trip with Hawaiian Airlines, which is currently one of the cheapest options available, starting at $124. Alaska Airlines flights start at $124 while deals on United Airlines start at $125 one-way.

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

    Looking at all options, your cheapest flight can be booked for $268. While the most popular route (Portland - Lambert-St Louis) can be booked for $184 on average, our data indicates $376 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, 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 $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 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

Browse thousands of different options on Cheapflights for your next trip

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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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$118Average$254FlexibilityNo cancel feeOn-time62%
DeltaCheapest$204Average$375FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$226Average$396FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$226Average$425FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$247Average$426FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$262Average$454FlexibilityNo cancel feeOn-time75%

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