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$69+ 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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
Jul 7 — Jul 141
Mon 7/7
Mon 7/14
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 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 July 2, 2025.

Round-trip from

$255
(Gotogate)

One-way from

$69
(Priceline)

Popular in

December

Cheapest in

January

Average price

$368

Good round-trip deal

$505 or less

Good one-way deal

$243 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 ($10 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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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 July 2, 2025.

This Gotogate deal was found by Cheapflights users on 6/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/256:35 amPDX - STL
1 stop24h 36mFrontier
Mon 7/287:29 pmSTL - PDX
1 stop6h 47mFrontier
Deal found 6/30$255
This Expedia deal was found by Cheapflights users on 7/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/41:25 pmPDX - STL
1 stop8h 34mMultiple Airlines
Sun 10/127:52 pmSTL - PDX
1 stop6h 24mMultiple Airlines
Deal found 7/1$276
This Southwest deal was found by Cheapflights users on 7/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/106:00 amPDX - STL
1 stop6h 25mSouthwest
Thu 9/113:55 pmSTL - PDX
1 stop6h 15mSouthwest
Deal found 7/2$292
This Alaska Airlines deal was found by Cheapflights users on 6/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:30 pmPDX - STL
1 stop15h 11mAlaska Airlines
Tue 10/73:57 pmSTL - PDX
1 stop8h 46mAlaska Airlines
Deal found 6/30$296
This Delta deal was found by Cheapflights users on 6/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1312:46 amPDX - STL
1 stop5h 48mDelta
Thu 8/215:30 pmSTL - PDX
1 stop8h 01mDelta
Deal found 6/30$297
This Mytrip deal was found by Cheapflights users on 6/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/303:10 pmPDX - STL
2 stops16h 42mSpirit Airlines
Wed 8/611:24 amSTL - PDX
2 stops23h 54mSpirit Airlines
Deal found 6/30$329
This American Airlines deal was found by Cheapflights users on 6/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/2112:59 amPDX - STL
1 stop6h 19mAmerican Airlines
Wed 7/305:30 amSTL - PDX
1 stop7h 04mAmerican Airlines
Deal found 6/30$335

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 July 2, 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

Fri 7/25

6:35 am-9:11 am

1 stop24h 36m

Lambert-St Louis

Mon 7/28

7:29 pm-12:16 am

1 stop6h 47m

$255

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 8/5

7:01 pm-9:11 am

1 stop12h 10m

Lambert-St Louis

Tue 8/12

6:41 am-10:47 am

1 stop6h 06m

$272

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 9/10

6:00 am-2:25 pm

1 stop6h 25m

Lambert-St Louis

Thu 9/11

3:55 pm-8:10 pm

1 stop6h 15m

$292

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 10/1

9:30 pm-2:41 pm

1 stop15h 11m

Lambert-St Louis

Tue 10/7

3:57 pm-10:43 pm

1 stop8h 46m

$296

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 8/13

12:46 am-8:34 am

1 stop5h 48m

Lambert-St Louis

Thu 8/21

5:30 pm-11:31 pm

1 stop8h 01m

$297

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 7/30

3:10 pm-9:52 am

2 stops16h 42m

Lambert-St Louis

Wed 8/6

11:24 am-9:18 am

2 stops23h 54m

$329

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 7/21

12:59 am-9:18 am

1 stop6h 19m

Lambert-St Louis

Wed 7/30

5:30 am-10:34 am

1 stop7h 04m

$335

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 9/8

11:13 am-8:44 pm

1 stop7h 31m

$69

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 7/23

10:23 am-9:52 am

3 stops21h 29m

$129

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sat 11/8

6:00 am-3:05 pm

1 stop7h 05m

$135

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 13 results
1
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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 June 27, 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 July 2, 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 June 29, 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 July 2, 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

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

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
4,272 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

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
7,983 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,540 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

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 $255, 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 Southwest and Alaska Airlines - these airlines can fly you to your destination from $292 and $296, respectively. Users have found that Frontier is 34% 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 $69. Spirit Airlines flights start at $129 while deals on Hawaiian Airlines start at $135 one-way.

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

    Looking at all options, your cheapest flight can be booked for $189. While the most popular route (Portland - Lambert-St Louis) can be booked for $248 on average our data indicates $405 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 $57 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
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Festus
Chesterfield
Farmington

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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 July 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$118Average$225FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$212Average$393FlexibilityNo cancel feeOn-time71%
DeltaCheapest$212Average$372FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$226Average$429FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$244Average$439FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$252Average$458FlexibilityNo cancel feeOn-time63%

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