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$100+ Cheap flights from St. Louis to Portland (STL - PDX)

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 6/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PDX
Jun 23 — Jun 301
Mon 6/23
Mon 6/30
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in September or April, booked 89 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap flight deals from St. Louis to Portland

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Portland (PDX). 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 June 18, 2025.

Round-trip from

$292
(Southwest)

One-way from

$100
(Frontier)

Popular in

March

Cheapest in

September

Average price

$385

Good round-trip deal

$647 or less
From Lambert-St Louis to Portland
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One-way flight from Lambert-St Louis to Portland
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Highest demand for flights based on searches. 5% potential increase in price ($20 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 June 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Portland.
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Find flight deals from St. Louis to Portland

Cheapest flights from St. Louis to Portland
Explore the most affordable flight options available from St. Louis to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 18, 2025.

This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/53:55 pmSTL - PDX
1 stop6h 15mSouthwest
Tue 9/96:40 amPDX - STL
1 stop8h 15mSouthwest
Deal found 6/16$292
This Alaska Airlines deal was found by Cheapflights users on 6/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/266:00 amSTL - PDX
1 stop8h 24mAlaska Airlines
Tue 9/27:31 pmPDX - STL
1 stop17h 08mAlaska Airlines
Deal found 6/16$296
This American Airlines deal was found by Cheapflights users on 6/18. 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.
Fri 8/2210:08 amSTL - PDX
1 stop8h 40mAmerican Airlines
Sat 8/3010:23 amPDX - STL
1 stop6h 58mAmerican Airlines
Deal found 6/18$297
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/231:39 pmSTL - PDX
2 stops8h 58mUnited Airlines
Sat 9/2712:53 pmPDX - STL
1 stop5h 53mUnited Airlines
Deal found 6/16$302
This Delta deal was found by Cheapflights users on 6/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/77:15 pmSTL - PDX
1 stop6h 20mDelta
Sat 8/912:40 amPDX - STL
1 stop5h 54mDelta
Deal found 6/16$307
This Hawaiian Airlines deal was found by Cheapflights users on 6/16. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/296:30 pmSTL - PDX
1 stop6h 14mHawaiian Airlines
Mon 9/12:32 pmPDX - STL
1 stop7h 27mHawaiian Airlines
Deal found 6/16$317
This Orbitz deal was found by Cheapflights users on 6/15. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/47:29 pmSTL - PDX
1 stop6h 50mMultiple Airlines
Wed 7/93:40 pmPDX - STL
1 stop6h 19mMultiple Airlines
Deal found 6/15$323
This Mytrip deal was found by Cheapflights users on 6/18. 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 7/911:24 amSTL - PDX
2 stops23h 54mSpirit Airlines
Thu 7/243:10 pmPDX - STL
2 stops16h 42mSpirit Airlines
Deal found 6/18$336
This CheapOair deal was found by Cheapflights users on 6/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/257:29 pmSTL - PDX
1 stop5h 59mFrontier
Sun 6/296:35 amPDX - STL
1 stop24h 37mFrontier
Deal found 6/16$339

Cheapflights Fare Finder

Customize your flight search to find flights from St. Louis to Portland 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 June 18, 2025.
Use the filters below to find and compare flights from St. Louis to Portland that are best for you.

Fly from

St. Louis

Fly to

Portland

Route

Depart

Return

Price

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 9/5

3:55 pm-8:10 pm

1 stop6h 15m

Portland

Tue 9/9

6:40 am-4:55 pm

1 stop8h 15m

$292

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 8/26

6:00 am-12:24 pm

1 stop8h 24m

Portland

Tue 9/2

7:31 pm-2:39 pm

1 stop17h 08m

$296

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 8/22

8:50 am-2:29 pm

1 stop7h 39m

Portland

Sat 8/30

5:34 am-4:46 pm

1 stop9h 12m

$297

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 8/7

7:15 pm-11:35 pm

1 stop6h 20m

Portland

Sat 8/9

12:40 am-8:34 am

1 stop5h 54m

$307

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 8/29

6:30 pm-10:44 pm

1 stop6h 14m

Portland

Mon 9/1

2:32 pm-11:59 pm

1 stop7h 27m

$317

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 7/4

7:29 pm-12:19 am

1 stop6h 50m

Portland

Wed 7/9

3:40 pm-11:59 pm

1 stop6h 19m

$323

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 6/25

7:29 pm-11:28 pm

1 stop5h 59m

Portland

Sun 6/29

6:35 am-9:12 am

1 stop24h 37m

$339

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 7/19

10:45 am-9:18 am

2 stops24h 33m

Portland

Sat 7/26

3:10 pm-9:52 am

2 stops16h 42m

$366

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 7/11

6:33 am-11:43 am

1 stop7h 10m

Portland

Mon 7/14

7:35 pm-4:54 am

1 stop7h 19m

$377

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 6/25

7:29 pm-11:28 pm

1 stop5h 59m

$100

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 19 results
1
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Best time to book a flight from St. Louis to Portland

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Portland. Price data was last updated on June 13, 2025.

Booking 89 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Portland. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, November is the cheapest month in which you can book a flight from St. Louis to Portland (average of $277). Flying from St. Louis to Portland in March is currently the most expensive (average of $369). 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 STL to PDX?

Find hourly flight availability from St. Louis to Portland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 18, 2025.

When flying from St. Louis to Portland, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 32% versus a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Portland. Price data was last updated on December 16, 2024.

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

Rainfall in Portland by month

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

In terms of precipitation, rainfall in Portland ranges from 0.7 - 5.6 inches per month. November is typically the wettest month, when rainfall can reach 5.6 in. July is typically the driest time to visit Portland when rainfall is around 0.7 in.

Temperature in Portland by month

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

If weather is an important factor for your trip to Portland, 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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Portland

Get insights into the airlines that provide service to Portland. 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 Portland. Reviews last updated June 18, 2025.
Read through reviews of airlines operating flights from St. Louis to Portland, 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
10,000 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

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

Comfort

7.8

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

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
4,280 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

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
7,964 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

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
2,507 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

Boarding

8.1

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
8,810 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

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

  • How popular is this St. Louis to Portland flight route?

    Within the past month, 1 users have taken a look at flights from Lambert-St Louis to Portland.

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

    Currently priced at $292, Southwest will fly you from St. Louis to Portland and back. In addition to Southwest, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Alaska Airlines and American Airlines - these airlines can fly you to your destination from $296 and $297, respectively. These flights start at 17% lower than the current average price 3 months from now.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $100. Hawaiian Airlines flights start at $140 while deals on Sun Country Air start at $143 one-way.

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

    The cheapest flight price from St. Louis to Portland is $459. On average you can expect to pay $707. The most popular route, (Lambert-St Louis - Portland), can usually be booked for $296.

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

    St. Louis to Portland 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?

    Denver travelers tend to visit Coors Field, Paramount Theatre, and Larimer Square more than anywhere else. Coors Field, Paramount Theatre, and Larimer Square can be accessed by traveling approximately 18.4 mi, 18.6 mi, and 18.9 mi, respectively from Denver Intl. Those looking to explore during their layover in Denver can rent a car from Denver Intl for about $57 per day.

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

    Flights departing from St. Louis and landing in Portland layover in Salt Lake City least frequently.

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

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

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

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

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

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

    Currently, November is the cheapest month in which you can book a flight from St. Louis to Portland (average of $277). Flying from St. Louis to Portland in March is currently the most expensive (average of $369). 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
Seaside
Vancouver
Beaverton
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Hillsboro
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Long Beach
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Pacific City
Troutdale

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from St. Louis to Portland

Discover the top 6 airlines that operate flights from St. Louis to Portland. 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 June 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$186FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$170Average$356FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$215Average$350FlexibilityNo cancel feeOn-time75%
DeltaCheapest$216Average$341FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$226Average$435FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$226Average$400FlexibilityNo cancel feeOn-time69%

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