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$114+ 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 6/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PDX
May 19 — May 261
Mon 5/19
Mon 5/26
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 May 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Priceline
3 stars

Round-trip from

$227
(Delta)

One-way from

$114
(Delta)

Popular in

March

Cheapest in

September

Average price

$333

Good round-trip deal

$434 or less
Provider with most accurate pricing for Lambert-St Louis-Portland flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Portland flights.
Search Deals
From Lambert-St Louis to Portland
Search Deals
One-way flight from Lambert-St Louis to Portland
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($26 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 May 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Portland.
Search Deals

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 May 14, 2025.

This Delta deal was found by Cheapflights users on 5/13. 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.
Fri 6/207:15 pmSTL - PDX
1 stop6h 24mDelta
Sun 6/2912:52 amPDX - STL
1 stop7h 40mDelta
Deal found 5/13$227
This CheapOair deal was found by Cheapflights users on 5/13. 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 5/287:55 pmSTL - PDX
1 stop16h 14mFrontier
Tue 6/36:35 amPDX - STL
1 stop25h 33mFrontier
Deal found 5/13$230
This United Airlines deal was found by Cheapflights users on 5/13. 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 6/104:32 pmSTL - PDX
1 stop6h 19mUnited Airlines
Sun 6/1511:59 pmPDX - STL
1 stop7h 40mUnited Airlines
Deal found 5/13$267
This American Airlines deal was found by Cheapflights users on 5/13. 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 6/205:29 pmSTL - PDX
1 stop9h 07mAmerican Airlines
Sun 6/2912:59 amPDX - STL
1 stop6h 19mAmerican Airlines
Deal found 5/13$273
This Expedia deal was found by Cheapflights users on 5/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/247:55 pmSTL - PDX
1 stop6h 22mMultiple Airlines
Sat 5/314:00 pmPDX - STL
1 stop6h 04mMultiple Airlines
Deal found 5/12$278
This Southwest deal was found by Cheapflights users on 5/13. 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 5/2811:05 amSTL - PDX
2 stops9h 55mSouthwest
Thu 5/291:30 pmPDX - STL
2 stops9h 20mSouthwest
Deal found 5/13$317
This Mytrip deal was found by Cheapflights users on 5/13. 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.
Sat 5/3110:10 amSTL - PDX
2 stops28h 32mSpirit Airlines
Fri 6/61:37 pmPDX - STL
2 stops17h 38mSpirit Airlines
Deal found 5/13$339
This Hawaiian Airlines deal was found by Cheapflights users on 5/12. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/207:00 amSTL - PDX
1 stop7h 18mHawaiian Airlines
Fri 5/231:25 pmPDX - STL
1 stop8h 39mHawaiian Airlines
Deal found 5/12$382
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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.
Fri 6/66:18 pmSTL - PDX
1 stop7h 26mAlaska Airlines
Sun 6/89:45 pmPDX - STL
2 stops24h 19mAlaska Airlines
Deal found 5/13$419

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 May 14, 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 6/20

7:15 pm-11:39 pm

1 stop6h 24m

Portland

Sun 6/29

12:52 am-10:32 am

1 stop7h 40m

$227

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/28

7:55 pm-10:09 am

1 stop16h 14m

Portland

Tue 6/3

6:35 am-10:08 am

1 stop25h 33m

$230

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 6/10

4:32 pm-8:51 pm

1 stop6h 19m

Portland

Sun 6/15

11:59 pm-9:39 am

1 stop7h 40m

$267

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 6/20

5:29 pm-12:36 am

1 stop9h 07m

Portland

Sun 6/29

12:59 am-9:18 am

1 stop6h 19m

$273

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 5/24

7:55 pm-12:17 am

1 stop6h 22m

Portland

Sat 5/31

4:00 pm-12:04 am

1 stop6h 04m

$278

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/28

11:05 am-7:00 pm

2 stops9h 55m

Portland

Thu 5/29

1:30 pm-12:50 am

2 stops9h 20m

$317

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 5/31

10:10 am-12:42 pm

2 stops28h 32m

Portland

Fri 6/6

1:37 pm-9:15 am

2 stops17h 38m

$339

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 6/6

6:18 pm-11:44 pm

1 stop7h 26m

Portland

Sun 6/8

9:45 pm-12:04 am

2 stops24h 19m

$419

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 6/13

7:15 pm-11:39 pm

1 stop6h 24m

$114

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 6/7

8:11 pm-12:19 am

1 stop6h 08m

$119

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/13

Showing 1-10 of 16 results
1
2

Compare providers for flights from St. Louis to Portland

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 St. Louis to Portland in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
PricelinePrice Accuracy2 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 St. Louis-Portland flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Portland flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Portland flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Portland flights, Cheapflights users trust Priceline the most. Priceline 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 St. Louis-Portland 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 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 May 9, 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 May 14, 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 May 14, 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

7.9

Crew

8.5

Boarding

8.1

Food

7.1

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

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.1

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
4,290 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.1

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
7,949 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.1

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
2,434 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.1

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
8,726 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Crew

8.5

Boarding

8.1

Food

7.1

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 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 $227, Delta will fly you from St. Louis to Portland and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and United Airlines - these airlines can fly you to your destination from $230 and $267, respectively. These flights start at 35% 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 Delta, which is currently one of the cheapest options available, starting at $114. Frontier flights start at $119 while deals on Hawaiian Airlines start at $134 one-way.

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

    The cheapest flight price from St. Louis to Portland is $388. On average you can expect to pay $530. The most popular route, (Lambert-St Louis - Portland), can usually be booked for $222.

  • 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 $43 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
Lincoln City
Beaverton
Clackamas
Vancouver
McMinnville
Lake Oswego
Hillsboro
Gresham
Astoria
Long Beach
Cannon Beach
Tigard
Hood River
Woodburn
Depoe Bay
Pacific City
Stevenson
Troutdale
Wilsonville

Browse thousands of different options on Cheapflights for your next trip

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Top 7 airlines flying from St. Louis to Portland

Discover the top 7 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 May 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$94Average$180FlexibilityNo cancel feeOn-time65%
FrontierCheapest$108Average$189FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$170Average$357FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$215Average$361FlexibilityNo cancel feeOn-time75%
DeltaCheapest$216Average$347FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$226Average$430FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$236Average$397FlexibilityNo cancel feeOn-time69%

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