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$60+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PDX
Feb 13 — Feb 201
Fri 2/13
Fri 2/20
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in February or September, booked 52 days in advance, depart on a Wednesday or Monday and return on a Monday

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 January 14, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$186
(Kiwi.com)

One-way from

$60
(Trip.com)

Popular in

March

Cheapest in

February

Average price

$325

Good round-trip deal

$283 or less

Good one-way deal

$134 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.
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From Lambert-St Louis to Portland
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One-way flight from Lambert-St Louis to Portland
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($5 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Portland.
Search Deals
Price to beat on a one-way 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 January 14, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/78:12 pm
STL
-
PDX
1 stop15h 57m
Frontier
Thu 3/1212:04 pm
PDX
-
STL
1 stop19h 45m
Frontier
Deal found 1/13$186
This Frontier deal was found by Cheapflights users on 1/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/2910:01 pm
STL
-
PDX
1 stop13h 48m
Frontier
Thu 2/511:28 am
PDX
-
STL
1 stop7h 38m
Frontier
Deal found 1/14$201
This Alaska Airlines deal was found by Cheapflights users on 1/13. 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.
Sat 9/56:20 pm
STL
-
PDX
Nonstop4h 10m
Alaska Airlines
Thu 9/1011:25 am
PDX
-
STL
Nonstop3h 48m
Alaska Airlines
Deal found 1/13$229
This United Airlines deal was found by Cheapflights users on 1/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:00 pm
STL
-
PDX
1 stop6h 38m
United Airlines
Sun 5/105:15 am
PDX
-
STL
1 stop5h 52m
United Airlines
Deal found 1/12$245
This Alaska Airlines deal was found by Cheapflights users on 1/13. 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.
Sat 9/56:20 pm
STL
-
PDX
Nonstop4h 10m
Alaska Airlines
Fri 9/1111:25 am
PDX
-
STL
Nonstop3h 48m
Alaska Airlines
Deal found 1/13$249
This Expedia deal was found by Cheapflights users on 1/12. 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.
Thu 1/2910:01 pm
STL
-
PDX
1 stop13h 48m
Multiple Airlines
Mon 2/21:38 pm
PDX
-
STL
1 stop22h 16m
Multiple Airlines
Deal found 1/12$250
This United Airlines deal was found by Cheapflights users on 1/13. 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.
Sat 11/74:30 pm
STL
-
PDX
1 stop6h 19m
United Airlines
Sat 11/145:15 am
PDX
-
STL
2 stops8h 06m
United Airlines
Deal found 1/13$254
This Alaska Airlines deal was found by Cheapflights users on 1/13. 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.
Sat 9/57:32 pm
STL
-
PDX
1 stop6h 38m
Alaska Airlines
Wed 9/911:25 am
PDX
-
STL
Nonstop3h 48m
Alaska Airlines
Deal found 1/13$259
This Delta deal was found by Cheapflights users on 1/13. 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.
Sat 9/56:30 am
STL
-
PDX
1 stop8h 24m
Delta
Sat 9/126:00 am
PDX
-
STL
1 stop5h 21m
Delta
Deal found 1/13$269
This United Airlines deal was found by Cheapflights users on 1/13. 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.
Wed 2/48:45 am
STL
-
PDX
2 stops12h 11m
United Airlines
Wed 2/111:24 pm
PDX
-
STL
1 stop5h 34m
United Airlines
Deal found 1/13$275
This Delta deal was found by Cheapflights users on 1/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/156:59 pm
STL
-
PDX
1 stop6h 42m
Delta
Tue 5/195:05 pm
PDX
-
STL
1 stop5h 31m
Delta
Deal found 1/12$279

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 January 14, 2026.
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

Wed 5/13

6:20 pm-8:37 pm

Nonstop4h 17m

Portland

Mon 5/18

11:18 am-5:06 pm

Nonstop3h 48m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 2/18

8:17 am-3:27 pm

1 stop9h 10m

Portland

Sat 2/21

7:00 am-4:02 pm

1 stop7h 02m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 3/4

3:40 pm-8:30 pm

1 stop6h 50m

Portland

Sat 3/7

1:32 pm-9:38 pm

1 stop6h 06m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 4/13

3:25 pm-8:07 pm

1 stop6h 42m

Portland

Sun 4/26

12:30 am-8:30 am

1 stop6h 00m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 4/17

6:45 pm-11:53 pm

1 stop7h 08m

Portland

Mon 4/20

5:08 pm-12:22 am

1 stop5h 14m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 4/20

6:45 pm-11:53 pm

1 stop7h 08m

Portland

Sun 4/26

12:30 am-8:30 am

1 stop6h 00m

$269

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 3/31

1:39 pm-9:53 pm

1 stop10h 14m

Portland

Sat 4/4

11:15 pm-9:46 am

1 stop8h 31m

$269

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 2/4

8:45 am-6:56 pm

2 stops12h 11m

Portland

Wed 2/11

1:24 pm-8:58 pm

1 stop5h 34m

$275

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 5/15

6:00 pm-10:38 pm

1 stop6h 38m

Portland

Fri 5/22

11:55 pm-10:27 am

1 stop8h 32m

$280

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 3/11

8:12 pm-11:09 am

1 stop16h 57m

$66

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

Showing 1-10 of 21 results
1
2
3

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
MytripPrice 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 St. Louis-Portland flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on St. Louis-Portland flight deals on Cheapflights vs. CheapOair >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 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 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 January 9, 2026.

Booking 52 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, January is the cheapest month in which you can book a flight from St. Louis to Portland (average of $173). Flying from St. Louis to Portland in March is currently the most expensive (average of $250). 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.

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 January 14, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from St. Louis to Portland to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,713 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
8.0
Very good
11,713 reviews
Alaska Airlines
8.0
Very good
11,713 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Southwest
8.0
Very good
4,258 reviews
Alaska Airlines
8.0
Very good
11,713 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,048 reviews
Alaska Airlines
8.0
Very good
11,713 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
United Airlines
7.4
Good
9,163 reviews
Alaska Airlines
8.0
Very good
11,713 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
American Airlines
7.2
Good
11,129 reviews
Alaska Airlines
8.0
Very good
11,713 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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.

  • How long is the flight from St. Louis to Portland?

    Airlines like Alaska Airlines, United Airlines, and Delta fly from St. Louis to Portland in about 4h 17m. The time it takes to get you to your destination can typically vary by up to 4h 53m. St. Louis and Portland are separated by a distance of 1702 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Currently priced at $132, Frontier will fly you from St. Louis to Portland and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and Delta - these airlines can fly you to your destination from $188 and $216, respectively. These flights start at 63% 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 $76. Alaska Airlines flights start at $113 while deals on American Airlines start at $113 one-way.

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

    The cheapest flight price from St. Louis to Portland is $134. On average you can expect to pay $238. The most popular route, (Lambert-St Louis - Portland), can usually be booked for $225.

  • 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, 16th Street Mall, and Paramount Theatre more than anywhere else. Coors Field, 16th Street Mall, and Paramount Theatre can be accessed by traveling approximately 18.4 mi, 18.7 mi, and 18.6 mi, respectively from Denver Intl. Those looking to explore during their layover in Denver can rent a car from Denver Intl for about $49 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, January is the cheapest month in which you can book a flight from St. Louis to Portland (average of $173). Flying from St. Louis to Portland in March is currently the most expensive (average of $250). 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
Vancouver
Seaside
Clackamas
Lincoln City
Longview
Lake Oswego
Beaverton
Hillsboro
Troutdale
Cannon Beach
Long Beach
McMinnville
Tigard
The Dalles
Depoe Bay
Stevenson
Wilsonville
Tillamook
Pacific City
Gresham

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 January 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$139Average$247FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$188Average$331FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$216Average$394FlexibilityNo cancel feeOn-time63%
DeltaCheapest$222Average$330FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$244Average$383FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$248Average$385FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$338Average$520FlexibilityNo cancel feeOn-time85%

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