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$124+ 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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PDX
Aug 27 — Sep 31
Thu 8/27
Thu 9/3
1 adult, Economy
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Find cheap flights from St. Louis to Portland with Cheapflights

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Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in January or September, booked 59 days in advance, depart on a Tuesday or Friday and return on a Friday

Cheap 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 July 28, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/28. 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.
Sun 9/208:10 pm
STL
-
PDX
1 stop22h 25m
Frontier
Fri 9/2512:38 pm
PDX
-
STL
1 stop28h 39m
Frontier
Deal found 7/28$241
This CheapOair deal was found by Cheapflights users on 7/28. 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.
Tue 8/118:08 pm
STL
-
PDX
1 stop22h 28m
Frontier
Fri 8/145:49 pm
PDX
-
STL
1 stop22h 26m
Frontier
Deal found 7/28$258
This CheapOair deal was found by Cheapflights users on 7/28. 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.
Thu 10/112:17 pm
STL
-
PDX
1 stop25h 37m
Frontier
Mon 10/512:39 pm
PDX
-
STL
1 stop20h 53m
Frontier
Deal found 7/28$268
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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 9/126:08 pm
STL
-
PDX
Nonstop4h 12m
Alaska Airlines
Sat 9/1911:16 am
PDX
-
STL
Nonstop3h 54m
Alaska Airlines
Deal found 7/28$297
This CheapOair deal was found by Cheapflights users on 7/27. 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.
Fri 8/217:58 pm
STL
-
PDX
1 stop23h 13m
Frontier
Sun 8/231:47 pm
PDX
-
STL
1 stop26h 03m
Frontier
Deal found 7/27$298
This Kiwi.com deal was found by Cheapflights users on 7/26. 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 8/247:58 pm
STL
-
PDX
1 stop23h 13m
Frontier
Sun 8/3012:20 pm
PDX
-
STL
1 stop28h 53m
Frontier
Deal found 7/26$300
This Kiwi.com deal was found by Cheapflights users on 7/26. 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.
Thu 8/277:58 pm
STL
-
PDX
1 stop23h 13m
Frontier
Thu 9/312:20 pm
PDX
-
STL
2 stops27h 02m
Frontier
Deal found 7/26$304
This Kiwi.com deal was found by Cheapflights users on 7/27. 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 9/308:10 pm
STL
-
PDX
1 stop22h 25m
Frontier
Thu 10/812:34 pm
PDX
-
STL
2 stops19h 06m
Frontier
Deal found 7/27$305
This Kiwi.com deal was found by Cheapflights users on 7/26. 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 8/287:58 pm
STL
-
PDX
1 stop23h 13m
Frontier
Sat 9/512:20 pm
PDX
-
STL
1 stop28h 53m
Frontier
Deal found 7/26$306
This Southwest deal was found by Cheapflights users on 7/28. 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.
Sat 8/298:30 am
STL
-
PDX
Nonstop4h 10m
Southwest
Tue 9/15:50 am
PDX
-
STL
1 stop7h 15m
Southwest
Deal found 7/28$307
This CheapOair deal was found by Cheapflights users on 7/28. 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.
Thu 9/36:45 pm
STL
-
PDX
1 stop18h 03m
Frontier
Tue 9/85:56 pm
PDX
-
STL
1 stop23h 21m
Frontier
Deal found 7/28$308

Find 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 July 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$258
(CheapOair)

One-way from

$124
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$443

Good round-trip deal

$377 or less

Good one-way deal

$188 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. 9% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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

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 July 28, 2026.
Use the filters below to find and compare flights from St. Louis to Portland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 9/12

6:08 pm-8:20 pm

Nonstop4h 12m

Portland

Sat 9/19

11:16 am-5:10 pm

Nonstop3h 54m

$297

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 9/26

8:25 am-5:45 pm

2 stops11h 20m

Portland

Wed 9/30

7:05 am-6:20 pm

1 stop9h 15m

$322

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 9/22

7:35 am-12:25 pm

1 stop6h 50m

Portland

Mon 9/28

3:25 pm-11:55 pm

1 stop6h 30m

$323

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 10/30

5:05 am-9:50 am

1 stop6h 45m

Portland

Sun 11/1

3:55 pm-12:30 am

1 stop6h 35m

$324

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 11/12

7:15 pm-11:55 pm

1 stop6h 40m

Portland

Sun 11/15

3:55 pm-12:30 am

1 stop6h 35m

$329

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 11/6

7:20 pm-12:10 am

1 stop6h 50m

Portland

Mon 11/9

8:00 am-7:10 pm

2 stops9h 10m

$334

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 9/22

1:55 pm-11:54 pm

2 stops11h 59m

Portland

Mon 9/28

8:44 pm-8:40 am

2 stops9h 56m

$354

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 8/29

2:25 pm-9:05 pm

2 stops8h 40m

Portland

Sat 9/5

6:50 am-3:35 pm

2 stops6h 45m

$358

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 9/28

6:05 am-3:00 pm

2 stops10h 55m

Portland

Fri 10/9

3:30 pm-12:35 am

1 stop7h 05m

$359

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 9/8

10:29 am-10:31 pm

2 stops14h 02m

Portland

Tue 9/15

6:00 am-4:47 pm

1 stop8h 47m

$360

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 19 resultsSorted by cheapest first
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 July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy2 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapTicketsDealPrice Accuracy1 starTrust 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 FlightHub the most. FlightHub 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?

Booking 58 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 $292). Flying from St. Louis to Portland in July is currently the most expensive (average of $443). 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 July 28, 2026.

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 evening, which can drop the price by up to 41% versus a flight at noon.

How much does it cost to fly round-trip from St. Louis to Portland?

Airfare is below average for this route at the moment.

St. Louis to Portland flights typically cost between $301 and $462 in September.
The cheapest round-trip price found within the last 5 days was $241 on Frontier (Sep 20-Sep 25).

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 July 28, 2026.
Peruse reviews from past customers who have flown with Southwest,Alaska Airlines, andDelta 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.
Southwest
8.0
Very good
4,228 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Southwest
8.0
Very good
4,228 reviews
Southwest
8.0
Very good
4,228 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Alaska Airlines
7.9
Good
12,721 reviews
Southwest
8.0
Very good
4,228 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Delta
7.8
Good
8,483 reviews
Southwest
8.0
Very good
4,228 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
United Airlines
7.4
Good
10,048 reviews
Southwest
8.0
Very good
4,228 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
American Airlines
7.1
Good
11,839 reviews
Southwest
8.0
Very good
4,228 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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, 6 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 Frontier and Alaska Airlines fly from St. Louis to Portland in about 4h 12m. The time it takes to get you to your destination can typically vary by up to 18h 16m. 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 $167, 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 $186 and $198, respectively. These flights start at 54% 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 $79. American Airlines flights start at $105 while deals on United Airlines start at $114 one-way.

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

    The cheapest flight price from St. Louis to Portland is $168. On average you can expect to pay $352. The most popular route, (Lambert-St Louis - Portland), can usually be booked for $271.

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

    St. Louis to Portland 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?

    Salt Lake City travelers tend to visit Temple Square, Hogle Zoo, and Abravanel Hall more than anywhere else. Temple Square, Hogle Zoo, and Abravanel Hall can be accessed by traveling approximately 4.7 mi, 9.1 mi, and 4.7 mi, respectively from Salt Lake City. Those looking to explore during their layover in Salt Lake City can rent a car from Salt Lake City for about $62 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 Denver 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 $292). Flying from St. Louis to Portland in July is currently the most expensive (average of $443). 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
Beaverton
Seaside
Vancouver
Lincoln City
Longview
Lake Oswego
Hillsboro
Kelso
Clackamas
Troutdale
Cannon Beach
McMinnville
The Dalles
Wilsonville
Depoe Bay
Stevenson
Tillamook
Astoria
Gresham
Silverton

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 July 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$167Average$261FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$186Average$293FlexibilityNo cancel feeOn-time71%
DeltaCheapest$198Average$342FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$229Average$412FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$244Average$352FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$249Average$398FlexibilityNo cancel feeOn-time75%

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