HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portland

$86+ 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 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PDX
Apr 28 — May 51
Tue 4/28
Tue 5/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Portland with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in January or September, booked 66 days in advance, depart on a Tuesday or Friday and return on a Wednesday

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 March 29, 2026.

This Delta deal was found by Cheapflights users on 3/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:45 pm
STL
-
PDX
1 stop7h 08m
Delta
Wed 5/131:40 pm
PDX
-
STL
1 stop8h 50m
Delta
Deal found 3/26$205
This Southwest deal was found by Cheapflights users on 3/24. 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.
Tue 4/141:45 pm
STL
-
PDX
2 stops9h 00m
Southwest
Tue 4/2111:55 pm
PDX
-
STL
1 stop7h 35m
Southwest
Deal found 3/24$206
This CheapOair deal was found by Cheapflights users on 3/24. 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 4/178:06 pm
STL
-
PDX
1 stop17h 36m
Frontier
Mon 4/2011:48 am
PDX
-
STL
1 stop5h 44m
Frontier
Deal found 3/24$216
This Delta deal was found by Cheapflights users on 3/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/131:59 pm
STL
-
PDX
1 stop10h 03m
Delta
Mon 5/1811:12 pm
PDX
-
STL
1 stop8h 17m
Delta
Deal found 3/26$224
This Delta deal was found by Cheapflights users on 3/25. 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.
Tue 4/142:20 pm
STL
-
PDX
1 stop5h 48m
Delta
Tue 4/2111:15 pm
PDX
-
STL
1 stop8h 27m
Delta
Deal found 3/25$225
This CheapOair deal was found by Cheapflights users on 3/29. 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.
Sat 5/98:08 pm
STL
-
PDX
1 stop22h 38m
Frontier
Mon 5/118:46 pm
PDX
-
STL
1 stop19h 20m
Frontier
Deal found 3/29$236
This United Airlines deal was found by Cheapflights users on 3/24. 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 5/271:38 pm
STL
-
PDX
1 stop6h 06m
United Airlines
Sat 5/3011:59 pm
PDX
-
STL
1 stop8h 08m
United Airlines
Deal found 3/24$237
This Southwest deal was found by Cheapflights users on 3/24. 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 4/295:30 am
STL
-
PDX
2 stops10h 20m
Southwest
Thu 4/303:00 pm
PDX
-
STL
1 stop7h 15m
Southwest
Deal found 3/24$238
This Kiwi.com deal was found by Cheapflights users on 3/26. 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 6/59:21 pm
STL
-
PDX
2 stops21h 25m
Frontier
Tue 6/95:42 pm
PDX
-
STL
1 stop23h 41m
Frontier
Deal found 3/26$239
This Kiwi.com deal was found by Cheapflights users on 3/26. 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.
Sat 4/258:17 pm
STL
-
PDX
1 stop16h 03m
Frontier
Sat 5/212:27 pm
PDX
-
STL
1 stop28h 54m
Frontier
Deal found 3/26$240
This CheapOair deal was found by Cheapflights users on 3/27. 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.
Thu 5/288:08 pm
STL
-
PDX
1 stop22h 38m
Frontier
Mon 6/112:35 pm
PDX
-
STL
1 stop28h 48m
Frontier
Deal found 3/27$241
This United Airlines deal was found by Cheapflights users on 3/24. 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.
Thu 4/166:00 am
STL
-
PDX
1 stop8h 34m
United Airlines
Sat 4/1811:59 pm
PDX
-
STL
1 stop6h 26m
United Airlines
Deal found 3/24$243

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 March 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$205
(Delta)

One-way from

$86
(Expedia)

Popular in

March

Cheapest in

January

Average price

$472

Good round-trip deal

$269 or less

Good one-way deal

$144 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. 8% potential increase in price ($32 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 March 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 March 29, 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

Thu 5/7

7:59 pm-11:44 pm

1 stop5h 45m

Portland

Tue 5/12

5:05 pm-12:30 am

1 stop5h 25m

$224

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 6/5

6:30 pm-11:55 pm

1 stop7h 25m

Portland

Mon 6/8

11:30 pm-9:35 am

1 stop8h 05m

$264

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 5/29

3:11 pm-8:11 pm

1 stop7h 00m

Portland

Mon 6/1

5:05 pm-12:30 am

1 stop5h 25m

$309

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 5/21

5:45 am-4:20 pm

2 stops12h 35m

Portland

Tue 5/26

11:55 pm-9:30 am

1 stop7h 35m

$312

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 6/24

5:41 pm-11:53 pm

1 stop8h 12m

Portland

Thu 7/2

4:15 pm-11:57 pm

1 stop5h 42m

$327

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/6

5:59 pm-10:54 pm

1 stop6h 55m

Portland

Sat 5/9

7:45 pm-8:39 am

2 stops10h 54m

$329

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/13

5:33 pm-7:50 pm

Nonstop4h 17m

Portland

Sat 5/16

5:00 am-3:16 pm

1 stop8h 16m

$332

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 4/22

1:46 pm-9:42 pm

1 stop9h 56m

Portland

Sun 4/26

9:05 am-12:25 am

2 stops13h 20m

$335

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 5/9

2:05 pm-10:05 pm

2 stops10h 00m

Portland

Mon 5/11

5:10 am-3:25 pm

1 stop8h 15m

$348

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 5/28

3:50 pm-12:55 am

2 stops11h 05m

Portland

Sun 5/31

11:55 pm-10:15 am

1 stop8h 20m

$377

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 22 resultsSorted by cheapest first
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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
MytripPrice 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 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?

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 March 13, 2026.

Booking 66 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 $165). Flying from St. Louis to Portland in March is currently the most expensive (average of $248). 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 March 29, 2026.

When flying from St. Louis to Portland, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

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 March 29, 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
4,331 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,331 reviews
Southwest
8.0
Very good
4,331 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Alaska Airlines
7.9
Good
12,134 reviews
Southwest
8.0
Very good
4,331 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,359 reviews
Southwest
8.0
Very good
4,331 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,509 reviews
Southwest
8.0
Very good
4,331 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,521 reviews
Southwest
8.0
Very good
4,331 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 Delta, Southwest, and United Airlines fly from St. Louis to Portland in about 5h 45m. The time it takes to get you to your destination can typically vary by up to 2h 27m. 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 $149, 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 $209, respectively. These flights start at 57% 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. Southwest flights start at $113 while deals on American 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 $134. On average you can expect to pay $302. The most popular route, (Lambert-St Louis - Portland), can usually be booked for $224.

  • 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 $53 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 $165). Flying from St. Louis to Portland in March is currently the most expensive (average of $248). 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
Clackamas
Troutdale
Cannon Beach
Long Beach
McMinnville
Tigard
The Dalles
Wilsonville
Depoe Bay
Stevenson
Tillamook
Astoria
Pacific City

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 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 March 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$149Average$247FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$188Average$321FlexibilityNo cancel feeOn-time71%
DeltaCheapest$209Average$320FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$226Average$384FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$228Average$356FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$249Average$344FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2026 Cheapflights