Which airport typically offers the quickest layover for flights from St. Louis to Portland?

Flights via Chicago (MDW) offer the fastest connection on this route, with an average layover time of 0h 48m.

What’s the cheapest layover airport for flights from St. Louis to Portland?

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $244.

What’s the top layover airport for flights from St. Louis to Portland?

Seattle (SEA) – chosen by Cheapflights users on 50% of 1-stop itineraries from St. Louis to Portland on Cheapflights.

What’s the fastest layover option from St. Louis to Portland?

Flights via Chicago (MDW) have the shortest average one-way travel time for 1-stop routes: 6h 05m.

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 United Airlines, Delta, and American Airlines fly from St. Louis to Portland in about 6h 52m. The time it takes to get you to your destination can typically vary by up to 2h 44m. 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 $108, 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 69% 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 $75. American Airlines flights start at $113 while deals on Alaska Airlines start at $113 one-way.

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.

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).

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

The cheapest flight price from St. Louis to Portland is $229. On average you can expect to pay $449. The most popular route, (Lambert-St Louis - Portland), can usually be booked for $216.

What are the most popular airlines that fly from St. Louis to Portland?

When booking a flight from St. Louis to Portland, you may want to consider flying on Delta, Southwest or United Airlines as they are the most popular for this route.

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.

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.

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 $42 per day.

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.

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.

$68+ Flights from St. Louis to Portland

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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.

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Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in September or January, booked 52 days in advance, depart on a Monday or Tuesday and return on a Monday

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 December 12, 2025.

Thu 12/255:00 amSTL - PDX

1 stop8h 25mSouthwest

Thu 1/12:05 pmPDX - STL

1 stop7h 05mSouthwest

Deal found 12/11

$344

Wed 12/246:05 amSTL - PDX

1 stop8h 55mDelta

Sat 1/32:11 pmPDX - STL

1 stop6h 05mDelta

Deal found 12/11

$419

Fri 12/129:00 amSTL - PDX

1 stop6h 37mUnited Airlines

Wed 1/712:59 pmPDX - STL

1 stop7h 01mUnited Airlines

Deal found 12/10

$421

Mon 12/226:44 pmSTL - PDX

1 stop8h 10mAmerican Airlines

Mon 1/510:21 pmPDX - STL

1 stop9h 19mAmerican Airlines

Deal found 12/10

$440

Tue 12/2310:10 pmSTL - PDX

2 stops39h 27mFrontier

Tue 12/3012:47 pmPDX - STL

1 stop19h 15mFrontier

Deal found 12/10

$494

Wed 12/244:45 pmSTL - PDX

1 stop7h 50mSouthwest

Sat 12/277:45 amPDX - STL

1 stop7h 30mSouthwest

Deal found 12/10

$498

Tue 12/166:30 amSTL - PDX

1 stop8h 10mDelta

Wed 12/175:30 amPDX - STL

1 stop6h 00mDelta

Deal found 12/10

$503

Tue 12/235:16 amSTL - PDX

1 stop7h 44mAmerican Airlines

Tue 12/303:02 pmPDX - STL

1 stop6h 42mAmerican Airlines

Deal found 12/10

$515

Best flights from St. Louis to Portland
Discover carefully curated flight deals from St. Louis to Portland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.

Sun 1/2511:20 amSTL - PDX

1 stop9h 36mUnited Airlines

Sun 2/112:59 pmPDX - STL

1 stop7h 01mUnited Airlines

Deal found 12/11

$249

Tue 2/173:38 pmSTL - PDX

1 stop6h 52mDelta

Mon 3/95:08 pmPDX - STL

1 stop5h 10mDelta

Deal found 12/11

$249

Mon 1/196:00 amSTL - PDX

1 stop7h 45mAmerican Airlines

Thu 1/226:00 amPDX - STL

1 stop6h 47mAmerican Airlines

Deal found 12/10

$249

Wed 1/711:20 amSTL - PDX

1 stop9h 36mUnited Airlines

Wed 1/145:00 amPDX - STL

1 stop6h 16mUnited Airlines

Deal found 12/10

$249

Wed 1/75:00 pmSTL - PDX

1 stop7h 54mDelta

Wed 1/145:50 amPDX - STL

1 stop6h 58mDelta

Deal found 12/10

$249

Wed 1/146:00 amSTL - PDX

1 stop8h 18mUnited Airlines

Wed 1/211:24 pmPDX - STL

1 stop5h 34mUnited Airlines

Deal found 12/11

$249

Sun 2/16:00 amSTL - PDX

1 stop8h 18mUnited Airlines

Tue 2/1011:05 pmPDX - STL

1 stop9h 36mUnited Airlines

Deal found 12/9

$249

Tue 2/38:45 amSTL - PDX

1 stop7h 01mUnited Airlines

Sat 2/71:24 pmPDX - STL

1 stop5h 34mUnited Airlines

Deal found 12/10

$249

Fri 1/99:57 amSTL - PDX

2 stops10h 13mUnited Airlines

Sun 1/117:51 pmPDX - STL

1 stop7h 20mUnited Airlines

Deal found 12/10

$254

Tue 1/276:30 amSTL - PDX

2 stops10h 25mUnited Airlines

Thu 1/2912:59 pmPDX - STL

1 stop7h 01mUnited Airlines

Deal found 12/9

$254

Last-minute flights from St. Louis to Portland
Discover last-minute flight deals from St. Louis to Portland. Data last updated December 12, 2025 and is based on user searches.

Thu 12/255:00 amSTL - PDX

1 stop8h 25mSouthwest

Thu 1/12:05 pmPDX - STL

1 stop7h 05mSouthwest

Deal found 12/11

$344

Wed 1/78:45 amSTL - PDX

2 stops12h 11mUnited Airlines

Wed 1/141:24 pmPDX - STL

1 stop5h 34mUnited Airlines

Deal found 12/10

$254

Thu 1/82:38 pmSTL - PDX

1 stop7h 13mAmerican Airlines

Mon 1/126:00 amPDX - STL

1 stop8h 14mAmerican Airlines

Deal found 12/11

$249

Thu 1/87:00 amSTL - PDX

1 stop7h 32mDelta

Sun 1/1111:10 amPDX - STL

2 stops10h 15mDelta

Deal found 12/10

$272

Fri 1/99:57 amSTL - PDX

2 stops10h 13mUnited Airlines

Sun 1/115:35 amPDX - STL

2 stops9h 20mUnited Airlines

Deal found 12/10

$303

Wed 1/146:35 amSTL - PDX

2 stops14h 15mDelta

Wed 1/211:30 pmPDX - STL

2 stops7h 55mDelta

Deal found 12/11

$356

Thu 1/153:37 pmSTL - PDX

1 stop9h 55mAmerican Airlines

Mon 1/1911:59 pmPDX - STL

1 stop9h 04mAmerican Airlines

Deal found 12/10

$293

Mon 1/196:10 amSTL - PDX

1 stop8h 36mDelta

Thu 1/2211:10 amPDX - STL

2 stops10h 15mDelta

Deal found 12/11

$307

Tue 1/203:31 pmSTL - PDX

2 stops10h 46mDelta

Thu 1/221:30 pmPDX - STL

2 stops7h 55mDelta

Deal found 12/9

$328

Sun 1/259:27 pmSTL - PDX

1 stop15h 51mFrontier

Sun 2/111:09 amPDX - STL

2 stops23h 41mFrontier

Deal found 12/11

$233

One-way flights from St. Louis to Portland
Search for one-way flight options from St. Louis to Portland. Find affordable one-way fares based on user searches. Data last updated December 12, 2025.

Wed 1/77:43 pmSTL - PDX

1 stop17h 32mFrontier

Deal found 12/11

$68

Sun 1/259:27 pmSTL - PDX

1 stop15h 51mFrontier

Deal found 12/11

$94

Sun 1/119:46 pmSTL - PDX

1 stop13h 48mFrontier

Deal found 12/11

$103

Thu 1/87:00 amSTL - PDX

1 stop7h 32mDelta

Deal found 12/10

$125

Sat 3/78:12 pmSTL - PDX

1 stop15h 57mFrontier

Deal found 12/11

$130

Tue 1/135:11 pmSTL - PDX

2 stops43h 53mFrontier

Deal found 12/11

$132

Tue 1/65:11 pmSTL - PDX

3 stops44h 04mMultiple Airlines

Deal found 12/10

$135

Sun 3/89:22 pmSTL - PDX

1 stop13h 36mFrontier

Deal found 12/11

$141

Fri 1/96:35 amSTL - PDX

2 stops14h 15mDelta

Deal found 12/11

$148

Wed 1/75:00 pmSTL - PDX

2 stops19h 07mDelta

Deal found 12/11

$154

Thu 1/83:43 pmSTL - PDX

2 stops19h 51mFrontier

Deal found 12/10

$157

Tue 1/65:11 pmSTL - PDX

2 stops44h 04mFrontier

Deal found 12/10

$160

Find flight deals from St. Louis to Portland

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$233 (Kiwi.com)
One-way from	$68 (Kiwi.com)
Popular in	March
Cheapest in	September
Average price	$382
Good round-trip deal	$337 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. 2% potential increase in price ($11 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 December 2025

Search Deals

Price to beat on a round-trip flight from Lambert-St Louis to Portland.

Search Deals

Cheapflights Fare Finder

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

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sun 1/25

11:20 am-6:56 pm

1 stop9h 36m

Portland

Sun 2/1

12:59 pm-10:00 pm

1 stop7h 01m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 2/17

3:38 pm-8:30 pm

1 stop6h 52m

Portland

Mon 3/9

5:08 pm-12:18 am

1 stop5h 10m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 1/19

6:00 am-11:45 am

1 stop7h 45m

Portland

Thu 1/22

6:00 am-2:47 pm

1 stop6h 47m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 1/7

11:20 am-6:56 pm

1 stop9h 36m

Portland

Wed 1/14

5:00 am-1:16 pm

1 stop6h 16m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 1/7

5:00 pm-10:54 pm

1 stop7h 54m

Portland

Wed 1/14

5:50 am-2:48 pm

1 stop6h 58m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 1/14

6:00 am-12:18 pm

1 stop8h 18m

Portland

Wed 1/21

1:24 pm-8:58 pm

1 stop5h 34m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sun 2/1

6:00 am-12:18 pm

1 stop8h 18m

Portland

Tue 2/10

11:05 pm-10:41 am

1 stop9h 36m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 2/3

8:45 am-1:46 pm

1 stop7h 01m

Portland

Sat 2/7

1:24 pm-8:58 pm

1 stop5h 34m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 1/9

9:57 am-6:10 pm

2 stops10h 13m

Portland

Sun 1/11

7:51 pm-5:11 am

1 stop7h 20m

$254

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 1/27

6:30 am-2:55 pm

2 stops10h 25m

Portland

Thu 1/29

12:59 pm-10:00 pm

1 stop7h 01m

$254

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 18 results

Compare providers for flights from St. Louis to Portland

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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star
Priceline	Price Accuracy1 star	Trust Score*3 stars
CheapOair	Price Accuracy3 stars	Trust Score*3 stars
Mytrip	Price Accuracy3 stars	Trust 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

Prices

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

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 $150). Flying from St. Louis to Portland in March is currently the most expensive (average of $267). 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?

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 in the evening.

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

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. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Portland

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

11,432 reviews

Reviews

1 / 20

2.0

Mediocre

Art,Dec 2025

SAN - OGG

It was a five hour flight and my seat did not recline. I have had three back surgeries and I’m solid bone for my L3 vertebrae all the way to my tailbone. My body has never hurt so much. There was no TV on this flight and only a small can of soda was free.

Alaska Airlines

8.0

Very good

11,432 reviews

Alaska Airlines

8.0

Very good

11,432 reviews

Reviews

1 / 20

2.0

Mediocre

Art,Dec 2025

SAN - OGG

Southwest

7.9

Good

4,253 reviews

Alaska Airlines

8.0

Very good

11,432 reviews

Reviews

1 / 20

2.0

Mediocre

Art,Dec 2025

SAN - OGG

Delta

7.9

Good

8,008 reviews

Alaska Airlines

8.0

Very good

11,432 reviews

Reviews

1 / 20

2.0

Mediocre

Art,Dec 2025

SAN - OGG

United Airlines

7.4

Good

9,095 reviews

Alaska Airlines

8.0

Very good

11,432 reviews

Reviews

1 / 20

2.0

Mediocre

Art,Dec 2025

SAN - OGG

American Airlines

7.2

Good

11,050 reviews

Alaska Airlines

8.0

Very good

11,432 reviews

Reviews

1 / 20

2.0

Mediocre

Art,Dec 2025

SAN - OGG

Related info for your journey

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 United Airlines, Delta, and American Airlines fly from St. Louis to Portland in about 6h 52m. The time it takes to get you to your destination can typically vary by up to 2h 44m. 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 $108, 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 69% 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 $75. American Airlines flights start at $113 while deals on Alaska 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 $229. On average you can expect to pay $449. The most popular route, (Lambert-St Louis - Portland), can usually be booked for $216.
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 $42 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 $150). Flying from St. Louis to Portland in March is currently the most expensive (average of $267). 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.

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Alternative routes for St. Louis to Portland

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Other flights to Portland

Top 7 airlines flying from St. Louis to Portland

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$137	Average$246	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$188	Average$342	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$223	Average$334	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$226	Average$401	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$231	Average$384	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$248	Average$388	FlexibilityNo cancel fee	On-time75%
Hawaiian Airlines	Cheapest$338	Average$520	FlexibilityNo cancel fee	On-time85%

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$68+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Portland with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in September or January, booked 52 days in advance, depart on a Monday or Tuesday and return on a Monday

Cheap flight deals from St. Louis to Portland

Cheapest flights from St. Louis to PortlandExplore 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 December 12, 2025.

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 December 12, 2025.

Find flight deals from St. Louis to Portland

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Cheapflights Fare Finder

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

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 December.

Best time to book a flight from St. Louis to Portland

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Everything you need to know about your flight from St. Louis to Portland

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What’s the top layover airport for flights from St. Louis to Portland?

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Reviews of airlines servicing Portland

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.

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?

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

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

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

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

What are some popular things to do or see while on a layover in Denver?

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

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

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

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

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

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Alternative routes for St. Louis to Portland

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Top 7 airlines flying from St. Louis to Portland

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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 December 12, 2025.