How many flights depart from St. Louis to Portland on average per week?

The number of flights available between St. Louis and Portland is 2 per week as of August 2026. The most frequent departure day is Tue, with 50% of weekly flights leaving on this day.

Which airport is the most popular layover for flights between St. Louis and Portland?

Salt Lake City (SLC) was the most common stop: 44% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from St. Louis to Portland?

Flights via Dallas (DFW) offer the lowest average round-trip price of $243.

What is the cheapest airline that flies from Lambert-St Louis to Portland?

Alaska Airlines and Delta are the most popular carriers operating from Lambert-St Louis to Portland

Which layover airport has the shortest travel time from St. Louis to Portland?

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 5h 50m.

Which layover airport has the shortest connection time from St. Louis to Portland?

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 05m.

What airlines fly to Portland?

Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to Portland from St. Louis according to our data. Alaska Airlines is the first choice among our users, with 39% of people opting to fly with this airline when traveling to Portland. Keep in mind that there are 6 different airlines that fly to Portland on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Lambert-St Louis Airport to Portland Airport?

Prices for flights from Lambert-St Louis Airport to Portland Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Lambert-St Louis Airport to Portland Airport?

The number of operators available for flights from Lambert-St Louis Airport to Portland Airport is 6 as of August 2026.

How old do you have to be to fly from Lambert-St Louis Airport to Portland Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Portland Airport.

What documentation or ID do you need to fly to Portland Airport?

The travel and health documents you'll need for your trip to Portland Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Portland Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$111 Cheap Flights from St. Louis to Portland in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Portland

Round-trip

One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

1:02 pm - 11:43 amSTL Lambert-St Louis-PDX Portland

24h 41m1 stop Denver Intl

12:38 pm - 7:17 pmPDX Portland-STL Lambert-St Louis

28h 39m1 stop Denver Intl

$231Frontier

Sun, Sep 13 - Thu, Sep 24

1:02 pm - 11:43 amSTL Lambert-St Louis-PDX Portland

24h 41m1 stop Denver Intl

12:38 pm - 7:17 pmPDX Portland-STL Lambert-St Louis

28h 39m1 stop Denver Intl

$239Frontier

Sun, Sep 13 - Fri, Sep 18

6:08 pm - 8:20 pmSTL Lambert-St Louis-PDX Portland

4h 12mnonstop

11:16 am - 5:10 pmPDX Portland-STL Lambert-St Louis

3h 54mnonstop

$297Alaska Airlines

Tue, Sep 15 - Tue, Sep 22

6:08 pm - 8:20 pmSTL Lambert-St Louis-PDX Portland

4h 12mnonstop

11:16 am - 5:10 pmPDX Portland-STL Lambert-St Louis

3h 54mnonstop

$297Alaska Airlines

Sat, Sep 12 - Wed, Sep 23

8:30 am - 10:40 amSTL Lambert-St Louis-PDX Portland

4h 10mnonstop

7:05 am - 4:25 pmPDX Portland-STL Lambert-St Louis

7h 20m1 stop Phoenix Sky Harbor Intl

$307Southwest

Sat, Sep 19 - Wed, Sep 23

4:40 pm - 9:05 pmSTL Lambert-St Louis-PDX Portland

6h 25m1 stop Denver Intl

9:00 am - 6:39 pmPDX Portland-STL Lambert-St Louis

7h 39m1 stop San Francisco

$312United Airlines

Tue, Sep 1 - Wed, Sep 2

5:34 pm - 10:30 pmSTL Lambert-St Louis-PDX Portland

6h 56m1 stop Chicago O'Hare Intl

7:00 am - 3:43 pmPDX Portland-STL Lambert-St Louis

6h 43m1 stop Chicago O'Hare Intl

$317United Airlines

Sat, Oct 31 - Sat, Nov 7

5:20 pm - 9:25 pmSTL Lambert-St Louis-PDX Portland

6h 05m1 stop Denver Intl

11:30 pm - 9:15 amPDX Portland-STL Lambert-St Louis

7h 45m1 stop Chicago Midway

$317Southwest

Sat, Sep 19 - Wed, Sep 23

1:49 pm - 7:36 pmSTL Lambert-St Louis-PDX Portland

7h 47m1 stop Chicago O'Hare Intl

6:00 am - 2:44 pmPDX Portland-STL Lambert-St Louis

6h 44m1 stop Dallas/Fort Worth

$317American Airlines

Sat, Sep 12 - Sat, Sep 19

5:42 am - 10:54 amSTL Lambert-St Louis-PDX Portland

7h 12m1 stop Dallas/Fort Worth

7:00 am - 6:04 pmPDX Portland-STL Lambert-St Louis

9h 04m1 stop Dallas/Fort Worth

$317American Airlines

Tue, Sep 8 - Tue, Sep 15

Cheap last minute flights

Enter your travel dates to find the best prices.

7:10 pm - 4:54 pmSTL Lambert-St Louis-PDX Portland

23h 44m1 stop Las Vegas Harry Reid Intl

5:49 pm - 5:50 pmPDX Portland-STL Lambert-St Louis

22h 01m1 stop Las Vegas Harry Reid Intl

$344Frontier

Thu, Aug 6 - Mon, Aug 17

7:10 pm - 4:54 pmSTL Lambert-St Louis-PDX Portland

23h 44m1 stop Las Vegas Harry Reid Intl

5:49 pm - 6:05 pmPDX Portland-STL Lambert-St Louis

22h 16m1 stop Las Vegas Harry Reid Intl

$397Frontier

Thu, Aug 6 - Mon, Aug 10

8:00 am - 1:52 pmSTL Lambert-St Louis-PDX Portland

7h 52m1 stop Phoenix Sky Harbor Intl

11:34 pm - 8:24 amPDX Portland-STL Lambert-St Louis

6h 50m1 stop Chicago O'Hare Intl

$451American Airlines

Sun, Aug 9 - Sun, Aug 16

8:00 am - 1:52 pmSTL Lambert-St Louis-PDX Portland

7h 52m1 stop Phoenix Sky Harbor Intl

11:34 pm - 8:24 amPDX Portland-STL Lambert-St Louis

6h 50m1 stop Chicago O'Hare Intl

$451American Airlines

Thu, Aug 6 - Mon, Aug 17

6:20 am - 10:47 amSTL Lambert-St Louis-PDX Portland

6h 27m1 stop Minneapolis St Paul

1:30 pm - 11:26 pmPDX Portland-STL Lambert-St Louis

7h 56m1 stop Minneapolis St Paul

$510Delta

Sat, Aug 8 - Fri, Aug 14

5:37 pm - 7:47 pmSTL Lambert-St Louis-PDX Portland

4h 10mnonstop

6:49 pm - 6:15 pmPDX Portland-STL Lambert-St Louis

21h 26m1 stop Las Vegas Harry Reid Intl

$517Multiple Airlines

Sun, Aug 9 - Sun, Aug 16

8:30 am - 10:40 amSTL Lambert-St Louis-PDX Portland

4h 10mnonstop

2:05 pm - 9:35 pmPDX Portland-STL Lambert-St Louis

5h 30m1 stop Denver Intl

$616Southwest

Sat, Aug 8 - Sat, Aug 15

8:30 am - 10:40 amSTL Lambert-St Louis-PDX Portland

4h 10mnonstop

6:50 am - 3:30 pmPDX Portland-STL Lambert-St Louis

6h 40m2 stops Denver Intl Omaha Eppley Airfield

$621Southwest

Sat, Aug 8 - Sat, Aug 15

11:13 am - 5:34 pmSTL Lambert-St Louis-PDX Portland

8h 21m1 stop Minneapolis St Paul

11:20 pm - 9:37 amPDX Portland-STL Lambert-St Louis

8h 17m1 stop Detroit Metropolitan Wayne County

$626Delta

Thu, Aug 6 - Mon, Aug 10

5:10 am - 12:07 pmSTL Lambert-St Louis-PDX Portland

8h 57m2 stops Denver Intl San Francisco

7:16 am - 3:38 pmPDX Portland-STL Lambert-St Louis

6h 22m1 stop Chicago O'Hare Intl

$641United Airlines

Sat, Aug 8 - Fri, Aug 14

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Frontier flights from St. Louis to Portland

Our best Frontier deals on St. Louis to Portland flight tickets

Frontier

Sep 13

STL1:02 pmLambert-St Louis

24h 41m

1 stop

PDX11:43 amPortland

Sep 24

PDX12:38 pmPortland

28h 39m

1 stop

STL7:17 pmLambert-St Louis

$231

Frontier

Sep 13

STL1:02 pmLambert-St Louis

24h 41m

1 stop

PDX11:43 amPortland

Sep 18

PDX12:38 pmPortland

28h 39m

1 stop

STL7:17 pmLambert-St Louis

$239

Frontier

Sep 25

STL12:17 pmLambert-St Louis

25h 19m

1 stop

PDX11:36 amPortland

Sep 28

PDX12:39 pmPortland

20h 53m

1 stop

STL11:32 amLambert-St Louis

$240

United Airlines flights from St. Louis to Portland

Our best United Airlines deals on St. Louis to Portland flight tickets

United Airlines

Aug 19

STL9:30 amLambert-St Louis

8h 26m

1 stop

PDX3:56 pmPortland

Aug 26

PDX5:00 amPortland

5h 40m

1 stop

STL12:40 pmLambert-St Louis

$478

United Airlines

Aug 15

STL4:40 pmLambert-St Louis

6h 25m

1 stop

PDX9:05 pmPortland

Aug 22

PDX8:40 amPortland

11h 20m

2 stops

STL10:00 pmLambert-St Louis

$483

United Airlines

Aug 15

STL5:10 amLambert-St Louis

8h 50m

2 stops

PDX12:00 pmPortland

Aug 22

PDX10:50 amPortland

9h 10m

2 stops

STL10:00 pmLambert-St Louis

$488

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Sun 9/13

1:02 pm-11:43 am

1 stop24h 41m

Portland

Thu 9/24

12:38 pm-7:17 pm

1 stop28h 39m

$231

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Sun 9/13

1:02 pm-11:43 am

1 stop24h 41m

Portland

Fri 9/18

12:38 pm-7:17 pm

1 stop28h 39m

$239

Quickest round-trip

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Tue 9/15

6:08 pm-8:20 pm

Nonstop4h 12m

Portland

Tue 9/22

11:16 am-5:10 pm

Nonstop3h 54m

$297

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Sat 9/12

6:08 pm-8:20 pm

Nonstop4h 12m

Portland

Wed 9/23

11:16 am-5:10 pm

Nonstop3h 54m

$297

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Sat 9/19

8:30 am-10:40 am

Nonstop4h 10m

Portland

Wed 9/23

7:05 am-4:25 pm

1 stop7h 20m

$307

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Tue 9/1

4:40 pm-9:05 pm

1 stop6h 25m

Portland

Wed 9/2

9:00 am-6:39 pm

1 stop7h 39m

$312

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Sat 10/31

5:34 pm-10:30 pm

1 stop6h 56m

Portland

Sat 11/7

7:00 am-3:43 pm

1 stop6h 43m

$317

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Sat 9/19

5:20 pm-9:25 pm

1 stop6h 05m

Portland

Wed 9/23

11:30 pm-9:15 am

1 stop7h 45m

$317

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Sat 9/12

1:49 pm-7:36 pm

1 stop7h 47m

Portland

Sat 9/19

6:00 am-2:44 pm

1 stop6h 44m

$317

St. LouisPortland

STL Lambert-St Louis - PDX Portland

STLPDX

Lambert-St Louis

Tue 9/8

5:42 am-10:54 am

1 stop7h 12m

Portland

Tue 9/15

7:00 am-6:04 pm

1 stop9h 04m

$317

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Portland

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

Other information

What is the typical price of a round-trip flight between St. Louis and Portland?

Prices are currently low for flights on this route.

Typical prices usually range from $301 to $462.
The lowest price recently found on this route was $231.

What is the cheapest month to fly to Portland?

The cheapest month to fly to Portland from St. Louis is in January. Flight prices, which tend to average around $292, are often lower during this time because this is during the off-season. If you don’t want to visit Portland in January, then you should wait until September to fly from St. Louis, when ticket prices are also cheap, with an average price of $302.

What is the cheapest day to depart on your flight to Portland?

The cheapest day to depart on your flight to Portland is on a Tuesday when prices can be found for as low as $377. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Portland is Sunday, with ticket prices averaging around $484.

What is the cheapest Lambert-St Louis to Portland flight route?

Fly from Lambert-St Louis to Portland for the best Lambert-St Louis - Portland flight prices

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

You are more likely to see cheaper flights to Portland from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Portland for around $364 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portland from St. Louis for as low as $283 on momondo.

What cabin class options are available on St. Louis to Portland flights?

There are 3 cabin classes available to choose from on St. Louis to Portland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have St. Louis to Portland flight prices changed over time?

As of August 2026, prices for St. Louis to Portland flights are approximately 17% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to Portland

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Portland according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Portland (STL to PDX) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Portland

Best Price Found	$188
Fastest flight time	4h 10m
Direct flights	Every day
Airports in Portland	1 airport

The best one-way flight to Portland from St. Louis in the past 72 hours is $188. The best round-trip flight deal from St. Louis to Portland found on momondo in the last 72 hours is $338.

The fastest flight from St. Louis to Portland takes 4h 10m

Direct flights go from St. Louis to Portland every day.

There is 1 airport in Portland. From St. Louis there are direct flights to Portland (PDX).

Search flight deals

Frequently asked questions about flying from St. Louis to Portland

How far is Lambert-St Louis to Portland by plane?
Portland is 1718.1 mi away from Lambert-St Louis. Typically, this will take 4h 10m by plane in normal conditions.
When did momondo last update prices for flights from Lambert-St Louis Airport to Portland Airport?
Prices for flights from Lambert-St Louis Airport to Portland Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Portland Airport?
The number of operators available for flights from Lambert-St Louis Airport to Portland Airport is 6 as of August 2026.
How old do you have to be to fly from Lambert-St Louis Airport to Portland Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Portland Airport.
What documentation or ID do you need to fly to Portland Airport?
The travel and health documents you'll need for your trip to Portland Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Portland Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Portland?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from St. Louis to Portland is Boeing 737 MAX 9 (31.75% of total bookings). The next most popular plane models are Boeing 737-800 Passenger/BBJ2 (winglets) (22.22%), Boeing 737 MAX 8 (19.05%), and Boeing 737 (15.87%).
What is the most popular airline from St. Louis to Portland?
Based on momondo bookings for this flight route, the most popular airline on flight routes from St. Louis to Portland is Alaska Airlines (34% of total bookings). The next most popular airlines are Delta (21%), United Airlines (19%), and Southwest (13%).

Best airlines flying from St. Louis to Portland

Compare and see reviews for airlines that fly from St. Louis to Portland with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $167	Free Cancellation	Rating 5.6 2,733 reviews	Search Frontier flights
American Airlines	PriceFrom $186	Free Cancellation	Rating 7.1 11,847 reviews	Search American Airlines flights
Delta	PriceFrom $198	Free Cancellation	Rating 7.8 8,488 reviews	Search Delta flights
Southwest	PriceFrom $229	Free Cancellation	Rating 8.0 4,219 reviews	Search Southwest flights
United Airlines	PriceFrom $244	Free Cancellation	Rating 7.4 10,060 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $249	Free Cancellation	Rating 7.9 12,766 reviews	Search Alaska Airlines flights

Alaska Airlines Flights From St. Louis to Portland
Alaska Airlines is one of the most popular airlines flying from St. Louis to Portland, operating 2 flights/week on average for this route. A good Alaska Airlines flight deal for St. Louis to Portland starts from $249 round-trip, up to an average price of $395. Our users have rated Alaska Airlines at 7.9/10.

Lincoln City

Seaside

Vancouver

Cannon Beach

Salem

Astoria

Long Beach

Beaverton

Rockaway Beach

Hillsboro

Tigard

Depoe Bay

Longview

Hood River

Newberg

Clackamas

Troutdale

Gresham

Kelso

Wilsonville

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Portland?

Finding the right flight to Portland from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Portland quick and easy, saving you time and money.

Can I find flights from St. Louis to Portland with flexible booking policies on momondo?

Flights from St. Louis to Portland with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Portland?

Once all potential St. Louis to Portland flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Portland right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Portland, momondo offers a useful price alert feature which will track prices for flights to Portland from St. Louis and alert you when they change.

An easier way to manage your Portland trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Eugene Airport

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Cheap flights from St. Louis to Portland from $111

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Portland departing on 9/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from St. Louis to Portland

Our best Frontier deals on St. Louis to Portland flight tickets

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Our best United Airlines deals on St. Louis to Portland flight tickets

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How to get the cheapest flight ticket from St. Louis to Portland

What is the typical price of a round-trip flight between St. Louis and Portland?

What is the cheapest month to fly to Portland?

What is the cheapest day to depart on your flight to Portland?

What is the cheapest Lambert-St Louis to Portland flight route?

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

What cabin class options are available on St. Louis to Portland flights?

How have St. Louis to Portland flight prices changed over time?

What is the cheapest airline that flies from Lambert-St Louis to Portland?

What airlines fly to Portland?

Which airport is the most popular layover for flights between St. Louis and Portland?

Which layover airport offers the lowest fares from St. Louis to Portland?

Which layover airport has the shortest travel time from St. Louis to Portland?

Which layover airport has the shortest connection time from St. Louis to Portland?

How many flights depart from St. Louis to Portland on average per week?

When to book flights from St. Louis to Portland

Cheap St. Louis to Portland (STL to PDX) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Airports in Portland

Frequently asked questions about flying from St. Louis to Portland

Best airlines flying from St. Louis to Portland

Compare and see reviews for airlines that fly from St. Louis to Portland with momondo

Traveling to a place near Portland?

Why use momondo?

An easier way to manage your Portland trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Oregon

Fly your favorite airline to Portland

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Portland

List of cabin classes available on flights landing in Portland. Availability may vary depending on flight origin and airline.

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