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Cheap flights from St. Louis to Portland from $107

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 10/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Portland

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:10 pm - 11:43 am
STL
-
PDX
17h 33m
1 stop
Frontier Logo
12:38 pm - 7:17 pm
PDX
-
STL
28h 39m
1 stop
$222Frontier
Sun, Sep 20 - Fri, Sep 25
Frontier Logo
8:10 pm - 11:43 am
STL
-
PDX
17h 33m
1 stop
Frontier Logo
12:38 pm - 7:17 pm
PDX
-
STL
28h 39m
1 stop
$231Frontier
Wed, Sep 23 - Thu, Oct 1
Multiple Airlines Logo
6:08 pm - 8:20 pm
STL
-
PDX
4h 12mnonstop
Multiple Airlines Logo
12:20 pm - 7:13 pm
PDX
-
STL
28h 53m
1 stop
$272Multiple Airlines
Sat, Aug 29 - Sat, Sep 5
Alaska Airlines Logo
6:29 am - 4:36 pm
STL
-
PDX
12h 07m
2 stops
Alaska Airlines Logo
11:16 am - 5:10 pm
PDX
-
STL
3h 54mnonstop
$285Alaska Airlines
Wed, Sep 16 - Wed, Sep 23
Alaska Airlines Logo
6:08 pm - 8:20 pm
STL
-
PDX
4h 12mnonstop
Alaska Airlines Logo
11:16 am - 5:10 pm
PDX
-
STL
3h 54mnonstop
$297Alaska Airlines
Sat, Sep 12 - Sat, Sep 19
Southwest Logo
8:30 am - 10:40 am
STL
-
PDX
4h 10mnonstop
Southwest Logo
9:45 am - 3:30 pm
PDX
-
STL
3h 45mnonstop
$297Southwest
Sat, Aug 29 - Sat, Sep 5
Southwest Logo
8:30 am - 10:40 am
STL
-
PDX
4h 10mnonstop
Southwest Logo
6:50 am - 2:15 pm
PDX
-
STL
5h 25m
1 stop
$307Southwest
Sat, Aug 29 - Sat, Sep 5
Multiple Airlines Logo
6:00 am - 1:33 pm
STL
-
PDX
9h 33m
1 stop
Multiple Airlines Logo
12:20 pm - 7:13 pm
PDX
-
STL
28h 53m
1 stop
$312Multiple Airlines
Sat, Aug 29 - Sat, Sep 5
Delta Logo
10:31 am - 10:42 pm
STL
-
PDX
14h 11m
2 stops
Delta Logo
5:30 am - 5:44 pm
PDX
-
STL
10h 14m
2 stops
$313Delta
Sat, Oct 10 - Wed, Oct 14
Delta Logo
6:40 am - 5:04 pm
STL
-
PDX
12h 24m
2 stops
Delta Logo
11:31 am - 11:23 pm
PDX
-
STL
9h 52m
2 stops
$313Delta
Fri, Nov 13 - Sat, Nov 14

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Southwest flights from St. Louis to Portland

Our best Southwest deals on St. Louis to Portland flight tickets
Southwest
Aug 29
STL8:30 amLambert-St Louis
4h 10m
PDX10:40 amPortland
Sep 5
PDX9:45 amPortland
3h 45m
STL3:30 pmLambert-St Louis
$297
Southwest
Aug 29
STL8:30 amLambert-St Louis
4h 10m
PDX10:40 amPortland
Sep 5
PDX6:50 amPortland
5h 25m
1 stop
STL2:15 pmLambert-St Louis
$307
Southwest
Aug 29
STL8:30 amLambert-St Louis
4h 10m
PDX10:40 amPortland
Sep 5
PDX6:50 amPortland
6h 45m
2 stops
STL3:35 pmLambert-St Louis
$312

Frontier flights from St. Louis to Portland

Our best Frontier deals on St. Louis to Portland flight tickets
Frontier
Sep 20
STL8:10 pmLambert-St Louis
17h 33m
1 stop
PDX11:43 amPortland
Sep 25
PDX12:38 pmPortland
28h 39m
1 stop
STL7:17 pmLambert-St Louis
$222
Frontier
Sep 23
STL8:10 pmLambert-St Louis
17h 33m
1 stop
PDX11:43 amPortland
Oct 1
PDX12:38 pmPortland
28h 39m
1 stop
STL7:17 pmLambert-St Louis
$231
Frontier
Sep 20
STL8:10 pmLambert-St Louis
17h 33m
1 stop
PDX11:43 amPortland
Sep 24
PDX12:38 pmPortland
28h 39m
1 stop
STL7:17 pmLambert-St Louis
$232

momondo 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, momondo users made 832,500 searches. Data last updated July 31, 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

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sun 9/20

8:10 pm-11:43 am

1 stop17h 33m

Portland

Fri 9/25

12:38 pm-7:17 pm

1 stop28h 39m

$222

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 9/23

8:10 pm-11:43 am

1 stop17h 33m

Portland

Thu 10/1

12:38 pm-7:17 pm

1 stop28h 39m

$231

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 8/29

6:08 pm-8:20 pm

Nonstop4h 12m

Portland

Sat 9/5

12:20 pm-7:13 pm

1 stop28h 53m

$272

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 9/16

6:29 am-4:36 pm

2 stops12h 07m

Portland

Wed 9/23

11:16 am-5:10 pm

Nonstop3h 54m

$285

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
Quickest round-trip

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 8/29

8:30 am-10:40 am

Nonstop4h 10m

Portland

Sat 9/5

9:45 am-3:30 pm

Nonstop3h 45m

$297

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 8/29

8:30 am-10:40 am

Nonstop4h 10m

Portland

Sat 9/5

6:50 am-2:15 pm

1 stop5h 25m

$307

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 8/29

6:00 am-1:33 pm

1 stop9h 33m

Portland

Sat 9/5

12:20 pm-7:13 pm

1 stop28h 53m

$312

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 10/10

10:31 am-10:42 pm

2 stops14h 11m

Portland

Wed 10/14

5:30 am-5:44 pm

2 stops10h 14m

$313

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 11/13

6:40 am-5:04 pm

2 stops12h 24m

Portland

Sat 11/14

11:31 am-11:23 pm

2 stops9h 52m

$313

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Portland from

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

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 $222.

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 $303.

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 $394. 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 $263 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.

Can stopping save me money on St. Louis to Portland flights?

No. A direct flight is the cheapest option for a flight between St. Louis to Portland.

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

As of July 2026, prices for St. Louis to Portland flights are approximately 58% more expensive 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 $377.
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?

  • 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?

  • What is the most popular airline 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
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $167Free CancellationRating
5.6
2,747 reviews
Search Frontier flights
American AirlinesPriceFrom $186Free CancellationRating
7.1
11,846 reviews
Search American Airlines flights
DeltaPriceFrom $198Free CancellationRating
7.8
8,488 reviews
Search Delta flights
SouthwestPriceFrom $229Free CancellationRating
8.0
4,226 reviews
Search Southwest flights
United AirlinesPriceFrom $244Free CancellationRating
7.4
10,052 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $249Free CancellationRating
7.9
12,739 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 4 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 $398. Our users have rated Alaska Airlines at 7.9/10.

Traveling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Lincoln City
Seaside
Vancouver
Cannon Beach
Salem
Astoria
Long Beach
Beaverton
Rockaway Beach
Hillsboro
Depoe Bay
Tigard
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.
Start using Trips
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