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Cheap flights from St. Louis to Portland from $62

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 1/10. 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
0 bags

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Find the cheapest flights from St. Louis to Portland

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:43 pm - 11:04 am
STL
-
PDX
21h 21m1 stop
Frontier Logo
6:19 pm - 12:40 pm
PDX
-
STL
16h 21m1 stop
$235Frontier
Wed, Jan 14 - Thu, Jan 15
Alaska Airlines Logo
6:20 pm - 8:30 pm
STL
-
PDX
4h 10mnonstop
Alaska Airlines Logo
9:45 pm - 2:07 pm
PDX
-
STL
14h 22m1 stop
$239Alaska Airlines
Wed, May 13 - Mon, May 18
Delta Logo
7:00 am - 12:32 pm
STL
-
PDX
7h 32m1 stop
Delta Logo
1:53 pm - 11:25 pm
PDX
-
STL
7h 32m1 stop
$249Delta
Thu, Jan 8 - Sun, Jan 11
United Airlines Logo
2:45 pm - 11:06 pm
STL
-
PDX
10h 21m2 stops
United Airlines Logo
8:30 am - 4:55 pm
PDX
-
STL
6h 25m1 stop
$254United Airlines
Thu, Jan 22 - Wed, Jan 28
Delta Logo
6:35 am - 6:50 pm
STL
-
PDX
14h 15m2 stops
Delta Logo
11:10 am - 9:38 pm
PDX
-
STL
8h 28m2 stops
$256Delta
Thu, Jan 22 - Wed, Jan 28
Alaska Airlines Logo
6:20 pm - 8:30 pm
STL
-
PDX
4h 10mnonstop
Alaska Airlines Logo
9:30 am - 5:22 pm
PDX
-
STL
5h 52m1 stop
$259Alaska Airlines
Fri, May 15 - Tue, May 19
Alaska Airlines Logo
6:20 pm - 8:30 pm
STL
-
PDX
4h 10mnonstop
Alaska Airlines Logo
11:25 am - 5:13 pm
PDX
-
STL
3h 48mnonstop
$269Alaska Airlines
Sat, May 23 - Sat, May 30
Delta Logo
7:00 am - 12:32 pm
STL
-
PDX
7h 32m1 stop
Delta Logo
7:10 am - 9:35 pm
PDX
-
STL
12h 25m2 stops
$272Delta
Thu, Jan 8 - Mon, Jan 12
American Airlines Logo
3:37 pm - 11:32 pm
STL
-
PDX
9h 55m1 stop
American Airlines Logo
10:15 pm - 9:40 am
PDX
-
STL
9h 25m1 stop
$273American Airlines
Thu, Jan 15 - Mon, Jan 19
Alaska Airlines Logo
6:20 pm - 8:30 pm
STL
-
PDX
4h 10mnonstop
Alaska Airlines Logo
9:30 am - 5:22 pm
PDX
-
STL
5h 52m1 stop
$279Alaska Airlines
Wed, May 13 - Mon, May 18

American Airlines flights from St. Louis to Portland

Our best American Airlines deals on St. Louis to Portland flight tickets
American Airlines
Jan 15
STL3:37 pmLambert-St Louis
9h 55m
1 stop
PDX11:32 pmPortland
Jan 19
PDX11:59 pmPortland
9h 04m
1 stop
STL11:03 amLambert-St Louis
$273
Find similar
American Airlines
May 20
STL6:05 amLambert-St Louis
8h 07m
1 stop
PDX12:12 pmPortland
Jun 3
PDX11:59 pmPortland
6h 53m
1 stop
STL8:52 amLambert-St Louis
$333
Find similar
American Airlines
Apr 22
STL6:05 amLambert-St Louis
8h 07m
1 stop
PDX12:12 pmPortland
Apr 26
PDX10:38 pmPortland
7h 27m
1 stop
STL8:05 amLambert-St Louis
$391
Find similar

Alaska Airlines flights from St. Louis to Portland

Our best Alaska Airlines deals on St. Louis to Portland flight tickets
Alaska Airlines
May 13
STL6:20 pmLambert-St Louis
4h 10m
PDX8:30 pmPortland
May 18
PDX9:45 pmPortland
14h 22m
1 stop
STL2:07 pmLambert-St Louis
$239
Find similar
Alaska Airlines
May 15
STL6:20 pmLambert-St Louis
4h 10m
PDX8:30 pmPortland
May 19
PDX9:30 amPortland
5h 52m
1 stop
STL5:22 pmLambert-St Louis
$259
Find similar
Alaska Airlines
May 23
STL6:20 pmLambert-St Louis
4h 10m
PDX8:30 pmPortland
May 30
PDX11:25 amPortland
3h 48m
STL5:13 pmLambert-St Louis
$269
Find similar

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 December 9, 2025.
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

Wed 1/14

3:43 pm-11:04 am

1 stop21h 21m

Portland

Thu 1/15

6:19 pm-12:40 pm

1 stop16h 21m

$235

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/13

6:20 pm-8:30 pm

Nonstop4h 10m

Portland

Mon 5/18

9:45 pm-2:07 pm

1 stop14h 22m

$239

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 1/8

7:00 am-12:32 pm

1 stop7h 32m

Portland

Sun 1/11

1:53 pm-11:25 pm

1 stop7h 32m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 1/22

2:45 pm-11:06 pm

2 stops10h 21m

Portland

Wed 1/28

8:30 am-4:55 pm

1 stop6h 25m

$254

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 1/22

6:35 am-6:50 pm

2 stops14h 15m

Portland

Wed 1/28

11:10 am-9:38 pm

2 stops8h 28m

$256

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 5/15

6:20 pm-8:30 pm

Nonstop4h 10m

Portland

Tue 5/19

9:30 am-5:22 pm

1 stop5h 52m

$259

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 5/23

6:20 pm-8:30 pm

Nonstop4h 10m

Portland

Sat 5/30

11:25 am-5:13 pm

Nonstop3h 48m

$269

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 1/8

7:00 am-12:32 pm

1 stop7h 32m

Portland

Mon 1/12

7:10 am-9:35 pm

2 stops12h 25m

$272

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 1/15

3:37 pm-11:32 pm

1 stop9h 55m

Portland

Mon 1/19

10:15 pm-9:40 am

1 stop9h 25m

$273

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/13

6:20 pm-8:30 pm

Nonstop4h 10m

Portland

Mon 5/18

9:30 am-5:22 pm

1 stop5h 52m

$279

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 cheapest month to fly to Portland?

The cheapest month to fly to Portland from St. Louis is in September. Flight prices, which tend to average around $303, are often lower during this time because this is during the off-season. If you don’t want to visit Portland in September, then you should wait until January to fly from St. Louis, when ticket prices are also cheap, with an average price of $305.

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 Monday when prices can be found for as low as $396. 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 $585.

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

The cheapest time of day to fly to Portland is in the morning when flights can be purchased for as low as $394. At noon is when there is more demand to fly to Portland, so prices are often more expensive at around $562 per ticket.

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 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 $357 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 $290 on momondo.

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

There is only 1 cabin class available to choose from on Lambert-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 December 2025, prices for St. Louis to Portland flights are approximately 5% 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

$337

Fastest flight time

4h 10m

Direct flights

Tue, Wed, Thu, Fri, Sat and Sun

Airports in Portland

1 airport
The best flight deal from St. Louis to Portland found on momondo in the last 72 hours is $337
The fastest flight from St. Louis to Portland takes 4h 10m
Direct flights go from St. Louis to Portland on Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport near Portland: Portland (PDX)
Search flight deals

  • 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 $137Free CancellationRating
5.8
3,085 reviews
Search Frontier flights
American AirlinesPriceFrom $188Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
DeltaPriceFrom $223Free CancellationRating
7.9
8,009 reviews
Search Delta flights
SouthwestPriceFrom $226Free CancellationRating
7.9
4,252 reviews
Search Southwest flights
United AirlinesPriceFrom $231Free CancellationRating
7.4
9,090 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $248Free CancellationRating
8.0
11,423 reviews
Search Alaska Airlines flights
Hawaiian AirlinesPriceFrom $338Free CancellationRating
7.8
2,818 reviews
Search Hawaiian Airlines flights

Traveling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Lincoln City
Seaside
Cannon Beach
Vancouver
Salem
Astoria
Long Beach
Depoe Bay
Rockaway Beach
Beaverton
Hillsboro
Hood River
McMinnville
Gresham
Longview
Tigard
The Dalles
Pacific City
Manzanita
Tillamook

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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