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Cheap flights from St. Louis to Portland from $69

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 4/27. 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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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
8:17 pm - 10:20 am
STL
-
PDX
16h 03m
1 stop
Frontier Logo
12:27 pm - 7:21 pm
PDX
-
STL
28h 54m
1 stop
$137Frontier
Sat, Apr 18 - Sat, Apr 25
Frontier Logo
8:17 pm - 10:20 am
STL
-
PDX
16h 03m
1 stop
Frontier Logo
12:27 pm - 7:21 pm
PDX
-
STL
28h 54m
1 stop
$139Frontier
Sat, Apr 18 - Sat, Apr 25
Frontier Logo
8:17 pm - 10:20 am
STL
-
PDX
16h 03m
1 stop
Frontier Logo
12:27 pm - 6:50 am
PDX
-
STL
40h 23m
2 stops
$180Frontier
Sat, Apr 18 - Sat, Apr 25
Delta Logo
6:45 pm - 11:53 pm
STL
-
PDX
7h 08m
1 stop
Delta Logo
5:05 pm - 12:25 am
PDX
-
STL
5h 20m
1 stop
$181Delta
Tue, Apr 14 - Tue, Apr 21
Southwest Logo
3:55 pm - 10:00 pm
STL
-
PDX
8h 05m
1 stop
Southwest Logo
11:55 pm - 9:30 am
PDX
-
STL
7h 35m
1 stop
$182Southwest
Wed, May 13 - Mon, May 18
Delta Logo
7:59 pm - 11:44 pm
STL
-
PDX
5h 45m
1 stop
Delta Logo
3:10 pm - 11:21 pm
PDX
-
STL
6h 11m
1 stop
$188Delta
Wed, May 13 - Mon, May 18
Delta Logo
1:39 pm - 9:53 pm
STL
-
PDX
10h 14m
1 stop
Delta Logo
5:45 am - 1:17 pm
PDX
-
STL
5h 32m
1 stop
$189Delta
Wed, Apr 1 - Wed, Apr 8
Delta Logo
6:20 am - 12:49 pm
STL
-
PDX
8h 29m
1 stop
Delta Logo
12:30 am - 8:46 am
PDX
-
STL
6h 16m
1 stop
$190Delta
Tue, Apr 28 - Wed, Apr 29
Southwest Logo
3:55 pm - 10:00 pm
STL
-
PDX
8h 05m
1 stop
Southwest Logo
11:55 pm - 9:30 am
PDX
-
STL
7h 35m
1 stop
$196Southwest
Wed, May 13 - Mon, May 18
Delta Logo
3:05 pm - 8:25 pm
STL
-
PDX
7h 20m
1 stop
Delta Logo
1:45 pm - 12:21 am
PDX
-
STL
8h 36m
1 stop
$197Delta
Tue, Mar 24 - Tue, Mar 31

United Airlines flights from St. Louis to Portland

Our best United Airlines deals on St. Louis to Portland flight tickets
United Airlines
Mar 24
STL5:15 amLambert-St Louis
9h 18m
2 stops
PDX12:33 pmPortland
Apr 6
PDX10:56 pmPortland
7h 29m
1 stop
STL8:25 amLambert-St Louis
$242
United Airlines
May 7
STL5:59 pmLambert-St Louis
6h 55m
1 stop
PDX10:54 pmPortland
May 14
PDX7:45 pmPortland
8h 02m
1 stop
STL5:47 amLambert-St Louis
$243
United Airlines
Apr 1
STL6:05 pmLambert-St Louis
6h 49m
1 stop
PDX10:54 pmPortland
Apr 6
PDX7:14 pmPortland
8h 36m
1 stop
STL5:50 amLambert-St Louis
$265

Alaska Airlines flights from St. Louis to Portland

Our best Alaska Airlines deals on St. Louis to Portland flight tickets
Alaska Airlines
May 13
STL5:33 pmLambert-St Louis
4h 17m
PDX7:50 pmPortland
May 18
PDX10:37 amPortland
4h 00m
STL4:37 pmLambert-St Louis
$213
Alaska Airlines
May 16
STL5:33 pmLambert-St Louis
4h 17m
PDX7:50 pmPortland
May 23
PDX5:00 amPortland
8h 16m
1 stop
STL3:16 pmLambert-St Louis
$223
Alaska Airlines
May 27
STL5:33 pmLambert-St Louis
4h 17m
PDX7:50 pmPortland
Jun 1
PDX10:37 amPortland
4h 00m
STL4:37 pmLambert-St Louis
$229

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 February 27, 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

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 4/18

8:17 pm-10:20 am

1 stop16h 03m

Portland

Sat 4/25

12:27 pm-7:21 pm

1 stop28h 54m

$137

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 4/18

8:17 pm-10:20 am

1 stop16h 03m

Portland

Sat 4/25

12:27 pm-7:21 pm

1 stop28h 54m

$139

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 4/18

8:17 pm-10:20 am

1 stop16h 03m

Portland

Sat 4/25

12:27 pm-6:50 am

2 stops40h 23m

$180

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 4/14

6:45 pm-11:53 pm

1 stop7h 08m

Portland

Tue 4/21

5:05 pm-12:25 am

1 stop5h 20m

$181

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/13

3:55 pm-10:00 pm

1 stop8h 05m

Portland

Mon 5/18

11:55 pm-9:30 am

1 stop7h 35m

$182

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/13

7:59 pm-11:44 pm

1 stop5h 45m

Portland

Mon 5/18

3:10 pm-11:21 pm

1 stop6h 11m

$188

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 4/1

1:39 pm-9:53 pm

1 stop10h 14m

Portland

Wed 4/8

5:45 am-1:17 pm

1 stop5h 32m

$189

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 4/28

6:20 am-12:49 pm

1 stop8h 29m

Portland

Wed 4/29

12:30 am-8:46 am

1 stop6h 16m

$190

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/13

3:55 pm-10:00 pm

1 stop8h 05m

Portland

Mon 5/18

11:55 pm-9:30 am

1 stop7h 35m

$196

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 3/24

3:05 pm-8:25 pm

1 stop7h 20m

Portland

Tue 3/31

1:45 pm-12:21 am

1 stop8h 36m

$197

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 January. Flight prices, which tend to average around $291, 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 $278. 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 $530.

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 afternoon when flights can be purchased for as low as $379. At noon is when there is more demand to fly to Portland, so prices are often more expensive at around $556 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 $359 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 $282 on momondo.

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

There are 2 cabin classes 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 February 2026, prices for St. Louis to Portland flights are approximately 6% 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

$114

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 $114. The best round-trip flight deal from St. Louis to Portland found on momondo in the last 72 hours is $298.
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

  • 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 $141Free CancellationRating
5.7
3,041 reviews
Search Frontier flights
American AirlinesPriceFrom $188Free CancellationRating
7.2
11,357 reviews
Search American Airlines flights
SouthwestPriceFrom $204Free CancellationRating
8.0
4,301 reviews
Search Southwest flights
DeltaPriceFrom $204Free CancellationRating
7.9
8,242 reviews
Search Delta flights
United AirlinesPriceFrom $238Free CancellationRating
7.4
9,351 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $248Free CancellationRating
8.0
11,965 reviews
Search Alaska Airlines flights
Hawaiian AirlinesPriceFrom $338Free CancellationRating
7.8
2,837 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
Rockaway Beach
Depoe Bay
Beaverton
Hillsboro
Hood River
Tigard
Longview
McMinnville
The Dalles
Pacific City
Gresham
Newberg
Manzanita

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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