Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Portland to St. Louis from $74

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to St. Louis departing on 3/8. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Portland to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
12:04 pm - 9:49 am
PDX
-
STL
19h 45m1 stop
Frontier Logo
8:12 pm - 11:09 am
STL
-
PDX
16h 57m1 stop
$141Frontier
Sun, Mar 8 - Wed, Mar 11
Frontier Logo
12:52 pm - 7:11 pm
PDX
-
STL
28h 19m1 stop
Frontier Logo
8:12 pm - 11:09 am
STL
-
PDX
16h 57m1 stop
$151Frontier
Mon, Mar 9 - Wed, Mar 11
Frontier Logo
12:04 pm - 9:49 am
PDX
-
STL
19h 45m1 stop
Frontier Logo
8:12 pm - 11:09 am
STL
-
PDX
16h 57m1 stop
$156Frontier
Fri, Mar 6 - Wed, Mar 11
Frontier Logo
12:04 pm - 9:49 am
PDX
-
STL
19h 45m1 stop
Frontier Logo
9:22 pm - 8:58 am
STL
-
PDX
13h 36m1 stop
$166Frontier
Fri, Mar 6 - Sun, Mar 8
Frontier Logo
10:18 pm - 10:27 pm
PDX
-
STL
46h 09m2 stops
Frontier Logo
8:12 pm - 11:09 am
STL
-
PDX
16h 57m1 stop
$167Frontier
Mon, Mar 2 - Wed, Mar 11
Frontier Logo
12:04 pm - 9:49 am
PDX
-
STL
19h 45m1 stop
Frontier Logo
8:12 pm - 10:09 am
STL
-
PDX
15h 57m1 stop
$172Frontier
Fri, Mar 6 - Sat, Mar 7
Delta Logo
6:00 am - 2:54 pm
PDX
-
STL
6h 54m1 stop
Delta Logo
6:40 pm - 11:53 pm
STL
-
PDX
7h 13m1 stop
$177Delta
Wed, Mar 4 - Fri, Mar 6
Frontier Logo
12:04 pm - 9:49 am
PDX
-
STL
19h 45m1 stop
Frontier Logo
10:47 pm - 8:58 am
STL
-
PDX
12h 11m1 stop
$182Frontier
Sun, Mar 8 - Thu, Mar 12
Frontier Logo
12:04 pm - 9:49 am
PDX
-
STL
19h 45m1 stop
Frontier Logo
8:12 pm - 8:58 am
STL
-
PDX
14h 46m2 stops
$185Frontier
Sun, Mar 8 - Wed, Mar 11
Southwest Logo
5:05 am - 4:35 pm
PDX
-
STL
9h 30m2 stops
Southwest Logo
2:45 pm - 10:00 pm
STL
-
PDX
9h 15m2 stops
$188Southwest
Tue, Mar 3 - Tue, Mar 10

American Airlines flights from Portland to St. Louis

Our best American Airlines deals on Portland to St. Louis flight tickets
American Airlines
Mar 24
PDX11:59 pmPortland
8h 04m
1 stop
STL10:03 amLambert-St Louis
Mar 31
STL6:00 amLambert-St Louis
6h 48m
1 stop
PDX10:48 amPortland
$189
American Airlines
Jan 30
PDX2:50 pmPortland
7h 09m
1 stop
STL11:59 pmLambert-St Louis
Feb 2
STL3:37 pmLambert-St Louis
8h 34m
1 stop
PDX10:11 pmPortland
$213
American Airlines
Jan 29
PDX11:59 pmPortland
9h 06m
1 stop
STL11:05 amLambert-St Louis
Feb 2
STL2:38 pmLambert-St Louis
7h 13m
1 stop
PDX7:51 pmPortland
$229

Alaska Airlines flights from Portland to St. Louis

Our best Alaska Airlines deals on Portland to St. Louis flight tickets
Alaska Airlines
Apr 16
PDX6:00 amPortland
7h 24m
1 stop
STL3:24 pmLambert-St Louis
Apr 18
STL4:20 pmLambert-St Louis
9h 24m
1 stop
PDX11:44 pmPortland
$230
Alaska Airlines
Mar 17
PDX3:52 pmPortland
20h 59m
1 stop
STL2:51 pmLambert-St Louis
Mar 25
STL7:00 amLambert-St Louis
7h 35m
1 stop
PDX12:35 pmPortland
$241
Alaska Airlines
May 11
PDX5:30 pmPortland
20h 20m
1 stop
STL3:50 pmLambert-St Louis
May 15
STL6:20 pmLambert-St Louis
4h 17m
PDX8:37 pmPortland
$250

momondo Fare Finder

 
Customize your flight search to find flights from Portland to St. Louis 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 January 8, 2026.
Use the filters below to find and compare flights from Portland to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sun 3/8

12:04 pm-9:49 am

1 stop19h 45m

Lambert-St Louis

Wed 3/11

8:12 pm-11:09 am

1 stop16h 57m

$141

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 3/9

12:52 pm-7:11 pm

1 stop28h 19m

Lambert-St Louis

Wed 3/11

8:12 pm-11:09 am

1 stop16h 57m

$151

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 3/6

12:04 pm-9:49 am

1 stop19h 45m

Lambert-St Louis

Wed 3/11

8:12 pm-11:09 am

1 stop16h 57m

$156

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 3/6

12:04 pm-9:49 am

1 stop19h 45m

Lambert-St Louis

Sun 3/8

9:22 pm-8:58 am

1 stop13h 36m

$166

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 3/2

10:18 pm-10:27 pm

2 stops46h 09m

Lambert-St Louis

Wed 3/11

8:12 pm-11:09 am

1 stop16h 57m

$167

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 3/6

12:04 pm-9:49 am

1 stop19h 45m

Lambert-St Louis

Sat 3/7

8:12 pm-10:09 am

1 stop15h 57m

$172

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 3/4

6:00 am-2:54 pm

1 stop6h 54m

Lambert-St Louis

Fri 3/6

6:40 pm-11:53 pm

1 stop7h 13m

$177

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sun 3/8

12:04 pm-9:49 am

1 stop19h 45m

Lambert-St Louis

Thu 3/12

10:47 pm-8:58 am

1 stop12h 11m

$182

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sun 3/8

12:04 pm-9:49 am

1 stop19h 45m

Lambert-St Louis

Wed 3/11

8:12 pm-8:58 am

2 stops14h 46m

$185

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 3/3

5:05 am-4:35 pm

2 stops9h 30m

Lambert-St Louis

Tue 3/10

2:45 pm-10:00 pm

2 stops9h 15m

$188

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to St. Louis from

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

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 Portland and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, November is the cheapest month to fly from Portland to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $300. The month of September is another great option to travel to St. Louis, with average flight prices from Portland averaging around $317.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Saturday when prices can be found for as low as $548. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $621. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Portland in the morning is the least expensive time of day to depart. momondo users have found prices as low as $507 when looking at flights departing in the morning. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $679 per ticket.

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

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

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

You are more likely to see cheaper flights to St. Louis from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $370 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Portland for as low as $243 on momondo.

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

There is only 1 cabin class available to choose from on Portland to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

As of January 2026, prices for Portland to St. Louis flights are approximately 71% more expensive when compared to flights at the same time last year.

When to book flights from Portland to St. Louis

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

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

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

Fastest flight time

5h 25m

Direct flights

Mon, Tue, Thu, Fri, Sat and Sun

Airports in St. Louis

1 airport
The fastest flight from Portland to St. Louis takes 5h 25m
Direct flights go from Portland to St. Louis on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. The only airline offering direct flights is Alaska Airlines.
There is 1 airport in St. Louis. From Portland there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is Portland to Lambert-St Louis by plane?

    A flight from Portland to Lambert-St Louis will travel around 1718.1 mi. A reasonable flight in good conditions will take 5h 25m.

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

    Prices for flights from Portland Airport to Lambert-St Louis Airport are updated daily.

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

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

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Portland to St. Louis?

  • What is the most popular airline from Portland to St. Louis?

Best airlines flying from Portland to St. Louis

Compare and see reviews for airlines that fly from Portland to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $158Free CancellationRating
5.7
3,061 reviews
Search Frontier flights
DeltaPriceFrom $221Free CancellationRating
7.9
8,029 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,095 reviews
Search American Airlines flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,141 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $242Free CancellationRating
8.0
11,666 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,250 reviews
Search Southwest flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
O'Fallon
Maryland Heights
Florissant
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Festus
Edwardsville
Glencoe
Litchfield
Shrewsbury

Why use momondo?

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

It is quick and easy to find Portland to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

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

momondo does allow users to show only those flights to St. Louis from Portland which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search for Portland to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Of course. momondo tracks the price of Portland to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your St. Louis 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
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 2/7
Sat 2/14
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States