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Cheap flights from Portland to St. Louis from $75

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 10/28. 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 Portland to St. Louis

Cheap round-trip flights

Frontier Logo
12:43 pm - 9:07 amPDX-STL
18h 24m1 stop
Frontier Logo
4:51 pm - 8:23 amSTL-PDX
17h 32m2 stops
$246Frontier
Find Deal
mié., oct. 15 - sáb., oct. 18
Alaska Airlines Logo
6:00 am - 3:18 pmPDX-STL
7h 18m1 stop
Alaska Airlines Logo
7:00 am - 12:38 pmSTL-PDX
7h 38m1 stop
$248Alaska Airlines
Find Deal
sáb., nov. 8 - sáb., nov. 15
American Airlines Logo
11:58 pm - 8:09 amPDX-STL
6h 11m1 stop
American Airlines Logo
5:11 am - 10:56 amSTL-PDX
7h 45m1 stop
$249American Airlines
Find Deal
jue., oct. 23 - lun., oct. 27
Frontier Logo
2:15 pm - 10:02 amPDX-STL
41h 47m2 stops
Frontier Logo
7:43 pm - 11:57 amSTL-PDX
18h 14m1 stop
$251Frontier
Find Deal
sáb., dic. 6 - sáb., dic. 13
Southwest Logo
7:15 am - 7:25 pmPDX-STL
10h 10m2 stops
Southwest Logo
5:45 pm - 12:20 amSTL-PDX
8h 35m1 stop
$254Southwest
Find Deal
mié., nov. 5 - jue., nov. 6
Frontier Logo
12:52 pm - 1:17 pmPDX-STL
22h 25m2 stops
Frontier Logo
7:45 pm - 9:18 amSTL-PDX
15h 33m2 stops
$256Frontier
Find Deal
jue., oct. 30 - dom., nov. 2
Logo
6:05 am - 9:06 amPDX-STL
25h 01m1 stop
Logo
10:14 am - 5:16 pmSTL-PDX
9h 02m1 stop
$259
Find Deal
vie., oct. 3 - dom., oct. 5
Delta Logo
10:58 pm - 9:37 amPDX-STL
8h 39m1 stop
Delta Logo
6:00 am - 12:49 pmSTL-PDX
8h 49m2 stops
$261Delta
Find Deal
vie., oct. 24 - mar., oct. 28
Logo
6:05 am - 9:06 amPDX-STL
25h 01m1 stop
Logo
6:33 am - 12:25 pmSTL-PDX
7h 52m1 stop
$265
Find Deal
lun., sep. 29 - mié., oct. 8
Delta Logo
5:05 pm - 12:46 amPDX-STL
5h 41m1 stop
Delta Logo
12:49 pm - 5:43 pmSTL-PDX
6h 54m1 stop
$274Delta
Find Deal
vie., nov. 21 - dom., nov. 23

Frontier flights from Portland to St. Louis

Our best Frontier deals on Portland to St. Louis flight tickets
Frontier
Oct 15
PDX12:43 pmPortland
18h 24m
1 stop
STL9:07 amLambert-St Louis
Oct 18
STL4:51 pmLambert-St Louis
17h 32m
2 stops
PDX8:23 amPortland
$246
Find similar
Frontier
Dec 6
PDX2:15 pmPortland
41h 47m
2 stops
STL10:02 amLambert-St Louis
Dec 13
STL7:43 pmLambert-St Louis
18h 14m
1 stop
PDX11:57 amPortland
$251
Find similar
Frontier
Oct 30
PDX12:52 pmPortland
22h 25m
2 stops
STL1:17 pmLambert-St Louis
Nov 2
STL7:45 pmLambert-St Louis
15h 33m
2 stops
PDX9:18 amPortland
$256
Find similar

Alaska Airlines flights from Portland to St. Louis

Our best Alaska Airlines deals on Portland to St. Louis flight tickets
Alaska Airlines
Nov 8
PDX6:00 amPortland
7h 18m
1 stop
STL3:18 pmLambert-St Louis
Nov 15
STL7:00 amLambert-St Louis
7h 38m
1 stop
PDX12:38 pmPortland
$248
Find similar
Alaska Airlines
Oct 1
PDX6:05 amPortland
6h 34m
1 stop
STL2:39 pmLambert-St Louis
Oct 7
STL6:33 amLambert-St Louis
7h 52m
1 stop
PDX12:25 pmPortland
$297
Find similar
Alaska Airlines
Oct 7
PDX10:30 amPortland
11h 33m
2 stops
STL12:03 amLambert-St Louis
Dec 4
STL7:00 amLambert-St Louis
8h 55m
1 stop
PDX1:55 pmPortland
$299
Find similar

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 septiembre 15, 2025.
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

mié. 10/15

12:43 pm-9:07 am

1 stop18h 24m

Lambert-St Louis

sáb. 10/18

4:51 pm-8:23 am

2 stops17h 32m

$246

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

sáb. 11/8

6:00 am-3:18 pm

1 stop7h 18m

Lambert-St Louis

sáb. 11/15

7:00 am-12:38 pm

1 stop7h 38m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

jue. 10/23

11:58 pm-8:09 am

1 stop6h 11m

Lambert-St Louis

lun. 10/27

5:11 am-10:56 am

1 stop7h 45m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

sáb. 12/6

2:15 pm-10:02 am

2 stops41h 47m

Lambert-St Louis

sáb. 12/13

7:43 pm-11:57 am

1 stop18h 14m

$251

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

mié. 11/5

7:15 am-7:25 pm

2 stops10h 10m

Lambert-St Louis

jue. 11/6

5:45 pm-12:20 am

1 stop8h 35m

$254

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

jue. 10/30

12:52 pm-1:17 pm

2 stops22h 25m

Lambert-St Louis

dom. 11/2

7:45 pm-9:18 am

2 stops15h 33m

$256

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

vie. 10/3

6:05 am-9:06 am

1 stop25h 01m

Lambert-St Louis

dom. 10/5

10:14 am-5:16 pm

1 stop9h 02m

$259

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

vie. 10/24

10:58 pm-9:37 am

1 stop8h 39m

Lambert-St Louis

mar. 10/28

6:00 am-12:49 pm

2 stops8h 49m

$261

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

lun. 9/29

6:05 am-9:06 am

1 stop25h 01m

Lambert-St Louis

mié. 10/8

6:33 am-12:25 pm

1 stop7h 52m

$265

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

vie. 11/21

5:05 pm-12:46 am

1 stop5h 41m

Lambert-St Louis

dom. 11/23

12:49 pm-5:43 pm

1 stop6h 54m

$274

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 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 cheapest month to fly to St. Louis?

In general, January 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 $280. The month of September is another great option to travel to St. Louis, with average flight prices from Portland averaging around $318.

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 Tuesday when prices can be found for as low as $379. 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 Thursday because tickets tend to average around $771. 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 evening is the least expensive time of day to depart. momondo users have found prices as low as $288 when looking at flights departing in the evening. 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 $380 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 $245 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 September 2025, prices for Portland to St. Louis flights are approximately 56% 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

3h 45m

Direct flights

Mon and Sun

Airports in St. Louis

1 airport
The fastest flight from Portland to St. Louis takes 3h 45m
Direct flights go from Portland to St. Louis on Monday and Sunday. There are no airlines offering direct flights.
There is 1 airport near St. Louis: 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 41m.

  • 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 $118Free CancellationRating
5.8
3,172 reviews
Search Frontier flights
DeltaPriceFrom $204Free CancellationRating
7.9
7,954 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
SouthwestPriceFrom $247Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $262Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights

  • Southwest Flights From Portland to St. Louis

    Southwest is one of the most popular airlines flying from Portland to St. Louis, operating 2 flights/week on average for this route. A good Southwest flight deal for Portland to St. Louis starts from $247 round-trip, up to an average price of $426. Our users have rated Southwest at 8.0/10.

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
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
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.
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