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Cheap flights from Portland to St. Louis from $85

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.
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0 bags

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Find the cheapest flights from Portland to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
5:50 am - 1:48 pm
PDX
-
STL
5h 58m1 stop
Delta Logo
11:23 am - 5:35 pm
STL
-
PDX
8h 12m1 stop
$177Delta
Wed, Jan 28 - Tue, Feb 3
American Airlines Logo
11:59 pm - 10:03 am
PDX
-
STL
8h 04m1 stop
American Airlines Logo
6:00 am - 10:48 am
STL
-
PDX
6h 48m1 stop
$189American Airlines
Tue, Mar 24 - Tue, Mar 31
Alaska Airlines Logo
9:30 pm - 1:54 pm
PDX
-
STL
14h 24m1 stop
Alaska Airlines Logo
2:50 pm - 8:47 pm
STL
-
PDX
7h 57m1 stop
$204Alaska Airlines
Mon, Jan 26 - Fri, Jan 30
Delta Logo
12:40 am - 10:43 am
PDX
-
STL
8h 03m1 stop
Delta Logo
3:31 pm - 8:32 pm
STL
-
PDX
7h 01m1 stop
$209Delta
Wed, Feb 4 - Tue, Feb 10
Delta Logo
1:45 pm - 12:21 am
PDX
-
STL
8h 36m1 stop
Delta Logo
6:12 pm - 11:54 pm
STL
-
PDX
7h 42m1 stop
$213Delta
Wed, Mar 11 - Mon, Mar 16
Delta Logo
12:40 am - 10:43 am
PDX
-
STL
8h 03m1 stop
Delta Logo
6:10 am - 12:46 pm
STL
-
PDX
8h 36m1 stop
$219Delta
Fri, Feb 6 - Wed, Feb 11
Multiple Airlines Logo
6:58 pm - 7:52 pm
PDX
-
STL
22h 54m1 stop
Multiple Airlines Logo
10:11 pm - 6:43 pm
STL
-
PDX
22h 32m1 stop
$228Multiple Airlines
Sun, Feb 15 - Thu, Feb 19
Alaska Airlines Logo
11:18 am - 5:06 pm
PDX
-
STL
3h 48mnonstop
Alaska Airlines Logo
6:20 pm - 8:37 pm
STL
-
PDX
4h 17mnonstop
$229Alaska Airlines
Thu, May 21 - Wed, May 27
Alaska Airlines Logo
2:42 pm - 11:59 pm
PDX
-
STL
7h 17m1 stop
Alaska Airlines Logo
4:20 pm - 9:38 pm
STL
-
PDX
7h 18m1 stop
$230Alaska Airlines
Thu, Apr 16 - Sat, Apr 18
United Airlines Logo
1:24 pm - 8:58 pm
PDX
-
STL
5h 34m1 stop
United Airlines Logo
8:05 am - 6:10 pm
STL
-
PDX
12h 05m2 stops
$234United Airlines
Wed, Jan 28 - Tue, Feb 3

Alaska Airlines flights from Portland to St. Louis

Our best Alaska Airlines deals on Portland to St. Louis flight tickets
Alaska Airlines
Jan 26
PDX9:30 pmPortland
14h 24m
1 stop
STL1:54 pmLambert-St Louis
Jan 30
STL2:50 pmLambert-St Louis
7h 57m
1 stop
PDX8:47 pmPortland
$204
Find similar
Alaska Airlines
May 21
PDX11:18 amPortland
3h 48m
STL5:06 pmLambert-St Louis
May 27
STL6:20 pmLambert-St Louis
4h 17m
PDX8:37 pmPortland
$229
Find similar
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
Find similar

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
Find similar
American Airlines
Apr 16
PDX11:40 pmPortland
7h 17m
1 stop
STL8:57 amLambert-St Louis
Apr 18
STL8:00 amLambert-St Louis
7h 22m
1 stop
PDX1:22 pmPortland
$274
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 January 7, 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

Wed 1/28

5:50 am-1:48 pm

1 stop5h 58m

Lambert-St Louis

Tue 2/3

11:23 am-5:35 pm

1 stop8h 12m

$177

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 3/24

11:59 pm-10:03 am

1 stop8h 04m

Lambert-St Louis

Tue 3/31

6:00 am-10:48 am

1 stop6h 48m

$189

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 1/26

9:30 pm-1:54 pm

1 stop14h 24m

Lambert-St Louis

Fri 1/30

2:50 pm-8:47 pm

1 stop7h 57m

$204

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 2/4

12:40 am-10:43 am

1 stop8h 03m

Lambert-St Louis

Tue 2/10

3:31 pm-8:32 pm

1 stop7h 01m

$209

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 3/11

1:45 pm-12:21 am

1 stop8h 36m

Lambert-St Louis

Mon 3/16

6:12 pm-11:54 pm

1 stop7h 42m

$213

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 2/6

12:40 am-10:43 am

1 stop8h 03m

Lambert-St Louis

Wed 2/11

6:10 am-12:46 pm

1 stop8h 36m

$219

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sun 2/15

6:58 pm-7:52 pm

1 stop22h 54m

Lambert-St Louis

Thu 2/19

10:11 pm-6:43 pm

1 stop22h 32m

$228

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 5/21

11:18 am-5:06 pm

Nonstop3h 48m

Lambert-St Louis

Wed 5/27

6:20 pm-8:37 pm

Nonstop4h 17m

$229

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 4/16

2:42 pm-11:59 pm

1 stop7h 17m

Lambert-St Louis

Sat 4/18

4:20 pm-9:38 pm

1 stop7h 18m

$230

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 1/28

1:24 pm-8:58 pm

1 stop5h 34m

Lambert-St Louis

Tue 2/3

8:05 am-6:10 pm

2 stops12h 05m

$234

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, 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

Every day

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 every day.
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
3,063 reviews
Search Frontier flights
DeltaPriceFrom $221Free CancellationRating
7.9
8,021 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,088 reviews
Search American Airlines flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,138 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $242Free CancellationRating
8.0
11,657 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,249 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

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