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Cheap flights from Portland to St. Louis from $68

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 1/16. 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 Portland to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
11:28 am - 9:06 pm
PDX
-
STL
7h 38m1 stop
Frontier Logo
9:32 pm - 11:18 am
STL
-
PDX
15h 46m1 stop
$195Frontier
Thu, Jan 29 - Sun, Feb 1
Frontier Logo
11:28 am - 9:06 pm
PDX
-
STL
7h 38m1 stop
Frontier Logo
9:32 pm - 11:18 am
STL
-
PDX
15h 46m1 stop
$199Frontier
Thu, Jan 29 - Sun, Feb 1
Frontier Logo
11:29 am - 8:08 pm
PDX
-
STL
30h 39m2 stops
Frontier Logo
9:27 pm - 11:18 am
STL
-
PDX
15h 51m1 stop
$213Frontier
Sun, Jan 18 - Sun, Jan 25
Frontier Logo
10:18 pm - 5:46 pm
PDX
-
STL
17h 28m1 stop
Frontier Logo
10:11 pm - 6:21 pm
STL
-
PDX
22h 10m1 stop
$226Frontier
Fri, Feb 27 - Sun, Mar 1
Alaska Airlines Logo
11:18 am - 5:06 pm
PDX
-
STL
3h 48mnonstop
Alaska Airlines Logo
6:20 pm - 8:30 pm
STL
-
PDX
4h 10mnonstop
$229Alaska Airlines
Tue, May 26 - Wed, Jul 1
Delta Logo
1:30 pm - 11:25 pm
PDX
-
STL
7h 55m2 stops
Delta Logo
3:31 pm - 12:17 am
STL
-
PDX
10h 46m2 stops
$236Delta
Wed, Jan 21 - Mon, Jan 26
Frontier Logo
11:28 am - 9:06 pm
PDX
-
STL
7h 38m1 stop
Frontier Logo
9:32 pm - 8:27 pm
STL
-
PDX
24h 55m2 stops
$242Frontier
Thu, Jan 29 - Sun, Feb 1
Frontier Logo
11:28 am - 9:06 pm
PDX
-
STL
7h 38m1 stop
Frontier Logo
9:27 pm - 11:18 am
STL
-
PDX
15h 51m1 stop
$246Frontier
Thu, Jan 22 - Sun, Jan 25
United Airlines Logo
8:30 am - 4:55 pm
PDX
-
STL
6h 25m1 stop
United Airlines Logo
6:30 am - 11:57 am
STL
-
PDX
7h 27m1 stop
$249United Airlines
Thu, Jan 29 - Sun, Feb 1
United Airlines Logo
8:30 am - 4:58 pm
PDX
-
STL
6h 28m1 stop
United Airlines Logo
9:55 am - 5:51 pm
STL
-
PDX
9h 56m2 stops
$254United Airlines
Fri, Feb 20 - Tue, Feb 24

Frontier flights from Portland to St. Louis

Our best Frontier deals on Portland to St. Louis flight tickets
Frontier
Jan 29
PDX11:28 amPortland
7h 38m
1 stop
STL9:06 pmLambert-St Louis
Feb 1
STL9:32 pmLambert-St Louis
15h 46m
1 stop
PDX11:18 amPortland
$199
Find similar
Frontier
Jan 18
PDX11:29 amPortland
30h 39m
2 stops
STL8:08 pmLambert-St Louis
Jan 25
STL9:27 pmLambert-St Louis
15h 51m
1 stop
PDX11:18 amPortland
$213
Find similar
Frontier
Feb 27
PDX10:18 pmPortland
17h 28m
1 stop
STL5:46 pmLambert-St Louis
Mar 1
STL10:11 pmLambert-St Louis
22h 10m
1 stop
PDX6:21 pmPortland
$226
Find similar

Delta flights from Portland to St. Louis

Our best Delta deals on Portland to St. Louis flight tickets
Delta
Jan 21
PDX1:30 pmPortland
7h 55m
2 stops
STL11:25 pmLambert-St Louis
Jan 26
STL3:31 pmLambert-St Louis
10h 46m
2 stops
PDX12:17 amPortland
$236
Find similar
Delta
Mar 4
PDX11:35 amPortland
9h 48m
2 stops
STL11:23 pmLambert-St Louis
Mar 9
STL2:22 pmLambert-St Louis
8h 36m
2 stops
PDX8:58 pmPortland
$257
Find similar
Delta
Mar 4
PDX1:27 pmPortland
8h 58m
2 stops
STL12:25 amLambert-St Louis
Mar 9
STL6:12 pmLambert-St Louis
7h 42m
1 stop
PDX11:54 pmPortland
$262
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 December 23, 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

Thu 1/29

11:28 am-9:06 pm

1 stop7h 38m

Lambert-St Louis

Sun 2/1

9:32 pm-11:18 am

1 stop15h 46m

$195

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/29

11:28 am-9:06 pm

1 stop7h 38m

Lambert-St Louis

Sun 2/1

9:32 pm-11:18 am

1 stop15h 46m

$199

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sun 1/18

11:29 am-8:08 pm

2 stops30h 39m

Lambert-St Louis

Sun 1/25

9:27 pm-11:18 am

1 stop15h 51m

$213

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 2/27

10:18 pm-5:46 pm

1 stop17h 28m

Lambert-St Louis

Sun 3/1

10:11 pm-6:21 pm

1 stop22h 10m

$226

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 5/26

11:18 am-5:06 pm

Nonstop3h 48m

Lambert-St Louis

Wed 7/1

6:20 pm-8:30 pm

Nonstop4h 10m

$229

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 1/21

1:30 pm-11:25 pm

2 stops7h 55m

Lambert-St Louis

Mon 1/26

3:31 pm-12:17 am

2 stops10h 46m

$236

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/29

11:28 am-9:06 pm

1 stop7h 38m

Lambert-St Louis

Sun 2/1

9:32 pm-8:27 pm

2 stops24h 55m

$242

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/22

11:28 am-9:06 pm

1 stop7h 38m

Lambert-St Louis

Sun 1/25

9:27 pm-11:18 am

1 stop15h 51m

$246

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/29

8:30 am-4:55 pm

1 stop6h 25m

Lambert-St Louis

Sun 2/1

6:30 am-11:57 am

1 stop7h 27m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 2/20

8:30 am-4:58 pm

1 stop6h 28m

Lambert-St Louis

Tue 2/24

9:55 am-5:51 pm

2 stops9h 56m

$254

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 November is another great option to travel to St. Louis, with average flight prices from Portland averaging around $300.

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 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 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 $372 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 December 2025, prices for Portland to St. Louis flights are approximately 0% 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

Best Price Found

$249

Fastest flight time

5h 34m

Direct flights

Wed, Fri, Sat and Sun

Airports in St. Louis

1 airport
The best flight deal from Portland to St. Louis found on momondo in the last 72 hours is $249
The fastest flight from Portland to St. Louis takes 5h 34m
Direct flights go from Portland to St. Louis on Wednesday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
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 34m.

  • 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
5.8
3,075 reviews
Search Frontier flights
DeltaPriceFrom $217Free CancellationRating
7.9
8,014 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,054 reviews
Search American Airlines flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,105 reviews
Search United Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,253 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $262Free CancellationRating
8.0
11,510 reviews
Search Alaska Airlines 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
Maryland Heights
O'Fallon
Florissant
Fenton
St. Peters
Wentzville
Collinsville
Alton
Farmington
Clayton
Festus
Glencoe
Eureka
Edwardsville
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.

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