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Cheap flights from Portland to St. Louis from $60

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 3/6. 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
12:04 pm - 9:49 am
PDX
-
STL
19h 45m
1 stop
Frontier Logo
6:19 pm - 9:13 am
STL
-
PDX
16h 54m
1 stop
$183Frontier
Fri, Mar 6 - Sun, Mar 8
Frontier Logo
1:48 pm - 7:12 pm
PDX
-
STL
27h 24m
1 stop
Frontier Logo
8:12 pm - 11:03 am
STL
-
PDX
16h 51m
1 stop
$222Frontier
Wed, Apr 15 - Sat, Apr 18
United Airlines Logo
12:57 pm - 10:14 pm
PDX
-
STL
7h 17m
1 stop
United Airlines Logo
9:55 am - 3:27 pm
STL
-
PDX
7h 32m
1 stop
$244United Airlines
Tue, Mar 3 - Wed, Mar 4
American Airlines Logo
11:40 pm - 8:54 am
PDX
-
STL
7h 14m
1 stop
American Airlines Logo
5:46 am - 2:24 pm
STL
-
PDX
10h 38m
1 stop
$246American Airlines
Thu, Apr 9 - Sat, Apr 11
Frontier Logo
12:04 pm - 9:49 am
PDX
-
STL
19h 45m
1 stop
Frontier Logo
7:52 am - 11:09 am
STL
-
PDX
29h 17m
2 stops
$248Frontier
Fri, Mar 6 - Sun, Mar 8
United Airlines Logo
7:30 am - 4:27 pm
PDX
-
STL
6h 57m
1 stop
United Airlines Logo
6:25 am - 11:55 am
STL
-
PDX
7h 30m
1 stop
$249United Airlines
Sat, Feb 28 - Tue, Mar 3
Frontier Logo
12:04 pm - 9:49 am
PDX
-
STL
19h 45m
1 stop
Frontier Logo
8:06 pm - 11:09 am
STL
-
PDX
17h 03m
2 stops
$251Frontier
Fri, Mar 13 - Sun, Mar 15
United Airlines Logo
12:57 pm - 10:14 pm
PDX
-
STL
7h 17m
1 stop
United Airlines Logo
5:15 am - 12:33 pm
STL
-
PDX
9h 18m
2 stops
$254United Airlines
Tue, Mar 3 - Tue, Mar 10
Frontier Logo
1:48 pm - 7:12 pm
PDX
-
STL
27h 24m
1 stop
Frontier Logo
8:12 pm - 11:42 am
STL
-
PDX
17h 30m
1 stop
$256Frontier
Wed, May 6 - Fri, May 8
Alaska Airlines Logo
11:18 am - 5:06 pm
PDX
-
STL
3h 48mnonstop
Alaska Airlines Logo
7:56 pm - 12:11 am
STL
-
PDX
6h 15m
1 stop
$259Alaska Airlines
Thu, May 21 - Wed, May 27

Delta flights from Portland to St. Louis

Our best Delta deals on Portland to St. Louis flight tickets
Delta
Mar 18
PDX5:02 pmPortland
5h 19m
1 stop
STL12:21 amLambert-St Louis
Mar 25
STL3:05 pmLambert-St Louis
7h 20m
1 stop
PDX8:25 pmPortland
$273
Delta
Apr 1
PDX9:15 amPortland
13h 06m
2 stops
STL12:21 amLambert-St Louis
Apr 6
STL6:12 pmLambert-St Louis
7h 42m
1 stop
PDX11:54 pmPortland
$281
Delta
Mar 4
PDX7:35 pmPortland
11h 57m
2 stops
STL9:32 amLambert-St Louis
Mar 9
STL1:39 pmLambert-St Louis
10h 14m
1 stop
PDX9:53 pmPortland
$301

United Airlines flights from Portland to St. Louis

Our best United Airlines deals on Portland to St. Louis flight tickets
United Airlines
Mar 3
PDX12:57 pmPortland
7h 17m
1 stop
STL10:14 pmLambert-St Louis
Mar 4
STL9:55 amLambert-St Louis
7h 32m
1 stop
PDX3:27 pmPortland
$244
United Airlines
Feb 28
PDX7:30 amPortland
6h 57m
1 stop
STL4:27 pmLambert-St Louis
Mar 3
STL6:25 amLambert-St Louis
7h 30m
1 stop
PDX11:55 amPortland
$249
United Airlines
Mar 3
PDX12:57 pmPortland
7h 17m
1 stop
STL10:14 pmLambert-St Louis
Mar 10
STL5:15 amLambert-St Louis
9h 18m
2 stops
PDX12:33 pmPortland
$254

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 February 3, 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

Fri 3/6

12:04 pm-9:49 am

1 stop19h 45m

Lambert-St Louis

Sun 3/8

6:19 pm-9:13 am

1 stop16h 54m

$183

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 4/15

1:48 pm-7:12 pm

1 stop27h 24m

Lambert-St Louis

Sat 4/18

8:12 pm-11:03 am

1 stop16h 51m

$222

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 3/3

12:57 pm-10:14 pm

1 stop7h 17m

Lambert-St Louis

Wed 3/4

9:55 am-3:27 pm

1 stop7h 32m

$244

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 4/9

11:40 pm-8:54 am

1 stop7h 14m

Lambert-St Louis

Sat 4/11

5:46 am-2:24 pm

1 stop10h 38m

$246

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 3/6

12:04 pm-9:49 am

1 stop19h 45m

Lambert-St Louis

Sun 3/8

7:52 am-11:09 am

2 stops29h 17m

$248

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sat 2/28

7:30 am-4:27 pm

1 stop6h 57m

Lambert-St Louis

Tue 3/3

6:25 am-11:55 am

1 stop7h 30m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 3/13

12:04 pm-9:49 am

1 stop19h 45m

Lambert-St Louis

Sun 3/15

8:06 pm-11:09 am

2 stops17h 03m

$251

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 3/3

12:57 pm-10:14 pm

1 stop7h 17m

Lambert-St Louis

Tue 3/10

5:15 am-12:33 pm

2 stops9h 18m

$254

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 5/6

1:48 pm-7:12 pm

1 stop27h 24m

Lambert-St Louis

Fri 5/8

8:12 pm-11:42 am

1 stop17h 30m

$256

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 5/21

11:18 am-5:06 pm

Nonstop3h 48m

Lambert-St Louis

Wed 5/27

7:56 pm-12:11 am

1 stop6h 15m

$259

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 Thursday when prices can be found for as low as $369. 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 $505 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 $366 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 $260 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.

Can stopping save me money on Portland to St. Louis flights?

You could potentially save up to 2% on your flight if you consider stops on a Portland to St. Louis flight.

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

As of February 2026, prices for Portland to St. Louis flights are approximately 42% 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

$242

Fastest flight time

3h 40m

Direct flights

Mon, Tue, Thu, Fri 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 $242
The fastest flight from Portland to St. Louis takes 3h 40m
Direct flights go from Portland to St. Louis on Monday, Tuesday, Thursday, Friday 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 3h 40m.

  • 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 $139Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
DeltaPriceFrom $189Free CancellationRating
7.9
8,138 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,218 reviews
Search American Airlines flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $242Free CancellationRating
8.0
11,834 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $248Free CancellationRating
8.0
4,272 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
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
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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