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Cheap flights from Portland to St. Louis from $61

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 11/18. 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.
United Airlines Logo
12:55 pm - 9:58 pmPDX-STL
7h 03m1 stop
United Airlines Logo
1:35 pm - 6:06 pmSTL-PDX
6h 31m1 stop
$249United Airlines
Find Deal
mié., dic. 3 - mié., dic. 10
United Airlines Logo
5:00 am - 3:40 pmPDX-STL
8h 40m2 stops
United Airlines Logo
5:30 pm - 10:52 pmSTL-PDX
7h 22m1 stop
$254United Airlines
Find Deal
sáb., dic. 6 - dom., dic. 7
Delta Logo
1:30 pm - 11:25 pmPDX-STL
7h 55m2 stops
Delta Logo
6:35 am - 6:50 pmSTL-PDX
14h 15m2 stops
$256Delta
Find Deal
sáb., ene. 31 - mié., feb. 4
Delta Logo
2:23 pm - 1:01 amPDX-STL
8h 38m2 stops
Delta Logo
6:15 am - 3:33 pmSTL-PDX
11h 18m2 stops
$257Delta
Find Deal
mié., dic. 3 - mié., dic. 10
Delta Logo
7:30 pm - 9:10 amPDX-STL
11h 40m2 stops
Delta Logo
6:00 am - 12:54 pmSTL-PDX
8h 54m1 stop
$262Delta
Find Deal
lun., dic. 8 - jue., dic. 11
Alaska Airlines Logo
1:45 pm - 11:56 pmPDX-STL
8h 11m1 stop
Alaska Airlines Logo
7:00 am - 12:36 pmSTL-PDX
7h 36m1 stop
$330Alaska Airlines
Find Deal
mié., feb. 25 - dom., mar. 1
Alaska Airlines Logo
6:00 am - 1:52 pmPDX-STL
5h 52m1 stop
Alaska Airlines Logo
2:55 pm - 7:08 pmSTL-PDX
6h 13m1 stop
$331Alaska Airlines
Find Deal
lun., mar. 9 - lun., mar. 9
Frontier Logo
3:26 pm - 9:07 amPDX-STL
15h 41m1 stop
Frontier Logo
9:07 pm - 11:56 amSTL-PDX
16h 49m2 stops
$333Frontier
Find Deal
dom., nov. 16 - lun., nov. 17
Frontier Logo
3:59 pm - 3:08 pmPDX-STL
21h 09m2 stops
Frontier Logo
9:54 pm - 1:08 pmSTL-PDX
17h 14m1 stop
$334Frontier
Find Deal
dom., nov. 23 - jue., nov. 27
Southwest Logo
6:35 am - 5:50 pmPDX-STL
9h 15m2 stops
Southwest Logo
2:20 pm - 10:05 pmSTL-PDX
9h 45m2 stops
$396Southwest
Find Deal
mar., feb. 17 - mar., feb. 24

United Airlines flights from Portland to St. Louis

Our best United Airlines deals on Portland to St. Louis flight tickets
United Airlines
Dec 3
PDX12:55 pmPortland
7h 03m
1 stop
STL9:58 pmLambert-St Louis
Dec 10
STL1:35 pmLambert-St Louis
6h 31m
1 stop
PDX6:06 pmPortland
$249
Find similar
United Airlines
Dec 6
PDX5:00 amPortland
8h 40m
2 stops
STL3:40 pmLambert-St Louis
Dec 7
STL5:30 pmLambert-St Louis
7h 22m
1 stop
PDX10:52 pmPortland
$254
Find similar
United Airlines
Feb 17
PDX12:57 pmPortland
7h 17m
1 stop
STL10:14 pmLambert-St Louis
Feb 24
STL9:55 amLambert-St Louis
9h 56m
2 stops
PDX5:51 pmPortland
$274
Find similar

Delta flights from Portland to St. Louis

Our best Delta deals on Portland to St. Louis flight tickets
Delta
Jan 31
PDX1:30 pmPortland
7h 55m
2 stops
STL11:25 pmLambert-St Louis
Feb 4
STL6:35 amLambert-St Louis
14h 15m
2 stops
PDX6:50 pmPortland
$256
Find similar
Delta
Dec 3
PDX2:23 pmPortland
8h 38m
2 stops
STL1:01 amLambert-St Louis
Dec 10
STL6:15 amLambert-St Louis
11h 18m
2 stops
PDX3:33 pmPortland
$257
Find similar
Delta
Dec 8
PDX7:30 pmPortland
11h 40m
2 stops
STL9:10 amLambert-St Louis
Dec 11
STL6:00 amLambert-St Louis
8h 54m
1 stop
PDX12:54 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 noviembre 6, 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. 12/3

12:55 pm-9:58 pm

1 stop7h 03m

Lambert-St Louis

mié. 12/10

1:35 pm-6:06 pm

1 stop6h 31m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

sáb. 12/6

5:00 am-3:40 pm

2 stops8h 40m

Lambert-St Louis

dom. 12/7

5:30 pm-10:52 pm

1 stop7h 22m

$254

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

sáb. 1/31

1:30 pm-11:25 pm

2 stops7h 55m

Lambert-St Louis

mié. 2/4

6:35 am-6:50 pm

2 stops14h 15m

$256

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

mié. 12/3

2:23 pm-1:01 am

2 stops8h 38m

Lambert-St Louis

mié. 12/10

6:15 am-3:33 pm

2 stops11h 18m

$257

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

lun. 12/8

7:30 pm-9:10 am

2 stops11h 40m

Lambert-St Louis

jue. 12/11

6:00 am-12:54 pm

1 stop8h 54m

$262

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

mié. 2/25

1:45 pm-11:56 pm

1 stop8h 11m

Lambert-St Louis

dom. 3/1

7:00 am-12:36 pm

1 stop7h 36m

$330

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

lun. 3/9

6:00 am-1:52 pm

1 stop5h 52m

Lambert-St Louis

lun. 3/9

2:55 pm-7:08 pm

1 stop6h 13m

$331

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

dom. 11/16

3:26 pm-9:07 am

1 stop15h 41m

Lambert-St Louis

lun. 11/17

9:07 pm-11:56 am

2 stops16h 49m

$333

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

dom. 11/23

3:59 pm-3:08 pm

2 stops21h 09m

Lambert-St Louis

jue. 11/27

9:54 pm-1:08 pm

1 stop17h 14m

$334

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

mar. 2/17

6:35 am-5:50 pm

2 stops9h 15m

Lambert-St Louis

mar. 2/24

2:20 pm-10:05 pm

2 stops9h 45m

$396

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 $273. 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 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 $378 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 November 2025, prices for Portland to St. Louis flights are approximately 42% cheaper 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

Direct flights

None
There are no direct flights from Portland to St. Louis. There are no popular flight routes from Portland to St. Louis.
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 52m.

  • 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 $124Free CancellationRating
5.8
3,116 reviews
Search Frontier flights
DeltaPriceFrom $221Free CancellationRating
7.9
8,001 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,003 reviews
Search United Airlines flights
SouthwestPriceFrom $247Free CancellationRating
8.0
4,240 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $262Free CancellationRating
8.0
11,241 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
Florissant
Maryland Heights
O'Fallon
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
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.

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