What are the cheapest airlines to fly from Oregon to St. Louis one-way?

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $80. However, be on the lookout for offers from Hawaiian Airlines and Delta, as they are both options that can get you from Oregon to St. Louis for a low price.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What are the most popular routes from Oregon to St. Louis?

While some choose either Boise Air Term. Gowen Fld - Lambert-St Louis or Bend/Redmond - Lambert-St Louis, Portland - Lambert-St Louis is the most popular route from Oregon to St. Louis.

What are the cheapest flights from Oregon to St. Louis?

On average you can expect to pay $490 for a flight from Oregon to St. Louis. The cheapest flight overall is $148 while the most popular route, (Portland - Lambert-St Louis) is currently priced at $201.

What are the most popular airlines that fly from Oregon to St. Louis?

The most popular airlines flying from Oregon to St. Louis are American Airlines, Alaska Airlines and Delta. Something to consider prior to booking your flight.

How far in advance should I book a flight from Oregon to St. Louis?

Travelers have found it’s best to book a flight 37 days in advance to save up to 86% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 37 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Oregon to St. Louis 1-2 weeks in advance for as low as $388, or $470 for flights within the next 24 hours.

What is the cheapest month to fly from Oregon to St. Louis?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, January can be a great choice for travel to St. Louis. Flights to St. Louis from Oregon in January are about $389 on average during January, but can be found for as low as $198.

What airport do you fly into for flights to St. Louis from Oregon?

Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to St. Louis from Oregon.

Can I find deals for flights from Oregon to St. Louis that include hotel bookings?

Yes. In addition to deals on Oregon to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Oregon to St. Louis?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Oregon to St. Louis.

Can I find deals for business class flights from Oregon to St. Louis?

Yes. Cheapflights offers flight deals from Oregon to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$80+ Cheap Flights from Oregon to St. Louis

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Cheap flight deals from Oregon to St. Louis

Round-trip from	$251 (American Airlines)
One-way from	$80 (Priceline)
Popular in	December
Cheapest in	January
Average price	$395
Good round-trip deal	$488 or less
Good one-way deal	$289 or less

From Oregon to Lambert-St Louis

Search Deals

One-way flight from Oregon to Lambert-St Louis

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Highest demand for flights based on searches. 4% potential increase in price ($19 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).

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Average for round-trip flights in August 2025

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Price to beat on a round-trip flight from Oregon to Lambert-St Louis.

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Price to beat on a one-way flight from Oregon to Lambert-St Louis.

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Find flight deals from Oregon to St. Louis

Cheapest flights from Oregon to St. Louis
Explore the most affordable flight options available from Oregon to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

Tue 9/91:38 pmBOI - STL

1 stop5h 37mAmerican Airlines

Tue 9/167:23 amSTL - BOI

1 stop6h 04mAmerican Airlines

Deal found 8/13

$251

Thu 10/2310:29 amPDX - STL

1 stop7h 57mAmerican Airlines

Mon 10/275:02 pmSTL - PDX

1 stop8h 06mAmerican Airlines

Deal found 8/14

$253

Thu 10/2312:40 amPDX - STL

1 stop6h 11mDelta

Mon 10/275:31 pmSTL - PDX

2 stops17h 05mDelta

Deal found 8/14

$257

Tue 11/115:00 amPDX - STL

2 stops10h 20mSouthwest

Fri 11/146:35 pmSTL - PDX

1 stop6h 35mSouthwest

Deal found 8/12

$258

Thu 9/116:05 amPDX - STL

1 stop25h 01mFrontier

Sat 9/137:55 pmSTL - PDX

2 stops16h 38mFrontier

Deal found 8/14

$260

Fri 8/155:50 pmPDX - STL

1 stop13h 21mFrontier

Fri 8/227:54 pmSTL - PDX

1 stop6h 21mFrontier

Deal found 8/13

$261

Wed 10/112:07 pmPDX - STL

2 stops18h 59mMultiple Airlines

Tue 10/77:52 pmSTL - PDX

1 stop17h 56mMultiple Airlines

Deal found 8/14

$262

Tue 12/301:44 amPDX - STL

1 stop7h 58mAmerican Airlines

Tue 1/611:58 amSTL - PDX

1 stop6h 59mAmerican Airlines

Deal found 8/14

$263

Wed 10/112:45 amPDX - STL

1 stop8h 45mDelta

Tue 10/76:00 amSTL - PDX

1 stop7h 01mDelta

Deal found 8/14

$264

Thu 10/236:40 amPDX - STL

2 stops10h 40mSouthwest

Mon 10/275:40 amSTL - PDX

1 stop6h 30mSouthwest

Deal found 8/14

$265

Sun 10/512:22 pmBOI - STL

1 stop19h 44mFrontier

Thu 10/97:52 pmSTL - BOI

1 stop16h 51mFrontier

Deal found 8/12

$267

Thu 10/1612:43 pmPDX - STL

1 stop18h 24mFrontier

Mon 10/207:52 pmSTL - PDX

1 stop17h 56mFrontier

Deal found 8/13

$267

Best flights from Oregon to St. Louis
Discover carefully curated flight deals from Oregon to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 14, 2025.

Tue 9/91:38 pmBOI - STL

1 stop5h 37mAmerican Airlines

Tue 9/167:23 amSTL - BOI

1 stop6h 04mAmerican Airlines

Deal found 8/13

$251

Thu 10/2312:40 amPDX - STL

1 stop6h 11mDelta

Mon 10/275:31 pmSTL - PDX

2 stops17h 05mDelta

Deal found 8/14

$257

Tue 11/115:00 amPDX - STL

2 stops10h 20mSouthwest

Fri 11/146:35 pmSTL - PDX

1 stop6h 35mSouthwest

Deal found 8/12

$258

Thu 9/116:05 amPDX - STL

1 stop25h 01mFrontier

Sat 9/137:55 pmSTL - PDX

2 stops16h 38mFrontier

Deal found 8/14

$260

Wed 10/112:07 pmPDX - STL

2 stops18h 59mMultiple Airlines

Tue 10/77:52 pmSTL - PDX

1 stop17h 56mMultiple Airlines

Deal found 8/14

$262

Thu 10/26:35 amBOI - STL

1 stop7h 04mAlaska Airlines

Mon 10/63:57 pmSTL - BOI

1 stop8h 59mAlaska Airlines

Deal found 8/12

$302

Thu 9/112:13 pmBOI - STL

2 stops8h 40mUnited Airlines

Sun 9/145:15 amSTL - BOI

1 stop5h 27mUnited Airlines

Deal found 8/13

$306

Thu 9/181:36 pmEUG - STL

1 stop8h 23mHawaiian Airlines

Mon 9/296:30 pmSTL - EUG

1 stop7h 55mHawaiian Airlines

Deal found 8/12

$324

Thu 10/2310:29 amPDX - STL

1 stop7h 57mAmerican Airlines

Mon 10/275:02 pmSTL - PDX

1 stop8h 06mAmerican Airlines

Deal found 8/14

$253

Tue 10/2112:40 amPDX - STL

1 stop6h 11mDelta

Mon 10/275:31 pmSTL - PDX

2 stops17h 05mDelta

Deal found 8/12

$257

Thu 10/3012:52 pmPDX - STL

1 stop18h 15mFrontier

Sun 11/22:42 pmSTL - PDX

1 stop30h 02mFrontier

Deal found 8/14

$261

Thu 10/212:07 pmPDX - STL

2 stops18h 59mMultiple Airlines

Tue 10/77:52 pmSTL - PDX

1 stop17h 56mMultiple Airlines

Deal found 8/14

$262

Last-minute flights from Oregon to St. Louis
Discover last-minute flight deals from Oregon to St. Louis. Data last updated August 14, 2025 and is based on user searches.

Fri 8/155:50 pmPDX - STL

1 stop13h 21mFrontier

Fri 8/227:54 pmSTL - PDX

1 stop6h 21mFrontier

Deal found 8/13

$261

Mon 8/185:50 pmPDX - STL

1 stop13h 21mFrontier

Tue 8/197:54 pmSTL - PDX

1 stop28h 45mFrontier

Deal found 8/14

$272

Tue 8/196:51 amPDX - STL

1 stop24h 20mFrontier

Wed 8/207:54 pmSTL - PDX

1 stop17h 29mFrontier

Deal found 8/13

$317

Tue 8/1911:25 amBOI - STL

1 stop6h 10mHawaiian Airlines

Thu 8/213:35 pmSTL - BOI

1 stop9h 24mHawaiian Airlines

Deal found 8/13

$690

Fri 8/2212:18 pmPDX - STL

1 stop18h 53mFrontier

Sun 8/247:54 pmSTL - PDX

1 stop17h 29mFrontier

Deal found 8/13

$285

Fri 8/227:04 pmPDX - STL

2 stops12h 07mFrontier

Thu 8/287:54 pmSTL - PDX

1 stop6h 21mFrontier

Deal found 8/13

$351

Fri 8/227:04 pmPDX - STL

2 stops12h 07mFrontier

Sat 8/307:54 pmSTL - PDX

1 stop17h 29mFrontier

Deal found 8/13

$414

Fri 8/2212:46 amPDX - STL

1 stop8h 03mDelta

Sun 8/317:35 amSTL - PDX

1 stop6h 38mDelta

Deal found 8/14

$415

Fri 8/221:31 pmRDM - STL

1 stop8h 28mHawaiian Airlines

Sun 8/246:00 amSTL - RDM

1 stop8h 37mHawaiian Airlines

Deal found 8/14

$564

Fri 8/227:30 pmRDM - STL

2 stops11h 06mDelta

Sun 8/247:11 pmSTL - RDM

1 stop6h 33mDelta

Deal found 8/14

$570

Sat 8/236:27 amPDX - STL

1 stop24h 44mFrontier

Sun 8/247:54 pmSTL - PDX

1 stop17h 29mFrontier

Deal found 8/13

$282

Sat 8/236:27 amPDX - STL

1 stop24h 44mFrontier

Sat 8/307:54 pmSTL - PDX

1 stop17h 29mFrontier

Deal found 8/13

$420

One-way flights from Oregon to St. Louis
Search for one-way flight options from Oregon to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 14, 2025.

Fri 9/511:23 amPDX - STL

1 stop7h 17mFrontier

Deal found 8/14

$80

Thu 9/1112:22 pmBOI - STL

1 stop19h 44mFrontier

Deal found 8/14

$84

Tue 9/26:51 amPDX - STL

1 stop24h 20mFrontier

Deal found 8/14

$86

Wed 8/276:51 amPDX - STL

1 stop24h 20mFrontier

Deal found 8/13

$88

Tue 8/266:51 amPDX - STL

1 stop24h 20mFrontier

Deal found 8/13

$102

Thu 11/131:35 pmPDX - STL

1 stop8h 24mHawaiian Airlines

Deal found 8/13

$107

Thu 9/117:22 pmPDX - STL

2 stops11h 44mFrontier

Deal found 8/14

$110

Thu 8/2112:18 pmPDX - STL

1 stop18h 53mFrontier

Deal found 8/14

$111

Mon 2/96:00 amPDX - STL

1 stop5h 52mAlaska Airlines

Deal found 8/14

$113

Thu 12/46:40 amPDX - STL

1 stop8h 25mSouthwest

Deal found 8/14

$114

Mon 12/812:55 amPDX - STL

1 stop8h 37mDelta

Deal found 8/14

$115

Thu 9/112:16 pmBOI - STL

2 stops17h 50mMultiple Airlines

Deal found 8/14

$123

Fly from

Fly to

Route

Depart

Return

Price

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 9/9

1:38 pm-8:15 pm

1 stop5h 37m

Lambert-St Louis

Tue 9/16

7:23 am-12:27 pm

1 stop6h 04m

$251

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 10/23

10:29 am-8:26 pm

1 stop7h 57m

Lambert-St Louis

Mon 10/27

5:02 pm-11:08 pm

1 stop8h 06m

$253

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 10/23

12:40 am-8:51 am

1 stop6h 11m

Lambert-St Louis

Mon 10/27

5:31 pm-8:36 am

2 stops17h 05m

$257

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 10/21

12:40 am-8:51 am

1 stop6h 11m

Lambert-St Louis

Mon 10/27

5:31 pm-8:36 am

2 stops17h 05m

$257

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 11/11

5:00 am-5:20 pm

2 stops10h 20m

Lambert-St Louis

Fri 11/14

6:35 pm-11:10 pm

1 stop6h 35m

$258

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 9/11

6:05 am-9:06 am

1 stop25h 01m

Lambert-St Louis

Sat 9/13

7:55 pm-10:33 am

2 stops16h 38m

$260

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 10/30

12:52 pm-9:07 am

1 stop18h 15m

Lambert-St Louis

Sun 11/2

2:42 pm-6:44 pm

1 stop30h 02m

$261

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 10/1

12:07 pm-9:06 am

2 stops18h 59m

Lambert-St Louis

Tue 10/7

7:52 pm-11:48 am

1 stop17h 56m

$262

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 10/2

12:07 pm-9:06 am

2 stops18h 59m

Lambert-St Louis

Tue 10/7

7:52 pm-11:48 am

1 stop17h 56m

$262

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 12/30

1:44 am-11:42 am

1 stop7h 58m

Lambert-St Louis

Tue 1/6

11:58 am-4:57 pm

1 stop6h 59m

$263

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 60 results

...

Best time to book a flight from Oregon to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Oregon with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Oregon to St. Louis

What is the cheapest month to book a flight from Oregon to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Oregon to St. Louis (average of $311). Flying from Oregon to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from OR to STL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Oregon to St. Louis as you normally would.

Related info for your journey

What airport do you fly into for flights to St. Louis from Oregon?
Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to St. Louis from Oregon.
What are the cheapest airlines to fly from Oregon to St. Louis one-way?
The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $80. However, be on the lookout for offers from Hawaiian Airlines and Delta, as they are both options that can get you from Oregon to St. Louis for a low price.
What are the most popular routes from Oregon to St. Louis?
While some choose either Boise Air Term. Gowen Fld - Lambert-St Louis or Bend/Redmond - Lambert-St Louis, Portland - Lambert-St Louis is the most popular route from Oregon to St. Louis.
What are the cheapest flights from Oregon to St. Louis?
On average you can expect to pay $490 for a flight from Oregon to St. Louis. The cheapest flight overall is $148 while the most popular route, (Portland - Lambert-St Louis) is currently priced at $201.
Can I find deals for flights from Oregon to St. Louis that include hotel bookings?
Yes. In addition to deals on Oregon to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Oregon to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Oregon to St. Louis.
Can I find deals for business class flights from Oregon to St. Louis?
Yes. Cheapflights offers flight deals from Oregon to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Oregon to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Oregon to St. Louis (average of $311). Flying from Oregon to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

O'Fallon

Fairview Heights

Maryland Heights

Collinsville

Eureka

St. Peters

Glencoe

Alton

Chesterfield

Farmington

Festus

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Top 6 airlines flying from Oregon to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$110	Average$226	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$192	Average$427	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$226	Average$429	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$226	Average$516	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$235	Average$475	FlexibilityNo cancel fee	On-time75%
Southwest	Cheapest$251	Average$443	FlexibilityNo cancel fee	On-time63%

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$80+ Cheap flights from Oregon to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/5. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Oregon to St. Louis with Cheapflights

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Cheap flight deals from Oregon to St. Louis

Keep the following information in mind while searching for Oregon to St. Louis flight deals. Data was last updated August 14, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Oregon to St. Louis

Cheapest flights from Oregon to St. LouisExplore the most affordable flight options available from Oregon to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

Explore the most affordable flight options available from Oregon to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Oregon to St. Louis that are best for you.

Best time to book a flight from Oregon to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Oregon with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Oregon to St. Louis

What is the cheapest month to book a flight from Oregon to St. Louis?

What is the cheapest time of day to fly from OR to STL?

Find hourly flight availability from Oregon to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

Related info for your journey

Find useful and relevant information for your journey from Oregon to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to St. Louis from Oregon?

What are the cheapest airlines to fly from Oregon to St. Louis one-way?

What are the most popular routes from Oregon to St. Louis?

What are the cheapest flights from Oregon to St. Louis?

Can I find deals for flights from Oregon to St. Louis that include hotel bookings?

How can I find direct flights from Oregon to St. Louis?

Can I find deals for business class flights from Oregon to St. Louis?

What is the cheapest month to book a flight from Oregon to St. Louis?

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Alternative routes for Oregon to St. Louis

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Top 6 airlines flying from Oregon to St. Louis

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Cheapest flights from Oregon to St. Louis
Explore the most affordable flight options available from Oregon to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.