$121+ Cheap flights from Portland to St. Louis (PDX - 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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
Sep 6 — Sep 131
Round-trip
1 adult, Economy
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Find cheap flights from Portland to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Portland to Lambert-St Louis are usually found in November or May, booked 73 days in advance, depart on a Tuesday or Friday and return on a Tuesday
Cheap flight deals from Portland to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Portland to St. LouisExplore the most affordable flight options available from Portland to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 7, 2026.
Explore the most affordable flight options available from Portland to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 7, 2026.
This CheapOair deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/129:34 pm -
1 stop25h 43m
Mon 10/198:10 pm -
1 stop22h 25m
Deal found 8/2![Frontier logo]()
$240
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2212:34 pm -
1 stop28h 41m
Thu 10/298:10 pm -
1 stop22h 25m
Deal found 8/2![Frontier logo]()
$247
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1712:38 pm -
1 stop28h 39m
Sun 9/208:10 pm -
1 stop17h 33m
Deal found 8/2![Frontier logo]()
$252
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2312:34 pm -
1 stop28h 41m
Thu 10/298:10 pm -
1 stop22h 25m
Deal found 8/2![Frontier logo]()
$255
This CheapOair deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:56 pm -
1 stop23h 17m
Wed 9/912:17 pm -
1 stop25h 19m
Deal found 8/3![Frontier logo]()
$259
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/53:47 pm -
1 stop25h 28m
Thu 11/128:10 pm -
1 stop22h 25m
Deal found 8/2![Frontier logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:38 pm -
2 stops22h 32m
Sun 9/131:02 pm -
1 stop24h 41m
Deal found 8/2![Frontier logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2512:34 pm -
1 stop28h 41m
Thu 10/298:10 pm -
1 stop22h 25m
Deal found 8/2![Frontier logo]()
$272
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1612:34 pm -
1 stop28h 41m
Sun 10/2510:35 am -
2 stops32h 00m
Deal found 8/2![Frontier logo]()
$273
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/215:35 pm -
2 stops14h 05m
Thu 10/298:10 pm -
1 stop22h 25m
Deal found 8/2![Frontier logo]()
$275
This CheapOair deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:47 pm -
1 stop26h 03m
Sun 8/236:45 pm -
1 stop24h 36m
Deal found 8/2![Frontier logo]()
$278
This Kiwi.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1812:38 pm -
1 stop28h 39m
Fri 9/255:19 pm -
2 stops20h 17m
Deal found 8/4![Frontier logo]()
$279
Best flights from Portland to St. LouisDiscover carefully curated flight deals from Portland to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 7, 2026.
Discover carefully curated flight deals from Portland to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 7, 2026.
This Southwest deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1611:30 pm -
1 stop9h 00m
Sun 9/209:55 pm -
Nonstop4h 15m
Deal found 8/2![Southwest logo]()
$323
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/26:15 am -
1 stop8h 19m
Sun 12/65:30 pm -
1 stop8h 17m
Deal found 8/3![Delta logo]()
$349
This Alaska Airlines deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:09 am -
1 stop6h 35m
Tue 10/137:02 am -
1 stop8h 22m
Deal found 8/6![Alaska Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/191:35 pm -
1 stop6h 50m
Sat 9/268:30 am -
Nonstop4h 10m
Deal found 8/5![Southwest logo]()
$327
This Delta deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2312:45 am -
1 stop6h 34m
Fri 11/276:20 am -
1 stop6h 16m
Deal found 8/6![Delta logo]()
$349
This Southwest deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/311:20 am -
2 stops9h 30m
Sat 10/104:40 pm -
1 stop7h 00m
Deal found 8/2![Southwest logo]()
$338
This Delta deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/223:10 pm -
1 stop6h 08m
Sun 1/243:45 pm -
1 stop6h 38m
Deal found 8/2![Delta logo]()
$349
This Southwest deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:30 pm -
1 stop6h 15m
Wed 9/2312:20 pm -
2 stops9h 35m
Deal found 8/5![Southwest logo]()
$348
This Delta deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1912:25 am -
1 stop6h 15m
Wed 9/232:25 pm -
2 stops9h 37m
Deal found 8/4![Delta logo]()
$376
This Southwest deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:00 am -
1 stop7h 25m
Sat 8/298:30 am -
Nonstop4h 10m
Deal found 8/4![Southwest logo]()
$368
This Southwest deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/138:00 am -
2 stops9h 10m
Sun 11/156:10 am -
1 stop6h 30m
Deal found 8/2![Southwest logo]()
$379
Last-minute flights from Portland to St. LouisDiscover last-minute flight deals from Portland to St. Louis. Data last updated August 7, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to St. Louis. Data last updated August 7, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:47 pm -
1 stop26h 03m
Sun 8/236:45 pm -
1 stop24h 36m
Deal found 8/2![Frontier logo]()
$278
This CheapOair deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:56 pm -
1 stop23h 17m
Wed 9/912:17 pm -
1 stop25h 19m
Deal found 8/3![Frontier logo]()
$259
This Alaska Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/211:16 am -
Nonstop3h 54m
Wed 9/96:08 pm -
Nonstop4h 12m
Deal found 8/3![Alaska Airlines logo]()
$297
This CheapOair deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/31:47 pm -
1 stop26h 03m
Sun 9/66:45 pm -
1 stop18h 03m
Deal found 8/4![Frontier logo]()
$290
This CheapOair deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:38 pm -
1 stop28h 39m
Sun 9/131:02 pm -
1 stop24h 41m
Deal found 8/2![Frontier logo]()
$240
This Alaska Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1611:16 am -
Nonstop3h 54m
Tue 9/226:29 am -
1 stop9h 08m
Deal found 8/3![Alaska Airlines logo]()
$307
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1712:38 pm -
1 stop28h 39m
Sun 9/208:10 pm -
1 stop17h 33m
Deal found 8/2![Frontier logo]()
$252
This Kiwi.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1812:38 pm -
1 stop28h 39m
Fri 9/255:19 pm -
2 stops20h 17m
Deal found 8/4![Frontier logo]()
$279
One-way flights from Portland to St. LouisSearch for one-way flight options from Portland to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 7, 2026.
Search for one-way flight options from Portland to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 7, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:38 pm -
1 stop28h 39m
Deal found 8/2![Frontier logo]()
$121
This Trip.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2912:20 pm -
1 stop28h 53m
Deal found 8/5![Frontier logo]()
$123
This Trip.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/301:47 pm -
1 stop26h 03m
Deal found 8/2![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/53:47 pm -
1 stop25h 28m
Deal found 8/3![Frontier logo]()
$125
This CheapOair deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:38 pm -
1 stop28h 39m
Deal found 8/3![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/212:38 pm -
1 stop28h 39m
Deal found 8/2![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/512:20 pm -
1 stop28h 53m
Deal found 8/3![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/412:38 pm -
1 stop28h 39m
Deal found 8/2![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/83:47 pm -
1 stop25h 28m
Deal found 8/6![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:56 pm -
2 stops21h 26m
Deal found 8/4![Frontier logo]()
$148
Find flight deals from Portland to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 7, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $240 (CheapOair) |
One-way from | $121 (Kiwi.com) |
Popular in | July |
Cheapest in | November |
Average price | $363 |
Good round-trip deal | $337 or less |
Good one-way deal | $218 or less |
Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated August 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
Cheapest round-trip
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Wed 9/16
11:30 pm-10:30 am
1 stop9h 00m
Lambert-St Louis
Sun 9/20
9:55 pm-12:10 am
Nonstop4h 15m
$323
Quickest round-trip
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Sat 9/19
1:35 pm-10:25 pm
1 stop6h 50m
Lambert-St Louis
Sat 9/26
8:30 am-10:40 am
Nonstop4h 10m
$327
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Sat 10/3
11:20 am-10:50 pm
2 stops9h 30m
Lambert-St Louis
Sat 10/10
4:40 pm-9:40 pm
1 stop7h 00m
$338
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Fri 9/18
11:30 pm-7:45 am
1 stop6h 15m
Lambert-St Louis
Wed 9/23
12:20 pm-7:55 pm
2 stops9h 35m
$348
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Wed 12/2
6:15 am-4:34 pm
1 stop8h 19m
Lambert-St Louis
Sun 12/6
5:30 pm-11:47 pm
1 stop8h 17m
$349
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Mon 11/23
12:45 am-9:19 am
1 stop6h 34m
Lambert-St Louis
Fri 11/27
6:20 am-10:36 am
1 stop6h 16m
$349
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Fri 1/22
3:10 pm-11:18 pm
1 stop6h 08m
Lambert-St Louis
Sun 1/24
3:45 pm-8:23 pm
1 stop6h 38m
$349
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Sat 10/10
7:09 am-3:44 pm
1 stop6h 35m
Lambert-St Louis
Tue 10/13
7:02 am-1:24 pm
1 stop8h 22m
$357
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Sat 8/22
9:00 am-6:25 pm
1 stop7h 25m
Lambert-St Louis
Sat 8/29
8:30 am-10:40 am
Nonstop4h 10m
$368
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Sat 9/19
12:25 am-8:40 am
1 stop6h 15m
Lambert-St Louis
Wed 9/23
2:25 pm-10:02 pm
2 stops9h 37m
$376
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Portland to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to St. Louis in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Portland-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Portland-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Portland to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Portland with our price prediction graph.
PDX-STL
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 Portland to St. Louis
How far ahead should I book a flight from Portland to St. Louis?
The best time to book flights from Portland to St. Louis is 72 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Portland to St. Louis?
Currently, November is the cheapest month in which you can book a flight from Portland to St. Louis (average of $302). Flying from Portland to St. Louis in July is currently the most expensive (average of $417). 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 PDX to STL?
Find hourly flight availability from Portland 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 7, 2026.
When flying from Portland to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated August 7, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andDelta from Portland to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Related info for your journey
Find useful and relevant information for your journey from Portland to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington
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Portland and St. Louis flights
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Top 6 airlines flying from Portland to St. Louis
Discover the top 6 airlines that operate flights from Portland to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 7, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$75 | Average$282 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$335 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$208 | Average$376 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$213 | Average$387 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$248 | Average$413 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$381 | FlexibilityNo cancel fee | On-time69% |