$126+ 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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
Jul 17 — Jul 241
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 Friday or Monday and return on a Tuesday
Cheap flight deals from Portland to St. Louis
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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 June 17, 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 June 17, 2026.
This Frontier deal was found by Cheapflights users on 6/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/119:34 pm
PDX
- STL
1 stop12h 17m
Frontier
Sun 9/1312:46 pm
STL
- PDX
1 stop9h 53m
Frontier
Deal found 6/17![Frontier logo]()
$240
This CheapOair deal was found by Cheapflights users on 6/12. 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 7/295:21 pm
PDX
- STL
1 stop24h 02m
Frontier
Tue 8/48:08 pm
STL
- PDX
1 stop22h 28m
Frontier
Deal found 6/12![Frontier logo]()
$275
This Expedia deal was found by Cheapflights users on 6/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/189:34 pm
PDX
- STL
1 stop12h 17m
Frontier
Mon 9/218:10 pm
STL
- PDX
1 stop20h 17m
Frontier
Deal found 6/17![Frontier logo]()
$276
This CheapOair deal was found by Cheapflights users on 6/16. 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 8/136:49 pm
PDX
- STL
1 stop21h 26m
Frontier
Mon 8/178:08 pm
STL
- PDX
1 stop22h 49m
Frontier
Deal found 6/16![Frontier logo]()
$286
This CheapOair deal was found by Cheapflights users on 6/17. 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.
Fri 7/315:49 pm
PDX
- STL
1 stop22h 26m
Frontier
Mon 8/38:08 pm
STL
- PDX
1 stop22h 23m
Frontier
Deal found 6/17![Frontier logo]()
$289
This Orbitz deal was found by Cheapflights users on 6/16. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/173:22 pm
PDX
- STL
1 stop25h 53m
Multiple Airlines
Tue 9/226:08 pm
STL
- PDX
Nonstop4h 12m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$294
This Southwest deal was found by Cheapflights users on 6/15. 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.
Sun 8/2311:30 pm
PDX
- STL
1 stop7h 45m
Southwest
Sat 8/298:30 am
STL
- PDX
Nonstop4h 10m
Southwest
Deal found 6/15![Southwest logo]()
$309
This CheapOair deal was found by Cheapflights users on 6/16. 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 6/175:20 pm
PDX
- STL
1 stop23h 33m
Frontier
Wed 7/87:03 pm
STL
- PDX
1 stop25h 01m
Frontier
Deal found 6/16![Frontier logo]()
$310
This CheapOair deal was found by Cheapflights users on 6/15. 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 6/258:42 pm
PDX
- STL
1 stop15h 24m
Frontier
Mon 6/292:56 pm
STL
- PDX
1 stop6h 51m
Frontier
Deal found 6/15![Frontier logo]()
$311
This Expedia deal was found by Cheapflights users on 6/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/189:34 pm
PDX
- STL
1 stop12h 17m
Multiple Airlines
Mon 9/216:08 pm
STL
- PDX
Nonstop4h 12m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$314
This CheapOair deal was found by Cheapflights users on 6/17. 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 7/85:21 pm
PDX
- STL
1 stop24h 02m
Frontier
Sun 7/128:08 pm
STL
- PDX
1 stop22h 43m
Frontier
Deal found 6/17![Frontier logo]()
$315
This Delta deal was found by Cheapflights users on 6/15. 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 7/1312:33 am
PDX
- STL
1 stop6h 13m
Delta
Mon 7/207:55 pm
STL
- PDX
1 stop5h 49m
Delta
Deal found 6/15![Delta logo]()
$319
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 June 17, 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 June 17, 2026.
This Southwest deal was found by Cheapflights users on 6/15. 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.
Sun 8/2310:45 pm
PDX
- STL
1 stop10h 50m
Southwest
Sat 8/295:20 pm
STL
- PDX
1 stop6h 05m
Southwest
Deal found 6/15![Southwest logo]()
$319
This Delta deal was found by Cheapflights users on 6/15. 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 8/226:15 am
PDX
- STL
1 stop8h 29m
Delta
Sun 8/307:45 pm
STL
- PDX
1 stop5h 54m
Delta
Deal found 6/15![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 6/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/102:25 pm
PDX
- STL
1 stop7h 04m
United Airlines
Sat 7/187:23 pm
STL
- PDX
1 stop7h 27m
United Airlines
Deal found 6/15![United Airlines logo]()
$362
This Southwest deal was found by Cheapflights users on 6/12. 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 7/295:15 am
PDX
- STL
1 stop9h 05m
Southwest
Wed 7/295:55 pm
STL
- PDX
1 stop7h 40m
Southwest
Deal found 6/12![Southwest logo]()
$319
This Southwest deal was found by Cheapflights users on 6/13. 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.
Thu 8/276:05 am
PDX
- STL
1 stop8h 15m
Southwest
Sun 8/306:00 am
STL
- PDX
1 stop8h 45m
Southwest
Deal found 6/13![Southwest logo]()
$319
This United Airlines deal was found by Cheapflights users on 6/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/305:00 am
PDX
- STL
1 stop5h 42m
United Airlines
Sat 7/47:23 pm
STL
- PDX
1 stop7h 27m
United Airlines
Deal found 6/15![United Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 6/13. 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.
Thu 8/1311:30 pm
PDX
- STL
1 stop7h 45m
Southwest
Sun 8/166:10 am
STL
- PDX
1 stop6h 25m
Southwest
Deal found 6/13![Southwest logo]()
$319
This Southwest deal was found by Cheapflights users on 6/13. 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.
Tue 7/285:50 am
PDX
- STL
2 stops9h 55m
Southwest
Sat 8/14:10 pm
STL
- PDX
1 stop9h 45m
Southwest
Deal found 6/13![Southwest logo]()
$330
This Southwest deal was found by Cheapflights users on 6/14. 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 9/910:45 pm
PDX
- STL
1 stop10h 50m
Southwest
Wed 9/165:35 am
STL
- PDX
2 stops11h 50m
Southwest
Deal found 6/14![Southwest logo]()
$330
This Southwest deal was found by Cheapflights users on 6/16. 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 7/229:20 pm
PDX
- STL
1 stop8h 10m
Southwest
Sun 7/264:45 pm
STL
- PDX
Nonstop4h 05m
Southwest
Deal found 6/16![Southwest logo]()
$389
Last-minute flights from Portland to St. LouisDiscover last-minute flight deals from Portland to St. Louis. Data last updated June 17, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to St. Louis. Data last updated June 17, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 6/16. 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 6/175:20 pm
PDX
- STL
1 stop23h 33m
Frontier
Wed 7/87:03 pm
STL
- PDX
1 stop25h 01m
Frontier
Deal found 6/16![Frontier logo]()
$310
This CheapOair deal was found by Cheapflights users on 6/12. 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.
Fri 6/198:42 pm
PDX
- STL
1 stop15h 24m
Frontier
Mon 6/297:38 pm
STL
- PDX
1 stop22h 57m
Frontier
Deal found 6/12![Frontier logo]()
$341
This CheapOair deal was found by Cheapflights users on 6/15. 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 6/258:42 pm
PDX
- STL
1 stop15h 24m
Frontier
Mon 6/292:56 pm
STL
- PDX
1 stop6h 51m
Frontier
Deal found 6/15![Frontier logo]()
$311
This Trip.com deal was found by Cheapflights users on 6/16. 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 6/2712:26 pm
PDX
- STL
1 stop28h 27m
Frontier
Mon 6/292:56 pm
STL
- PDX
1 stop6h 51m
Frontier
Deal found 6/16![Frontier logo]()
$335
This CheapOair deal was found by Cheapflights users on 6/17. 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 7/85:21 pm
PDX
- STL
1 stop24h 02m
Frontier
Sun 7/128:08 pm
STL
- PDX
1 stop22h 43m
Frontier
Deal found 6/17![Frontier logo]()
$315
This Southwest deal was found by Cheapflights users on 6/15. 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 7/106:00 am
PDX
- STL
1 stop6h 10m
Southwest
Sat 7/185:35 pm
STL
- PDX
Nonstop4h 05m
Southwest
Deal found 6/15![Southwest logo]()
$338
This Delta deal was found by Cheapflights users on 6/15. 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 7/1312:33 am
PDX
- STL
1 stop6h 13m
Delta
Mon 7/207:55 pm
STL
- PDX
1 stop5h 49m
Delta
Deal found 6/15![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 6/15. 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.
Tue 7/145:50 am
PDX
- STL
2 stops9h 55m
Southwest
Mon 7/207:20 pm
STL
- PDX
1 stop8h 05m
Southwest
Deal found 6/15![Southwest logo]()
$324
This Southwest deal was found by Cheapflights users on 6/13. 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.
Tue 7/285:50 am
PDX
- STL
2 stops9h 55m
Southwest
Sat 8/14:10 pm
STL
- PDX
1 stop9h 45m
Southwest
Deal found 6/13![Southwest logo]()
$330
This CheapOair deal was found by Cheapflights users on 6/12. 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 7/295:21 pm
PDX
- STL
1 stop24h 02m
Frontier
Tue 8/48:08 pm
STL
- PDX
1 stop22h 28m
Frontier
Deal found 6/12![Frontier logo]()
$275
This CheapOair deal was found by Cheapflights users on 6/15. 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 7/295:21 pm
PDX
- STL
1 stop24h 02m
Frontier
Mon 8/38:08 pm
STL
- PDX
1 stop22h 23m
Frontier
Deal found 6/15![Frontier logo]()
$339
This CheapOair deal was found by Cheapflights users on 6/17. 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.
Fri 7/315:49 pm
PDX
- STL
1 stop22h 26m
Frontier
Mon 8/38:08 pm
STL
- PDX
1 stop22h 23m
Frontier
Deal found 6/17![Frontier logo]()
$289
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 June 17, 2026.
Search for one-way flight options from Portland to St. Louis. Find affordable one-way fares based on user searches. Data last updated June 17, 2026.
This Frontier deal was found by Cheapflights users on 6/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/119:34 pm
PDX
- STL
1 stop12h 17m
Frontier
Deal found 6/16![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 6/12. 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.
Tue 8/115:16 pm
PDX
- STL
1 stop24h 07m
Frontier
Deal found 6/12![Frontier logo]()
$128
This Trip.com deal was found by Cheapflights users on 6/17. 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.
Fri 8/145:49 pm
PDX
- STL
1 stop22h 26m
Frontier
Deal found 6/17![Frontier logo]()
$129
This Trip.com deal was found by Cheapflights users on 6/17. 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.
Tue 7/145:16 pm
PDX
- STL
1 stop24h 07m
Frontier
Deal found 6/17![Frontier logo]()
$130
This CheapOair deal was found by Cheapflights users on 6/17. 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.
Fri 7/315:49 pm
PDX
- STL
1 stop22h 26m
Frontier
Deal found 6/17![Frontier logo]()
$131
This Trip.com deal was found by Cheapflights users on 6/17. 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.
Fri 7/36:19 pm
PDX
- STL
1 stop17h 47m
Frontier
Deal found 6/17![Frontier logo]()
$139
This Southwest deal was found by Cheapflights users on 6/15. 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 9/129:45 am
PDX
- STL
Nonstop3h 45m
Southwest
Deal found 6/15![Southwest logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 8/66:49 pm
PDX
- STL
1 stop21h 26m
Frontier
Deal found 6/12![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 6/16. 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 8/276:19 pm
PDX
- STL
1 stop23h 17m
Frontier
Deal found 6/16![Frontier logo]()
$155
This CheapOair deal was found by Cheapflights users on 6/17. 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 8/55:21 pm
PDX
- STL
1 stop24h 02m
Frontier
Deal found 6/17![Frontier logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 8/125:21 pm
PDX
- STL
1 stop24h 02m
Frontier
Deal found 6/12![Frontier logo]()
$159
This Delta deal was found by Cheapflights users on 6/17. 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 7/1012:33 am
PDX
- STL
1 stop7h 55m
Delta
Deal found 6/17![Delta logo]()
$160
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 June 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $240 (Frontier) |
One-way from | $126 (Frontier) |
Popular in | July |
Cheapest in | November |
Average price | $425 |
Good round-trip deal | $377 or less |
Good one-way deal | $244 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 June 17, 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 - STL
PDXSTL
Portland
Sun 8/23
10:45 pm-11:35 am
1 stop10h 50m
Lambert-St Louis
Sat 8/29
5:20 pm-9:25 pm
1 stop6h 05m
$319
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Sat 8/22
6:15 am-4:44 pm
1 stop8h 29m
Lambert-St Louis
Sun 8/30
7:45 pm-11:39 pm
1 stop5h 54m
$319
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Wed 7/29
5:15 am-4:20 pm
1 stop9h 05m
Lambert-St Louis
Wed 7/29
5:55 pm-11:35 pm
1 stop7h 40m
$319
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Thu 8/27
6:05 am-4:20 pm
1 stop8h 15m
Lambert-St Louis
Sun 8/30
6:00 am-12:45 pm
1 stop8h 45m
$319
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Thu 8/13
11:30 pm-9:15 am
1 stop7h 45m
Lambert-St Louis
Sun 8/16
6:10 am-10:35 am
1 stop6h 25m
$319
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Tue 7/28
5:50 am-5:45 pm
2 stops9h 55m
Lambert-St Louis
Sat 8/1
4:10 pm-11:55 pm
1 stop9h 45m
$330
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Wed 9/9
10:45 pm-11:35 am
1 stop10h 50m
Lambert-St Louis
Wed 9/16
5:35 am-3:25 pm
2 stops11h 50m
$330
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Fri 7/10
2:25 pm-11:29 pm
1 stop7h 04m
Lambert-St Louis
Sat 7/18
7:23 pm-12:50 am
1 stop7h 27m
$362
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Tue 6/30
5:00 am-12:42 pm
1 stop5h 42m
Lambert-St Louis
Sat 7/4
7:23 pm-12:50 am
1 stop7h 27m
$377
Quickest round-trip
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Wed 7/22
9:20 pm-7:30 am
1 stop8h 10m
Lambert-St Louis
Sun 7/26
4:45 pm-6:50 pm
Nonstop4h 05m
$389
Showing 1-10 of 21 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 June.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | 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 $440). 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 June 17, 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 June 17, 2026.
See what other customers who have flown with Alaska Airlines,Southwest, 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.
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
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
O'Fallon
Fenton
Swansea
Fairview Heights
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Alton
Farmington
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Portland and St. Louis flights
Browse other Portland and St. Louis flight options. Last updated on June 17, 2026.
Other flights from Portland
Browse through other flights departing from Portland. Flights are based on user searches made on Cheapflights and were last updated on June 17, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 17, 2026.
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 June 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$75 | Average$287 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$362 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$197 | Average$384 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$228 | Average$395 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$248 | Average$422 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$381 | FlexibilityNo cancel fee | On-time69% |