$348+ Cheap flights from St. Louis (STL) to Portugal
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 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LIS
Sep 10 — Sep 171
Round-trip
1 adult, Economy
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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
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Cheapest flights from St. Louis to PortugalExplore the most affordable flight options available from St. Louis to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 11, 2026.
Explore the most affordable flight options available from St. Louis to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 11, 2026.
This Gotogate deal was found by Cheapflights users on 8/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/274:05 pm -
1 stop12h 15m
Wed 11/115:00 am -
1 stop14h 45m
Deal found 8/9![Multiple Airlines logo]()
$700
This Gotogate deal was found by Cheapflights users on 8/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/44:05 pm -
1 stop10h 50m
Fri 11/205:00 am -
1 stop14h 45m
Deal found 8/10![Multiple Airlines logo]()
$703
This Expedia deal was found by Cheapflights users on 8/9. 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.
Tue 10/276:50 pm -
2 stops23h 40m
Wed 11/115:00 am -
1 stop14h 45m
Deal found 8/9![Lufthansa logo]()
$709
This Expedia deal was found by Cheapflights users on 8/10. 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.
Wed 11/1811:32 am -
2 stops18h 18m
Wed 11/258:45 pm -
2 stops18h 45m
Deal found 8/10![Iberia logo]()
$726
This Expedia deal was found by Cheapflights users on 8/9. 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.
Tue 11/109:50 am -
2 stops28h 10m
Tue 11/178:20 am -
2 stops17h 02m
Deal found 8/9![Iberia logo]()
$735
This Delta deal was found by Cheapflights users on 8/11. 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 11/46:47 am -
2 stops19h 13m
Tue 11/105:00 am -
2 stops24h 23m
Deal found 8/11![Delta logo]()
$740
This Expedia deal was found by Cheapflights users on 8/9. 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.
Mon 12/71:08 pm -
2 stops16h 37m
Thu 12/106:00 am -
2 stops21h 13m
Deal found 8/9![Lufthansa logo]()
$741
This United Airlines deal was found by Cheapflights users on 8/9. 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.
Mon 12/75:20 pm -
1 stop10h 10m
Thu 12/106:00 am -
2 stops39h 26m
Deal found 8/9![United Airlines logo]()
$743
This Gotogate deal was found by Cheapflights users on 8/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1812:10 pm -
1 stop15h 10m
Tue 10/2711:20 am -
1 stop33h 06m
Deal found 8/9![Multiple Airlines logo]()
$746
This Gotogate deal was found by Cheapflights users on 8/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2812:10 pm -
1 stop15h 10m
Tue 10/135:05 am -
1 stop14h 20m
Deal found 8/9![Multiple Airlines logo]()
$752
This Justfly.com deal was found by Cheapflights users on 8/7. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1412:10 pm -
1 stop15h 10m
Wed 10/215:05 am -
1 stop14h 20m
Deal found 8/7![Multiple Airlines logo]()
$754
This United Airlines deal was found by Cheapflights users on 8/9. 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 11/105:00 pm -
1 stop10h 30m
Tue 11/1712:35 pm -
1 stop31h 10m
Deal found 8/9![United Airlines logo]()
$755
Best flights from St. Louis to PortugalDiscover carefully curated flight deals from St. Louis to Portugal that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 11, 2026.
Discover carefully curated flight deals from St. Louis to Portugal that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 11, 2026.
This Delta deal was found by Cheapflights users on 8/11. 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 11/46:47 am -
2 stops19h 13m
Tue 11/105:00 am -
2 stops24h 23m
Deal found 8/11![Delta logo]()
$740
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/77:30 am -
1 stop20h 00m
Thu 12/106:00 am -
2 stops21h 13m
Deal found 8/6![United Airlines logo]()
$745
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/104:05 pm -
1 stop11h 15m
Sat 1/163:35 pm -
2 stops53h 51m
Deal found 8/6![Multiple Airlines logo]()
$764
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/293:40 pm -
1 stop14h 05m
Wed 2/312:35 pm -
2 stops37h 05m
Deal found 8/6![Lufthansa logo]()
$828
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:00 am -
2 stops24h 05m
Mon 11/93:50 pm -
2 stops30h 53m
Deal found 8/6![British Airways logo]()
$842
This United Airlines deal was found by Cheapflights users on 8/8. 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.
Wed 11/411:29 am -
1 stop14h 41m
Tue 11/1012:50 pm -
2 stops29h 20m
Deal found 8/8![United Airlines logo]()
$756
This Delta deal was found by Cheapflights users on 8/11. 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.
Tue 11/312:00 pm -
2 stops17h 25m
Mon 11/95:00 am -
2 stops21h 51m
Deal found 8/11![Delta logo]()
$790
This United deal was found by Cheapflights users on 8/9. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/275:00 pm -
1 stop11h 30m
Fri 11/66:00 am -
1 stop13h 45m
Deal found 8/9![Multiple Airlines logo]()
$795
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Mon 11/95:00 pm -
1 stop33h 10m
Thu 11/1210:55 am -
1 stop34h 31m
Deal found 8/7![United Airlines logo]()
$785
This United Airlines deal was found by Cheapflights users on 8/9. 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 10/2711:29 am -
1 stop17h 01m
Fri 11/66:00 am -
1 stop13h 45m
Deal found 8/9![United Airlines logo]()
$795
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Thu 10/1512:10 pm -
1 stop15h 10m
Thu 10/2211:25 am -
2 stops34h 18m
Deal found 8/7![United Airlines logo]()
$805
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Wed 9/239:43 am -
2 stops19h 22m
Tue 9/2911:25 am -
2 stops39h 44m
Deal found 8/7![United Airlines logo]()
$824
This United Airlines deal was found by Cheapflights users on 8/11. 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.
Sun 9/277:30 am -
2 stops41h 30m
Mon 12/2112:35 pm -
2 stops38h 43m
Deal found 8/11![United Airlines logo]()
$876
Last-minute flights from St. Louis to PortugalDiscover last-minute flight deals from St. Louis to Portugal. Data last updated August 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Portugal. Data last updated August 11, 2026 and is based on user searches.
This oojo deal was found by Cheapflights users on 8/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/163:30 pm -
1 stop18h 10m
Tue 8/256:00 am -
2 stops19h 11m
Deal found 8/10![Lufthansa logo]()
$952
This Delta deal was found by Cheapflights users on 8/9. 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 9/231:55 pm -
2 stops19h 00m
Wed 10/75:00 am -
2 stops18h 19m
Deal found 8/9![Delta logo]()
$800
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Wed 9/239:43 am -
2 stops19h 22m
Tue 9/2911:25 am -
2 stops39h 44m
Deal found 8/7![United Airlines logo]()
$824
This United Airlines deal was found by Cheapflights users on 8/10. 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.
Sun 9/277:30 am -
1 stop20h 15m
Mon 12/2112:35 pm -
2 stops34h 33m
Deal found 8/10![United Airlines logo]()
$872
This United Airlines deal was found by Cheapflights users on 8/8. 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.
Sun 9/277:30 am -
2 stops41h 30m
Sun 10/116:00 am -
2 stops39h 43m
Deal found 8/8![United Airlines logo]()
$969
This Gotogate deal was found by Cheapflights users on 8/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2812:10 pm -
1 stop15h 10m
Tue 10/135:05 am -
1 stop14h 20m
Deal found 8/9![Multiple Airlines logo]()
$752
This United Airlines deal was found by Cheapflights users on 8/9. 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.
Mon 9/281:29 pm -
2 stops12h 51m
Tue 10/135:05 am -
1 stop14h 20m
Deal found 8/9![United Airlines logo]()
$783
This Expedia deal was found by Cheapflights users on 8/9. 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.
Mon 9/286:30 am -
1 stop20h 35m
Wed 10/78:45 pm -
2 stops32h 57m
Deal found 8/9![Iberia logo]()
$811
This Gotogate deal was found by Cheapflights users on 8/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:55 am -
1 stop20h 05m
Sun 10/116:45 am -
1 stop36h 40m
Deal found 8/9![Multiple Airlines logo]()
$837
This Air France deal was found by Cheapflights users on 8/9. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2810:05 am -
2 stops15h 55m
Tue 10/133:55 pm -
2 stops32h 20m
Deal found 8/9![Air France logo]()
$865
This United Airlines deal was found by Cheapflights users on 8/9. 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.
Mon 9/287:30 am -
3 stops19h 50m
Sun 10/116:45 am -
1 stop36h 40m
Deal found 8/9![United Airlines logo]()
$868
This Gotogate deal was found by Cheapflights users on 8/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2812:10 pm -
1 stop15h 10m
Wed 10/71:00 pm -
1 stop13h 00m
Deal found 8/9![Multiple Airlines logo]()
$869
One-way flights from St. Louis to PortugalSearch for one-way flight options from St. Louis to Portugal. Find affordable one-way fares based on user searches. Data last updated August 11, 2026.
Search for one-way flight options from St. Louis to Portugal. Find affordable one-way fares based on user searches. Data last updated August 11, 2026.
This oojo deal was found by Cheapflights users on 8/8. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/311:06 pm -
2 stops16h 59m
Deal found 8/8![British Airways logo]()
$348
This American Airlines deal was found by Cheapflights users on 8/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/122:54 pm -
2 stops15h 11m
Deal found 8/11![American Airlines logo]()
$362
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 9/232:29 pm -
3 stops50h 36m
Deal found 8/9![Multiple Airlines logo]()
$422
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 1/313:40 pm -
3 stops23h 55m
Deal found 8/8![Multiple Airlines logo]()
$442
This United Airlines deal was found by Cheapflights users on 8/9. 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.
Wed 9/236:00 pm -
1 stop10h 30m
Deal found 8/9![United Airlines logo]()
$462
This BusinessClass deal was found by Cheapflights users on 8/11. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/125:27 pm -
2 stops34h 28m
Deal found 8/11![British Airways logo]()
$740
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Sat 8/293:32 pm -
2 stops33h 23m
Deal found 8/7![United Airlines logo]()
$862
This FlightHub deal was found by Cheapflights users on 8/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/292:40 pm -
2 stops39h 20m
Deal found 8/9![Air Canada logo]()
$869
This KAYAK deal was found by Cheapflights users on 8/7. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/124:05 pm -
1 stop11h 15m
Deal found 8/7![Lufthansa logo]()
$871
This KAYAK deal was found by Cheapflights users on 8/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2912:10 pm -
1 stop12h 50m
Deal found 8/9![Lufthansa logo]()
$922
This Cathay Pacific deal was found by Cheapflights users on 8/7. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/296:00 am -
3 stops48h 00m
Deal found 8/7![Multiple Airlines logo]()
$8,392
Find flight deals from St. Louis to Portugal
Keep the following information in mind while searching for St. Louis to Portugal flight deals. Data was last updated August 11, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $700 (Gotogate) |
One-way from | $348 (oojo) |
Popular in | December |
Cheapest in | April |
Average price | $1,190 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Portugal 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 11, 2026.
Use the filters below to find and compare flights from St. Louis to Portugal that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Wed 11/4
6:47 am-8:00 am
2 stops19h 13m
Lisbon Humberto Delgado
Tue 11/10
5:00 am-11:23 pm
2 stops24h 23m
$740
St. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Mon 12/7
7:30 am-9:30 am
1 stop20h 00m
Porto
Thu 12/10
6:00 am-9:13 pm
2 stops21h 13m
$745
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Wed 11/4
11:29 am-8:10 am
1 stop14h 41m
Lisbon Humberto Delgado
Tue 11/10
12:50 pm-12:10 pm
2 stops29h 20m
$756
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Sun 1/10
4:05 pm-9:20 am
1 stop11h 15m
Lisbon Humberto Delgado
Sat 1/16
3:35 pm-3:26 pm
2 stops53h 51m
$764
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Mon 11/9
5:00 pm-8:10 am
1 stop33h 10m
Lisbon Humberto Delgado
Thu 11/12
10:55 am-3:26 pm
1 stop34h 31m
$785
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Tue 11/3
12:00 pm-11:25 am
2 stops17h 25m
Lisbon Humberto Delgado
Mon 11/9
5:00 am-8:51 pm
2 stops21h 51m
$790
Quickest round-trip
St. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Tue 10/27
5:00 pm-9:30 am
1 stop11h 30m
Porto
Fri 11/6
6:00 am-1:45 pm
1 stop13h 45m
$795
St. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Tue 10/27
11:29 am-9:30 am
1 stop17h 01m
Porto
Fri 11/6
6:00 am-1:45 pm
1 stop13h 45m
$795
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Thu 10/15
12:10 pm-9:20 am
1 stop15h 10m
Lisbon Humberto Delgado
Thu 10/22
11:25 am-3:43 pm
2 stops34h 18m
$805
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Wed 9/23
9:43 am-11:05 am
2 stops19h 22m
Lisbon Humberto Delgado
Tue 9/29
11:25 am-9:09 pm
2 stops39h 44m
$824
Showing 1-10 of 26 resultsSorted by cheapest first
Best time to book a flight from St. Louis to Portugal
Have a flexible travel schedule? Discover the best time to fly to Portugal from St. Louis with our price prediction graph.
STL-LIS
STL-OPO
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 St. Louis to Portugal
STL-PT0
STL-LIS
STL-OPO
What is the cheapest month to book a flight from St. Louis to Portugal?
Currently, February is the cheapest month in which you can book a flight from St. Louis to Portugal (average of $520). Flying from St. Louis to Portugal in December is currently the most expensive (average of $1,776). 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.
How far ahead should I book a flight from St. Louis to Portugal?
Booking 64 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Portugal. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Reviews of airlines servicing Portugal
Get insights into the airlines that provide service to Portugal. 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 Portugal. Reviews last updated August 11, 2026.
Read through reviews of airlines operating flights from St. Louis to Portugal, such as Delta,United Airlines, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.8
Entertainment
7.8
Crew
8.5
Boarding
8.1
Overall
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Entertainment
7.8
Crew
8.5
Boarding
8.1
Overall
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Entertainment
7.8
Crew
8.5
Boarding
8.1
Overall
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Entertainment
7.8
Crew
8.5
Boarding
8.1
Overall
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Entertainment
7.8
Crew
8.5
Boarding
8.1
Overall
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Entertainment
7.8
Crew
8.5
Boarding
8.1
Overall
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for St. Louis to Portugal
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Portugal by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Portugal by cabin class
Find flights from St. Louis to Portugal, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Portugal flights
Browse other St. Louis and Portugal flight options. Last updated on August 11, 2026.
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Fly to Portugal regions
Consider these flights traveling to Portugal regions.
Top 6 airlines flying from St. Louis to Portugal
Discover the top 6 airlines that operate flights from St. Louis to Portugal. 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 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$493 | Average$875 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$502 | Average$1,013 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$558 | Average$581 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$574 | Average$686 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$588 | Average$1,122 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$649 | Average$1,062 | FlexibilityNo cancel fee | On-time67% |