$349+ Cheap flights from St. Louis (STL) to Portugal
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LIS
Oct 26 — Nov 21
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Portugal 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
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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 September 26, 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 September 26, 2026.
This United Airlines deal was found by Cheapflights users on 9/22. 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 11/254:05 pm -
1 stop10h 50m
Thu 12/38:55 am -
2 stops37h 29m
Deal found 9/22![United Airlines logo]()
$579
This Justfly.com deal was found by Cheapflights users on 9/22. 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 11/259:40 am -
2 stops15h 15m
Thu 12/310:55 am -
2 stops31h 27m
Deal found 9/22![Air Canada logo]()
$583
This American Airlines deal was found by Cheapflights users on 9/21. 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 11/36:02 am -
1 stop21h 03m
Wed 11/118:20 am -
2 stops17h 02m
Deal found 9/21![American Airlines logo]()
$589
This Travelocity deal was found by Cheapflights users on 9/21. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/158:29 am -
2 stops21h 16m
Mon 11/2312:25 pm -
2 stops27h 06m
Deal found 9/21![Iberia logo]()
$590
This United Airlines deal was found by Cheapflights users on 9/23. 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 11/36:00 am -
1 stop20h 10m
Wed 11/1110:15 am -
1 stop17h 37m
Deal found 9/23![United Airlines logo]()
$595
This FlightHub deal was found by Cheapflights users on 9/22. 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.
Tue 11/31:15 pm -
2 stops16h 50m
Mon 11/96:35 pm -
2 stops30h 47m
Deal found 9/22![British Airways logo]()
$606
This Travelocity deal was found by Cheapflights users on 9/22. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/125:27 pm -
2 stops36h 18m
Tue 11/104:40 pm -
2 stops31h 37m
Deal found 9/22![Iberia logo]()
$606
This KAYAK deal was found by Cheapflights users on 9/23. 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 10/2711:29 am -
1 stop17h 01m
Fri 11/66:15 am -
2 stops21h 25m
Deal found 9/23![Lufthansa logo]()
$612
This Justfly.com deal was found by Cheapflights users on 9/22. 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.
Mon 11/21:15 pm -
1 stop13h 50m
Mon 11/912:55 pm -
2 stops33h 48m
Deal found 9/22![British Airways logo]()
$615
This Delta deal was found by Cheapflights users on 9/23. 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 10/277:00 am -
2 stops22h 35m
Fri 11/65:00 am -
2 stops21h 51m
Deal found 9/23![Delta logo]()
$617
This American Airlines deal was found by Cheapflights users on 9/21. 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.
Wed 11/411:35 am -
2 stops15h 30m
Tue 11/107:05 am -
2 stops18h 17m
Deal found 9/21![American Airlines logo]()
$619
This United Airlines deal was found by Cheapflights users on 9/23. 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 9/23![United Airlines logo]()
$631
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 September 26, 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 September 26, 2026.
This Travelocity deal was found by Cheapflights users on 9/21. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/158:29 am -
2 stops21h 16m
Mon 11/2312:25 pm -
2 stops27h 06m
Deal found 9/21![Iberia logo]()
$590
This Delta deal was found by Cheapflights users on 9/23. 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 10/277:00 am -
2 stops22h 35m
Fri 11/65:00 am -
2 stops21h 51m
Deal found 9/23![Delta logo]()
$617
This United Airlines deal was found by Cheapflights users on 9/22. 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 9/22![United Airlines logo]()
$631
This KLM deal was found by Cheapflights users on 9/24. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/810:35 am -
2 stops21h 15m
Sun 11/156:50 pm -
2 stops28h 51m
Deal found 9/24![KLM logo]()
$903
This United Airlines deal was found by Cheapflights users on 9/21. 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 11/159:59 am -
1 stop17h 31m
Mon 11/2312:35 pm -
1 stop15h 17m
Deal found 9/21![United Airlines logo]()
$634
This Mytrip deal was found by Cheapflights users on 9/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/162:00 pm -
3 stops19h 30m
Sat 10/246:20 am -
2 stops22h 53m
Deal found 9/21![Multiple Airlines logo]()
$1,275
This FlightHub deal was found by Cheapflights users on 9/21. 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 10/165:27 pm -
2 stops19h 38m
Sat 10/248:00 pm -
2 stops33h 59m
Deal found 9/21![British Airways logo]()
$1,317
This Delta deal was found by Cheapflights users on 9/22. 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 10/127:00 am -
2 stops21h 30m
Tue 11/105:55 am -
2 stops24h 01m
Deal found 9/22![Delta logo]()
$660
This United Airlines deal was found by Cheapflights users on 9/21. 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 11/144:39 pm -
2 stops34h 51m
Mon 11/2312:35 pm -
1 stop15h 17m
Deal found 9/21![United Airlines logo]()
$639
This United Airlines deal was found by Cheapflights users on 9/22. 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 11/311:29 am -
1 stop14h 41m
Mon 11/910:15 am -
1 stop17h 37m
Deal found 9/22![United Airlines logo]()
$645
This Delta deal was found by Cheapflights users on 9/25. 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 11/47:00 am -
2 stops21h 30m
Tue 11/105:00 am -
2 stops21h 29m
Deal found 9/25![Delta logo]()
$743
This KAYAK deal was found by Cheapflights users on 9/26. 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 3/135:30 am -
2 stops25h 05m
Sat 3/201:25 pm -
1 stop30h 20m
Deal found 9/26![Lufthansa logo]()
$1,674
This United Airlines deal was found by Cheapflights users on 9/22. 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 10/2112:10 pm -
1 stop15h 10m
Wed 10/2811:55 am -
2 stops32h 48m
Deal found 9/22![United Airlines logo]()
$677
This Air Canada deal was found by Cheapflights users on 9/26. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/131:08 pm -
3 stops20h 32m
Sat 3/206:05 am -
3 stops22h 14m
Deal found 9/26![Air Canada logo]()
$1,940
This United Airlines deal was found by Cheapflights users on 9/22. 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 10/125:36 pm -
2 stops31h 24m
Tue 11/1012:35 pm -
2 stops39h 17m
Deal found 9/22![United Airlines logo]()
$682
This United Airlines deal was found by Cheapflights users on 9/23. 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 11/49:59 am -
1 stop16h 11m
Tue 11/1012:20 pm -
1 stop31h 25m
Deal found 9/23![United Airlines logo]()
$697
This United Airlines deal was found by Cheapflights users on 9/21. 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 11/216:50 pm -
2 stops32h 30m
Thu 12/310:15 am -
1 stop18h 00m
Deal found 9/21![United Airlines logo]()
$699
This American Airlines deal was found by Cheapflights users on 9/24. 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.
Sun 11/811:35 am -
3 stops17h 10m
Sun 11/1511:05 am -
3 stops37h 12m
Deal found 9/24![Multiple Airlines logo]()
$1,729
This United Airlines deal was found by Cheapflights users on 9/22. 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
Fri 10/2310:25 am -
1 stop28h 23m
Deal found 9/22![United Airlines logo]()
$979
This Air Canada deal was found by Cheapflights users on 9/26. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/134:05 pm -
2 stops17h 35m
Sat 3/206:05 am -
3 stops22h 14m
Deal found 9/26![Multiple Airlines logo]()
$1,837
This United Airlines deal was found by Cheapflights users on 9/24. 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 3/256:00 am -
2 stops21h 10m
Tue 4/611:25 am -
2 stops29h 44m
Deal found 9/24![United Airlines logo]()
$995
This United Airlines deal was found by Cheapflights users on 9/24. 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 11/88:00 am -
2 stops44h 20m
Sun 11/151:25 pm -
3 stops58h 40m
Deal found 9/24![United Airlines logo]()
$1,335
Last-minute flights from St. Louis to PortugalDiscover last-minute flight deals from St. Louis to Portugal. Data last updated September 26, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Portugal. Data last updated September 26, 2026 and is based on user searches.
This Travelocity deal was found by Cheapflights users on 9/22. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/125:27 pm -
2 stops36h 18m
Tue 11/104:40 pm -
2 stops31h 37m
Deal found 9/22![Iberia logo]()
$606
This Delta deal was found by Cheapflights users on 9/22. 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 10/127:00 am -
2 stops21h 30m
Tue 11/105:55 am -
2 stops24h 01m
Deal found 9/22![Delta logo]()
$660
This United Airlines deal was found by Cheapflights users on 9/23. 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 10/127:01 pm -
2 stops29h 59m
Wed 10/2111:20 am -
2 stops30h 02m
Deal found 9/23![United Airlines logo]()
$669
This Air Canada deal was found by Cheapflights users on 9/23. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1312:10 pm -
1 stop12h 50m
Wed 10/2111:20 am -
1 stop13h 21m
Deal found 9/23![Air Canada logo]()
$633
This United Airlines deal was found by Cheapflights users on 9/23. 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 10/1312:10 pm -
1 stop12h 50m
Wed 10/2111:20 am -
2 stops30h 02m
Deal found 9/23![United Airlines logo]()
$659
This United Airlines deal was found by Cheapflights users on 9/23. 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 10/1312:10 pm -
1 stop12h 50m
Thu 10/2211:50 am -
1 stop12h 51m
Deal found 9/23![United Airlines logo]()
$672
This United Airlines deal was found by Cheapflights users on 9/22. 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 10/219:30 am -
2 stops17h 50m
Wed 10/2811:55 am -
2 stops38h 45m
Deal found 9/22![United Airlines logo]()
$677
This United Airlines deal was found by Cheapflights users on 9/23. 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 10/2312:10 pm -
1 stop15h 10m
Fri 10/3012:20 pm -
2 stops27h 24m
Deal found 9/23![United Airlines logo]()
$715
This KAYAK deal was found by Cheapflights users on 9/23. 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 10/2711:29 am -
1 stop17h 01m
Fri 11/66:15 am -
2 stops21h 25m
Deal found 9/23![Lufthansa logo]()
$612
This Delta deal was found by Cheapflights users on 9/23. 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 10/277:00 am -
2 stops22h 35m
Fri 11/65:00 am -
2 stops21h 51m
Deal found 9/23![Delta logo]()
$617
This United Airlines deal was found by Cheapflights users on 9/23. 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 9/23![United Airlines logo]()
$631
This Air Canada deal was found by Cheapflights users on 9/25. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/284:05 pm -
1 stop11h 50m
Thu 11/55:00 am -
2 stops40h 26m
Deal found 9/25![Multiple Airlines logo]()
$735
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 September 26, 2026.
Search for one-way flight options from St. Louis to Portugal. Find affordable one-way fares based on user searches. Data last updated September 26, 2026.
This United Airlines deal was found by Cheapflights users on 9/24. 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 3/134:17 pm -
2 stops35h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![United Airlines logo]()
$349
This FlightHub deal was found by Cheapflights users on 9/22. 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.
Tue 1/1211:34 am -
2 stops28h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![British Airways logo]()
$361
This Air France deal was found by Cheapflights users on 9/22. 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.
Sun 1/39:52 am -
2 stops17h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Air France logo]()
$365
This oojo deal was found by Cheapflights users on 9/22. 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 1/33:40 pm -
1 stop25h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Lufthansa logo]()
$403
This Air Canada deal was found by Cheapflights users on 9/25. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/124:05 pm -
2 stops24h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Multiple Airlines logo]()
$405
This American Airlines deal was found by Cheapflights users on 9/21. 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.
Fri 3/1211:34 am -
2 stops18h 11m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![American Airlines logo]()
$406
This American Airlines deal was found by Cheapflights users on 9/23. 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.
Sun 1/36:14 am -
1 stop20h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![American Airlines logo]()
$440
This Justfly.com deal was found by Cheapflights users on 9/24. 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.
Fri 3/124:05 pm -
2 stops37h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Air Canada logo]()
$467
This Air Canada deal was found by Cheapflights users on 9/22. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2312:10 pm -
1 stop13h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Air Canada logo]()
$507
This Delta deal was found by Cheapflights users on 9/21. 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.
Sun 10/116:47 am -
2 stops19h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Delta logo]()
$539
This Kiwi.com deal was found by Cheapflights users on 9/21. 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 10/114:30 pm -
3 stops45h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Multiple Airlines logo]()
$605
This Air Canada deal was found by Cheapflights users on 9/25. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/131:08 pm -
3 stops18h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Air Canada logo]()
$667
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 September 26, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $579 (United Airlines) |
One-way from | $349 (United Airlines) |
Popular in | December |
Cheapest in | April |
Average price | $1,302 |
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 7,457,451 searches. Data last updated September 26, 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. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Sat 3/13
7:04 pm-9:30 am
2 stops32h 26m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$349
Quickest round-trip
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Tue 1/12
12:55 pm-9:05 am
1 stop14h 10m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$365
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Sun 1/3
9:52 am-8:55 am
2 stops17h 03m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$365
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Tue 1/12
11:45 am-8:10 am
1 stop14h 25m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$365
St. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Fri 3/12
4:05 pm-10:25 pm
2 stops24h 20m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$405
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Sun 1/3
6:14 am-9:05 am
1 stop20h 51m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$440
St. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Fri 3/12
4:05 pm-11:15 am
2 stops37h 10m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$467
St. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Fri 10/23
8:00 am-7:10 am
2 stops17h 10m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$511
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Sun 10/11
6:47 am-8:00 am
2 stops19h 13m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$539
St. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Sun 11/15
8:29 am-11:45 am
2 stops21h 16m
Porto
Mon 11/23
12:25 pm-9:31 am
2 stops27h 06m
$590
Showing 1-10 of 35 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-OPO
STL-FAO
STL-LIS
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-OPO
STL-FAO
STL-LIS
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 $2,505). 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 September 26, 2026.
Read through reviews of airlines operating flights from St. Louis to Portugal, such as United Airlines,Air Canada, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.1
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Crew
8.1
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Crew
8.1
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Crew
8.1
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Crew
8.1
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Crew
8.1
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
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
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Complete your trip
Complete your trip to Portugal by adding a car rental and/or hotel reservation to your travel itinerary.
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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 September 26, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 7,457,451 searches. Data last updated September 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$493 | Average$875 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$502 | Average$995 | 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$1,124 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$649 | Average$1,062 | FlexibilityNo cancel fee | On-time67% |