$354+ 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
Dec 10 — Dec 171
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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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Portugal
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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 November 10, 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 November 10, 2026.
This Gotogate deal was found by Cheapflights users on 11/7. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/74:05 pm -
1 stop11h 15m
Wed 12/235:00 am -
1 stop14h 45m
Deal found 11/7![Multiple Airlines logo]()
$731
This United deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:17 pm -
1 stop15h 03m
Fri 12/2511:20 am -
2 stops32h 58m
Deal found 11/5![Multiple Airlines logo]()
$764
This United Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:17 pm -
1 stop15h 03m
Fri 12/2510:15 am -
1 stop18h 44m
Deal found 11/5![United Airlines logo]()
$784
This United Airlines deal was found by Cheapflights users on 11/6. 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.
Fri 12/41:17 pm -
1 stop15h 03m
Fri 12/115:00 am -
1 stop14h 45m
Deal found 11/6![United Airlines logo]()
$812
This United Airlines deal was found by Cheapflights users on 11/9. 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 11/306:00 am -
1 stop20h 10m
Wed 3/35:00 am -
1 stop14h 45m
Deal found 11/9![United Airlines logo]()
$813
This United Airlines deal was found by Cheapflights users on 11/9. 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 12/110:50 am -
2 stops17h 30m
Wed 3/35:00 am -
1 stop14h 45m
Deal found 11/9![United Airlines logo]()
$817
This Air Canada deal was found by Cheapflights users on 11/9. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/296:50 pm -
2 stops33h 50m
Thu 3/48:55 am -
2 stops35h 22m
Deal found 11/9![Air Canada logo]()
$818
This United Airlines deal was found by Cheapflights users on 11/9. 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 11/305:00 pm -
1 stop33h 10m
Tue 3/211:20 am -
1 stop34h 06m
Deal found 11/9![United Airlines logo]()
$821
This Air Canada deal was found by Cheapflights users on 11/9. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/14:05 pm -
2 stops32h 50m
Fri 2/2610:55 am -
2 stops40h 28m
Deal found 11/9![Air Canada logo]()
$822
This Air Canada deal was found by Cheapflights users on 11/9. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/285:58 pm -
2 stops33h 22m
Thu 3/48:55 am -
2 stops35h 22m
Deal found 11/9![Air Canada logo]()
$823
This FlightHub deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/81:00 pm -
2 stops20h 20m
Mon 11/231:45 pm -
2 stops37h 55m
Deal found 11/5![Lufthansa logo]()
$832
This Justfly.com deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/78:15 pm -
2 stops38h 30m
Mon 11/238:40 pm -
2 stops29h 10m
Deal found 11/5![British Airways logo]()
$839
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 November 10, 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 November 10, 2026.
This United Airlines deal was found by Cheapflights users on 11/6. 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.
Tue 2/234:39 pm -
1 stop10h 51m
Fri 2/266:00 am -
1 stop13h 45m
Deal found 11/6![United Airlines logo]()
$719
This United deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:17 pm -
1 stop15h 03m
Fri 12/2511:20 am -
2 stops32h 58m
Deal found 11/5![Multiple Airlines logo]()
$764
This Expedia deal was found by Cheapflights users on 11/7. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/512:53 pm -
1 stop13h 22m
Wed 4/218:40 pm -
2 stops28h 50m
Deal found 11/7![Iberia logo]()
$778
This Delta deal was found by Cheapflights users on 11/9. 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.
Thu 4/15:45 pm -
2 stops18h 05m
Thu 4/85:00 am -
2 stops21h 49m
Deal found 11/9![Delta logo]()
$1,021
This Expedia deal was found by Cheapflights users on 11/9. 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 2/14:05 pm -
2 stops37h 10m
Sun 2/286:00 am -
1 stop13h 45m
Deal found 11/9![Multiple Airlines logo]()
$796
This United Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/106:00 am -
2 stops20h 10m
Fri 3/195:00 am -
2 stops21h 13m
Deal found 11/5![United Airlines logo]()
$806
This United Airlines deal was found by Cheapflights users on 11/7. 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 4/511:45 am -
1 stop16h 00m
Wed 4/2112:35 pm -
1 stop13h 05m
Deal found 11/7![United Airlines logo]()
$806
This United deal was found by Cheapflights users on 11/9. 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.
Mon 2/84:57 pm -
1 stop33h 13m
Sat 2/1311:20 am -
1 stop34h 06m
Deal found 11/9![Multiple Airlines logo]()
$850
This United Airlines deal was found by Cheapflights users on 11/7. 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.
Fri 1/2911:00 am -
1 stop15h 10m
Wed 2/35:00 am -
1 stop14h 45m
Deal found 11/7![United Airlines logo]()
$818
This United Airlines deal was found by Cheapflights users on 11/9. 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 2/17:29 am -
3 stops25h 56m
Sun 2/286:00 am -
2 stops19h 24m
Deal found 11/9![United Airlines logo]()
$839
This United Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/55:40 pm -
2 stops33h 40m
Sat 12/1212:25 pm -
1 stop31h 20m
Deal found 11/5![United Airlines logo]()
$851
This Air Canada deal was found by Cheapflights users on 11/7. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/54:10 pm -
2 stops24h 50m
Wed 4/2111:00 am -
3 stops17h 54m
Deal found 11/7![Multiple Airlines logo]()
$1,099
This United Airlines deal was found by Cheapflights users on 11/9. 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.
Sun 3/146:30 am -
1 stop20h 40m
Sat 3/2012:20 pm -
2 stops27h 22m
Deal found 11/9![United Airlines logo]()
$868
This United Airlines deal was found by Cheapflights users on 11/7. 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 11/215:34 pm -
2 stops33h 46m
Thu 12/312:20 pm -
1 stop13h 10m
Deal found 11/7![United Airlines logo]()
$1,023
This United Airlines deal was found by Cheapflights users on 11/6. 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.
Sat 3/135:20 pm -
1 stop10h 10m
Sat 3/2012:35 pm -
1 stop15h 23m
Deal found 11/6![United Airlines logo]()
$1,133
Last-minute flights from St. Louis to PortugalDiscover last-minute flight deals from St. Louis to Portugal. Data last updated November 10, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Portugal. Data last updated November 10, 2026 and is based on user searches.
This Justfly.com deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/78:15 pm -
2 stops38h 30m
Mon 11/238:40 pm -
2 stops29h 10m
Deal found 11/5![British Airways logo]()
$839
This FlightHub deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/81:00 pm -
2 stops20h 20m
Mon 11/231:45 pm -
2 stops37h 55m
Deal found 11/5![Lufthansa logo]()
$832
This Air Canada deal was found by Cheapflights users on 11/9. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/286:50 pm -
2 stops32h 30m
Fri 2/2610:55 am -
2 stops40h 28m
Deal found 11/9![Air Canada logo]()
$823
This Air Canada deal was found by Cheapflights users on 11/9. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/296:50 pm -
2 stops33h 50m
Thu 3/48:55 am -
2 stops35h 22m
Deal found 11/9![Air Canada logo]()
$818
This United Airlines deal was found by Cheapflights users on 11/9. 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 11/309:59 am -
1 stop16h 11m
Fri 2/265:00 am -
1 stop14h 45m
Deal found 11/9![United Airlines logo]()
$813
This United Airlines deal was found by Cheapflights users on 11/9. 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 11/305:00 pm -
1 stop33h 10m
Thu 3/411:20 am -
1 stop34h 06m
Deal found 11/9![United Airlines logo]()
$821
This United Airlines deal was found by Cheapflights users on 11/9. 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 12/110:50 am -
2 stops17h 30m
Wed 3/35:00 am -
1 stop14h 45m
Deal found 11/9![United Airlines logo]()
$817
This Air Canada deal was found by Cheapflights users on 11/9. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/14:05 pm -
2 stops32h 50m
Fri 2/2610:55 am -
2 stops40h 28m
Deal found 11/9![Air Canada logo]()
$822
This United Airlines deal was found by Cheapflights users on 11/6. 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.
Fri 12/41:18 pm -
2 stops12h 52m
Fri 12/115:00 am -
1 stop14h 45m
Deal found 11/6![United Airlines logo]()
$812
This Gotogate deal was found by Cheapflights users on 11/7. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/74:05 pm -
1 stop11h 15m
Wed 12/235:00 am -
1 stop14h 45m
Deal found 11/7![Multiple Airlines logo]()
$731
This United deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:17 pm -
1 stop15h 03m
Fri 12/2511:20 am -
2 stops32h 58m
Deal found 11/5![Multiple Airlines logo]()
$764
This United Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:17 pm -
1 stop15h 03m
Fri 12/2510:15 am -
1 stop18h 44m
Deal found 11/5![United Airlines logo]()
$784
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 November 10, 2026.
Search for one-way flight options from St. Louis to Portugal. Find affordable one-way fares based on user searches. Data last updated November 10, 2026.
This United Airlines deal was found by Cheapflights users on 11/9. 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.
Sat 3/135:34 pm -
2 stops33h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![United Airlines logo]()
$354
This Expedia deal was found by Cheapflights users on 11/9. 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.
Wed 2/1012:55 pm -
1 stop14h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![British Airways logo]()
$359
This FlightHub deal was found by Cheapflights users on 11/9. 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.
Mon 3/228:02 pm -
2 stops17h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![British Airways logo]()
$363
This FlightHub deal was found by Cheapflights users on 11/9. 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.
Fri 3/124:05 pm -
2 stops37h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Multiple Airlines logo]()
$409
This Cheapflightsfares deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/49:40 pm -
1 stop19h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![British Airways logo]()
$435
This Justfly.com deal was found by Cheapflights users on 11/6. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/47:30 am -
2 stops19h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/6![Air Canada logo]()
$442
This United Airlines deal was found by Cheapflights users on 11/7. 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.
Sun 4/46:30 am -
2 stops20h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/7![United Airlines logo]()
$447
This Booking.com deal was found by Cheapflights users on 11/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/195:23 pm -
2 stops24h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/6![British Airways logo]()
$451
This Kiwi.com deal was found by Cheapflights users on 11/9. 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 2/103:40 pm -
3 stops34h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Multiple Airlines logo]()
$486
This Justfly.com deal was found by Cheapflights users on 11/7. 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.
Tue 1/122:11 pm -
2 stops37h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/7![Aer Lingus logo]()
$492
This United Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/126:30 am -
1 stop21h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![United Airlines logo]()
$522
This AranGrant deal was found by Cheapflights users on 11/8. 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 AranGrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/28:15 am -
2 stops21h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/8![Brussels Airlines logo]()
$1,090
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 November 10, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $710 (Gotogate) |
One-way from | $354 (United Airlines) |
Popular in | December |
Cheapest in | April |
Average price | $967 |
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 November 10, 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
5:34 pm-9:30 am
2 stops33h 56m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$354
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Wed 2/10
11:53 am-12:05 pm
2 stops18h 12m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$359
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Mon 3/22
12:53 pm-9:05 am
1 stop15h 12m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$370
St. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Fri 3/12
6:30 am-9:30 am
1 stop21h 00m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$387
St. LouisPorto
STL Lambert-St Louis - OPO Porto
STLOPO
Lambert-St Louis
Fri 3/12
4:05 pm-11:40 am
2 stops37h 35m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$409
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Sun 4/4
9:40 pm-11:05 pm
1 stop19h 25m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$435
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Sun 4/4
9:23 am-9:20 am
2 stops17h 57m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$446
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Sun 4/4
6:30 am-9:20 am
2 stops20h 50m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$447
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Fri 3/19
5:23 pm-10:30 pm
2 stops24h 07m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$451
Quickest round-trip
St. LouisLisbon
STL Lambert-St Louis - LIS Lisbon Humberto Delgado
STLLIS
Lambert-St Louis
Sun 1/3
3:40 pm-11:35 am
1 stop13h 55m
Lisbon Humberto Delgado
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$540
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 $2,507). 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 November 10, 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.
Overall
7.3
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Food
6.7
Crew
8.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Overall
7.3
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Food
6.7
Crew
8.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Overall
7.3
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Food
6.7
Crew
8.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Overall
7.3
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Food
6.7
Crew
8.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Overall
7.3
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Food
6.7
Crew
8.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Overall
7.3
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Food
6.7
Crew
8.1
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
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 November 10, 2026.
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St. Louis to Portugal flights
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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 November 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$493 | Average$884 | 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$735 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$588 | Average$1,129 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$649 | Average$1,062 | FlexibilityNo cancel fee | On-time67% |