$237+ Cheap flights from Seattle (SEA) 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 11/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
Jul 16 — Jul 231
Round-trip
1 adult, Economy
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Cheapest flights from Seattle to PortugalExplore the most affordable flight options available from Seattle to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 16, 2026.
Explore the most affordable flight options available from Seattle to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 16, 2026.
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:05 pm
SEA
- OPO
2 stops18h 45m
Multiple Airlines
Tue 10/205:45 pm
OPO
- SEA
2 stops29h 55m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$676
This Mytrip deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/58:00 am
SEA
- OPO
3 stops32h 40m
Multiple Airlines
Sat 9/127:10 pm
OPO
- SEA
3 stops31h 22m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$693
This Mytrip deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/75:40 pm
SEA
- LIS
2 stops19h 20m
Multiple Airlines
Wed 10/212:00 pm
LIS
- SEA
3 stops34h 00m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$707
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/33:40 pm
SEA
- LIS
2 stops24h 00m
Multiple Airlines
Tue 9/86:15 am
LIS
- SEA
3 stops35h 25m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$718
This Mytrip deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:00 pm
SEA
- LIS
2 stops20h 40m
Multiple Airlines
Tue 9/86:15 am
LIS
- SEA
2 stops35h 25m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$724
This Mytrip deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/73:40 pm
SEA
- LIS
2 stops20h 20m
Multiple Airlines
Tue 9/227:00 am
LIS
- SEA
3 stops43h 45m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$741
This Mytrip deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/293:40 pm
SEA
- LIS
2 stops19h 05m
Multiple Airlines
Sun 9/67:00 am
LIS
- SEA
3 stops46h 00m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$747
This Mytrip deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/115:40 pm
SEA
- LIS
2 stops17h 50m
Multiple Airlines
Tue 10/205:00 pm
LIS
- SEA
2 stops30h 40m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$756
This Mytrip deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/33:40 pm
SEA
- OPO
3 stops34h 20m
Multiple Airlines
Sun 9/65:55 am
OPO
- SEA
3 stops47h 05m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$757
This Mytrip deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/97:00 am
SEA
- LIS
2 stops30h 45m
WestJet
Mon 8/246:15 am
LIS
- SEA
2 stops35h 25m
WestJet
Deal found 6/15![WestJet logo]()
$765
This Travelocity deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:50 pm
SEA
- OPO
2 stops17h 10m
Iberia
Mon 11/239:55 pm
OPO
- SEA
2 stops27h 00m
Iberia
Deal found 6/15![Iberia logo]()
$773
This Mytrip deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/115:40 pm
SEA
- OPO
3 stops31h 20m
Multiple Airlines
Wed 10/215:25 pm
OPO
- SEA
2 stops30h 35m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$794
Best flights from Seattle to PortugalDiscover carefully curated flight deals from Seattle to Portugal that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 16, 2026.
Discover carefully curated flight deals from Seattle to Portugal that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 16, 2026.
This United Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:50 am
SEA
- OPO
1 stop18h 40m
United Airlines
Tue 11/1012:35 pm
OPO
- SEA
2 stops29h 25m
United Airlines
Deal found 6/16![United Airlines logo]()
$811
This KLM deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/92:35 pm
SEA
- FNC
1 stop35h 00m
KLM
Thu 11/1211:45 am
FNC
- SEA
1 stop32h 02m
KLM
Deal found 6/15![KLM logo]()
$830
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2311:45 am
SEA
- OPO
2 stops19h 40m
Delta
Thu 10/15:55 am
OPO
- SEA
1 stop19h 52m
Delta
Deal found 6/13![Delta logo]()
$848
This British Airways deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/97:23 am
SEA
- FNC
2 stops22h 52m
British Airways
Thu 11/125:00 pm
FNC
- SEA
2 stops38h 18m
British Airways
Deal found 6/15![British Airways logo]()
$904
This SWISS deal was found by Cheapflights users on 6/11. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2410:42 am
SEA
- OPO
2 stops23h 48m
SWISS
Tue 10/1312:15 pm
OPO
- SEA
2 stops38h 17m
SWISS
Deal found 6/11![SWISS logo]()
$907
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/183:40 pm
SEA
- FAO
3 stops22h 55m
Multiple Airlines
Sat 9/266:20 am
FAO
- SEA
2 stops22h 20m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$1,013
This KAYAK deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/610:45 am
SEA
- PDL
2 stops14h 35m
Lufthansa
Mon 8/1711:00 am
PDL
- SEA
1 stop19h 44m
Lufthansa
Deal found 6/12![Lufthansa logo]()
$1,303
This Turkish Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:05 pm
SEA
- TER
2 stops56h 55m
Turkish Airlines
Sun 12/611:50 am
TER
- SEA
2 stops36h 20m
Turkish Airlines
Deal found 6/15![Turkish Airlines logo]()
$1,567
This United Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/88:00 am
SEA
- LIS
1 stop18h 15m
United Airlines
Wed 11/185:00 am
LIS
- SEA
1 stop15h 00m
United Airlines
Deal found 6/16![United Airlines logo]()
$823
This KLM deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/301:50 pm
SEA
- OPO
1 stop17h 40m
KLM
Mon 10/127:55 pm
OPO
- SEA
1 stop23h 57m
KLM
Deal found 6/14![KLM logo]()
$841
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/206:45 pm
SEA
- OPO
1 stop19h 15m
Delta
Sun 9/2711:45 am
OPO
- SEA
1 stop32h 02m
Delta
Deal found 6/13![Delta logo]()
$896
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Tue 9/227:30 am
SEA
- OPO
1 stop18h 15m
United Airlines
Tue 10/1312:15 pm
OPO
- SEA
2 stops35h 51m
United Airlines
Deal found 6/11![United Airlines logo]()
$834
This Delta deal was found by Cheapflights users on 6/11. 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.
Thu 9/246:45 pm
SEA
- OPO
1 stop19h 15m
Delta
Tue 10/1311:35 am
OPO
- SEA
1 stop32h 17m
Delta
Deal found 6/11![Delta logo]()
$896
This KLM deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:45 pm
SEA
- LIS
1 stop17h 00m
KLM
Mon 9/287:45 pm
LIS
- SEA
1 stop24h 02m
KLM
Deal found 6/14![KLM logo]()
$923
This Mytrip deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/167:00 pm
SEA
- FAO
3 stops31h 25m
Multiple Airlines
Wed 10/216:10 pm
FAO
- SEA
2 stops34h 54m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$1,026
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/811:00 pm
SEA
- OPO
1 stop23h 55m
United Airlines
Tue 8/2512:05 pm
OPO
- SEA
1 stop31h 50m
United Airlines
Deal found 6/12![United Airlines logo]()
$856
This British Airways deal was found by Cheapflights users on 6/11. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/208:20 pm
SEA
- FAO
1 stop30h 00m
British Airways
Thu 9/247:55 pm
FAO
- SEA
1 stop30h 30m
British Airways
Deal found 6/11![British Airways logo]()
$1,066
This Delta deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/76:40 pm
SEA
- OPO
1 stop19h 25m
Delta
Wed 8/195:00 am
OPO
- SEA
2 stops19h 13m
Delta
Deal found 6/14![Delta logo]()
$907
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/178:30 am
SEA
- LIS
2 stops15h 40m
United Airlines
Tue 12/111:20 am
LIS
- SEA
3 stops42h 36m
United Airlines
Deal found 6/14![United Airlines logo]()
$872
This KLM deal was found by Cheapflights users on 6/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/141:50 pm
SEA
- FAO
1 stop19h 35m
KLM
Mon 9/219:45 pm
FAO
- SEA
1 stop22h 02m
KLM
Deal found 6/11![KLM logo]()
$971
This Delta deal was found by Cheapflights users on 6/11. 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.
Fri 11/202:05 pm
SEA
- LIS
1 stop17h 05m
Delta
Wed 12/211:30 am
LIS
- SEA
1 stop32h 20m
Delta
Deal found 6/11![Delta logo]()
$931
This KLM deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/85:45 pm
SEA
- FAO
1 stop17h 45m
KLM
Tue 9/1510:00 am
FAO
- SEA
1 stop33h 47m
KLM
Deal found 6/13![KLM logo]()
$971
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/87:00 pm
SEA
- FNC
3 stops28h 50m
Multiple Airlines
Wed 7/157:00 pm
FNC
- SEA
3 stops46h 40m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$1,200
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/308:10 am
SEA
- LIS
1 stop18h 20m
United Airlines
Tue 10/135:05 am
LIS
- SEA
1 stop15h 15m
United Airlines
Deal found 6/15![United Airlines logo]()
$918
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:45 pm
SEA
- OPO
1 stop19h 15m
Delta
Sat 10/105:00 am
OPO
- SEA
1 stop14h 52m
Delta
Deal found 6/13![Delta logo]()
$956
This Ovago deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1310:45 am
SEA
- FNC
2 stops38h 25m
SWISS
Thu 8/2010:25 am
FNC
- SEA
2 stops42h 18m
SWISS
Deal found 6/15![SWISS logo]()
$1,403
This KLM deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/112:35 pm
SEA
- FAO
1 stop15h 15m
KLM
Mon 11/302:40 pm
FAO
- SEA
1 stop29h 10m
KLM
Deal found 6/14![KLM logo]()
$985
This Mytrip deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/67:35 pm
SEA
- PDL
2 stops31h 00m
Multiple Airlines
Mon 8/177:40 pm
PDL
- SEA
3 stops34h 02m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$1,203
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/158:10 am
SEA
- LIS
1 stop18h 20m
United Airlines
Fri 10/25:05 am
LIS
- SEA
1 stop15h 15m
United Airlines
Deal found 6/12![United Airlines logo]()
$946
This Delta deal was found by Cheapflights users on 6/11. 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.
Mon 8/177:16 am
SEA
- LIS
2 stops19h 29m
Delta
Tue 9/111:55 am
LIS
- SEA
1 stop31h 52m
Delta
Deal found 6/11![Delta logo]()
$979
Last-minute flights from Seattle to PortugalDiscover last-minute flight deals from Seattle to Portugal. Data last updated June 16, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Portugal. Data last updated June 16, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/211:25 pm
SEA
- OPO
3 stops24h 35m
Multiple Airlines
Tue 7/145:45 pm
OPO
- SEA
2 stops26h 00m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$882
This Mytrip deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/143:40 pm
SEA
- LIS
2 stops20h 55m
Multiple Airlines
Tue 7/219:15 pm
LIS
- SEA
3 stops31h 25m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$903
This Mytrip deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/1410:30 am
SEA
- LIS
3 stops27h 15m
WestJet
Tue 7/216:15 am
LIS
- SEA
3 stops35h 25m
WestJet
Deal found 6/15![WestJet logo]()
$931
This oojo deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/156:50 pm
SEA
- OPO
1 stop20h 35m
Lufthansa
Tue 7/286:20 am
OPO
- SEA
1 stop18h 39m
Lufthansa
Deal found 6/12![Lufthansa logo]()
$899
This Justfly.com deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/1510:45 am
SEA
- OPO
2 stops28h 10m
Multiple Airlines
Tue 7/288:40 am
OPO
- SEA
2 stops17h 52m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$908
This FlightHub deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/155:45 am
SEA
- OPO
2 stops17h 15m
Air Canada
Tue 7/2812:15 pm
OPO
- SEA
2 stops18h 27m
Air Canada
Deal found 6/13![Air Canada logo]()
$911
This Gotogate deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/155:45 am
SEA
- OPO
2 stops17h 15m
Multiple Airlines
Mon 7/2012:10 pm
OPO
- SEA
1 stop32h 10m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$914
This Mytrip deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/167:00 am
SEA
- LIS
3 stops31h 35m
WestJet
Thu 7/236:10 am
LIS
- SEA
2 stops35h 30m
WestJet
Deal found 6/15![WestJet logo]()
$786
This Mytrip deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/163:40 pm
SEA
- LIS
3 stops31h 10m
Multiple Airlines
Thu 7/236:10 am
LIS
- SEA
3 stops35h 30m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$869
This Justfly.com deal was found by Cheapflights users on 6/11. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/203:00 pm
SEA
- OPO
2 stops32h 00m
Lufthansa
Wed 8/56:20 am
OPO
- SEA
1 stop18h 39m
Lufthansa
Deal found 6/11![Lufthansa logo]()
$894
This Gotogate deal was found by Cheapflights users on 6/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/207:20 pm
SEA
- OPO
2 stops27h 40m
Multiple Airlines
Wed 8/511:20 am
OPO
- SEA
2 stops17h 47m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$906
This Flighttix deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/295:45 am
SEA
- OPO
2 stops17h 15m
Multiple Airlines
Wed 8/56:20 am
OPO
- SEA
1 stop18h 39m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$881
One-way flights from Seattle to PortugalSearch for one-way flight options from Seattle to Portugal. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
Search for one-way flight options from Seattle to Portugal. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
This Travelocity deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/257:55 am
SEA
- LIS
2 stops18h 15m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$237
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:00 am
SEA
- LIS
3 stops30h 15m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$241
This Trip.com deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/22:35 pm
SEA
- LIS
2 stops19h 10m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$276
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:00 am
SEA
- LIS
3 stops22h 30m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$303
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/67:00 pm
SEA
- LIS
3 stops42h 10m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$312
This Kiwi.com deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1011:25 pm
SEA
- OPO
2 stops40h 00m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$316
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:00 am
SEA
- LIS
3 stops22h 10m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:00 pm
SEA
- OPO
2 stops20h 25m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$323
This Trip.com deal was found by Cheapflights users on 6/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/77:35 pm
SEA
- LIS
2 stops18h 10m
WestJet
Deal found 6/11![WestJet logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1211:25 pm
SEA
- OPO
3 stops37h 45m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$327
This Kiwi.com deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/227:52 am
SEA
- OPO
3 stops42h 18m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/71:30 pm
SEA
- FNC
3 stops51h 25m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$372
Find flight deals from Seattle to Portugal
Keep the following information in mind while searching for Seattle to Portugal flight deals. Data was last updated June 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $676 (Mytrip) |
One-way from | $237 (Travelocity) |
Popular in | June |
Cheapest in | January |
Average price | $1,235 |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle 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 June 16, 2026.
Use the filters below to find and compare flights from Seattle to Portugal that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Tue 11/3
6:50 am-9:30 am
1 stop18h 40m
Porto
Tue 11/10
12:35 pm-10:00 am
2 stops29h 25m
$811
Quickest round-trip
SeattleLisbon
SEA - LIS
SEALIS
Seattle/Tacoma Intl
Sun 11/8
8:00 am-10:15 am
1 stop18h 15m
Lisbon Humberto Delgado
Wed 11/18
5:00 am-12:00 pm
1 stop15h 00m
$823
SeattleFunchal
SEA - FNC
SEAFNC
Seattle/Tacoma Intl
Mon 11/9
2:35 pm-9:35 am
1 stop35h 00m
Funchal Madeira
Thu 11/12
11:45 am-11:47 am
1 stop32h 02m
$830
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Tue 9/22
7:30 am-9:45 am
1 stop18h 15m
Porto
Tue 10/13
12:15 pm-4:06 pm
2 stops35h 51m
$834
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Wed 9/30
1:50 pm-3:30 pm
1 stop17h 40m
Porto
Mon 10/12
7:55 pm-11:52 am
1 stop23h 57m
$841
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Wed 9/23
11:45 am-3:25 pm
2 stops19h 40m
Porto
Thu 10/1
5:55 am-5:47 pm
1 stop19h 52m
$848
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Sat 8/8
11:00 pm-6:55 am
1 stop23h 55m
Porto
Tue 8/25
12:05 pm-11:55 am
1 stop31h 50m
$856
SeattleLisbon
SEA - LIS
SEALIS
Seattle/Tacoma Intl
Tue 11/17
8:30 am-8:10 am
2 stops15h 40m
Lisbon Humberto Delgado
Tue 12/1
11:20 am-9:56 pm
3 stops42h 36m
$872
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Sun 9/20
6:45 pm-10:00 pm
1 stop19h 15m
Porto
Sun 9/27
11:45 am-11:47 am
1 stop32h 02m
$896
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Thu 9/24
6:45 pm-10:00 pm
1 stop19h 15m
Porto
Tue 10/13
11:35 am-11:52 am
1 stop32h 17m
$896
Showing 1-10 of 57 resultsSorted by cheapest first
Best time to book a flight from Seattle to Portugal
Have a flexible travel schedule? Discover the best time to fly to Portugal from Seattle with our price prediction graph.
SEA-LIS
SEA-OPO
SEA-FNC
SEA-FAO
SEA-PDL
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 Seattle to Portugal
SEA-PT0
SEA-LIS
SEA-OPO
SEA-FNC
SEA-FAO
What is the cheapest month to book a flight from Seattle to Portugal?
Currently, January is the cheapest month in which you can book a flight from Seattle to Portugal (average of $339). Flying from Seattle to Portugal in June is currently the most expensive (average of $744). 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 Seattle to Portugal?
To ensure you get the cheapest price possible for a flight from Seattle to Portugal, you should look to book at least 79 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
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 June 16, 2026.
Get a feel of what it's like to fly with Delta,KLM, andUnited Airlines from Seattle to Portugal by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Entertainment
7.8
Overall
7.9
Comfort
7.8
Food
7.2
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Overall
7.9
Comfort
7.8
Food
7.2
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Overall
7.9
Comfort
7.8
Food
7.2
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Overall
7.9
Comfort
7.8
Food
7.2
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Overall
7.9
Comfort
7.8
Food
7.2
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Overall
7.9
Comfort
7.8
Food
7.2
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Related info for your journey
Find useful and relevant information for your journey from Seattle to Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Seattle 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 Seattle to Portugal by cabin class
Find flights from Seattle to Portugal, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Seattle and Portugal flights
Browse other Seattle and Portugal flight options. Last updated on June 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Seattle to Portugal flights
Consider these flights traveling from Seattle to Portugal.
Fly to Portugal regions
Consider these flights traveling to Portugal regions.
Top 10 airlines flying from Seattle to Portugal
Discover the top 10 airlines that operate flights from Seattle 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 June 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$348 | Average$434 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$482 | Average$1,168 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$482 | Average$838 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$482 | Average$837 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$488 | Average$1,172 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$497 | Average$1,042 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$504 | Average$970 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$535 | Average$893 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$543 | Average$948 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$545 | Average$1,006 | FlexibilityNo cancel fee | On-timeN/A |