$263+ 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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA ā LIS
Aug 28 ā Sep 41
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Seattle 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 āFind dealsā2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each providerās pricing and select the best option for you! Book through your favorite providerās website for a seamless experience.Cheap flight deals from Seattle to Portugal
Cheapest
Best
Last-minute
One-way
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 July 29, 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 July 29, 2026.
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/268:00 am
SEA
- LIS
2 stops26h 35m
Multiple Airlines
Wed 9/96:45 pm
LIS
- SEA
3 stops34h 19m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$691
This Expedia deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Expedia is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 10/283:50 pm
SEA
- LIS
1 stop24h 40m
Lufthansa
Wed 11/115:00 am
LIS
- SEA
1 stop15h 00m
Lufthansa
Deal found 7/29![Lufthansa logo]()
$723
This Expedia deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Expedia is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 10/288:40 am
SEA
- LIS
2 stops17h 15m
Multiple Airlines
Wed 11/115:00 am
LIS
- SEA
1 stop15h 00m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$724
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 10/215:40 am
SEA
- LIS
2 stops19h 40m
Multiple Airlines
Wed 11/45:00 am
LIS
- SEA
1 stop15h 00m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$732
This Gotogate deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Gotogate is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 10/288:40 am
SEA
- LIS
2 stops15h 15m
Multiple Airlines
Thu 11/55:00 am
LIS
- SEA
1 stop15h 00m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$733
This oojo deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure oojo is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 11/42:50 pm
SEA
- LIS
1 stop14h 40m
Lufthansa
Wed 11/185:00 am
LIS
- SEA
1 stop15h 00m
Lufthansa
Deal found 7/29![Lufthansa logo]()
$734
This Expedia deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Expedia is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 12/87:45 am
SEA
- LIS
1 stop17h 35m
Multiple Airlines
Tue 12/152:20 pm
LIS
- SEA
1 stop30h 40m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$736
This oojo deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure oojo is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sun 11/82:50 pm
SEA
- LIS
1 stop14h 30m
Lufthansa
Wed 11/185:00 am
LIS
- SEA
1 stop15h 00m
Lufthansa
Deal found 7/26![Lufthansa logo]()
$738
This Expedia deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Expedia is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 11/26:50 pm
SEA
- OPO
2 stops17h 10m
Iberia
Wed 11/114:40 pm
OPO
- SEA
2 stops26h 32m
Iberia
Deal found 7/28![Iberia logo]()
$739
This oojo deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure oojo is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 10/283:50 pm
SEA
- LIS
1 stop14h 30m
Lufthansa
Fri 11/66:10 am
LIS
- SEA
1 stop14h 50m
Lufthansa
Deal found 7/24![Lufthansa logo]()
$740
This KLM deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure KLM is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sun 11/2210:50 pm
SEA
- FNC
2 stops50h 45m
KLM
Wed 12/210:25 am
FNC
- SEA
1 stop33h 25m
KLM
Deal found 7/28![KLM logo]()
$759
This American Airlines deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 11/26:45 pm
SEA
- OPO
2 stops17h 15m
Multiple Airlines
Wed 11/118:40 pm
OPO
- SEA
2 stops20h 57m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$767
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 July 29, 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 July 29, 2026.
This United deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 1/512:46 pm
SEA
- LIS
3 stops34h 09m
Multiple Airlines
Wed 1/136:00 am
LIS
- SEA
1 stop15h 00m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$749
This Delta deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 12/143:25 pm
SEA
- LIS
1 stop15h 45m
Delta
Fri 12/255:30 am
LIS
- SEA
1 stop17h 43m
Delta
Deal found 7/29![Delta logo]()
$781
This KLM deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure KLM is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 11/1110:50 pm
SEA
- FNC
2 stops34h 20m
KLM
Wed 11/1810:25 am
FNC
- SEA
1 stop33h 22m
KLM
Deal found 7/28![KLM logo]()
$809
This Turkish Airlines deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Turkish Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/157:15 pm
SEA
- OPO
1 stop30h 45m
Turkish Airlines
Thu 10/111:00 am
OPO
- SEA
1 stop38h 20m
Turkish Airlines
Deal found 7/26![Turkish Airlines logo]()
$842
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/175:13 pm
SEA
- PDL
2 stops32h 07m
United Airlines
Tue 9/111:00 am
PDL
- SEA
2 stops31h 34m
United Airlines
Deal found 7/28![United Airlines logo]()
$842
This Iberia deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Iberia is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 10/105:00 am
SEA
- FNC
2 stops47h 40m
Iberia
Wed 10/211:35 pm
FNC
- SEA
2 stops38h 40m
Iberia
Deal found 7/29![Iberia logo]()
$995
This oojo deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure oojo is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 10/102:10 pm
SEA
- FNC
1 stop17h 55m
Lufthansa
Wed 10/215:10 pm
FNC
- SEA
1 stop27h 10m
Lufthansa
Deal found 7/26![Lufthansa logo]()
$1,148
This Delta deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/237:15 am
SEA
- LIS
2 stops23h 40m
Delta
Fri 10/25:00 am
LIS
- SEA
1 stop19h 35m
Delta
Deal found 7/28![Delta logo]()
$813
This Air France deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Air France is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/221:30 pm
SEA
- OPO
1 stop17h 55m
Multiple Airlines
Tue 9/295:00 am
OPO
- SEA
1 stop19h 35m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$835
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 12/2811:49 pm
SEA
- OPO
2 stops25h 41m
United Airlines
Tue 1/56:00 am
OPO
- SEA
2 stops39h 00m
United Airlines
Deal found 7/28![United Airlines logo]()
$872
This KLM deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure KLM is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 11/1111:15 am
SEA
- FAO
2 stops18h 35m
KLM
Mon 11/302:40 pm
FAO
- SEA
1 stop29h 10m
KLM
Deal found 7/25![KLM logo]()
$897
This Delta deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/222:30 pm
SEA
- LIS
2 stops19h 20m
Delta
Fri 10/25:00 am
LIS
- SEA
2 stops19h 44m
Delta
Deal found 7/29![Delta logo]()
$819
This Turkish Airlines deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Turkish Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 9/267:15 pm
SEA
- OPO
1 stop36h 35m
Turkish Airlines
Sat 10/2410:45 am
OPO
- SEA
1 stop39h 25m
Turkish Airlines
Deal found 7/27![Turkish Airlines logo]()
$942
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 9/246:50 pm
SEA
- LIS
1 stop19h 55m
United Airlines
Tue 10/65:05 am
LIS
- SEA
2 stops17h 17m
United Airlines
Deal found 7/28![United Airlines logo]()
$872
This Delta deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 10/76:40 pm
SEA
- OPO
1 stop19h 20m
Delta
Thu 10/155:00 am
OPO
- SEA
1 stop19h 35m
Delta
Deal found 7/25![Delta logo]()
$840
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/1011:49 pm
SEA
- FNC
2 stops24h 16m
United Airlines
Wed 8/269:40 am
FNC
- SEA
1 stop22h 04m
United Airlines
Deal found 7/25![United Airlines logo]()
$885
This Mytrip deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 9/183:40 pm
SEA
- LIS
2 stops21h 40m
Multiple Airlines
Mon 9/216:25 pm
LIS
- SEA
2 stops27h 57m
Multiple Airlines
Deal found 7/24![Multiple Airlines logo]()
$979
This KLM deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure KLM is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 10/105:45 pm
SEA
- FAO
1 stop16h 20m
KLM
Wed 10/218:20 pm
FAO
- SEA
1 stop23h 32m
KLM
Deal found 7/27![KLM logo]()
$983
This Delta deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/236:45 pm
SEA
- OPO
1 stop19h 15m
Delta
Wed 10/75:00 am
OPO
- SEA
1 stop14h 52m
Delta
Deal found 7/25![Delta logo]()
$840
This Turkish Airlines deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Turkish Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 9/187:15 pm
SEA
- LIS
1 stop36h 35m
Turkish Airlines
Mon 9/2810:55 am
LIS
- SEA
1 stop38h 25m
Turkish Airlines
Deal found 7/25![Turkish Airlines logo]()
$1,021
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 9/2610:48 pm
SEA
- OPO
2 stops48h 12m
United Airlines
Sat 10/2411:20 am
OPO
- SEA
2 stops39h 43m
United Airlines
Deal found 7/27![United Airlines logo]()
$902
This FlightHub deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure FlightHub is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/293:29 pm
SEA
- PDL
1 stop31h 51m
Multiple Airlines
Mon 10/55:30 pm
PDL
- SEA
1 stop24h 05m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$1,011
This KLM deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure KLM is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sun 9/135:45 pm
SEA
- FAO
1 stop31h 25m
KLM
Sun 9/279:20 am
FAO
- SEA
1 stop15h 15m
KLM
Deal found 7/25![KLM logo]()
$1,035
This Delta deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/237:15 am
SEA
- LIS
2 stops23h 40m
Delta
Sun 10/411:55 am
LIS
- SEA
1 stop36h 40m
Delta
Deal found 7/28![Delta logo]()
$873
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/251:00 pm
SEA
- PDL
1 stop12h 40m
United Airlines
Tue 9/111:00 am
PDL
- SEA
1 stop14h 41m
United Airlines
Deal found 7/26![United Airlines logo]()
$906
This KLM deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure KLM is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 9/111:50 pm
SEA
- FAO
1 stop23h 15m
KLM
Fri 9/188:50 am
FAO
- SEA
1 stop15h 45m
KLM
Deal found 7/28![KLM logo]()
$1,044
This KAYAK deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure KAYAK is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 9/148:10 am
SEA
- FAO
2 stops19h 10m
Multiple Airlines
Mon 9/219:10 am
FAO
- SEA
2 stops45h 35m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$1,046
This Delta deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/97:15 am
SEA
- OPO
2 stops19h 25m
Delta
Fri 9/255:00 am
OPO
- SEA
2 stops19h 30m
Delta
Deal found 7/27![Delta logo]()
$925
This Mytrip deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 10/37:35 pm
SEA
- PDL
3 stops35h 40m
Multiple Airlines
Thu 10/156:15 pm
PDL
- SEA
3 stops31h 30m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$1,059
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/911:04 pm
SEA
- OPO
2 stops26h 41m
United Airlines
Wed 9/1611:20 am
OPO
- SEA
2 stops36h 47m
United Airlines
Deal found 7/26![United Airlines logo]()
$978
Last-minute flights from Seattle to PortugalDiscover last-minute flight deals from Seattle to Portugal. Data last updated July 29, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Portugal. Data last updated July 29, 2026 and is based on user searches.
This Gotogate deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Gotogate is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 8/811:25 pm
SEA
- LIS
1 stop13h 55m
Icelandair
Sun 8/2310:20 pm
LIS
- SEA
1 stop21h 25m
Icelandair
Deal found 7/25![Icelandair logo]()
$864
This Flysmarter deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Flysmarter is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/177:20 pm
SEA
- PDL
2 stops30h 00m
Air Canada
Tue 9/111:00 am
PDL
- SEA
1 stop14h 41m
Air Canada
Deal found 7/28![Air Canada logo]()
$827
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/175:13 pm
SEA
- PDL
2 stops32h 07m
United Airlines
Tue 9/111:00 am
PDL
- SEA
3 stops31h 25m
United Airlines
Deal found 7/28![United Airlines logo]()
$842
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/198:00 am
SEA
- OPO
3 stops32h 40m
Multiple Airlines
Mon 8/247:10 pm
OPO
- SEA
3 stops33h 57m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$787
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/198:00 am
SEA
- LIS
2 stops26h 35m
Multiple Airlines
Mon 8/245:55 pm
LIS
- SEA
3 stops35h 12m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$800
This Mytrip deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/245:50 am
SEA
- LIS
3 stops32h 20m
Multiple Airlines
Mon 8/315:55 pm
LIS
- SEA
3 stops35h 12m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$773
This Mytrip deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/248:00 am
SEA
- OPO
2 stops23h 40m
Multiple Airlines
Mon 8/317:10 pm
OPO
- SEA
3 stops33h 57m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$806
This Mytrip deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/253:40 pm
SEA
- LIS
2 stops21h 55m
Multiple Airlines
Tue 9/19:35 am
LIS
- SEA
2 stops34h 10m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$847
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/268:00 am
SEA
- LIS
2 stops26h 35m
Multiple Airlines
Wed 9/96:45 pm
LIS
- SEA
3 stops34h 19m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$691
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/267:00 pm
SEA
- OPO
3 stops28h 35m
Multiple Airlines
Tue 9/16:00 pm
OPO
- SEA
3 stops34h 40m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$820
This Mytrip deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Mytrip is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 8/283:40 pm
SEA
- OPO
2 stops23h 45m
Multiple Airlines
Fri 9/45:05 am
OPO
- SEA
3 stops23h 35m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$864
This Turkish Airlines deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Turkish Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sun 8/307:15 pm
SEA
- OPO
1 stop30h 25m
Turkish Airlines
Wed 9/3010:45 am
OPO
- SEA
1 stop38h 35m
Turkish Airlines
Deal found 7/25![Turkish Airlines logo]()
$842
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 July 29, 2026.
Search for one-way flight options from Seattle to Portugal. Find affordable one-way fares based on user searches. Data last updated July 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 10/68:00 am
SEA
- LIS
3 stops30h 30m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$263
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 10/163:40 pm
SEA
- LIS
3 stops47h 50m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$268
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 10/157:00 pm
SEA
- FAO
3 stops44h 30m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 10/293:35 pm
SEA
- OPO
3 stops46h 40m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 10/303:35 pm
SEA
- OPO
3 stops22h 40m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 10/157:00 pm
SEA
- LIS
3 stops44h 25m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 8/87:00 am
SEA
- LIS
2 stops29h 55m
WestJet
Deal found 7/25![WestJet logo]()
$301
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/137:00 am
SEA
- LIS
2 stops31h 35m
WestJet
Deal found 7/25![WestJet logo]()
$305
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 11/98:18 am
SEA
- LIS
3 stops40h 32m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$306
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 10/97:00 pm
SEA
- LIS
3 stops44h 30m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$308
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 10/23:40 pm
SEA
- LIS
2 stops33h 55m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$309
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 10/107:00 pm
SEA
- LIS
3 stops45h 10m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$316
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 July 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $691 (Mytrip) |
One-way from | $263 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $1,205 |
Cheapflights Fare Finder
Ā
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 July 29, 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
SeattleLisbon
SEA - LIS
SEALIS
Seattle/Tacoma Intl
Tue 1/5
12:46 pm-6:55 am
3 stops34h 09m
Lisbon Humberto Delgado
Wed 1/13
6:00 am-1:00 pm
1 stop15h 00m
$749
SeattleLisbon
SEA - LIS
SEALIS
Seattle/Tacoma Intl
Mon 12/14
3:25 pm-3:10 pm
1 stop15h 45m
Lisbon Humberto Delgado
Fri 12/25
5:30 am-3:13 pm
1 stop17h 43m
$781
SeattleFunchal
SEA - FNC
SEAFNC
Seattle/Tacoma Intl
Wed 11/11
10:50 pm-5:10 pm
2 stops34h 20m
Funchal Madeira
Wed 11/18
10:25 am-11:47 am
1 stop33h 22m
$809
SeattleLisbon
SEA - LIS
SEALIS
Seattle/Tacoma Intl
Wed 9/23
7:15 am-2:55 pm
2 stops23h 40m
Lisbon Humberto Delgado
Fri 10/2
5:00 am-4:35 pm
1 stop19h 35m
$813
SeattleLisbon
SEA - LIS
SEALIS
Seattle/Tacoma Intl
Tue 9/22
2:30 pm-5:50 pm
2 stops19h 20m
Lisbon Humberto Delgado
Fri 10/2
5:00 am-4:44 pm
2 stops19h 44m
$819
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Tue 9/22
1:30 pm-3:25 pm
1 stop17h 55m
Porto
Tue 9/29
5:00 am-4:35 pm
1 stop19h 35m
$835
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Wed 10/7
6:40 pm-10:00 pm
1 stop19h 20m
Porto
Thu 10/15
5:00 am-4:35 pm
1 stop19h 35m
$840
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Wed 9/23
6:45 pm-10:00 pm
1 stop19h 15m
Porto
Wed 10/7
5:00 am-11:52 am
1 stop14h 52m
$840
SeattlePorto
SEA - OPO
SEAOPO
Seattle/Tacoma Intl
Tue 9/15
7:15 pm-10:00 am
1 stop30h 45m
Porto
Thu 10/1
11:00 am-5:20 pm
1 stop38h 20m
$842
SeattlePonta Delgada
SEA - PDL
SEAPDL
Seattle/Tacoma Intl
Mon 8/17
5:13 pm-8:20 am
2 stops32h 07m
Ponta Delgada Nordela
Tue 9/1
11:00 am-11:34 am
2 stops31h 34m
$842
Showing 1-10 of 60 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-PDL
SEA-FNC
SEA-FAO
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-PDL
SEA-FNC
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 $488). Flying from Seattle to Portugal in June is currently the most expensive (average of $1,212). 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 80 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 July 29, 2026.
Get a feel of what it's like to fly with KLM,Delta, 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.
Overall
7.8
Comfort
7.7
Food
7.3
Boarding
7.8
Crew
8.4
Entertainment
7.2
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
Overall
7.8
Comfort
7.7
Food
7.3
Boarding
7.8
Crew
8.4
Entertainment
7.2
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
Overall
7.8
Comfort
7.7
Food
7.3
Boarding
7.8
Crew
8.4
Entertainment
7.2
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
Overall
7.8
Comfort
7.7
Food
7.3
Boarding
7.8
Crew
8.4
Entertainment
7.2
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
Overall
7.8
Comfort
7.7
Food
7.3
Boarding
7.8
Crew
8.4
Entertainment
7.2
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
Overall
7.8
Comfort
7.7
Food
7.3
Boarding
7.8
Crew
8.4
Entertainment
7.2
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
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.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Top regions
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 July 29, 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 July 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$348 | Average$430 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$475 | Average$1,143 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$481 | Average$843 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$482 | Average$903 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$488 | Average$1,152 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$497 | Average$1,042 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$505 | Average$983 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$523 | Average$850 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$543 | Average$952 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$550 | Average$1,012 | FlexibilityNo cancel fee | On-timeN/A |