Portugal

$299+ Cheap flights from Maine 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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LIS
May 21 — May 281
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Cheap flight deals from Maine to Portugal

Cheapest flights from Maine to Portugal
Explore the most affordable flight options available from Maine to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 21, 2026.

This United Airlines deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:00 am
BOS
-
OPO
2 stops22h 30m
United Airlines
Wed 11/1112:35 pm
OPO
-
BOS
2 stops16h 19m
United Airlines
Deal found 4/19$601
This United Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:50 pm
BOS
-
OPO
1 stop31h 10m
United Airlines
Wed 11/186:00 am
OPO
-
BOS
1 stop12h 10m
United Airlines
Deal found 4/20$602
This Kiwi.com deal was found by Cheapflights users on 4/17. 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 9/258:50 pm
BOS
-
FAO
2 stops17h 55m
Multiple Airlines
Thu 10/89:40 am
FAO
-
BOS
1 stop16h 35m
Multiple Airlines
Deal found 4/17$602
This United Airlines deal was found by Cheapflights users on 4/18. 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 11/236:30 pm
BOS
-
OPO
1 stop10h 00m
United Airlines
Fri 12/46:00 am
OPO
-
BOS
1 stop12h 10m
United Airlines
Deal found 4/18$603
This United Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:45 am
BOS
-
OPO
2 stops16h 15m
United Airlines
Wed 11/1812:35 pm
OPO
-
BOS
2 stops16h 19m
United Airlines
Deal found 4/20$604
This United Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1410:40 am
BOS
-
OPO
1 stop15h 20m
United Airlines
Wed 10/2112:45 pm
OPO
-
BOS
2 stops30h 37m
United Airlines
Deal found 4/20$605
This Lufthansa deal was found by Cheapflights users on 4/20. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/29:50 pm
BOS
-
OPO
1 stop15h 40m
SWISS
Thu 11/1212:05 pm
OPO
-
BOS
1 stop13h 15m
SWISS
Deal found 4/20$606
This Delta deal was found by Cheapflights users on 4/20. 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.
Sat 10/3110:00 pm
BOS
-
OPO
1 stop31h 05m
Delta
Fri 11/135:00 am
OPO
-
BOS
1 stop18h 55m
Delta
Deal found 4/20$607
This Justfly.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/48:40 pm
BOS
-
OPO
1 stop11h 10m
Multiple Airlines
Mon 11/97:20 pm
OPO
-
BOS
1 stop30h 00m
Multiple Airlines
Deal found 4/17$608
This Delta deal was found by Cheapflights users on 4/20. 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 10/281:10 pm
BOS
-
OPO
1 stop14h 55m
Delta
Wed 11/411:25 am
OPO
-
BOS
2 stops16h 01m
Delta
Deal found 4/20$611
This Kiwi.com deal was found by Cheapflights users on 4/18. 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.
Mon 9/148:50 pm
BOS
-
OPO
2 stops21h 40m
Multiple Airlines
Wed 9/232:05 pm
OPO
-
BOS
1 stop12h 10m
Multiple Airlines
Deal found 4/18$612
This Kiwi.com deal was found by Cheapflights users on 4/16. 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.
Sun 5/39:50 pm
BOS
-
FAO
2 stops38h 45m
Multiple Airlines
Tue 5/196:45 pm
FAO
-
BOS
1 stop31h 20m
Multiple Airlines
Deal found 4/16$616

Find flight deals from Maine to Portugal

Keep the following information in mind while searching for Maine to Portugal flight deals. Data was last updated April 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$601
(Delta)

One-way from

$299
(Booking.com)

Popular in

December

Cheapest in

February

Average price

$1,233
Provider with most accurate pricing for Portland-Lisbon Humberto Delgado flight deals.
Provider most trusted by Cheapflights users for Portland-Lisbon Humberto Delgado flights.
From Maine to Portugal
One-way flight from Maine to Portugal
Highest demand for flights based on searches. 10% potential increase in price ($123 potential increase over avg. RT price).
Cheapest flight prices on average. 13% potential price decrease ($126 potential savings vs. average RT price).
Average for round-trip flights in April 2026

Cheapflights Fare Finder

 
Customize your flight search to find flights from Maine 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 April 21, 2026.
Use the filters below to find and compare flights from Maine to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Sun 4/26

7:05 pm-3:25 pm

1 stop15h 20m

Porto

Wed 5/6

5:00 am-6:30 pm

1 stop18h 30m

$616

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Mon 4/27

7:05 pm-3:25 pm

1 stop15h 20m

Porto

Wed 5/20

5:00 am-6:30 pm

1 stop18h 30m

$646

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 4/29

7:05 pm-3:25 pm

1 stop15h 20m

Porto

Fri 5/22

9:25 am-11:37 pm

2 stops19h 12m

$656

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Sun 4/26

7:05 pm-3:25 pm

1 stop15h 20m

Porto

Sun 5/3

5:55 am-7:40 pm

1 stop18h 45m

$666

BostonLisbon

BOS - LIS

BOSLIS

Boston Logan Intl

Sun 7/5

11:50 pm-8:30 am

1 stop27h 40m

Lisbon Humberto Delgado

Wed 7/15

9:15 pm-9:15 pm

1 stop29h 00m

$688

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Tue 5/12

1:29 pm-10:55 am

2 stops16h 26m

Porto

Thu 5/21

5:55 am-1:25 pm

1 stop12h 30m

$692

BostonFaro

BOS - FAO

BOSFAO

Boston Logan Intl

Mon 5/4

3:32 pm-2:30 pm

2 stops17h 58m

Faro

Tue 5/19

11:40 am-10:18 am

2 stops27h 38m

$709

BostonFaro

BOS - FAO

BOSFAO

Boston Logan Intl

Wed 5/6

4:35 pm-7:10 am

1 stop33h 35m

Faro

Tue 5/12

10:00 am-11:37 pm

2 stops18h 37m

$718

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Mon 5/4

1:30 pm-10:40 am

2 stops16h 10m

Porto

Mon 5/18

6:30 am-1:25 pm

1 stop11h 55m

$722

BostonFaro

BOS - FAO

BOSFAO

Boston Logan Intl

Wed 5/13

4:35 pm-7:10 am

1 stop33h 35m

Faro

Tue 5/19

8:15 pm-4:25 pm

1 stop25h 10m

$737

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/18

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Maine to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal from Maine with our price prediction graph.
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 Maine to Portugal
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Maine to Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • How long is the flight from Maine to Portugal?

    For as low as $616, Delta can have you in Portugal from Maine in 15h 20m. Maine and Portugal are separated by a distance of 3134 mi. This flight may include one or multiple stops.

  • Can I find deals for flights from Maine to Portugal that include hotel bookings?

    Yes. In addition to deals on Maine to Portugal flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Maine to Portugal?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Maine to Portugal.

  • Can I find deals for business class flights from Maine to Portugal?

    Yes. Cheapflights offers flight deals from Maine to Portugal by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Maine to Portugal

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Maine to Portugal

Discover the top airline that operate flights from Maine 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 April 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$721FlexibilityNo cancel feeOn-time69%

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