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Portugal

$199+ 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 12/1. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LIS
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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Cheap flight deals from Maine to Portugal

Keep the following information in mind while searching for Maine to Portugal flight deals. Data was last updated November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$390
(American Airlines)

One-way from

$199
(SmartFares)

Popular in

December

Cheapest in

February

Average price

$728
Provider with most accurate pricing for Portland-Lisbon Humberto Delgado flight deals.
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Provider most trusted by Cheapflights users for Portland-Lisbon Humberto Delgado flights.
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From Maine to Portugal
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One-way flight from Maine to Portugal
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Highest demand for flights based on searches. 47% potential increase in price ($1,337 potential increase over avg. RT price).
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Cheapest flight prices on average. 62% potential price decrease ($555 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find 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 November 13, 2025.

This United Airlines deal was found by Cheapflights users on 11/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/248:45 amBOS - OPO
1 stop19h 45mUnited Airlines
Wed 12/312:30 pmOPO - BOS
1 stop29h 55mUnited Airlines
Deal found 11/13$395
This United Airlines deal was found by Cheapflights users on 11/12. 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.
Sun 11/236:24 pmBOS - OPO
1 stop10h 06mUnited Airlines
Tue 12/212:30 pmOPO - BOS
1 stop29h 55mUnited Airlines
Deal found 11/12$399
This Delta deal was found by Cheapflights users on 11/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/246:30 pmBOS - OPO
1 stop11h 00mDelta
Wed 12/311:25 amOPO - BOS
1 stop33h 55mDelta
Deal found 11/12$405
This United deal was found by Cheapflights users on 11/12. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/235:30 amBOS - OPO
2 stops23h 00mMultiple Airlines
Tue 12/29:10 amOPO - BOS
2 stops40h 10mMultiple Airlines
Deal found 11/12$406
This KLM deal was found by Cheapflights users on 11/11. 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.
Tue 12/97:05 pmBOS - OPO
1 stop15h 20mKLM
Tue 12/234:10 pmOPO - BOS
1 stop26h 10mKLM
Deal found 11/11$407
This Mytrip deal was found by Cheapflights users on 11/12. 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.
Thu 12/45:30 amBOS - OPO
2 stops24h 40mMultiple Airlines
Fri 12/1212:50 pmOPO - BOS
1 stop12h 10mMultiple Airlines
Deal found 11/12$412
This Delta deal was found by Cheapflights users on 11/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/97:10 pmBOS - OPO
1 stop15h 15mDelta
Tue 12/1611:25 amOPO - BOS
2 stops16h 01mDelta
Deal found 11/12$416
This FlightHub deal was found by Cheapflights users on 11/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/245:30 amBOS - OPO
2 stops24h 45mMultiple Airlines
Mon 12/19:10 amOPO - BOS
2 stops40h 10mMultiple Airlines
Deal found 11/12$417
This Delta deal was found by Cheapflights users on 11/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/268:50 pmBOS - OPO
1 stop20h 35mDelta
Tue 12/211:25 amOPO - BOS
1 stop31h 10mDelta
Deal found 11/12$418
This Booking.com deal was found by Cheapflights users on 11/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/92:15 pmBOS - OPO
2 stops16h 25mMultiple Airlines
Tue 12/1612:05 pmOPO - BOS
1 stop13h 15mMultiple Airlines
Deal found 11/13$419
This Mytrip deal was found by Cheapflights users on 11/11. 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 12/103:40 pmBOS - LIS
2 stops21h 25mMultiple Airlines
Wed 12/176:25 amLIS - BOS
2 stops17h 10mMultiple Airlines
Deal found 11/11$489
This Delta deal was found by Cheapflights users on 11/11. 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.
Tue 12/98:35 pmBOS - LIS
Nonstop6h 25mDelta
Tue 12/2311:15 amLIS - BOS
Nonstop7h 45mDelta
Deal found 11/11$491

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 November 13, 2025.
Use the filters below to find and compare flights from Maine to Portugal that are best for you.

Fly from

Maine

Fly to

Portugal

Route

Depart

Return

Price

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 12/3

8:25 pm-10:25 am

1 stop33h 00m

Porto

Wed 12/10

11:15 am-6:55 pm

1 stop12h 40m

$395

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 2/11

11:30 am-10:30 am

2 stops18h 00m

Porto

Wed 2/18

6:00 am-1:25 pm

1 stop12h 25m

$399

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 2/11

8:50 pm-7:20 pm

1 stop17h 30m

Porto

Wed 2/25

11:15 am-1:25 pm

1 stop31h 10m

$407

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 11/26

8:50 pm-3:25 pm

1 stop13h 35m

Porto

Tue 12/2

9:55 am-1:20 pm

1 stop32h 25m

$407

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 2/11

8:50 pm-7:20 pm

1 stop17h 30m

Porto

Wed 2/18

6:00 am-6:55 pm

1 stop17h 55m

$407

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 2/11

11:30 am-10:30 am

2 stops18h 00m

Porto

Wed 2/25

11:25 am-11:51 pm

2 stops17h 26m

$408

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 1/7

4:20 pm-11:40 am

1 stop14h 20m

Porto

Thu 1/22

6:00 am-1:35 pm

1 stop12h 35m

$422

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 1/7

4:20 pm-11:40 am

1 stop14h 20m

Porto

Tue 1/20

6:00 am-6:32 pm

2 stops17h 32m

$431

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Tue 11/25

6:05 am-10:30 am

2 stops23h 25m

Porto

Tue 12/2

11:25 am-6:59 pm

2 stops36h 34m

$432

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Fri 1/30

9:20 pm-4:00 pm

1 stop13h 40m

Porto

Fri 2/6

12:25 pm-10:56 pm

2 stops15h 31m

$435

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 60 results
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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

What is the cheapest time of day to fly from ME to PT?

Find hourly flight availability from Maine to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 13, 2025.

It’s typically best to fly out from Maine to Portugal in the evening. Doing so could potentially save you 41% on the flight price compared to flying in the morning, which is usually more expensive.

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 $479, KLM can have you in Portugal from Maine in 12h 10m. Maine and Portugal are separated by a distance of 3293 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Maine to Portugal one-way?

    For one-way options, check prices for TAP AIR PORTUGAL. According to our data, you can fly for as low as $206. Users have also found prices from $309 and $329 on LEVEL and Lufthansa, respectively.

  • 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.
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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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$578Average$778FlexibilityNo cancel feeOn-time69%

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