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Portugal

$489+ Cheap flights from Idaho to Portugal

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Dec 18 — Dec 251
Thu 12/18
Thu 12/25
1 adult, Economy
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Cheap flight deals from Idaho to Portugal

Keep the following information in mind while searching for Idaho to Portugal flight deals. Data was last updated November 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$483
(United Airlines)

Popular in

June

Cheapest in

December

Average price

$649
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Lisbon Humberto Delgado flight deals.
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Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Lisbon Humberto Delgado flights.
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From Idaho to Portugal
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Highest demand for flights based on searches. 23% potential increase in price ($294 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($46 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 Idaho to Portugal

Cheapest flights from Idaho to Portugal
Explore the most affordable flight options available from Idaho to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 18, 2025.

This United Airlines deal was found by Cheapflights users on 11/18. 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.
Tue 12/26:35 amBOI - LIS
2 stops19h 45mUnited Airlines
Wed 12/1011:00 amLIS - BOI
2 stops43h 44mUnited Airlines
Deal found 11/18$554
This United Airlines deal was found by Cheapflights users on 11/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/87:11 pmBOI - LIS
2 stops32h 04mUnited Airlines
Tue 12/1611:20 amLIS - BOI
2 stops54h 19mUnited Airlines
Deal found 11/17$570
This American Airlines deal was found by Cheapflights users on 11/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/87:35 amBOI - LIS
2 stops18h 30mMultiple Airlines
Tue 12/1611:05 amLIS - BOI
2 stops19h 54mMultiple Airlines
Deal found 11/17$575
This United Airlines deal was found by Cheapflights users on 11/16. 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.
Wed 12/310:54 amJAC - LIS
2 stops14h 16mUnited Airlines
Sun 12/710:50 amLIS - JAC
2 stops40h 47mUnited Airlines
Deal found 11/16$609
This United Airlines deal was found by Cheapflights users on 11/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/115:25 amGEG - LIS
2 stops20h 50mUnited Airlines
Sun 12/145:00 amLIS - GEG
2 stops45h 44mUnited Airlines
Deal found 11/17$667
This United Airlines deal was found by Cheapflights users on 11/16. 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 12/169:40 amBOI - LIS
2 stops17h 35mUnited Airlines
Wed 1/1411:20 amLIS - BOI
2 stops43h 28mUnited Airlines
Deal found 11/16$716
This KLM deal was found by Cheapflights users on 11/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:00 amGEG - FAO
2 stops26h 55mKLM
Mon 12/87:15 pmFAO - GEG
2 stops31h 22mKLM
Deal found 11/17$743
This Air Canada deal was found by Cheapflights users on 11/17. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/28:17 amBOI - LIS
3 stops18h 03mMultiple Airlines
Wed 12/1011:00 amLIS - BOI
2 stops31h 34mMultiple Airlines
Deal found 11/17$914
This Delta deal was found by Cheapflights users on 11/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/711:44 amBOI - LIS
2 stops20h 26mDelta
Thu 12/115:00 amLIS - BOI
2 stops18h 02mDelta
Deal found 11/16$919
This Air Canada deal was found by Cheapflights users on 11/17. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/115:25 amGEG - LIS
2 stops19h 55mMultiple Airlines
Sun 12/1410:50 amLIS - GEG
3 stops33h 55mMultiple Airlines
Deal found 11/17$995
This Finnair deal was found by Cheapflights users on 11/15. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/197:00 amBOI - LIS
2 stops18h 55mMultiple Airlines
Fri 11/216:30 amLIS - BOI
2 stops22h 37mMultiple Airlines
Deal found 11/15$1,050
This United Airlines deal was found by Cheapflights users on 11/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/237:00 amBOI - LIS
2 stops44h 15mUnited Airlines
Wed 12/3111:00 amLIS - BOI
2 stops32h 39mUnited Airlines
Deal found 11/17$1,237

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho 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 18, 2025.
Use the filters below to find and compare flights from Idaho to Portugal that are best for you.

Fly from

Idaho

Fly to

Portugal

Route

Depart

Return

Price

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 1/24

8:15 am-8:55 am

2 stops17h 40m

Lisbon Humberto Delgado

Mon 2/2

11:20 am-6:07 pm

2 stops37h 47m

$489

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sun 1/25

5:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Sun 2/1

5:00 am-7:16 pm

2 stops22h 16m

$493

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 1/27

5:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Wed 2/4

11:20 am-9:22 pm

2 stops42h 02m

$494

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 1/16

5:00 am-9:20 am

2 stops20h 20m

Lisbon Humberto Delgado

Fri 1/23

11:20 am-11:39 am

2 stops32h 19m

$496

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 2/5

7:20 am-9:05 am

2 stops18h 45m

Lisbon Humberto Delgado

Fri 2/13

4:10 pm-10:36 pm

2 stops37h 26m

$499

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 1/24

8:15 am-8:55 am

3 stops17h 40m

Lisbon Humberto Delgado

Mon 2/2

11:20 am-10:57 pm

2 stops18h 37m

$519

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sun 1/25

5:00 am-9:20 am

2 stops20h 20m

Lisbon Humberto Delgado

Sun 2/1

10:50 am-12:46 pm

3 stops33h 56m

$534

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 12/2

6:35 am-9:20 am

2 stops19h 45m

Lisbon Humberto Delgado

Wed 12/10

11:00 am-11:44 pm

2 stops43h 44m

$554

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Wed 12/3

10:54 am-8:10 am

2 stops14h 16m

Lisbon Humberto Delgado

Sun 12/7

10:50 am-8:37 pm

2 stops40h 47m

$609

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Thu 12/11

5:25 am-10:15 am

2 stops20h 50m

Lisbon Humberto Delgado

Sun 12/14

5:00 am-6:44 pm

2 stops45h 44m

$667

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/16

Showing 1-10 of 30 results
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Best time to book a flight from Idaho to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal from Idaho 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 Idaho to Portugal

What is the cheapest month to book a flight from Idaho to Portugal?

Currently, February is the cheapest month in which you can book a flight from Idaho to Portugal (average of $546). Flying from Idaho to Portugal in June is currently the most expensive (average of $1,028). 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.

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

Find hourly flight availability from Idaho 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 18, 2025.

One of the essential ways to save on airfare from Idaho to Portugal is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 30% on airfare.

Related info for your journey

Find useful and relevant information for your journey from Idaho 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 Idaho to Portugal?

    For as low as $489, Air Canada can have you in Portugal from Idaho in 17h 40m. Airlines will cover a distance of 5150 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $533. Users have also found prices from $533 and $533 on Air Canada and Air France, respectively.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Idaho 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.

  • What is the cheapest month to book a flight from Idaho to Portugal?

    Currently, February is the cheapest month in which you can book a flight from Idaho to Portugal (average of $546). Flying from Idaho to Portugal in June is currently the most expensive (average of $1,028). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Idaho to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Idaho to Portugal

Discover the top 4 airlines that operate flights from Idaho 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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$601Average$1,062FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$602Average$1,181FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$621Average$1,248FlexibilityNo cancel feeOn-time71%
DeltaCheapest$654Average$1,045FlexibilityNo cancel feeOn-timeN/A

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