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Portugal

$335+ Cheap flights from Idaho 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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Dec 25 — Jan 11
Thu 12/25
Thu 1/1
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 25, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$460
(Delta)

One-way from

$335
(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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One-way flight 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 25, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 11/25. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/22:49 pmBOI - LIS
2 stops25h 41mLufthansa
Wed 12/105:00 amLIS - BOI
2 stops21h 43mLufthansa
Deal found 11/25$553
This Air Canada deal was found by Cheapflights users on 11/23. 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 12/26:35 amBOI - LIS
2 stops19h 45mAir Canada
Wed 12/1011:00 amLIS - BOI
2 stops41h 25mAir Canada
Deal found 11/23$554
This United Airlines deal was found by Cheapflights users on 11/24. 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 12/82:49 pmBOI - LIS
2 stops36h 26mUnited Airlines
Tue 12/1611:20 amLIS - BOI
2 stops54h 19mUnited Airlines
Deal found 11/24$569
This Delta deal was found by Cheapflights users on 11/23. 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 12/87:30 amBOI - LIS
2 stops18h 30mDelta
Tue 12/1610:00 amLIS - BOI
2 stops21h 42mDelta
Deal found 11/23$575
This United Airlines deal was found by Cheapflights users on 11/24. 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 stops39h 25mUnited Airlines
Deal found 11/24$747
This Cheapflightsfares deal was found by Cheapflights users on 11/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/286:00 amGEG - LIS
2 stops30h 00mLufthansa
Fri 12/55:00 amLIS - GEG
2 stops23h 59mLufthansa
Deal found 11/24$766
This United Airlines deal was found by Cheapflights users on 11/24. 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 12/226:15 amBOI - LIS
2 stops18h 55mUnited Airlines
Sat 1/311:55 amLIS - BOI
2 stops29h 06mUnited Airlines
Deal found 11/24$895
This Air Canada deal was found by Cheapflights users on 11/24. 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 stops17h 25mMultiple Airlines
Deal found 11/24$1,077
This United Airlines deal was found by Cheapflights users on 11/23. 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 12/238:20 amBOI - LIS
2 stops42h 55mUnited Airlines
Wed 12/3111:00 amLIS - BOI
2 stops32h 39mUnited Airlines
Deal found 11/23$1,330
This United Airlines deal was found by Cheapflights users on 11/24. 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 11/276:00 amGEG - LIS
2 stops20h 15mUnited Airlines
Sun 11/3011:55 amLIS - GEG
2 stops31h 36mUnited Airlines
Deal found 11/24$1,438
This Kiwi.com deal was found by Cheapflights users on 11/24. 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 11/286:10 pmGEG - LIS
1 stop33h 35mMultiple Airlines
Fri 12/59:00 amLIS - GEG
2 stops20h 28mMultiple Airlines
Deal found 11/24$1,920
This Finnair deal was found by Cheapflights users on 11/24. 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.
Thu 12/185:28 amGEG - LIS
2 stops19h 37mMultiple Airlines
Fri 1/211:05 amLIS - GEG
2 stops18h 23mMultiple Airlines
Deal found 11/24$2,604

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 25, 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

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sat 1/10

11:25 am-9:20 am

2 stops37h 55m

Lisbon Humberto Delgado

Mon 2/9

11:20 am-12:46 pm

2 stops33h 26m

$470

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Wed 1/7

7:20 am-6:55 am

2 stops16h 35m

Lisbon Humberto Delgado

Wed 1/14

4:10 pm-7:25 pm

2 stops34h 15m

$485

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 1/9

11:25 am-8:55 am

2 stops37h 30m

Lisbon Humberto Delgado

Thu 2/12

11:20 am-9:52 pm

2 stops42h 32m

$488

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Wed 2/18

5:10 pm-7:55 am

2 stops31h 45m

Lisbon Humberto Delgado

Mon 2/23

11:20 am-9:32 pm

2 stops41h 12m

$489

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-7:45 pm

2 stops39h 25m

$489

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Thu 1/29

5:00 am-9:20 am

2 stops20h 20m

Lisbon Humberto Delgado

Mon 2/2

11:20 am-12:46 pm

2 stops33h 26m

$489

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Thu 1/8

5:00 am-9:20 am

2 stops20h 20m

Lisbon Humberto Delgado

Sun 2/8

10:50 am-9:22 pm

2 stops42h 32m

$489

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Thu 1/15

5:00 am-9:20 am

2 stops20h 20m

Lisbon Humberto Delgado

Fri 1/30

11:20 am-9:22 pm

2 stops42h 02m

$489

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Mon 1/12

11:25 am-5:30 pm

2 stops22h 05m

Lisbon Humberto Delgado

Wed 2/11

5:00 am-10:52 pm

2 stops25h 52m

$491

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Mon 1/12

11:25 am-5:30 pm

2 stops22h 05m

Lisbon Humberto Delgado

Sun 2/8

5:00 am-7:54 pm

2 stops22h 54m

$491

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/23

Showing 1-10 of 34 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 25, 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 evening tend to be the most expensive. A flight in the afternoon could potentially save you up to 22% 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 $552, Air Canada can have you in Portugal from Idaho in 19h 35m. Airlines will cover a distance of 5155 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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

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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 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$601Average$1,060FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$602Average$1,181FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$621Average$1,248FlexibilityNo cancel feeOn-time71%
DeltaCheapest$654Average$1,093FlexibilityNo cancel feeOn-timeN/A

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