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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
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
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 January 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$446
(Air Canada)

One-way from

$335
(United Airlines)

Popular in

December

Cheapest in

November

Average price

$945
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. 21% potential increase in price ($306 potential increase over avg. RT price).
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Cheapest flight prices on average. 14% potential price decrease ($142 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 8, 2026.

This Air Canada deal was found by Cheapflights users on 1/6. 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.
Sun 1/1812:19 pmBOI - LIS
2 stops38h 01mAir Canada
Thu 1/2911:20 amLIS - BOI
2 stops42h 37mAir Canada
Deal found 1/6$446
This Air Canada deal was found by Cheapflights users on 1/6. 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.
Sun 1/1812:19 pmBOI - LIS
2 stops38h 01mAir Canada
Fri 1/3011:20 amLIS - BOI
2 stops38h 53mAir Canada
Deal found 1/6$451
This American Airlines deal was found by Cheapflights users on 1/6. 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.
Wed 1/213:18 pmBOI - LIS
2 stops19h 22mAmerican Airlines
Wed 1/288:45 pmLIS - BOI
2 stops23h 23mAmerican Airlines
Deal found 1/6$452
This Priceline deal was found by Cheapflights users on 1/7. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/37:20 amBOI - LIS
2 stops25h 05mFinnair
Tue 2/104:10 pmLIS - BOI
2 stops34h 15mFinnair
Deal found 1/7$455
This Gurufare deal was found by Cheapflights users on 1/7. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/261:29 pmBOI - LIS
2 stops26h 56mFinnair
Wed 5/64:35 pmLIS - BOI
2 stops37h 03mFinnair
Deal found 1/7$457
This United Airlines deal was found by Cheapflights users on 1/6. 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 1/189:48 amBOI - LIS
2 stops15h 22mUnited Airlines
Tue 1/2710:15 amLIS - BOI
2 stops18h 37mUnited Airlines
Deal found 1/6$462
This Delta deal was found by Cheapflights users on 1/8. 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 1/275:05 amGEG - LIS
2 stops18h 55mDelta
Wed 2/410:00 amLIS - GEG
2 stops21h 59mDelta
Deal found 1/8$462
This Finnair deal was found by Cheapflights users on 1/7. 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.
Mon 4/131:29 pmBOI - LIS
2 stops19h 11mFinnair
Fri 4/244:35 pmLIS - BOI
2 stops37h 03mFinnair
Deal found 1/7$468
This United Airlines deal was found by Cheapflights users on 1/6. 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 1/189:48 amBOI - LIS
2 stops15h 22mUnited Airlines
Wed 1/2810:15 amLIS - BOI
2 stops30h 51mUnited Airlines
Deal found 1/6$474
This Delta deal was found by Cheapflights users on 1/7. 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 2/235:00 amGEG - LIS
2 stops20h 00mDelta
Sun 3/15:00 amLIS - GEG
2 stops22h 57mDelta
Deal found 1/7$478
This Delta deal was found by Cheapflights users on 1/7. 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 3/25:00 amGEG - LIS
2 stops20h 00mDelta
Sun 3/85:30 amLIS - GEG
2 stops19h 45mDelta
Deal found 1/7$483
This United Airlines deal was found by Cheapflights users on 1/6. 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 1/205:16 pmBOI - LIS
2 stops31h 54mUnited Airlines
Wed 1/2810:15 amLIS - BOI
2 stops30h 51mUnited Airlines
Deal found 1/6$487

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 January 8, 2026.
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

Tue 2/3

7:20 am-3:25 pm

2 stops25h 05m

Lisbon Humberto Delgado

Tue 2/10

4:10 pm-7:25 pm

2 stops34h 15m

$455

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 1/27

5:05 am-8:00 am

2 stops18h 55m

Lisbon Humberto Delgado

Wed 2/4

10:00 am-11:50 pm

2 stops21h 50m

$462

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 4/13

1:29 pm-3:40 pm

2 stops19h 11m

Lisbon Humberto Delgado

Fri 4/24

4:35 pm-10:38 pm

2 stops37h 03m

$468

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 1/18

9:48 am-8:10 am

2 stops15h 22m

Lisbon Humberto Delgado

Wed 1/28

10:15 am-10:06 am

2 stops30h 51m

$474

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Mon 2/23

5:00 am-9:00 am

2 stops20h 00m

Lisbon Humberto Delgado

Sun 3/1

5:00 am-7:57 pm

2 stops22h 57m

$478

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Mon 3/2

5:00 am-9:00 am

2 stops20h 00m

Lisbon Humberto Delgado

Sun 3/8

5:30 am-5:15 pm

2 stops19h 45m

$483

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Wed 2/4

6:40 am-8:10 am

2 stops18h 30m

Lisbon Humberto Delgado

Wed 2/11

10:15 am-11:48 pm

2 stops20h 33m

$487

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 1/20

5:16 pm-8:10 am

2 stops31h 54m

Lisbon Humberto Delgado

Wed 1/28

10:15 am-10:06 am

2 stops30h 51m

$487

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 4/14

1:51 pm-6:45 pm

2 stops21h 54m

Lisbon Humberto Delgado

Tue 4/28

10:00 am-10:59 pm

2 stops19h 59m

$493

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 4/14

11:20 am-6:45 pm

2 stops23h 25m

Lisbon Humberto Delgado

Tue 4/28

10:00 am-12:07 am

2 stops22h 07m

$493

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 32 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.

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 $474, Finnair can have you in Portugal from Idaho in 15h 22m. Airlines will cover a distance of 5150 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 January 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$601Average$902FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$602Average$1,181FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$621Average$1,248FlexibilityNo cancel feeOn-time71%
DeltaCheapest$654Average$1,100FlexibilityNo cancel feeOn-timeN/A

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