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Portugal

$367+ 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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$552
(United Airlines)

One-way from

$367
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$1,147
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. 16% potential increase in price ($206 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 16, 2025.

This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/115:10 amGEG - LIS
2 stops20h 10mUnited Airlines
Tue 11/1811:20 amLIS - GEG
2 stops32h 11mUnited Airlines
Deal found 9/15$552
This Finnair deal was found by Cheapflights users on 9/15. 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.
Tue 12/166:44 amBOI - LIS
2 stops19h 31mMultiple Airlines
Wed 1/144:10 pmLIS - BOI
2 stops36h 08mMultiple Airlines
Deal found 9/15$619
This Finnair deal was found by Cheapflights users on 9/15. 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.
Sun 10/197:00 amBOI - LIS
2 stops33h 05mFinnair
Mon 11/34:10 pmLIS - BOI
2 stops37h 22mFinnair
Deal found 9/15$621
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1511:41 amBOI - LIS
2 stops23h 14mDelta
Thu 10/3010:00 amLIS - BOI
2 stops20h 08mDelta
Deal found 9/15$642
This Scandinavian Airlines deal was found by Cheapflights users on 9/15. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/63:54 pmBOI - LIS
2 stops34h 01mScandinavian Airlines
Wed 12/107:00 pmLIS - BOI
2 stops34h 36mScandinavian Airlines
Deal found 9/15$659
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1311:41 amBOI - LIS
2 stops23h 09mDelta
Mon 10/205:00 amLIS - BOI
2 stops22h 16mDelta
Deal found 9/15$678
This Delta deal was found by Cheapflights users on 9/14. 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 10/75:25 amBOI - LIS
2 stops19h 35mDelta
Wed 10/155:40 amLIS - BOI
2 stops21h 36mDelta
Deal found 9/14$681
This Air France deal was found by Cheapflights users on 9/15. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/711:41 amBOI - LIS
2 stops16h 34mAir France
Wed 10/155:40 amLIS - BOI
2 stops17h 26mAir France
Deal found 9/15$696
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/152:12 pmBOI - LIS
2 stops36h 08mUnited Airlines
Thu 10/305:00 amLIS - BOI
3 stops38h 44mUnited Airlines
Deal found 9/15$711
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/162:00 pmBOI - LIS
2 stops21h 40mDelta
Mon 10/205:00 amLIS - BOI
2 stops24h 06mDelta
Deal found 9/15$713
This United Airlines deal was found by Cheapflights users on 9/13. 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.
Wed 12/35:00 amGEG - LIS
2 stops21h 15mUnited Airlines
Sun 12/710:50 amLIS - GEG
2 stops42h 09mUnited Airlines
Deal found 9/13$713
This Air France deal was found by Cheapflights users on 9/15. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/61:00 pmBOI - LIS
2 stops18h 50mMultiple Airlines
Mon 10/205:00 amLIS - BOI
2 stops22h 16mMultiple Airlines
Deal found 9/15$725

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 September 16, 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

Tue 11/11

5:10 am-9:20 am

2 stops20h 10m

Lisbon Humberto Delgado

Tue 11/18

11:20 am-11:31 am

2 stops32h 11m

$552

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-7:01 pm

2 stops39h 41m

$563

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 12/16

6:44 am-9:15 am

2 stops19h 31m

Lisbon Humberto Delgado

Wed 1/14

4:10 pm-9:18 pm

2 stops36h 08m

$619

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 10/19

7:00 am-11:05 pm

2 stops33h 05m

Lisbon Humberto Delgado

Mon 11/3

4:10 pm-10:32 pm

2 stops37h 22m

$621

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Wed 10/15

11:41 am-5:55 pm

2 stops23h 14m

Lisbon Humberto Delgado

Thu 10/30

10:00 am-12:08 am

2 stops20h 08m

$642

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Fri 1/16

3:30 pm-5:30 pm

2 stops19h 00m

Lisbon Humberto Delgado

Tue 1/20

10:00 am-4:33 pm

2 stops37h 33m

$656

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 1/27

11:25 am-9:20 am

2 stops37h 55m

Lisbon Humberto Delgado

Wed 2/4

11:20 am-12:46 pm

3 stops33h 26m

$658

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 12/6

3:54 pm-8:55 am

2 stops34h 01m

Lisbon Humberto Delgado

Wed 12/10

7:05 am-10:36 pm

2 stops22h 31m

$659

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Fri 1/16

7:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Tue 1/20

10:15 am-8:42 pm

2 stops17h 27m

$660

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 10/7

11:41 am-11:15 am

2 stops16h 34m

Lisbon Humberto Delgado

Wed 10/15

5:40 am-4:06 pm

2 stops17h 26m

$696

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 29 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, January is the cheapest month in which you can book a flight from Idaho to Portugal (average of $612). Flying from Idaho to Portugal in June is currently the most expensive (average of $1,127). 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 September 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to Portugal as you normally would.

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, United Airlines can have you in Portugal from Idaho in 20h 10m. Airlines will cover a distance of 5022 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, January is the cheapest month in which you can book a flight from Idaho to Portugal (average of $612). Flying from Idaho to Portugal in June is currently the most expensive (average of $1,127). 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$601Average$1,061FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$602Average$1,181FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$621Average$1,248FlexibilityNo cancel feeOn-time71%
DeltaCheapest$654Average$1,238FlexibilityNo cancel feeOn-timeN/A

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