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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
Jan 8 — Jan 151
Thu 1/8
Thu 1/15
1 adult, Economy
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Cheap 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 December 9, 2025.

This United Airlines deal was found by Cheapflights users on 12/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/86:35 amBOI - LIS
2 stops20h 40mUnited Airlines
Tue 12/165:00 amLIS - BOI
2 stops35h 59mUnited Airlines
Deal found 12/7$732
This Air Canada deal was found by Cheapflights users on 12/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/85:25 pmBOI - LIS
2 stops32h 55mAir Canada
Tue 12/1611:20 amLIS - BOI
2 stops29h 39mAir Canada
Deal found 12/8$748
This Air France deal was found by Cheapflights users on 12/6. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/165:35 amBOI - LIS
2 stops19h 25mMultiple Airlines
Wed 1/143:30 pmLIS - BOI
2 stops31h 47mMultiple Airlines
Deal found 12/6$776
This United Airlines deal was found by Cheapflights users on 12/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:20 amBOI - LIS
2 stops20h 00mUnited Airlines
Wed 1/1411:20 amLIS - BOI
2 stops41h 32mUnited Airlines
Deal found 12/7$855
This Delta deal was found by Cheapflights users on 12/8. 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 12/165:50 amBOI - LIS
2 stops20h 10mDelta
Wed 1/145:00 amLIS - BOI
2 stops22h 55mDelta
Deal found 12/8$858
This United Airlines deal was found by Cheapflights users on 12/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/225:12 pmBOI - LIS
2 stops56h 43mUnited Airlines
Mon 1/125:00 amLIS - BOI
2 stops48h 57mUnited Airlines
Deal found 12/8$1,198
This United Airlines deal was found by Cheapflights users on 12/9. 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 12/235:12 pmBOI - LIS
2 stops34h 03mUnited Airlines
Wed 12/3111:00 amLIS - BOI
2 stops42h 59mUnited Airlines
Deal found 12/9$1,339
This United Airlines deal was found by Cheapflights users on 12/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/226:55 pmBOI - LIS
2 stops55h 00mUnited Airlines
Sat 1/35:00 amLIS - BOI
2 stops44h 03mUnited Airlines
Deal found 12/8$1,846
This oojo deal was found by Cheapflights users on 12/7. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/88:25 amBOI - LIS
1 stop20h 10mMultiple Airlines
Tue 12/1610:30 amLIS - BOI
1 stop19h 35mMultiple Airlines
Deal found 12/7$1,977
This Air Canada deal was found by Cheapflights users on 12/7. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/137:11 pmBOI - LIS
2 stops31h 09mAir Canada
Wed 12/1711:00 amLIS - BOI
2 stops33h 36mAir Canada
Deal found 12/7$1,997
This Finnair deal was found by Cheapflights users on 12/7. 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.
Thu 12/185:28 amGEG - LIS
2 stops19h 37mMultiple Airlines
Fri 1/211:05 amLIS - GEG
2 stops18h 23mMultiple Airlines
Deal found 12/7$2,604
This United Airlines deal was found by Cheapflights users on 12/9. 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 12/185:05 amGEG - LIS
2 stops19h 05mUnited Airlines
Fri 1/211:55 amLIS - GEG
2 stops32h 50mUnited Airlines
Deal found 12/9$2,902

Find flight deals from Idaho to Portugal

Keep the following information in mind while searching for Idaho to Portugal flight deals. Data was last updated December 9, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$487
(FlightHub)

One-way from

$335
(United Airlines)

Popular in

June

Cheapest in

December

Average price

$627
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Lisbon Humberto Delgado flights.
Search Deals
From Idaho to Portugal
Search Deals
One-way flight from Idaho to Portugal
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($291 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 9, 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

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Wed 1/14

1:41 pm-9:20 am

2 stops36h 39m

Lisbon Humberto Delgado

Sun 1/18

10:50 am-12:58 pm

2 stops33h 08m

$493

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Thu 2/5

5:00 am-7:55 am

2 stops18h 55m

Lisbon Humberto Delgado

Fri 2/13

10:55 am-9:07 pm

2 stops42h 12m

$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

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Fri 2/6

6:10 am-8:10 am

2 stops19h 00m

Lisbon Humberto Delgado

Tue 2/10

5:00 am-9:25 pm

2 stops23h 25m

$498

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 1/22

9:48 am-8:10 am

2 stops15h 22m

Lisbon Humberto Delgado

Thu 1/29

5:00 am-11:25 am

2 stops37h 25m

$498

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 1/23

5:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Tue 1/27

5:00 am-11:39 am

2 stops38h 39m

$503

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sun 3/1

11:20 am-3:10 pm

2 stops19h 50m

Lisbon Humberto Delgado

Sat 3/14

5:30 am-4:09 pm

2 stops17h 39m

$506

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 1/22

8:15 am-9:20 am

3 stops18h 05m

Lisbon Humberto Delgado

Thu 1/29

11:20 am-10:06 am

2 stops29h 46m

$519

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 1/23

11:25 am-4:25 pm

3 stops21h 00m

Lisbon Humberto Delgado

Fri 1/30

11:20 am-11:39 am

2 stops32h 19m

$615

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 5/2

5:00 am-9:20 am

2 stops45h 20m

Lisbon Humberto Delgado

Tue 5/12

5:05 am-11:06 pm

2 stops25h 01m

$647

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/7

Showing 1-10 of 27 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 December 9, 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 11% 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 $493, United Airlines can have you in Portugal from Idaho in 36h 39m. Airlines will cover a distance of 4932 mi.

  • 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 December 9, 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$1,083FlexibilityNo cancel feeOn-timeN/A

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