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Portugal

$349+ 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 20 — Feb 271
Fri 2/20
Fri 2/27
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 January 21, 2026.

This Iberia deal was found by Cheapflights users on 1/20. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/47:20 am
BOI
-
LIS
2 stops31h 30m
Multiple Airlines
Wed 2/118:20 am
LIS
-
BOI
2 stops19h 58m
Multiple Airlines
Deal found 1/20$453
This Iberia deal was found by Cheapflights users on 1/20. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/276:00 am
GEG
-
LIS
2 stops22h 05m
Multiple Airlines
Wed 2/46:45 pm
LIS
-
GEG
2 stops32h 04m
Multiple Airlines
Deal found 1/20$453
This Finnair deal was found by Cheapflights users on 1/19. 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 2/247:00 am
BOI
-
LIS
2 stops25h 25m
Multiple Airlines
Thu 3/54:10 pm
LIS
-
BOI
2 stops37h 12m
Multiple Airlines
Deal found 1/19$454
This United Airlines deal was found by Cheapflights users on 1/20. 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 2/36:10 am
BOI
-
LIS
2 stops19h 00m
United Airlines
Tue 2/1010:15 am
LIS
-
BOI
2 stops19h 42m
United Airlines
Deal found 1/20$462
This Iberia deal was found by Cheapflights users on 1/21. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/186:00 am
GEG
-
LIS
2 stops27h 40m
Multiple Airlines
Wed 2/258:45 pm
LIS
-
GEG
2 stops32h 27m
Multiple Airlines
Deal found 1/21$463
This Iberia deal was found by Cheapflights users on 1/21. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/236:00 am
GEG
-
LIS
2 stops24h 55m
Multiple Airlines
Tue 3/107:40 pm
LIS
-
GEG
2 stops32h 32m
Multiple Airlines
Deal found 1/21$478
This Iberia deal was found by Cheapflights users on 1/20. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:53 pm
BOI
-
LIS
2 stops23h 12m
Iberia
Tue 4/288:45 pm
LIS
-
BOI
2 stops31h 22m
Iberia
Deal found 1/20$479
This Iberia deal was found by Cheapflights users on 1/20. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/146:00 am
GEG
-
LIS
2 stops28h 25m
Iberia
Tue 4/288:45 pm
LIS
-
GEG
2 stops31h 43m
Iberia
Deal found 1/20$479
This United Airlines deal was found by Cheapflights users on 1/21. 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 2/195:00 am
GEG
-
LIS
2 stops18h 55m
United Airlines
Thu 2/2611:20 am
LIS
-
GEG
2 stops43h 40m
United Airlines
Deal found 1/21$490
This United Airlines deal was found by Cheapflights users on 1/19. 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 3/2310:49 am
BOI
-
LIS
2 stops30h 41m
United Airlines
Wed 4/16:15 am
LIS
-
BOI
2 stops34h 39m
United Airlines
Deal found 1/19$492
This United Airlines deal was found by Cheapflights users on 1/21. 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 2/1812:38 pm
GEG
-
LIS
3 stops37h 37m
United Airlines
Wed 2/255:00 am
LIS
-
GEG
2 stops42h 16m
United Airlines
Deal found 1/21$499
This United Airlines deal was found by Cheapflights users on 1/19. 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.
Sat 3/216:55 pm
BOI
-
LIS
2 stops22h 35m
United Airlines
Wed 4/16:15 am
LIS
-
BOI
2 stops34h 39m
United Airlines
Deal found 1/19$501

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 January 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$453
(Iberia)

One-way from

$349
(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.
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. 21% potential increase in price ($309 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 14% potential price decrease ($143 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 21, 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 4/28

6:44 am-3:50 pm

2 stops26h 06m

Lisbon Humberto Delgado

Tue 5/5

4:35 pm-10:38 pm

2 stops37h 03m

$454

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 2/24

7:00 am-3:25 pm

2 stops25h 25m

Lisbon Humberto Delgado

Thu 3/5

4:10 pm-10:22 pm

2 stops37h 12m

$454

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 2/3

6:10 am-8:10 am

2 stops19h 00m

Lisbon Humberto Delgado

Tue 2/10

10:15 am-10:57 pm

2 stops19h 42m

$462

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 2/18

6:00 am-5:40 pm

2 stops27h 40m

Lisbon Humberto Delgado

Wed 2/25

8:45 pm-9:12 pm

2 stops32h 27m

$463

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 4/14

1:53 pm-8:05 pm

2 stops23h 12m

Lisbon Humberto Delgado

Tue 4/28

8:45 pm-9:07 pm

2 stops31h 22m

$479

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 4/21

6:00 am-6:25 pm

2 stops28h 25m

Lisbon Humberto Delgado

Tue 4/28

8:45 pm-8:28 pm

2 stops31h 43m

$479

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 4/14

6:00 am-6:25 pm

2 stops28h 25m

Lisbon Humberto Delgado

Tue 4/28

8:45 pm-8:28 pm

2 stops31h 43m

$479

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Thu 2/19

5:00 am-7:55 am

2 stops18h 55m

Lisbon Humberto Delgado

Thu 2/26

11:20 am-11:00 pm

2 stops43h 40m

$490

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 3/23

10:49 am-11:30 pm

2 stops30h 41m

Lisbon Humberto Delgado

Wed 4/1

6:15 am-9:54 am

2 stops34h 39m

$492

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 2/18

12:38 pm-10:15 am

3 stops37h 37m

Lisbon Humberto Delgado

Wed 2/25

5:00 am-3:16 pm

2 stops42h 16m

$499

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Showing 1-10 of 36 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 $462, Finnair can have you in Portugal from Idaho in 19h. 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 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$549Average$1,052FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$601Average$902FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$602Average$1,135FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$621Average$1,248FlexibilityNo cancel feeOn-time71%

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