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Portugal

$387+ 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Jun 22 — Jun 291
Mon 6/22
Mon 6/29
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 May 23, 2026.

This Air Canada deal was found by Cheapflights users on 5/19. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/197:05 pm
BOI
-
LIS
2 stops31h 15m
Air Canada
Tue 11/31:00 pm
LIS
-
BOI
2 stops34h 49m
Air Canada
Deal found 5/19$726
This United Airlines deal was found by Cheapflights users on 5/22. 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 11/165:00 am
GEG
-
LIS
2 stops20h 50m
United Airlines
Thu 11/191:00 pm
LIS
-
GEG
2 stops40h 09m
United Airlines
Deal found 5/22$726
This United Airlines deal was found by Cheapflights users on 5/19. 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 11/27:00 am
BOI
-
LIS
2 stops20h 15m
United Airlines
Thu 11/51:00 pm
LIS
-
BOI
2 stops39h 15m
United Airlines
Deal found 5/19$727
This United Airlines deal was found by Cheapflights users on 5/19. 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.
Sun 12/65:00 am
GEG
-
LIS
2 stops19h 10m
United Airlines
Thu 12/101:00 pm
LIS
-
GEG
2 stops40h 09m
United Airlines
Deal found 5/19$727
This United Airlines deal was found by Cheapflights users on 5/18. 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 12/53:30 pm
JAC
-
LIS
2 stops33h 40m
United Airlines
Tue 12/81:00 pm
LIS
-
JAC
2 stops31h 29m
United Airlines
Deal found 5/18$728
This United Airlines deal was found by Cheapflights users on 5/18. 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 12/295:00 am
GEG
-
LIS
2 stops19h 10m
United Airlines
Fri 1/81:00 pm
LIS
-
GEG
2 stops34h 19m
United Airlines
Deal found 5/18$728
This United Airlines deal was found by Cheapflights users on 5/19. 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.
Sun 10/186:25 am
BOI
-
LIS
2 stops18h 55m
United Airlines
Tue 11/35:00 am
LIS
-
BOI
2 stops25h 59m
United Airlines
Deal found 5/19$730
This Air Canada deal was found by Cheapflights users on 5/19. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/245:44 pm
BOI
-
LIS
2 stops35h 16m
Air Canada
Tue 11/31:00 pm
LIS
-
BOI
2 stops37h 16m
Air Canada
Deal found 5/19$736
This United Airlines deal was found by Cheapflights users on 5/22. 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 11/167:00 am
BOI
-
LIS
2 stops20h 15m
United Airlines
Thu 11/1910:15 am
LIS
-
BOI
2 stops18h 01m
United Airlines
Deal found 5/22$743
This FlightHub deal was found by Cheapflights users on 5/22. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/812:42 pm
BOI
-
LIS
2 stops27h 33m
Scandinavian Airlines
Sat 9/1910:55 pm
LIS
-
BOI
2 stops28h 23m
Scandinavian Airlines
Deal found 5/22$769
This Air Canada deal was found by Cheapflights users on 5/19. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:25 am
BOI
-
LIS
2 stops21h 40m
Air Canada
Mon 11/21:00 pm
LIS
-
BOI
2 stops39h 16m
Air Canada
Deal found 5/19$781
This United Airlines deal was found by Cheapflights users on 5/21. 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.
Tue 10/205:00 am
BOI
-
LIS
2 stops21h 20m
United Airlines
Fri 10/301:00 pm
LIS
-
BOI
2 stops40h 05m
United Airlines
Deal found 5/21$782

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 May 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$726
(Air Canada)

One-way from

$387
(American Airlines)

Popular in

December

Cheapest in

February

Average price

$952
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. 37% potential increase in price ($625 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 19% potential price decrease ($166 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 23, 2026.
Use the filters below to find and compare flights from Idaho to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Mon 11/16

5:00 am-9:50 am

2 stops20h 50m

Lisbon Humberto Delgado

Thu 11/19

1:00 pm-9:09 pm

2 stops40h 09m

$726

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 11/2

7:00 am-10:15 am

2 stops20h 15m

Lisbon Humberto Delgado

Thu 11/5

1:00 pm-9:15 pm

2 stops39h 15m

$727

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 11/16

7:00 am-10:15 am

2 stops20h 15m

Lisbon Humberto Delgado

Thu 11/19

10:15 am-9:16 pm

2 stops18h 01m

$743

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 10/18

6:25 am-8:20 am

2 stops18h 55m

Lisbon Humberto Delgado

Fri 10/30

1:00 pm-1:30 pm

2 stops30h 30m

$783

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 9/8

10:23 am-11:15 pm

2 stops29h 52m

Lisbon Humberto Delgado

Sat 9/19

10:55 pm-8:18 pm

2 stops28h 23m

$789

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 10/18

11:30 pm-8:00 am

2 stops25h 30m

Lisbon Humberto Delgado

Sun 11/1

10:00 am-10:41 pm

2 stops19h 41m

$793

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 10/24

4:05 pm-10:00 am

2 stops34h 55m

Lisbon Humberto Delgado

Wed 10/28

5:00 am-6:33 pm

2 stops19h 33m

$799

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 10/22

8:40 am-11:15 am

2 stops19h 35m

Lisbon Humberto Delgado

Sun 11/1

5:30 am-12:52 am

2 stops25h 22m

$838

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Fri 10/23

4:05 pm-6:45 pm

2 stops19h 40m

Lisbon Humberto Delgado

Wed 10/28

5:00 am-6:33 pm

2 stops19h 33m

$842

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 10/18

6:25 am-8:20 am

2 stops18h 55m

Lisbon Humberto Delgado

Sat 10/31

10:15 am-11:05 pm

2 stops18h 50m

$859

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/19

Showing 1-10 of 35 resultsSorted by cheapest first
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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
No data available for this route at this time. Please check back soon.

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 $727, United Airlines can have you in Portugal from Idaho in 18h 35m. 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.

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 2 airlines flying from Idaho to Portugal

Discover the top 2 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 May 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$549Average$833FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$601Average$975FlexibilityNo cancel feeOn-time69%

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