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Portugal

$330+ 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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Aug 20 — Aug 271
Thu 8/20
Thu 8/27
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 July 21, 2026.

This United Airlines deal was found by Cheapflights users on 7/20. 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.
Mon 12/75:00 am
GEG
-
LIS
2 stops21h 40m
United Airlines
Thu 12/1010:55 am
LIS
-
GEG
2 stops42h 14m
United Airlines
Deal found 7/20$725
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Sun 12/69:40 am
BOI
-
LIS
2 stops15h 30m
United Airlines
Thu 12/1010:55 am
LIS
-
BOI
2 stops41h 21m
United Airlines
Deal found 7/20$726
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Sat 12/124:00 pm
GEG
-
LIS
2 stops32h 10m
United Airlines
Thu 12/175:00 am
LIS
-
GEG
2 stops25h 22m
United Airlines
Deal found 7/20$729
This Delta deal was found by Cheapflights users on 7/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/135:40 am
BOI
-
LIS
2 stops22h 40m
Delta
Mon 12/2111:30 am
LIS
-
BOI
2 stops56h 08m
Delta
Deal found 7/18$736
This Delta deal was found by Cheapflights users on 7/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/135:40 am
BOI
-
LIS
2 stops22h 40m
Delta
Tue 12/225:30 am
LIS
-
BOI
2 stops25h 24m
Delta
Deal found 7/18$737
This United Airlines deal was found by Cheapflights users on 7/19. 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.
Wed 10/287:00 am
JAC
-
LIS
2 stops17h 55m
United Airlines
Sun 11/1510:50 am
LIS
-
JAC
2 stops41h 12m
United Airlines
Deal found 7/19$775
This United Airlines deal was found by Cheapflights users on 7/17. 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 10/314:03 pm
GEG
-
LIS
2 stops35h 02m
United Airlines
Sat 11/711:20 am
LIS
-
GEG
2 stops41h 41m
United Airlines
Deal found 7/17$776
This United Airlines deal was found by Cheapflights users on 7/18. 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.
Wed 10/145:00 am
GEG
-
LIS
2 stops20h 20m
United Airlines
Fri 10/231:00 pm
LIS
-
GEG
2 stops39h 49m
United Airlines
Deal found 7/18$784
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Fri 10/304:25 pm
JAC
-
LIS
2 stops58h 55m
United Airlines
Sat 11/711:20 am
LIS
-
JAC
2 stops35h 23m
United Airlines
Deal found 7/20$785
This Delta deal was found by Cheapflights users on 7/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1210:05 am
GEG
-
LIS
2 stops21h 05m
Delta
Thu 12/175:30 am
LIS
-
GEG
2 stops21h 57m
Delta
Deal found 7/20$787
This Delta deal was found by Cheapflights users on 7/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/141:15 pm
BOI
-
LIS
2 stops21h 15m
Delta
Mon 12/2111:30 am
LIS
-
BOI
2 stops56h 08m
Delta
Deal found 7/18$792
This United Airlines deal was found by Cheapflights users on 7/20. 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 12/295:00 am
GEG
-
LIS
2 stops21h 05m
United Airlines
Fri 1/85:00 am
LIS
-
GEG
2 stops39h 18m
United Airlines
Deal found 7/20$792

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 July 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$725
(United Airlines)

One-way from

$330
(Travelocity)

Popular in

December

Cheapest in

November
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. 38% potential increase in price ($630 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 22% potential price decrease ($184 potential savings vs. average RT price).
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 July 21, 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 12/7

5:00 am-10:40 am

2 stops21h 40m

Lisbon Humberto Delgado

Thu 12/10

10:55 am-9:09 pm

2 stops42h 14m

$725

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 12/6

9:40 am-8:10 am

2 stops15h 30m

Lisbon Humberto Delgado

Thu 12/10

10:55 am-9:16 pm

2 stops41h 21m

$726

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 12/13

5:40 am-11:20 am

2 stops22h 40m

Lisbon Humberto Delgado

Mon 12/21

11:30 am-12:38 pm

2 stops56h 08m

$736

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sat 10/31

4:03 pm-10:05 am

2 stops35h 02m

Lisbon Humberto Delgado

Sat 11/7

11:20 am-9:01 pm

2 stops41h 41m

$776

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 10/14

5:00 am-9:20 am

2 stops20h 20m

Lisbon Humberto Delgado

Fri 10/23

1:00 pm-8:49 pm

2 stops39h 49m

$784

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 12/29

5:00 am-10:05 am

2 stops21h 05m

Lisbon Humberto Delgado

Fri 1/8

5:00 am-12:18 pm

2 stops39h 18m

$792

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sat 12/26

4:10 pm-8:10 am

2 stops32h 00m

Lisbon Humberto Delgado

Wed 1/6

11:20 am-11:38 pm

2 stops44h 18m

$793

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 12/15

9:40 am-8:55 am

2 stops40h 15m

Lisbon Humberto Delgado

Mon 12/21

5:00 am-9:15 pm

2 stops23h 15m

$839

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Tue 10/6

4:28 pm-11:05 am

2 stops35h 37m

Lisbon Humberto Delgado

Mon 10/19

1:00 pm-5:49 pm

2 stops35h 49m

$884

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 10/15

8:22 am-11:15 am

2 stops19h 53m

Lisbon Humberto Delgado

Sat 10/24

5:00 am-6:33 pm

2 stops20h 33m

$885

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/20

Showing 1-10 of 39 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 $725, United Airlines can have you in Portugal from Idaho in 21h 40m. 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

Browse thousands of different options on Cheapflights for your next trip

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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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LaGuardia to Gatwick flights
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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 July 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$467Average$896FlexibilityNo cancel feeOn-time69%
DeltaCheapest$549Average$827FlexibilityNo cancel feeOn-timeN/A

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