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Portugal

$356+ 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 11/21. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Jul 6 — Jul 131
Mon 7/6
Mon 7/13
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 June 6, 2026.

This United Airlines deal was found by Cheapflights users on 6/1. 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 10/266:20 am
BOI
-
LIS
2 stops21h 30m
United Airlines
Tue 11/101:00 pm
LIS
-
BOI
2 stops39h 16m
United Airlines
Deal found 6/1$726
This United Airlines deal was found by Cheapflights users on 6/1. 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 11/87:00 am
BOI
-
LIS
2 stops20h 15m
United Airlines
Tue 11/101:00 pm
LIS
-
BOI
2 stops37h 16m
United Airlines
Deal found 6/1$727
This American Airlines deal was found by Cheapflights users on 6/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/93:16 pm
GEG
-
LIS
2 stops19h 39m
Multiple Airlines
Fri 11/136:30 am
LIS
-
GEG
2 stops22h 25m
Multiple Airlines
Deal found 6/2$727
This Delta deal was found by Cheapflights users on 6/4. 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 11/157:00 am
GEG
-
LIS
2 stops17h 00m
Delta
Thu 12/35:00 am
LIS
-
GEG
2 stops26h 42m
Delta
Deal found 6/4$731
This Delta deal was found by Cheapflights users on 6/4. 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 11/1512:40 pm
GEG
-
LIS
2 stops18h 30m
Delta
Wed 12/212:20 pm
LIS
-
GEG
2 stops34h 25m
Delta
Deal found 6/4$751
This Air Canada deal was found by Cheapflights users on 6/4. 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.
Thu 11/197:02 am
GEG
-
LIS
2 stops19h 58m
Air Canada
Thu 12/31:00 pm
LIS
-
GEG
2 stops42h 38m
Air Canada
Deal found 6/4$781
This United Airlines deal was found by Cheapflights users on 6/1. 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 stops40h 09m
United Airlines
Deal found 6/1$783
This Air Canada deal was found by Cheapflights users on 6/4. 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 11/157:02 am
GEG
-
LIS
2 stops19h 58m
Air Canada
Tue 12/11:00 pm
LIS
-
GEG
2 stops42h 38m
Air Canada
Deal found 6/4$787
This Air Canada deal was found by Cheapflights users on 6/4. 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 11/217:02 am
GEG
-
LIS
2 stops43h 58m
Air Canada
Thu 12/31:00 pm
LIS
-
GEG
2 stops42h 38m
Air Canada
Deal found 6/4$792
This Air Canada deal was found by Cheapflights users on 6/4. 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.
Wed 11/185:00 am
GEG
-
LIS
2 stops22h 00m
Multiple Airlines
Tue 12/11:00 pm
LIS
-
GEG
3 stops31h 40m
Multiple Airlines
Deal found 6/4$815
This United Airlines deal was found by Cheapflights users on 6/4. 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 11/195:00 am
GEG
-
LIS
2 stops22h 00m
United Airlines
Tue 12/11:00 pm
LIS
-
GEG
2 stops34h 19m
United Airlines
Deal found 6/4$837
This Delta deal was found by Cheapflights users on 6/1. 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 10/110:35 am
BOI
-
LIS
2 stops24h 15m
Delta
Thu 11/195:00 am
LIS
-
BOI
2 stops17h 30m
Delta
Deal found 6/1$847

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 June 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$726
(United Airlines)

One-way from

$356
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$1,028
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 June 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 June 6, 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

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 10/26

6:20 am-9:50 am

2 stops21h 30m

Lisbon Humberto Delgado

Tue 11/10

1:00 pm-9:16 pm

2 stops39h 16m

$726

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 11/8

7:00 am-10:15 am

2 stops20h 15m

Lisbon Humberto Delgado

Tue 11/10

1:00 pm-7:16 pm

2 stops37h 16m

$727

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 11/17

6:30 am-9:00 am

2 stops18h 30m

Lisbon Humberto Delgado

Thu 12/3

5:00 am-9:05 pm

2 stops24h 05m

$731

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 10/1

10:35 am-5:50 pm

2 stops24h 15m

Lisbon Humberto Delgado

Thu 11/19

5:00 am-3:30 pm

2 stops17h 30m

$847

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 11/20

5:00 am-11:00 am

2 stops22h 00m

Lisbon Humberto Delgado

Fri 12/4

1:00 pm-3:19 pm

2 stops34h 19m

$847

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sat 8/1

4:08 pm-11:00 am

2 stops58h 52m

Lisbon Humberto Delgado

Tue 9/1

11:25 am-8:46 pm

2 stops41h 21m

$890
Quickest round-trip

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 10/15

4:05 pm-5:50 pm

2 stops18h 45m

Lisbon Humberto Delgado

Sat 10/24

5:00 am-6:33 pm

2 stops20h 33m

$897

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Thu 9/24

5:00 am-9:20 am

2 stops20h 20m

Lisbon Humberto Delgado

Wed 10/7

1:00 pm-8:53 pm

2 stops39h 53m

$898

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 10/9

5:00 am-11:05 am

2 stops46h 05m

Lisbon Humberto Delgado

Fri 10/23

11:25 am-3:05 pm

2 stops35h 40m

$898

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 10/8

5:00 am-9:20 am

2 stops21h 20m

Lisbon Humberto Delgado

Thu 10/15

5:05 am-5:58 pm

2 stops19h 53m

$902

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/6

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 $731, United Airlines can have you in Portugal from Idaho in 18h 30m. 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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O'Hare Intl to Heathrow flights
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John F Kennedy Intl to Frederic Chopin flights
O'Hare Intl to Leonardo da Vinci/Fiumicino flights
Newark to Frankfurt flights
Boston to Leonardo da Vinci/Fiumicino flights
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San Francisco to Charles de Gaulle flights

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 June 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$549Average$833FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$601Average$975FlexibilityNo cancel feeOn-time69%

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