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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
Mar 4 — Mar 111
Wed 3/4
Wed 3/11
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 February 2, 2026.

This United Airlines deal was found by Cheapflights users on 2/1. 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 3/37:00 am
GEG
-
LIS
2 stops17h 10m
United Airlines
Tue 3/105:00 am
LIS
-
GEG
2 stops23h 03m
United Airlines
Deal found 2/1$497
This United Airlines deal was found by Cheapflights users on 2/1. 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.
Fri 10/237:02 am
GEG
-
LIS
2 stops43h 18m
United Airlines
Fri 11/65:00 am
LIS
-
GEG
2 stops24h 09m
United Airlines
Deal found 2/1$500
This Delta deal was found by Cheapflights users on 2/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1410:41 am
BOI
-
LIS
2 stops24h 09m
Delta
Tue 4/285:00 am
LIS
-
BOI
2 stops25h 00m
Delta
Deal found 2/2$503
This Delta deal was found by Cheapflights users on 1/31. 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 4/143:30 pm
GEG
-
LIS
2 stops18h 20m
Delta
Tue 4/2810:00 am
LIS
-
GEG
2 stops22h 20m
Delta
Deal found 1/31$517
This United Airlines deal was found by Cheapflights users on 2/1. 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 10/135:00 am
BOI
-
LIS
2 stops21h 20m
United Airlines
Wed 10/286:10 am
LIS
-
BOI
2 stops21h 05m
United Airlines
Deal found 2/1$582
This KLM deal was found by Cheapflights users on 2/1. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/243:30 pm
GEG
-
LIS
2 stops18h 20m
Multiple Airlines
Sat 5/98:55 am
LIS
-
GEG
2 stops20h 18m
Multiple Airlines
Deal found 2/1$591
This United Airlines deal was found by Cheapflights users on 1/31. 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 2/225:00 am
BOI
-
LIS
2 stops22h 15m
United Airlines
Mon 3/95:00 am
LIS
-
BOI
2 stops61h 13m
United Airlines
Deal found 1/31$593
This United Airlines deal was found by Cheapflights users on 1/31. 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 3/182:40 pm
BOI
-
LIS
2 stops37h 35m
United Airlines
Wed 3/255:00 am
LIS
-
BOI
2 stops24h 57m
United Airlines
Deal found 1/31$597
This Finnair deal was found by Cheapflights users on 2/2. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/46:44 am
BOI
-
LIS
2 stops26h 06m
Finnair
Mon 5/114:35 pm
LIS
-
BOI
2 stops37h 03m
Finnair
Deal found 2/2$598
This Finnair deal was found by Cheapflights users on 2/1. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:44 am
BOI
-
LIS
2 stops26h 06m
Multiple Airlines
Wed 5/137:20 am
LIS
-
BOI
2 stops22h 18m
Multiple Airlines
Deal found 2/1$618
This United Airlines deal was found by Cheapflights users on 2/1. 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 3/246:15 am
BOI
-
LIS
2 stops26h 15m
United Airlines
Thu 4/212:20 pm
LIS
-
BOI
2 stops32h 11m
United Airlines
Deal found 2/1$621
This KAYAK deal was found by Cheapflights users on 1/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:00 am
GEG
-
LIS
2 stops30h 55m
Lufthansa
Sat 5/96:15 am
LIS
-
GEG
2 stops23h 01m
Lufthansa
Deal found 1/30$626

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 February 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$497
(United Airlines)

One-way from

$349
(United Airlines)

Popular in

December

Cheapest in

November

Average price

$677
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 ($312 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 February 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 February 2, 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

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 3/3

7:00 am-8:10 am

2 stops17h 10m

Lisbon Humberto Delgado

Tue 3/10

5:00 am-9:03 pm

2 stops23h 03m

$497

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 4/14

3:44 pm-5:50 pm

2 stops19h 06m

Lisbon Humberto Delgado

Tue 4/28

5:00 am-11:00 pm

2 stops25h 00m

$503

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 4/14

3:30 pm-5:50 pm

2 stops18h 20m

Lisbon Humberto Delgado

Tue 4/28

10:00 am-12:20 am

2 stops22h 20m

$517

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 4/24

3:30 pm-5:50 pm

2 stops18h 20m

Lisbon Humberto Delgado

Sat 5/9

8:55 am-9:13 pm

2 stops20h 18m

$591

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 2/22

5:00 am-10:15 am

2 stops22h 15m

Lisbon Humberto Delgado

Mon 3/9

5:00 am-12:13 pm

2 stops61h 13m

$593

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Wed 3/18

2:40 pm-10:15 am

2 stops37h 35m

Lisbon Humberto Delgado

Wed 3/25

5:00 am-11:57 pm

2 stops24h 57m

$597

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 5/4

6:44 am-3:50 pm

2 stops26h 06m

Lisbon Humberto Delgado

Mon 5/11

4:35 pm-10:38 pm

2 stops37h 03m

$598

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 3/24

6:15 am-2:30 pm

2 stops26h 15m

Lisbon Humberto Delgado

Thu 4/2

12:20 pm-1:31 pm

2 stops32h 11m

$621

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Wed 2/25

10:25 am-10:15 am

2 stops16h 50m

Lisbon Humberto Delgado

Sun 3/1

11:55 am-10:12 am

2 stops29h 17m

$628

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 2/25

7:00 am-8:10 am

2 stops17h 10m

Lisbon Humberto Delgado

Sun 3/1

11:55 am-11:45 am

2 stops31h 50m

$628

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/1

Showing 1-10 of 51 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 $484). 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 $497, United Airlines can have you in Portugal from Idaho in 17h 10m. 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.

  • 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 $484). 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

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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Top 3 airlines flying from Idaho to Portugal

Discover the top 3 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 February 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$549Average$1,080FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$589Average$986FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$602Average$1,135FlexibilityNo cancel feeOn-time67%

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