HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portugal

$324+ 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 1/2. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Jan 27 — Feb 31
Tue 1/27
Tue 2/3
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Idaho to Portugal with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Idaho to Portugal

Best flights from Idaho to Portugal
Discover carefully curated flight deals from Idaho to Portugal that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 28, 2025.

This Booking.com deal was found by Cheapflights users on 12/28. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/197:00 amGEG - LIS
2 stops16h 55mMultiple Airlines
Fri 2/275:00 amLIS - GEG
2 stops24h 07mMultiple Airlines
Deal found 12/28$489
This United Airlines deal was found by Cheapflights users on 12/25. 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 1/236:10 amBOI - LIS
2 stops19h 00mUnited Airlines
Fri 1/3011:20 amLIS - BOI
2 stops39h 31mUnited Airlines
Deal found 12/25$495
This Orbitz deal was found by Cheapflights users on 12/25. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/236:10 amBOI - LIS
2 stops20h 10mAir Canada
Fri 1/3011:20 amLIS - BOI
2 stops33h 15mAir Canada
Deal found 12/25$497
This Delta deal was found by Cheapflights users on 12/27. 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 4/115:30 amBOI - LIS
2 stops22h 15mDelta
Tue 4/215:00 amLIS - BOI
2 stops18h 15mDelta
Deal found 12/27$500
This United Airlines deal was found by Cheapflights users on 12/26. 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 1/275:00 amGEG - LIS
2 stops19h 10mUnited Airlines
Wed 2/411:20 amLIS - GEG
2 stops42h 02mUnited Airlines
Deal found 12/26$495
This Delta deal was found by Cheapflights users on 12/27. 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 4/251:51 pmBOI - LIS
2 stops20h 59mDelta
Tue 5/55:00 amLIS - BOI
2 stops21h 21mDelta
Deal found 12/27$500
This Finnair deal was found by Cheapflights users on 12/27. 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.
Fri 4/246:12 amGEG - LIS
2 stops18h 53mMultiple Airlines
Sat 5/96:55 pmLIS - GEG
2 stops33h 39mMultiple Airlines
Deal found 12/27$530
This United Airlines deal was found by Cheapflights users on 12/25. 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 1/237:00 amJAC - LIS
2 stops18h 10mUnited Airlines
Tue 1/275:00 amLIS - JAC
2 stops35h 55mUnited Airlines
Deal found 12/25$499
This Delta deal was found by Cheapflights users on 12/27. 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 4/135:40 amBOI - LIS
2 stops19h 20mDelta
Thu 4/235:00 amLIS - BOI
2 stops18h 15mDelta
Deal found 12/27$500
This United Airlines deal was found by Cheapflights users on 12/26. 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 1/238:15 amBOI - LIS
2 stops16h 55mUnited Airlines
Tue 1/275:00 amLIS - BOI
2 stops23h 52mUnited Airlines
Deal found 12/26$499
This Delta deal was found by Cheapflights users on 12/27. 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.
Fri 1/239:15 amBOI - LIS
2 stops22h 55mDelta
Tue 1/275:00 amLIS - BOI
2 stops20h 28mDelta
Deal found 12/27$501
This United Airlines deal was found by Cheapflights users on 12/26. 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 1/235:00 amGEG - LIS
2 stops19h 10mUnited Airlines
Tue 1/275:00 amLIS - GEG
2 stops42h 21mUnited Airlines
Deal found 12/26$499
This Delta deal was found by Cheapflights users on 12/27. 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 4/181:51 pmBOI - LIS
2 stops21h 54mDelta
Wed 4/295:00 amLIS - BOI
2 stops18h 15mDelta
Deal found 12/27$505
This United Airlines deal was found by Cheapflights users on 12/27. 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 2/237:00 amGEG - LIS
2 stops19h 15mUnited Airlines
Sun 3/15:00 amLIS - GEG
2 stops25h 04mUnited Airlines
Deal found 12/27$499
This Delta deal was found by Cheapflights users on 12/27. 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.
Wed 4/1511:36 pmBOI - LIS
2 stops25h 24mDelta
Tue 4/285:35 amLIS - BOI
2 stops22h 50mDelta
Deal found 12/27$507
This Expedia deal was found by Cheapflights users on 12/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:00 amGEG - LIS
2 stops20h 20mMultiple Airlines
Mon 4/65:05 amLIS - GEG
2 stops21h 56mMultiple Airlines
Deal found 12/27$720
This Delta deal was found by Cheapflights users on 12/27. 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 4/1911:36 pmBOI - LIS
2 stops25h 24mDelta
Fri 5/112:45 pmLIS - BOI
2 stops18h 12mDelta
Deal found 12/27$511
This United Airlines deal was found by Cheapflights users on 12/25. 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 4/247:10 amGEG - LIS
2 stops30h 45mUnited Airlines
Sat 5/911:25 amLIS - GEG
2 stops42h 10mUnited Airlines
Deal found 12/25$530
This Delta deal was found by Cheapflights users on 12/27. 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 4/215:40 amBOI - LIS
2 stops19h 20mDelta
Fri 5/112:45 pmLIS - BOI
2 stops18h 12mDelta
Deal found 12/27$511
This KLM deal was found by Cheapflights users on 12/26. 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.
Sat 3/211:10 pmJAC - LIS
2 stops23h 30mMultiple Airlines
Sat 4/412:45 pmLIS - JAC
2 stops35h 02mMultiple Airlines
Deal found 12/26$778
This Delta deal was found by Cheapflights users on 12/26. 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 5/21:51 pmBOI - LIS
2 stops20h 59mDelta
Tue 5/125:00 amLIS - BOI
2 stops20h 35mDelta
Deal found 12/26$580
This United Airlines deal was found by Cheapflights users on 12/26. 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 3/295:05 amGEG - LIS
2 stops45h 55mUnited Airlines
Fri 4/105:05 amLIS - GEG
2 stops21h 46mUnited Airlines
Deal found 12/26$660
This United Airlines deal was found by Cheapflights users on 12/27. 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 3/217:00 amJAC - LIS
2 stops44h 20mUnited Airlines
Sat 4/411:25 amLIS - JAC
2 stops32h 56mUnited Airlines
Deal found 12/27$741
This Delta deal was found by Cheapflights users on 12/26. 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 3/293:25 pmGEG - LIS
2 stops18h 25mDelta
Thu 4/912:45 pmLIS - GEG
2 stops19h 18mDelta
Deal found 12/26$674
This United Airlines deal was found by Cheapflights users on 12/26. 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 4/48:30 amJAC - LIS
2 stops19h 05mUnited Airlines
Sun 6/281:00 pmLIS - JAC
2 stops52h 03mUnited Airlines
Deal found 12/26$976

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 December 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$489
(Booking.com)

One-way from

$324
(United Airlines)

Popular in

December

Cheapest in

November

Average price

$2,678
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. 20% potential increase in price ($298 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 14% potential price decrease ($142 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 28, 2025.
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

Thu 2/19

7:00 am-7:55 am

2 stops16h 55m

Lisbon Humberto Delgado

Fri 2/27

5:00 am-9:07 pm

2 stops24h 07m

$489

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Fri 1/23

6:10 am-8:10 am

2 stops19h 00m

Lisbon Humberto Delgado

Fri 1/30

11:20 am-7:51 pm

2 stops39h 31m

$495

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 1/27

5:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Wed 2/4

11:20 am-9:22 pm

2 stops42h 02m

$495

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Fri 1/23

6:10 am-9:20 am

2 stops20h 10m

Lisbon Humberto Delgado

Fri 1/30

11:20 am-1:35 pm

2 stops33h 15m

$497

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Fri 1/23

7:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Tue 1/27

5:00 am-9:55 am

2 stops35h 55m

$499

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Fri 1/23

8:15 am-8:10 am

2 stops16h 55m

Lisbon Humberto Delgado

Tue 1/27

5:00 am-9:52 pm

2 stops23h 52m

$499

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 1/23

5:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Tue 1/27

5:00 am-3:21 pm

2 stops42h 21m

$499

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Mon 2/23

7:00 am-10:15 am

2 stops19h 15m

Lisbon Humberto Delgado

Sun 3/1

5:00 am-10:04 pm

2 stops25h 04m

$499

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 4/11

5:30 am-10:45 am

2 stops22h 15m

Lisbon Humberto Delgado

Tue 4/21

5:00 am-4:15 pm

2 stops18h 15m

$500

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 4/25

1:51 pm-5:50 pm

2 stops20h 59m

Lisbon Humberto Delgado

Tue 5/5

5:00 am-7:21 pm

2 stops21h 21m

$500

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/27

Showing 1-10 of 36 results
1
2
3
4

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 $495, United Airlines 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Idaho to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Charles de Gaulle flights
Newark to Charles de Gaulle flights
John F Kennedy Intl to Leonardo da Vinci/Fiumicino flights
Newark to Leonardo da Vinci/Fiumicino flights
LaGuardia to Heathrow flights
John F Kennedy Intl to Istanbul flights
Boston to Heathrow flights
John F Kennedy Intl to London City flights
Newark to Orly flights
John F Kennedy Intl to Orly flights
Newark to Gatwick flights
John F Kennedy Intl to Lisbon flights
Dulles Intl to Heathrow flights
Miami to Madrid flights
Los Angeles to Heathrow flights
LaGuardia to Charles de Gaulle flights
John F Kennedy Intl to Gatwick flights
John F Kennedy Intl to Stansted flights
O'Hare Intl to Heathrow flights
Newark to Malpensa flights
Los Angeles to Charles de Gaulle flights
LaGuardia to Gatwick flights
O'Hare Intl to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Madrid flights
Dallas/Fort Worth to Heathrow flights
O'Hare Intl to Charles de Gaulle flights
Boston to Charles de Gaulle flights
Newark to Lisbon flights
Newark to Barcelona-El Prat flights
Dulles Intl to Charles de Gaulle flights
Newark to Dublin flights
Newark to Athens flights
John F Kennedy Intl to Barcelona-El Prat flights
San Francisco to Heathrow flights
Boston to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Amsterdam flights
Newark to Madrid flights
Dallas/Fort Worth to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Dublin flights
LaGuardia to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Malpensa flights
Dulles Intl to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Luton flights
Baltimore to Heathrow flights
San Francisco to Charles de Gaulle flights
John F Kennedy Intl to Athens flights
Newark to Frankfurt flights
Boston to Dublin flights

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 December 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$601Average$902FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$602Average$1,181FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$621Average$1,248FlexibilityNo cancel feeOn-time71%
DeltaCheapest$654Average$1,083FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.