HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portugal

$279+ 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Apr 29 — May 61
Tue 4/29
Tue 5/6
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

Keep the following information in mind while searching for Idaho to Portugal flight deals. Data was last updated April 24, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$675
(United)

One-way from

$279
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,059
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. 16% potential increase in price ($207 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find 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 April 24, 2025.

This United deal was found by Cheapflights users on 4/22. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/185:55 pmJAC - LIS
2 stops32h 25mMultiple Airlines
Mon 11/312:30 pmLIS - JAC
2 stops39h 32mMultiple Airlines
Deal found 4/22$675
This Air Canada deal was found by Cheapflights users on 4/23. 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 11/2310:39 amBOI - LIS
2 stops39h 41mAir Canada
Sat 12/1311:00 amLIS - BOI
2 stops41h 16mAir Canada
Deal found 4/23$678
This FlightHub deal was found by Cheapflights users on 4/23. 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.
Fri 10/243:05 pmBOI - LIS
2 stops43h 00mScandinavian Airlines
Mon 10/274:55 pmLIS - BOI
2 stops36h 25mScandinavian Airlines
Deal found 4/23$710
This United Airlines deal was found by Cheapflights users on 4/22. 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.
Sat 10/185:55 pmJAC - LIS
2 stops56h 25mUnited Airlines
Mon 11/35:00 amLIS - JAC
2 stops41h 12mUnited Airlines
Deal found 4/22$712
This Justfly.com deal was found by Cheapflights users on 4/23. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/245:15 amGEG - LIS
2 stops20h 05mAir Canada
Tue 10/711:25 amLIS - GEG
2 stops33h 11mAir Canada
Deal found 4/23$791
This Air Canada deal was found by Cheapflights users on 4/23. 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.
Fri 10/2410:45 amBOI - LIS
3 stops17h 20mMultiple Airlines
Mon 10/2711:00 amLIS - BOI
2 stops30h 37mMultiple Airlines
Deal found 4/23$857
This Iberia deal was found by Cheapflights users on 4/23. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/131:38 pmBOI - LIS
2 stops21h 47mIberia
Wed 5/216:35 amLIS - BOI
2 stops22h 25mIberia
Deal found 4/23$876
This United Airlines deal was found by Cheapflights users on 4/23. 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 5/132:00 pmBOI - LIS
2 stops36h 20mUnited Airlines
Wed 5/2110:25 amLIS - BOI
2 stops19h 27mUnited Airlines
Deal found 4/23$925
This Air Canada deal was found by Cheapflights users on 4/23. 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 9/2411:21 amGEG - LIS
3 stops23h 59mMultiple Airlines
Tue 10/712:55 pmLIS - GEG
2 stops30h 32mMultiple Airlines
Deal found 4/23$1,008
This United Airlines deal was found by Cheapflights users on 4/23. 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 7/45:30 amGEG - LIS
2 stops21h 00mUnited Airlines
Sat 7/129:50 amLIS - GEG
2 stops43h 13mUnited Airlines
Deal found 4/23$1,111
This British Airways deal was found by Cheapflights users on 4/23. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2110:45 amGEG - LIS
2 stops28h 25mBritish Airways
Mon 5/266:45 pmLIS - GEG
2 stops34h 26mBritish Airways
Deal found 4/23$1,231
This Lufthansa deal was found by Cheapflights users on 4/23. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/303:25 pmGEG - LIS
2 stops22h 25mLufthansa
Mon 6/162:25 pmLIS - GEG
2 stops38h 23mLufthansa
Deal found 4/23$2,210

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 April 24, 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

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Sat 10/18

5:55 pm-9:20 am

2 stops32h 25m

Lisbon Humberto Delgado

Mon 11/3

12:30 pm-9:02 pm

2 stops39h 32m

$675

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Sat 10/18

5:55 pm-9:20 am

2 stops56h 25m

Lisbon Humberto Delgado

Mon 11/3

5:00 am-3:12 pm

2 stops41h 12m

$712

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 9/24

5:15 am-9:20 am

2 stops20h 05m

Lisbon Humberto Delgado

Tue 10/7

11:25 am-12:36 pm

2 stops33h 11m

$791

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 5/13

1:38 pm-6:25 pm

2 stops21h 47m

Lisbon Humberto Delgado

Wed 5/21

6:35 am-10:00 pm

2 stops22h 25m

$876

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 5/13

2:00 pm-9:20 am

2 stops36h 20m

Lisbon Humberto Delgado

Wed 5/21

10:25 am-10:52 pm

2 stops19h 27m

$925

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 9/24

11:21 am-7:20 pm

3 stops23h 59m

Lisbon Humberto Delgado

Tue 10/7

12:55 pm-11:27 am

2 stops30h 32m

$1,008

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 5/17

5:25 pm-9:20 am

2 stops56h 55m

Lisbon Humberto Delgado

Sun 6/8

1:10 pm-10:52 pm

2 stops40h 42m

$1,053

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 7/4

5:30 am-10:30 am

2 stops21h 00m

Lisbon Humberto Delgado

Sat 7/12

9:50 am-9:03 pm

2 stops43h 13m

$1,111

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 5/13

8:30 am-11:05 am

2 stops19h 35m

Lisbon Humberto Delgado

Wed 5/21

11:25 am-9:46 am

3 stops29h 21m

$1,119

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 5/21

10:45 am-11:10 pm

2 stops28h 25m

Lisbon Humberto Delgado

Mon 5/26

6:45 pm-9:11 pm

2 stops34h 26m

$1,231

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

Showing 1-10 of 15 results
1
2

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, January is the cheapest month in which you can book a flight from Idaho to Portugal (average of $612). Flying from Idaho to Portugal in June is currently the most expensive (average of $1,203). 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.

What is the cheapest time of day to fly from ID to PT?

Find hourly flight availability from Idaho to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 24, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to Portugal as you normally would.

Rainfall in Portugal by month

Plan your trip to Portugal by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Portugal ranges from 0.2 - 4.8 inches per month. December is typically the wettest month, when rainfall can reach 4.8 in. July is typically the driest time to visit Portugal when rainfall is around 0.2 in.

Temperature in Portugal by month

Plan your trip to Portugal by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Portugal, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portugal. Reviews last updated April 24, 2025.
To help decide which airline to fly from Idaho to Portugal, see what other customers have to say about United Airlines, Scandinavian Airlines and American Airlines. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,685 reviews

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,685 reviews
United Airlines
7.4
Good
8,685 reviews

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Scandinavian Airlines
7.3
Good
1,344 reviews
United Airlines
7.4
Good
8,685 reviews

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,685 reviews

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Air Canada
7.0
Good
9,192 reviews
United Airlines
7.4
Good
8,685 reviews

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Iberia
7.0
Good
2,684 reviews
United Airlines
7.4
Good
8,685 reviews

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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.

  • 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, January is the cheapest month in which you can book a flight from Idaho to Portugal (average of $612). Flying from Idaho to Portugal in June is currently the most expensive (average of $1,203). 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
John F Kennedy Intl to Charles de Gaulle flights
Newark to Heathrow flights
John F Kennedy Intl to Leonardo da Vinci/Fiumicino flights
Newark to Charles de Gaulle flights
John F Kennedy Intl to Gatwick flights
Newark to Leonardo da Vinci/Fiumicino flights
Newark to Athens flights
John F Kennedy Intl to Lisbon flights
LaGuardia to Heathrow flights
Dulles Intl to Heathrow flights
John F Kennedy Intl to Istanbul flights
John F Kennedy Intl to Orly flights
John F Kennedy Intl to London City flights
Newark to Lisbon flights
Newark to Orly flights
Boston to Heathrow flights
John F Kennedy Intl to Barcelona-El Prat flights
Newark to Gatwick flights
John F Kennedy Intl to Athens flights
Newark to Barcelona-El Prat flights
San Francisco to Heathrow flights
LaGuardia to Charles de Gaulle flights
Miami to Madrid flights
Los Angeles to Heathrow flights
O'Hare Intl to Heathrow flights
O'Hare Intl to Leonardo da Vinci/Fiumicino flights
Baltimore to Heathrow flights
John F Kennedy Intl to Madrid flights
John F Kennedy Intl to Malpensa flights
Seattle to Heathrow flights
LaGuardia to Leonardo da Vinci/Fiumicino flights
Newark to Madrid flights
Dulles Intl to Charles de Gaulle flights
O'Hare Intl to Charles de Gaulle flights
Newark to Dublin flights
Newark to Malpensa flights
Dallas/Fort Worth to Heathrow flights
John F Kennedy Intl to Dublin flights
O'Hare Intl to Athens flights
Dulles Intl to Leonardo da Vinci/Fiumicino flights
Boston to Leonardo da Vinci/Fiumicino flights
Boston to Charles de Gaulle flights
Dallas/Fort Worth to Charles de Gaulle flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
Boston to Athens flights
Atlanta to Heathrow flights
LaGuardia to Gatwick flights
LaGuardia to Athens flights
Newark to London City flights

Top 6 airlines flying from Idaho to Portugal

Discover the top 6 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 April 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$618Average$1,355FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$621Average$1,094FlexibilityNo cancel feeOn-time71%
Air FranceCheapest$654Average$1,042FlexibilityNo cancel feeOn-time77%
DeltaCheapest$654Average$1,175FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$701Average$1,135FlexibilityNo cancel feeOn-time67%
KLMCheapest$814Average$989FlexibilityNo cancel feeOn-time75%

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.