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$648+ Cheap flights from Boise (BOI) to Portugal

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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Cheap flight deals from Boise to Portugal

Keep the following information in mind while searching for Boise to Portugal flight deals. Data was last updated April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$797
(United Airlines)

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.
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Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Lisbon Humberto Delgado flights.
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From Boise Air Term. Gowen Fld to Portugal
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Highest demand for flights based on searches. 17% potential increase in price ($225 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($36 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Find flight deals from Boise to Portugal

Cheapest flights from Boise to Portugal
Explore the most affordable flight options available from Boise to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.

This United Airlines deal was found by Cheapflights users on 4/17. 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.
Wed 11/1210:39 amBOI - LIS
2 stops16h 36mUnited Airlines
Tue 11/2511:55 amLIS - BOI
2 stops28h 48mUnited Airlines
Deal found 4/17$648
This Air Canada deal was found by Cheapflights users on 4/17. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/235:00 amBOI - LIS
2 stops45h 20mAir Canada
Sat 12/1311:00 amLIS - BOI
2 stops43h 05mAir Canada
Deal found 4/17$677
This Iberia deal was found by Cheapflights users on 4/16. 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 4/16$825
This FlightHub deal was found by Cheapflights users on 4/16. 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 9/123:05 pmBOI - LIS
2 stops34h 55mScandinavian Airlines
Thu 9/2512:10 pmLIS - BOI
2 stops37h 21mScandinavian Airlines
Deal found 4/16$1,037
This Air Canada deal was found by Cheapflights users on 4/16. 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 6/47:50 amBOI - LIS
2 stops18h 30mMultiple Airlines
Wed 6/1111:25 amLIS - BOI
3 stops18h 32mMultiple Airlines
Deal found 4/16$1,190

Cheapflights Fare Finder

Customize your flight search to find flights from Boise 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 17, 2025.
Use the filters below to find and compare flights from Boise to Portugal that are best for you.

Fly from

Boise

Fly to

Portugal

Route

Depart

Return

Price

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 5/12

7:10 pm-9:20 am

2 stops31h 10m

Lisbon Humberto Delgado

Tue 5/20

11:25 am-4:21 pm

2 stops35h 56m

$797

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

$825

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Fri 5/2

5:25 pm-9:20 am

2 stops56h 55m

Lisbon Humberto Delgado

Mon 5/12

11:25 am-12:14 pm

2 stops31h 49m

$857

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Fri 9/12

3:05 pm-9:00 am

2 stops34h 55m

Lisbon Humberto Delgado

Thu 9/25

12:10 pm-6:31 pm

2 stops37h 21m

$1,037

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Wed 6/4

7:50 am-9:20 am

2 stops18h 30m

Lisbon Humberto Delgado

Wed 6/11

11:25 am-10:57 pm

3 stops18h 32m

$1,190

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Best time to book a flight from Boise to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal from Boise 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 Boise to Portugal

What is the cheapest month to book a flight from Boise to Portugal?

Currently, January is the cheapest month in which you can book a flight from Boise to Portugal (average of $612). Flying from Boise 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 BOI to PT?

Find hourly flight availability from Boise 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 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Boise 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 17, 2025.
United Airlines
7.4
Good
8,667 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.0

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
8,667 reviews
United Airlines
7.4
Good
8,667 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.0

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
1,335 reviews
United Airlines
7.4
Good
8,667 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.0

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
9,142 reviews
United Airlines
7.4
Good
8,667 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.0

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
2,676 reviews
United Airlines
7.4
Good
8,667 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.0

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 Boise to Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Boise to Portugal?

    If you book a flight to Portugal from Boise, you will be flying from Air Term. Gowen Fld, which is the city’s only airport. Boise Air Term. Gowen Fld (BOI) is located 3.3 mi from the center of Boise.

  • Can I find deals for flights from Boise to Portugal that include hotel bookings?

    Yes. In addition to deals on Boise to Portugal flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boise to Portugal?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boise to Portugal.

  • Can I find deals for business class flights from Boise to Portugal?

    Yes. Cheapflights offers flight deals from Boise 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 Boise to Portugal?

    Currently, January is the cheapest month in which you can book a flight from Boise to Portugal (average of $612). Flying from Boise 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

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Top 6 airlines flying from Boise to Portugal

Discover the top 6 airlines that operate flights from Boise 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 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$618Average$1,137FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$621Average$1,094FlexibilityNo cancel feeOn-time71%
Air FranceCheapest$654Average$1,042FlexibilityNo cancel feeOn-time77%
DeltaCheapest$654Average$1,186FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$701Average$1,135FlexibilityNo cancel feeOn-time67%
KLMCheapest$814Average$989FlexibilityNo cancel feeOn-time75%

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