HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portugal

$297+ Cheap flights from Boise (BOI) 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 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Mar 26 — Apr 21
Thu 3/26
Thu 4/2
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Boise 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 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 February 24, 2026.

This United Airlines deal was found by Cheapflights users on 2/23. 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.
Thu 11/127:00 am
BOI
-
LIS
2 stops20h 15m
United Airlines
Wed 11/185:00 am
LIS
-
BOI
2 stops19h 55m
United Airlines
Deal found 2/23$500
This United Airlines deal was found by Cheapflights users on 2/23. 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.
Sun 11/110:39 am
BOI
-
LIS
2 stops39h 41m
United Airlines
Sun 11/811:20 am
LIS
-
BOI
2 stops40h 56m
United Airlines
Deal found 2/23$501
This Delta deal was found by Cheapflights users on 2/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:52 pm
BOI
-
LIS
2 stops20h 58m
Delta
Tue 4/285:00 am
LIS
-
BOI
2 stops25h 00m
Delta
Deal found 2/23$502
This United Airlines deal was found by Cheapflights users on 2/22. 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.
Wed 4/87:03 pm
BOI
-
LIS
2 stops37h 22m
United Airlines
Wed 4/157:25 am
LIS
-
BOI
2 stops38h 59m
United Airlines
Deal found 2/22$516
This United Airlines deal was found by Cheapflights users on 2/22. 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.
Sun 4/196:15 am
BOI
-
LIS
2 stops33h 30m
United Airlines
Thu 4/3012:20 pm
LIS
-
BOI
2 stops28h 34m
United Airlines
Deal found 2/22$520
This Iberia deal was found by Cheapflights users on 2/23. 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.
Wed 3/47:00 am
BOI
-
LIS
2 stops22h 10m
Multiple Airlines
Wed 3/116:45 pm
LIS
-
BOI
2 stops24h 03m
Multiple Airlines
Deal found 2/23$563
This Delta deal was found by Cheapflights users on 2/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/48:50 am
BOI
-
LIS
2 stops23h 20m
Delta
Wed 3/115:00 am
LIS
-
BOI
2 stops19h 42m
Delta
Deal found 2/23$568
This American Airlines deal was found by Cheapflights users on 2/21. 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.
Wed 3/47:00 am
BOI
-
LIS
2 stops18h 55m
American Airlines
Wed 3/118:45 pm
LIS
-
BOI
2 stops22h 03m
American Airlines
Deal found 2/21$570
This Delta deal was found by Cheapflights users on 2/20. 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 4/161:52 pm
BOI
-
LIS
2 stops20h 58m
Delta
Tue 4/285:00 am
LIS
-
BOI
2 stops25h 00m
Delta
Deal found 2/20$590
This Delta deal was found by Cheapflights users on 2/20. 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 4/181:52 pm
BOI
-
LIS
2 stops20h 58m
Delta
Thu 4/305:35 am
LIS
-
BOI
2 stops23h 49m
Delta
Deal found 2/20$596
This Delta deal was found by Cheapflights users on 2/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/228:30 am
BOI
-
LIS
2 stops23h 25m
Delta
Wed 5/135:00 am
LIS
-
BOI
2 stops22h 34m
Delta
Deal found 2/23$668

Find flight deals from Boise to Portugal

Keep the following information in mind while searching for Boise to Portugal flight deals. Data was last updated February 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$502
(Delta)

One-way from

$420
(Air France)

Popular in

December

Cheapest in

November

Average price

$688
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 Boise Air Term. Gowen Fld to Portugal
Search Deals
One-way flight from Boise Air Term. Gowen Fld to Portugal
Search Deals
Highest demand for flights based on searches. 32% potential increase in price ($544 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 16% potential price decrease ($157 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 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 February 24, 2026.
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

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

$502

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 4/16

1:52 pm-5:50 pm

2 stops20h 58m

Lisbon Humberto Delgado

Tue 4/28

5:00 am-11:00 pm

2 stops25h 00m

$590

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 4/18

1:52 pm-5:50 pm

2 stops20h 58m

Lisbon Humberto Delgado

Thu 4/30

5:35 am-10:24 pm

2 stops23h 49m

$596

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Wed 4/22

8:30 am-2:35 pm

2 stops23h 05m

Lisbon Humberto Delgado

Wed 5/13

5:00 am-10:13 pm

2 stops24h 13m

$673

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Fri 4/10

1:53 pm-11:25 pm

2 stops26h 32m

Lisbon Humberto Delgado

Thu 4/16

4:35 pm-10:54 pm

2 stops37h 19m

$700

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Fri 4/10

12:45 pm-2:55 pm

2 stops19h 10m

Lisbon Humberto Delgado

Fri 4/17

5:35 am-11:00 pm

2 stops24h 25m

$759

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 6/2

12:51 pm-2:35 pm

2 stops18h 44m

Lisbon Humberto Delgado

Tue 6/9

5:00 am-3:38 pm

2 stops17h 38m

$821

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 6/1

12:38 pm-11:00 am

2 stops39h 22m

Lisbon Humberto Delgado

Wed 6/10

1:00 pm-4:44 pm

2 stops34h 44m

$916

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 4/19

6:00 am-9:05 pm

3 stops32h 05m

$297

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Tue 3/24

12:45 pm-11:20 am

2 stops16h 35m

$420

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/24

Showing 1-10 of 16 results
1
2

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
No data available for this route at this time. Please check back soon.

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 February 24, 2026.
Get a feel of what it's like to fly with Delta and United Airlines from Boise to Portugal by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,239 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,239 reviews
Delta
7.9
Good
8,239 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,344 reviews
Delta
7.9
Good
8,239 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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.

  • How long is the flight from Boise to Portugal?

    For as low as $502, Delta can have you in Portugal from Boise in 19h 06m. Airlines will cover a distance of 5150 mi.

  • 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.

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.

Top 2 airlines flying from Boise to Portugal

Discover the top 2 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 February 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$507Average$824FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$589Average$937FlexibilityNo cancel feeOn-time69%

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.
Site
©2026 Cheapflights