HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portugal

$331+ 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 11/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
jul. 10 — jul. 171
vie. 7/10
vie. 7/17
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 junio 10, 2026.

This United Airlines deal was found by Cheapflights users on 6/7. 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.
lun. 12/77:00 am
BOI
-
LIS
2 stops20h 15m
United Airlines
jue. 12/101:00 pm
LIS
-
BOI
2 stops39h 16m
United Airlines
Deal found 6/7$727
This Expedia deal was found by Cheapflights users on 6/8. 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.
mar. 11/31:15 pm
BOI
-
LIS
2 stops18h 25m
KLM
dom. 11/153:35 pm
LIS
-
BOI
2 stops32h 14m
KLM
Deal found 6/8$771
This United Airlines deal was found by Cheapflights users on 6/6. 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.
dom. 11/15:22 pm
BOI
-
LIS
2 stops31h 48m
United Airlines
sáb. 11/141:00 pm
LIS
-
BOI
2 stops41h 59m
United Airlines
Deal found 6/6$777
This United Airlines deal was found by Cheapflights users on 6/8. 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.
dom. 12/277:00 am
BOI
-
LIS
2 stops21h 00m
United Airlines
sáb. 1/91:00 pm
LIS
-
BOI
2 stops39h 16m
United Airlines
Deal found 6/8$847
This Delta deal was found by Cheapflights users on 6/8. 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.
jue. 10/1510:38 am
BOI
-
LIS
2 stops21h 17m
Delta
sáb. 10/245:00 am
LIS
-
BOI
2 stops22h 17m
Delta
Deal found 6/8$897
This United Airlines deal was found by Cheapflights users on 6/7. 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.
jue. 10/85:00 am
BOI
-
LIS
2 stops21h 20m
United Airlines
jue. 10/155:05 am
LIS
-
BOI
2 stops19h 38m
United Airlines
Deal found 6/7$902
This Delta deal was found by Cheapflights users on 6/10. 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.
jue. 10/88:40 am
BOI
-
LIS
2 stops23h 15m
Delta
jue. 10/155:00 am
LIS
-
BOI
2 stops22h 17m
Delta
Deal found 6/10$903
This Orbitz deal was found by Cheapflights users on 6/8. 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.
vie. 9/117:05 pm
BOI
-
LIS
2 stops57h 00m
Air Canada
vie. 9/2511:25 am
LIS
-
BOI
2 stops29h 08m
Air Canada
Deal found 6/8$945
This Finnair deal was found by Cheapflights users on 6/9. 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.
mar. 8/253:16 pm
BOI
-
LIS
2 stops19h 39m
Multiple Airlines
lun. 9/74:35 pm
LIS
-
BOI
2 stops36h 36m
Multiple Airlines
Deal found 6/9$946
This United Airlines deal was found by Cheapflights users on 6/7. 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.
mar. 9/85:00 am
BOI
-
LIS
2 stops21h 20m
United Airlines
sáb. 9/1911:25 am
LIS
-
BOI
2 stops41h 12m
United Airlines
Deal found 6/7$966
This Air France deal was found by Cheapflights users on 6/10. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/83:30 pm
BOI
-
LIS
2 stops19h 20m
Multiple Airlines
sáb. 9/195:00 am
LIS
-
BOI
2 stops20h 40m
Multiple Airlines
Deal found 6/10$976
This United Airlines deal was found by Cheapflights users on 6/9. 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.
vie. 9/115:40 pm
BOI
-
LIS
2 stops31h 40m
United Airlines
vie. 9/2511:25 am
LIS
-
BOI
2 stops42h 33m
United Airlines
Deal found 6/9$977

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 junio 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$727
(United Airlines)

One-way from

$331
(American Airlines)

Popular in

December

Cheapest in

February

Average price

$916
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. 38% potential increase in price ($632 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 19% potential price decrease ($167 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 junio 10, 2026.
Use the filters below to find and compare flights from Boise to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

dom. 11/8

5:00 am-10:15 am

2 stops22h 15m

Lisbon Humberto Delgado

mar. 11/10

1:00 pm-4:49 pm

2 stops34h 49m

$727

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

lun. 12/7

7:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

jue. 12/10

1:00 pm-9:16 pm

2 stops39h 16m

$727

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

dom. 11/1

5:22 pm-8:10 am

2 stops31h 48m

Lisbon Humberto Delgado

sáb. 11/14

1:00 pm-11:59 pm

2 stops41h 59m

$777
Quickest round-trip

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

jue. 10/15

4:05 pm-5:50 pm

2 stops18h 45m

Lisbon Humberto Delgado

sáb. 10/24

5:00 am-6:33 pm

2 stops20h 33m

$897

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

jue. 10/8

5:00 am-9:20 am

2 stops21h 20m

Lisbon Humberto Delgado

jue. 10/15

5:05 am-5:43 pm

2 stops19h 38m

$902

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

mar. 9/8

5:00 am-9:20 am

2 stops21h 20m

Lisbon Humberto Delgado

sáb. 9/19

11:25 am-9:37 pm

2 stops41h 12m

$966

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

mar. 9/15

2:50 pm-5:50 pm

2 stops20h 00m

Lisbon Humberto Delgado

sáb. 9/26

5:35 am-10:59 pm

2 stops24h 24m

$984
Cheapest one-way

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

dom. 11/8

4:09 pm-5:45 pm

2 stops18h 36m

$331

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

vie. 8/28

5:44 pm-11:05 am

2 stops58h 21m

$483

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

jue. 7/9

3:10 pm-6:10 pm

2 stops20h 00m

$521

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/6

Showing 1-10 of 13 resultsSorted by cheapest first
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 junio 10, 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
8,396 reviews

Crew

8.5

Overall

7.9

Entertainment

7.8

Food

7.2

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.9
Good
8,396 reviews
Delta
7.9
Good
8,396 reviews

Crew

8.5

Overall

7.9

Entertainment

7.8

Food

7.2

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
9,804 reviews
Delta
7.9
Good
8,396 reviews

Crew

8.5

Overall

7.9

Entertainment

7.8

Food

7.2

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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 $727, United Airlines can have you in Portugal from Boise in 22h 15m. 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 junio 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$549Average$833FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$618Average$964FlexibilityNo 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.