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Portugal

$331+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Aug 8 — Aug 151
Sat 8/8
Sat 8/15
1 adult, Economy
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Cheap 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 July 9, 2026.

This United Airlines deal was found by Cheapflights users on 7/7. 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.
Tue 12/17:00 am
JAC
-
LIS
2 stops18h 10m
United Airlines
Thu 12/310:55 am
LIS
-
JAC
2 stops41h 07m
United Airlines
Deal found 7/7$726
This United Airlines deal was found by Cheapflights users on 7/7. 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.
Sun 12/69:40 am
BOI
-
LIS
2 stops15h 30m
United Airlines
Wed 12/911:20 am
LIS
-
BOI
2 stops40h 56m
United Airlines
Deal found 7/7$726
This United Airlines deal was found by Cheapflights users on 7/6. 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.
Sun 11/14:03 pm
GEG
-
LIS
2 stops32h 07m
United Airlines
Wed 11/1111:20 am
LIS
-
GEG
2 stops41h 45m
United Airlines
Deal found 7/6$726
This United deal was found by Cheapflights users on 7/5. 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.
Fri 11/64:25 pm
JAC
-
LIS
2 stops57h 55m
Multiple Airlines
Fri 11/135:00 am
LIS
-
JAC
2 stops23h 02m
Multiple Airlines
Deal found 7/5$738
This United Airlines deal was found by Cheapflights users on 7/8. 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.
Wed 10/215:00 am
BOI
-
LIS
2 stops21h 20m
United Airlines
Thu 10/2910:55 am
LIS
-
BOI
2 stops40h 35m
United Airlines
Deal found 7/8$770
This United Airlines deal was found by Cheapflights users on 7/5. 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 11/610:51 am
JAC
-
LIS
2 stops16h 29m
United Airlines
Fri 11/135:00 am
LIS
-
JAC
3 stops23h 02m
United Airlines
Deal found 7/5$779
This United Airlines deal was found by Cheapflights users on 7/7. 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.
Tue 12/295:00 am
GEG
-
LIS
2 stops19h 10m
United Airlines
Fri 1/85:00 am
LIS
-
GEG
2 stops24h 09m
United Airlines
Deal found 7/7$786
This United deal was found by Cheapflights users on 7/8. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:25 pm
JAC
-
LIS
2 stops58h 55m
Multiple Airlines
Sat 11/75:00 am
LIS
-
JAC
2 stops23h 02m
Multiple Airlines
Deal found 7/8$788
This Air Canada deal was found by Cheapflights users on 7/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2110:30 am
BOI
-
LIS
3 stops17h 35m
Multiple Airlines
Thu 10/298:55 am
LIS
-
BOI
2 stops30h 43m
Multiple Airlines
Deal found 7/8$798
This Air Canada deal was found by Cheapflights users on 7/7. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/76:30 am
BOI
-
LIS
2 stops19h 10m
Multiple Airlines
Wed 11/1111:20 am
LIS
-
BOI
3 stops29h 18m
Multiple Airlines
Deal found 7/7$818
This Delta deal was found by Cheapflights users on 7/8. 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.
Wed 10/1410:34 am
BOI
-
LIS
2 stops24h 16m
Delta
Sat 10/245:00 am
LIS
-
BOI
2 stops20h 33m
Delta
Deal found 7/8$835
This United Airlines deal was found by Cheapflights users on 7/9. 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.
Thu 11/197:00 am
JAC
-
LIS
2 stops23h 20m
United Airlines
Mon 11/3012:25 pm
LIS
-
JAC
2 stops39h 37m
United Airlines
Deal found 7/9$848

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 July 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$726
(United Airlines)

One-way from

$331
(American Airlines)

Popular in

December

Cheapest in

November
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. 37% potential increase in price ($618 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 21% potential price decrease ($183 potential savings vs. average RT price).
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 July 9, 2026.
Use the filters below to find and compare flights from Idaho to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Tue 12/1

7:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Thu 12/3

10:55 am-9:02 pm

2 stops41h 07m

$726

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 12/6

5:22 pm-8:10 am

2 stops31h 48m

Lisbon Humberto Delgado

Wed 12/9

11:20 am-9:16 pm

2 stops40h 56m

$726

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Fri 11/6

4:25 pm-9:20 am

2 stops57h 55m

Lisbon Humberto Delgado

Fri 11/13

5:00 am-9:02 pm

2 stops23h 02m

$738

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Thu 11/19

7:00 am-1:20 pm

2 stops23h 20m

Lisbon Humberto Delgado

Mon 11/30

12:25 pm-9:02 pm

2 stops39h 37m

$848

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 10/15

8:22 am-11:15 am

2 stops19h 53m

Lisbon Humberto Delgado

Sat 10/24

5:00 am-6:33 pm

2 stops20h 33m

$885

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 8/18

11:09 am-11:15 am

2 stops16h 06m

Lisbon Humberto Delgado

Tue 8/25

5:00 am-9:33 pm

2 stops24h 33m

$888

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Tue 9/1

8:05 am-9:20 am

2 stops18h 15m

Lisbon Humberto Delgado

Wed 9/16

11:25 am-5:49 pm

2 stops37h 24m

$928

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 8/30

6:30 am-9:20 am

2 stops19h 50m

Lisbon Humberto Delgado

Thu 9/10

11:25 am-11:26 am

2 stops31h 01m

$928

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 9/1

5:00 am-9:20 am

2 stops20h 20m

Lisbon Humberto Delgado

Tue 9/15

11:25 am-9:14 pm

2 stops41h 49m

$928

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Wed 9/2

3:38 pm-3:40 pm

2 stops17h 02m

Lisbon Humberto Delgado

Thu 9/10

11:05 am-12:07 pm

2 stops32h 02m

$946

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/6

Showing 1-10 of 40 resultsSorted by cheapest first
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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
No data available for this route at this time. Please check back soon.

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 $726, United Airlines can have you in Portugal from Idaho in 18h 10m. Airlines will cover a distance of 4932 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.

See more FAQs

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Alternative routes for Idaho to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Idaho to Portugal

Discover the top 2 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 July 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$549Average$827FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$618Average$885FlexibilityNo cancel feeOn-time69%

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