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Portugal

$396+ 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 4/20. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Apr 21 — Apr 281
Tue 4/21
Tue 4/28
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 March 22, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 3/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/204:23 pm
BOI
-
LIS
2 stops23h 47m
British Airways
Wed 4/296:45 pm
LIS
-
BOI
2 stops35h 17m
British Airways
Deal found 3/17$637
This United Airlines deal was found by Cheapflights users on 3/19. 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 11/35:00 am
GEG
-
LIS
2 stops20h 20m
United Airlines
Tue 11/105:00 am
LIS
-
GEG
2 stops26h 38m
United Airlines
Deal found 3/19$668
This United Airlines deal was found by Cheapflights users on 3/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/191:46 pm
GEG
-
LIS
2 stops48h 59m
United Airlines
Mon 5/41:00 pm
LIS
-
GEG
2 stops40h 16m
United Airlines
Deal found 3/21$669
This oojo deal was found by Cheapflights users on 3/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:08 pm
BOI
-
LIS
2 stops16h 52m
British Airways
Fri 5/86:55 pm
LIS
-
BOI
2 stops30h 39m
British Airways
Deal found 3/17$671
This United Airlines deal was found by Cheapflights users on 3/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/207:10 am
GEG
-
LIS
2 stops31h 35m
United Airlines
Wed 4/295:05 am
LIS
-
GEG
2 stops21h 46m
United Airlines
Deal found 3/20$672
This KAYAK deal was found by Cheapflights users on 3/20. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1812:35 pm
GEG
-
LIS
2 stops26h 10m
Lufthansa
Wed 4/296:15 am
LIS
-
GEG
2 stops22h 56m
Lufthansa
Deal found 3/20$673
This KLM deal was found by Cheapflights users on 3/22. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/195:10 pm
GEG
-
LIS
2 stops17h 35m
KLM
Mon 5/45:00 am
LIS
-
GEG
2 stops21h 57m
KLM
Deal found 3/22$674
This United Airlines deal was found by Cheapflights users on 3/19. 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 10/234:00 pm
GEG
-
LIS
2 stops58h 20m
United Airlines
Fri 11/611:20 am
LIS
-
GEG
2 stops33h 20m
United Airlines
Deal found 3/19$675
This United Airlines deal was found by Cheapflights users on 3/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/205:05 am
GEG
-
LIS
2 stops26h 25m
United Airlines
Fri 5/111:25 am
LIS
-
GEG
2 stops35h 53m
United Airlines
Deal found 3/20$676
This United Airlines deal was found by Cheapflights users on 3/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/65:00 am
GEG
-
LIS
2 stops19h 10m
United Airlines
Thu 12/105:00 am
LIS
-
GEG
2 stops26h 38m
United Airlines
Deal found 3/20$680
This United Airlines deal was found by Cheapflights users on 3/19. 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 12/62:43 pm
BOI
-
LIS
2 stops35h 37m
United Airlines
Wed 12/911:20 am
LIS
-
BOI
2 stops40h 55m
United Airlines
Deal found 3/19$681
This United Airlines deal was found by Cheapflights users on 3/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/205:05 am
GEG
-
LIS
2 stops26h 25m
United Airlines
Mon 5/47:25 am
LIS
-
GEG
2 stops35h 51m
United Airlines
Deal found 3/20$683

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 March 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$664
(Finnair)

One-way from

$396
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$691
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. 36% potential increase in price ($602 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 18% potential price decrease ($164 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 March 22, 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

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 4/20

4:23 pm-11:10 pm

2 stops23h 47m

Lisbon Humberto Delgado

Wed 4/29

6:45 pm-11:02 pm

2 stops35h 17m

$637

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sun 4/19

1:46 pm-10:45 pm

2 stops48h 59m

Lisbon Humberto Delgado

Mon 5/4

1:00 pm-9:16 pm

2 stops40h 16m

$669

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 4/24

6:15 am-2:35 pm

2 stops24h 20m

Lisbon Humberto Delgado

Sat 5/9

5:00 am-9:13 pm

2 stops24h 13m

$674

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 4/21

5:05 am-3:35 pm

2 stops26h 30m

Lisbon Humberto Delgado

Fri 5/1

11:25 am-3:18 pm

2 stops35h 53m

$676

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Mon 4/20

5:05 am-3:30 pm

2 stops26h 25m

Lisbon Humberto Delgado

Wed 5/6

10:25 am-9:16 pm

2 stops18h 51m

$700

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Sat 4/25

4:15 pm-10:30 am

2 stops35h 15m

Lisbon Humberto Delgado

Tue 5/5

11:25 am-3:18 pm

2 stops34h 53m

$711

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Mon 4/27

7:00 am-10:45 pm

2 stops32h 45m

Lisbon Humberto Delgado

Thu 5/7

11:25 am-3:18 pm

2 stops34h 53m

$713

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Sat 4/25

1:00 pm-8:50 am

2 stops36h 50m

Lisbon Humberto Delgado

Sat 5/2

5:00 am-7:01 pm

2 stops21h 01m

$721

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Thu 4/23

3:30 pm-6:45 pm

2 stops19h 15m

Lisbon Humberto Delgado

Wed 5/6

5:00 am-6:57 pm

2 stops21h 57m

$724

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Thu 4/23

3:30 pm-6:45 pm

2 stops19h 15m

Lisbon Humberto Delgado

Thu 5/7

5:00 am-3:31 pm

2 stops18h 31m

$724

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/21

Showing 1-10 of 47 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 $637, British Airways can have you in Portugal from Idaho in 23h 47m. Airlines will cover a distance of 5150 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 March 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$549Average$824FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$618Average$982FlexibilityNo cancel feeOn-time69%

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