HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portugal

$363+ 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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LIS
Apr 24 — May 11
Fri 4/24
Fri 5/1
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Idaho 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 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 25, 2026.

This Finnair 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/211:41 pm
BOI
-
LIS
2 stops26h 44m
Multiple Airlines
Tue 4/284:35 pm
LIS
-
BOI
2 stops37h 19m
Multiple Airlines
Deal found 3/22$664
This Flysmarter 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/213:44 pm
BOI
-
LIS
2 stops20h 01m
KLM
Tue 4/285:00 am
LIS
-
BOI
2 stops18h 14m
KLM
Deal found 3/22$666
This United Airlines deal was found by Cheapflights users on 3/23. 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.
Wed 12/212:30 pm
JAC
-
LIS
3 stops37h 50m
United Airlines
Sun 12/65:00 am
LIS
-
JAC
2 stops39h 57m
United Airlines
Deal found 3/23$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 Delta deal was found by Cheapflights users on 3/23. 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 4/211:52 pm
BOI
-
LIS
2 stops20h 58m
Delta
Tue 5/55:00 am
LIS
-
BOI
2 stops18h 14m
Delta
Deal found 3/23$670
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/234:08 pm
BOI
-
LIS
2 stops23h 37m
United Airlines
Thu 4/305:05 am
LIS
-
BOI
2 stops21h 06m
United Airlines
Deal found 3/22$672
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 4/187:00 am
GEG
-
LIS
2 stops31h 45m
Lufthansa
Mon 4/276:15 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 3/20. 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

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 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$664
(Finnair)

One-way from

$363
(Iberia)

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 25, 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

Tue 4/21

1:41 pm-11:25 pm

2 stops26h 44m

Lisbon Humberto Delgado

Tue 4/28

4:35 pm-10:54 pm

2 stops37h 19m

$664

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

Sun 4/19

5:05 am-10:45 pm

2 stops33h 40m

Lisbon Humberto Delgado

Sun 4/26

5:05 am-11:43 am

2 stops38h 38m

$672

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

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 4/24

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

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

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 4/22

6:00 am-2:35 pm

2 stops24h 35m

Lisbon Humberto Delgado

Mon 5/4

5:00 am-6:57 pm

2 stops21h 57m

$724

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sat 5/2

6:15 am-5:50 pm

2 stops27h 35m

Lisbon Humberto Delgado

Sun 5/10

5:35 am-11:18 pm

2 stops25h 43m

$728

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 51 resultsSorted by cheapest first
1
2
3
...
6

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 $674, United Airlines can have you in Portugal from Idaho in 17h 35m. Airlines will cover a distance of 5022 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

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.

Alternative routes for Idaho to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Charles de Gaulle flights
John F Kennedy Intl to Leonardo da Vinci/Fiumicino flights
Newark to Charles de Gaulle flights
John F Kennedy Intl to Gatwick flights
Newark to Leonardo da Vinci/Fiumicino flights
LaGuardia to Heathrow flights
Newark to Gatwick flights
John F Kennedy Intl to London City flights
John F Kennedy Intl to Lisbon flights
Boston to Heathrow flights
John F Kennedy Intl to Madrid flights
John F Kennedy Intl to Barcelona-El Prat flights
Dulles Intl to Heathrow flights
John F Kennedy Intl to Dublin flights
Los Angeles to Heathrow flights
John F Kennedy Intl to Orly flights
Newark to Dublin flights
Newark to Madrid flights
John F Kennedy Intl to Malpensa flights
Newark to Athens flights
LaGuardia to Gatwick flights
Newark to Lisbon flights
Newark to Orly flights
Newark to Barcelona-El Prat flights
John F Kennedy Intl to Athens flights
Newark to Malpensa flights
John F Kennedy Intl to Istanbul flights
Boston to Charles de Gaulle flights
O'Hare Intl to Leonardo da Vinci/Fiumicino flights
O'Hare Intl to Heathrow flights
Dallas/Fort Worth to Heathrow flights
San Francisco to Heathrow flights
Los Angeles to Charles de Gaulle flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
Boston to Leonardo da Vinci/Fiumicino flights
Dulles Intl to Charles de Gaulle flights
Miami to Madrid flights
John F Kennedy Intl to Frederic Chopin flights
Baltimore to Heathrow flights
O'Hare Intl to Charles de Gaulle flights
Seattle to Heathrow flights
San Francisco to Charles de Gaulle flights
Newark to London City flights

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 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$549Average$824FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$618Average$982FlexibilityNo 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.