What is the cheapest airline that flies from Idaho to Portugal?

United Airlines, Air Canada, and Delta are the most popular carriers operating from Idaho to Portugal

What airlines fly to Portugal?

United Airlines, Delta and Air Canada are the top three most popular airlines that fly to Portugal from Idaho according to our data. United Airlines is the first choice among our users, with 53% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 4 different airlines that fly to Portugal on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Idaho to Portugal?

Prices for flights from Idaho to Portugal refresh daily.

How many operators does momondo search for flights from Idaho to Portugal?

As of November 2025, there are 4 operators available to choose from for flights from Idaho to Portugal.

How old do you have to be to fly from Idaho to Portugal?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Idaho to Portugal.

What documentation or ID do you need to fly to Portugal?

The necessary travel and health documents for your Portugal trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$335 Cheap Flights from Idaho to Portugal in 2025/26

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Find the cheapest flights from Idaho to Portugal

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:15 am - 8:55 amBOI-LIS

17h 40m2 stops

11:20 am - 1:35 pmLIS-BOI

33h 15m2 stops

$489Air Canada

Find Deal

Sat, Jan 24 - Mon, Feb 2

5:00 am - 8:10 amGEG-LIS

19h 10m2 stops

11:20 am - 9:22 pmLIS-GEG

42h 02m2 stops

$493United Airlines

Find Deal

Tue, Jan 27 - Wed, Feb 4

7:00 am - 9:20 amJAC-LIS

19h 20m2 stops

5:00 am - 8:37 pmLIS-JAC

22h 37m2 stops

$498United Airlines

Find Deal

Fri, Dec 5 - Tue, Dec 9

8:50 am - 11:20 amBOI-LIS

19h 30m2 stops

5:00 am - 8:13 pmLIS-BOI

22h 13m2 stops

$499Delta

Find Deal

Thu, Mar 5 - Mon, Mar 30

8:15 am - 8:55 amBOI-LIS

17h 40m3 stops

11:20 am - 11:25 amLIS-BOI

31h 05m2 stops

$518Multiple Airlines

Find Deal

Sat, Jan 24 - Mon, Feb 2

12:30 pm - 11:30 pmGEG-LIS

28h 00m2 stops

7:25 am - 8:56 pmLIS-GEG

21h 31m2 stops

$569Lufthansa

Find Deal

Wed, Mar 18 - Wed, Apr 15

10:35 am - 10:15 amBOI-LIS

40h 40m3 stops

11:00 am - 10:59 pmLIS-BOI

18h 59m2 stops

$593Multiple Airlines

Find Deal

Mon, Dec 8 - Wed, Dec 24

5:45 am - 11:20 amGEG-LIS

22h 35m2 stops

10:40 am - 11:16 pmLIS-GEG

19h 36m2 stops

$650Delta

Find Deal

Fri, Mar 13 - Thu, Mar 26

1:12 pm - 4:55 pmGEG-FAO

43h 43m2 stops

7:15 pm - 8:10 pmFAO-GEG

32h 55m2 stops

$749KLM

Find Deal

Thu, Dec 4 - Mon, Dec 8

7:02 am - 10:45 pmGEG-LIS

31h 43m2 stops

2:30 pm - 11:38 pmLIS-GEG

41h 08m2 stops

$750Lufthansa

Find Deal

Sun, Apr 26 - Mon, Jun 1

Air Canada flights from Idaho to Portugal

Our best Air Canada deals on Idaho to Portugal flight tickets

Air Canada

Jan 24

BOI8:15 amBoise Air Term. Gowen Fld

17h 40m

2 stops

LIS8:55 amLisbon Humberto Delgado

Feb 2

LIS11:20 amLisbon Humberto Delgado

33h 15m

2 stops

BOI1:35 pmBoise Air Term. Gowen Fld

$489

Find similar

Air Canada

Apr 29

GEG7:10 amSpokane

18h 10m

2 stops

LIS9:20 amLisbon Humberto Delgado

May 29

LIS12:55 pmLisbon Humberto Delgado

40h 50m

2 stops

GEG9:45 pmSpokane

$776

Find similar

Air Canada

May 1

GEG12:30 pmSpokane

36h 50m

2 stops

LIS9:20 amLisbon Humberto Delgado

May 28

LIS11:25 amLisbon Humberto Delgado

39h 09m

2 stops

GEG6:34 pmSpokane

$786

Find similar

United Airlines flights from Idaho to Portugal

Our best United Airlines deals on Idaho to Portugal flight tickets

United Airlines

Jan 27

GEG5:00 amSpokane

19h 10m

2 stops

LIS8:10 amLisbon Humberto Delgado

Feb 4

LIS11:20 amLisbon Humberto Delgado

42h 02m

2 stops

GEG9:22 pmSpokane

$493

Find similar

United Airlines

Dec 5

JAC7:00 amJackson Hole

19h 20m

2 stops

LIS9:20 amLisbon Humberto Delgado

Dec 9

LIS5:00 amLisbon Humberto Delgado

22h 37m

2 stops

JAC8:37 pmJackson Hole

$498

Find similar

United Airlines

Dec 8

BOI2:49 pmBoise Air Term. Gowen Fld

36h 26m

2 stops

LIS10:15 amLisbon Humberto Delgado

Dec 16

LIS11:20 amLisbon Humberto Delgado

54h 19m

2 stops

BOI10:39 amBoise Air Term. Gowen Fld

$503

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 1/24

8:15 am-8:55 am

2 stops17h 40m

Lisbon Humberto Delgado

Mon 2/2

11:20 am-1:35 pm

2 stops33h 15m

$489

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Tue 1/27

5:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Wed 2/4

11:20 am-9:22 pm

2 stops42h 02m

$493

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Fri 12/5

7:00 am-9:20 am

2 stops19h 20m

Lisbon Humberto Delgado

Tue 12/9

5:00 am-8:37 pm

2 stops22h 37m

$498

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Thu 3/5

8:50 am-11:20 am

2 stops19h 30m

Lisbon Humberto Delgado

Mon 3/30

5:00 am-8:13 pm

2 stops22h 13m

$499

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 1/24

8:15 am-8:55 am

3 stops17h 40m

Lisbon Humberto Delgado

Mon 2/2

11:20 am-11:25 am

2 stops31h 05m

$518

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 3/18

12:30 pm-11:30 pm

2 stops28h 00m

Lisbon Humberto Delgado

Wed 4/15

7:25 am-8:56 pm

2 stops21h 31m

$569

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 12/8

10:35 am-10:15 am

3 stops40h 40m

Lisbon Humberto Delgado

Wed 12/24

11:00 am-10:59 pm

2 stops18h 59m

$593

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Fri 3/13

5:45 am-11:20 am

2 stops22h 35m

Lisbon Humberto Delgado

Thu 3/26

10:40 am-11:16 pm

2 stops19h 36m

$650

SpokaneFaro

GEG - FAO

GEGFAO

Spokane

Thu 12/4

1:12 pm-4:55 pm

2 stops43h 43m

Faro

Mon 12/8

7:15 pm-8:10 pm

2 stops32h 55m

$749

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sun 4/26

7:02 am-10:45 pm

2 stops31h 43m

Lisbon Humberto Delgado

Mon 6/1

2:30 pm-11:38 pm

2 stops41h 08m

$750

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Idaho to Portugal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Idaho is in December. Flight prices, which tend to average around $631, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of December, then book flights to Portugal from Idaho during November instead. Flights to Portugal in November, while not as cheap as those in December, still average around $649.

What is the cheapest day to depart on your flight to Portugal?

According to our data, Wednesday is the cheapest day to fly to Portugal from Idaho. The lowest ticket price found for a Wednesday departure recently was $1,041. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Saturday, with ticket prices averaging around $1,444.

What is the cheapest time of day to depart on your flight to Portugal?

Our most recent data shows that the best time of day to fly to Portugal is in the afternoon. Flights from Idaho to Portugal during this time can be as low as $1,071. In the evening is when there is more demand to fly to Portugal, so prices are often more expensive at around $1,393 per ticket.

Cheap Idaho to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Idaho to Portugal

Direct flights	None

There are no direct flights from Idaho to Portugal. There are no popular flight routes from Idaho to Portugal.

Search flight deals

When did momondo last update prices for flights from Idaho to Portugal?
Prices for flights from Idaho to Portugal refresh daily.
How many operators does momondo search for flights from Idaho to Portugal?
As of November 2025, there are 4 operators available to choose from for flights from Idaho to Portugal.
How old do you have to be to fly from Idaho to Portugal?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Idaho to Portugal.
What documentation or ID do you need to fly to Portugal?
The necessary travel and health documents for your Portugal trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Idaho to Portugal

Compare and see reviews for airlines that fly from Idaho to Portugal with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $601	Free Cancellation	Rating 7.4 9,011 reviews	Search United Airlines flights
Air Canada	PriceFrom $602	Free Cancellation	Rating 7.1 10,429 reviews	Search Air Canada flights
American Airlines	PriceFrom $621	Free Cancellation	Rating 7.2 11,047 reviews	Search American Airlines flights
Delta	PriceFrom $654	Free Cancellation	Rating 7.9 8,004 reviews	Search Delta flights

Why use momondo?

Why should I use momondo to find a flight deal from Idaho to Portugal?

Finding the right flight to Portugal from Idaho is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Portugal quick and easy, saving you time and money.

Can I find flights from Idaho to Portugal with flexible booking policies on momondo?

momondo does allow users to show only those flights to Portugal from Idaho which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Idaho to Portugal?

Once all potential Idaho to Portugal flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Idaho to Portugal right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Portugal from Idaho. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.