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

Alaska Airlines, Delta, and United Airlines are the most popular carriers operating from Philadelphia to Idaho

How many flights depart from Philadelphia to Idaho on average per week?

12 flights are operational weekly from Philadelphia to Idaho as of August 2026. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.

What airlines fly to Idaho?

Delta, American Airlines and United Airlines are the top three most popular airlines that fly to Idaho from Philadelphia according to our data. Delta is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Idaho. Keep in mind that there are 5 different airlines that fly to Idaho on a routine basis, so you have a few additional options to choose from.

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

Prices for flights from Philadelphia Airport to Idaho are updated daily.

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

The number of operators available for flights from Philadelphia Airport to Idaho is 5 as of August 2026.

How old do you have to be to fly from Philadelphia Airport to Idaho?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Philadelphia Airport to Idaho.

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

The necessary travel and health documents for your Idaho 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.

$145 Cheap Flights from Philadelphia to Idaho in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Philadelphia to Idaho

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:37 pm - 11:29 am

PHL

BOI

16h 52m

1 stop

12:24 pm - 5:39 am

BOI

PHL

15h 15m

1 stop

$234Frontier

Sat, Aug 22 - Sun, Aug 30

8:37 pm - 12:29 pm

PHL

BOI

17h 52m

1 stop

1:24 pm - 5:39 am

BOI

PHL

14h 15m

1 stop

$250Frontier

Mon, Aug 17 - Tue, Aug 25

5:45 am - 12:15 pm

PHL

GEG

9h 30m

1 stop

7:15 pm - 6:00 am

GEG

PHL

7h 45m

1 stop

$289Delta

Wed, Nov 4 - Mon, Nov 9

7:05 am - 12:08 pm

PHL

GEG

8h 03m

1 stop

10:56 pm - 9:38 am

GEG

PHL

7h 42m

1 stop

$289Delta

Wed, Aug 26 - Thu, Aug 27

12:55 pm - 8:21 pm

PHL

GEG

10h 26m

1 stop

6:30 am - 9:06 pm

GEG

PHL

11h 36m

1 stop

$289American Airlines

Sat, Sep 12 - Tue, Sep 22

5:00 am - 10:15 am

PHL

GEG

8h 15m

1 stop

2:50 pm - 12:05 am

GEG

PHL

6h 15m

1 stop

$289Southwest

Thu, Nov 5 - Mon, Nov 9

2:45 pm - 10:25 pm

PHL

GEG

10h 40m

2 stops

6:00 am - 5:55 pm

GEG

PHL

8h 55m

1 stop

$294Southwest

Wed, Aug 26 - Thu, Aug 27

5:00 am - 11:16 am

PHL

BOI

8h 16m

1 stop

3:19 pm - 11:59 pm

BOI

PHL

6h 40m

1 stop

$311American Airlines

Mon, Aug 24 - Wed, Sep 2

6:25 am - 11:28 am

PHL

BOI

7h 03m

1 stop

2:44 pm - 11:44 pm

BOI

PHL

7h 00m

1 stop

$311United Airlines

Wed, Aug 26 - Wed, Sep 2

6:25 am - 11:28 am

PHL

BOI

7h 03m

1 stop

12:24 pm - 9:43 pm

BOI

PHL

7h 19m

1 stop

$311United Airlines

Mon, Aug 24 - Mon, Aug 31

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Alaska Airlines flights from Philadelphia to Idaho

Our best Alaska Airlines deals on Philadelphia to Idaho flight tickets

Alaska Airlines

Sep 11

PHL7:00 amPhiladelphia

10h 30m

1 stop

BOI3:30 pmBoise Air Term. Gowen Fld

Sep 17

BOI5:52 pmBoise Air Term. Gowen Fld

9h 48m

1 stop

PHL5:40 amPhiladelphia

$315

Alaska Airlines

Sep 2

PHL6:59 pmPhiladelphia

8h 00m

1 stop

GEG11:59 pmSpokane

Sep 8

GEG8:31 amSpokane

18h 09m

1 stop

PHL5:40 amPhiladelphia

$341

Alaska Airlines

Nov 14

PHL7:00 amPhiladelphia

10h 27m

1 stop

BOI3:27 pmBoise Air Term. Gowen Fld

Nov 18

BOI6:33 amBoise Air Term. Gowen Fld

8h 16m

1 stop

PHL4:49 pmPhiladelphia

$347

Southwest flights from Philadelphia to Idaho

Our best Southwest deals on Philadelphia to Idaho flight tickets

Southwest

Nov 5

PHL5:00 amPhiladelphia

8h 15m

1 stop

GEG10:15 amSpokane

Nov 9

GEG2:50 pmSpokane

6h 15m

1 stop

PHL12:05 amPhiladelphia

$289

Southwest

Aug 20

PHL2:05 pmPhiladelphia

11h 35m

1 stop

GEG10:40 pmSpokane

Aug 27

GEG6:00 amSpokane

7h 00m

1 stop

PHL4:00 pmPhiladelphia

$294

Southwest

Sep 5

PHL4:50 pmPhiladelphia

7h 10m

1 stop

GEG9:00 pmSpokane

Sep 12

GEG11:05 amSpokane

8h 50m

1 stop

PHL10:55 pmPhiladelphia

$307

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaBoise

PHL - BOI

PHLBOI

Philadelphia

Sat 8/22

8:37 pm-11:29 am

1 stop16h 52m

Boise Air Term. Gowen Fld

Sun 8/30

12:24 pm-5:39 am

1 stop15h 15m

$234

PhiladelphiaBoise

PHL - BOI

PHLBOI

Philadelphia

Mon 8/17

8:37 pm-12:29 pm

1 stop17h 52m

Boise Air Term. Gowen Fld

Tue 8/25

1:24 pm-5:39 am

1 stop14h 15m

$250

PhiladelphiaSpokane

PHL - GEG

PHLGEG

Philadelphia

Wed 11/4

5:45 am-12:15 pm

1 stop9h 30m

Spokane

Mon 11/9

7:15 pm-6:00 am

1 stop7h 45m

$289

PhiladelphiaSpokane

PHL - GEG

PHLGEG

Philadelphia

Wed 8/26

7:05 am-12:08 pm

1 stop8h 03m

Spokane

Thu 8/27

10:56 pm-9:38 am

1 stop7h 42m

$289

PhiladelphiaSpokane

PHL - GEG

PHLGEG

Philadelphia

Sat 9/12

12:55 pm-8:21 pm

1 stop10h 26m

Spokane

Tue 9/22

6:30 am-9:06 pm

1 stop11h 36m

$289

PhiladelphiaSpokane

PHL - GEG

PHLGEG

Philadelphia

Thu 11/5

5:00 am-10:15 am

1 stop8h 15m

Spokane

Mon 11/9

2:50 pm-12:05 am

1 stop6h 15m

$289

PhiladelphiaSpokane

PHL - GEG

PHLGEG

Philadelphia

Wed 8/26

2:45 pm-10:25 pm

2 stops10h 40m

Spokane

Thu 8/27

6:00 am-5:55 pm

1 stop8h 55m

$294

PhiladelphiaBoise

PHL - BOI

PHLBOI

Philadelphia

Mon 8/24

5:00 am-11:16 am

1 stop8h 16m

Boise Air Term. Gowen Fld

Wed 9/2

3:19 pm-11:59 pm

1 stop6h 40m

$311

Quickest round-trip

PhiladelphiaBoise

PHL - BOI

PHLBOI

Philadelphia

Wed 8/26

6:25 am-11:28 am

1 stop7h 03m

Boise Air Term. Gowen Fld

Wed 9/2

2:44 pm-11:44 pm

1 stop7h 00m

$311

PhiladelphiaBoise

PHL - BOI

PHLBOI

Philadelphia

Mon 8/24

6:25 am-11:28 am

1 stop7h 03m

Boise Air Term. Gowen Fld

Mon 8/31

12:24 pm-9:43 pm

1 stop7h 19m

$311

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 Philadelphia to Idaho

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

Other information

What is the cheapest month to fly to Idaho?

In general, April is the cheapest month to fly from Philadelphia to Idaho. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $423. If you don’t want to visit Idaho in April, then you should wait until May to fly from Philadelphia, when ticket prices are also cheap, with an average price of $450.

How far in advance should I book a flight from Philadelphia to Idaho?

You are more likely to see cheaper flights to Idaho from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to Idaho for around $473 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Idaho from Philadelphia for as low as $296 on momondo.

Cheap Philadelphia to Idaho flight deals and tips

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

Fastest flight time	6h 39m
Direct flights	None

The fastest flight from Philadelphia to Idaho takes 6h 39m

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

Search flight deals

Frequently asked questions about flying from Philadelphia to Idaho

When did momondo last update prices for flights from Philadelphia Airport to Idaho?
Prices for flights from Philadelphia Airport to Idaho are updated daily.
How many operators does momondo search for flights from Philadelphia Airport to Idaho?
The number of operators available for flights from Philadelphia Airport to Idaho is 5 as of August 2026.
How old do you have to be to fly from Philadelphia Airport to Idaho?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Philadelphia Airport to Idaho.
What documentation or ID do you need to fly to Idaho?
The necessary travel and health documents for your Idaho 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 Philadelphia to Idaho

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

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $200	Free Cancellation	Rating 7.8 8,497 reviews	Search Delta flights
American Airlines	PriceFrom $283	Free Cancellation	Rating 7.1 11,845 reviews	Search American Airlines flights
United Airlines	PriceFrom $318	Free Cancellation	Rating 7.4 10,062 reviews	Search United Airlines flights
Southwest	PriceFrom $371	Free Cancellation	Rating 8.0 4,229 reviews	Search Southwest flights

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Philadelphia to Idaho. Millions of users trust and use momondo every year so you are in good hands.

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

Flights from Philadelphia to Idaho with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo provides multiple filters to help you find the best flight to Idaho from Philadelphia. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes. momondo can track prices for Philadelphia to Idaho flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.