How long is the flight from Philadelphia to Idaho Falls?

A quick flight from Philadelphia to Idaho Falls can take about 17h 14m. Alaska Airlines provides one of the quickest options available for as low as $439. There are 1899 mi between Philadelphia and Idaho Falls. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines flying from Philadelphia to Idaho Falls round-trip?

Cheapflights users have booked flights from Philadelphia to Idaho Falls round-trip from $324. Other airlines that can offer you cheap pricing are American Airlines, from $354, and United Airlines, from $414. You may be able to fly from Philadelphia to Idaho Falls for 52% less than the average price by searching for these airlines.

In terms of precipitation, rainfall in Idaho Falls ranges from 0.6 - 2.0 inches per month. May is typically the wettest month, when rainfall can reach 2.0 in. July is typically the driest time to visit Idaho Falls when rainfall is around 0.6 in.

If weather is an important factor for your trip to Idaho Falls, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

What are the most popular airlines that fly from Philadelphia to Idaho Falls?

Consider American Airlines, Delta or United Airlines when booking your flight. These represent the most popular airlines when flying from Philadelphia to Idaho Falls.

What is the cheapest time of day to fly from PHL to IDA?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Philadelphia to Idaho Falls as you normally would.

Most accurate provider : When it comes to deals on Philadelphia-Idaho Falls flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Philadelphia-Idaho Falls flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Philadelphia-Idaho Falls flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Philadelphia-Idaho Falls flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-Idaho Falls flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Philadelphia to Idaho Falls that include hotel bookings?

Yes. In addition to deals on Philadelphia to Idaho Falls flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Philadelphia to Idaho Falls?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Idaho Falls.

Can I find deals for business class flights from Philadelphia to Idaho Falls?

Yes. Cheapflights offers flight deals from Philadelphia to Idaho Falls by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$261+ Flights from Philadelphia to Idaho Falls

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Philadelphia to Idaho Falls 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 Philadelphia to Idaho Falls

Cheapest flights from Philadelphia to Idaho Falls
Explore the most affordable flight options available from Philadelphia to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

Thu 12/258:00 amPHL - IDA

1 stop9h 24mUnited Airlines

Mon 12/295:00 amIDA - PHL

1 stop8h 46mUnited Airlines

Deal found 12/10

$616

Fri 12/124:04 pmPHL - IDA

1 stop8h 32mAmerican Airlines

Sat 12/137:00 amIDA - PHL

1 stop20h 33mAmerican Airlines

Deal found 12/11

$729

Tue 12/308:27 amPHL - IDA

2 stops14h 47mUnited Airlines

Sun 1/44:05 pmIDA - PHL

1 stop29h 07mUnited Airlines

Deal found 12/11

$889

Sat 12/276:35 amPHL - IDA

3 stops18h 24mUnited Airlines

Fri 1/25:00 amIDA - PHL

2 stops10h 28mUnited Airlines

Deal found 12/11

$1,087

Sat 12/273:53 pmPHL - IDA

1 stop8h 28mAmerican Airlines

Fri 1/21:16 pmIDA - PHL

1 stop8h 26mAmerican Airlines

Deal found 12/10

$1,310

Best flights from Philadelphia to Idaho Falls
Discover carefully curated flight deals from Philadelphia to Idaho Falls that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.

Tue 4/216:35 pmPHL - IDA

1 stop22h 45mAlaska Airlines

Tue 4/284:00 pmIDA - PHL

1 stop11h 23mAlaska Airlines

Deal found 12/11

$418

Sat 6/67:00 amPHL - IDA

1 stop17h 14mDelta

Tue 6/166:50 pmIDA - PHL

1 stop8h 53mDelta

Deal found 12/11

$439

Wed 1/218:09 amPHL - IDA

1 stop9h 22mUnited Airlines

Sat 1/242:40 pmIDA - PHL

1 stop6h 50mUnited Airlines

Deal found 12/10

$479

Fri 1/97:06 pmPHL - IDA

1 stop25h 12mAlaska Airlines

Fri 1/166:58 pmIDA - PHL

1 stop21h 05mAlaska Airlines

Deal found 12/10

$418

Thu 1/810:30 amPHL - IDA

2 stops13h 49mDelta

Thu 1/151:15 pmIDA - PHL

1 stop7h 59mDelta

Deal found 12/11

$444

Tue 6/97:00 amPHL - IDA

1 stop9h 27mDelta

Mon 6/156:50 pmIDA - PHL

1 stop8h 53mDelta

Deal found 12/11

$478

Sat 6/67:00 amPHL - IDA

1 stop17h 14mDelta

Thu 6/116:50 pmIDA - PHL

1 stop8h 53mDelta

Deal found 12/11

$498

Sat 6/67:00 amPHL - IDA

1 stop17h 14mDelta

Fri 6/126:50 pmIDA - PHL

1 stop8h 53mDelta

Deal found 12/11

$498

Last-minute flights from Philadelphia to Idaho Falls
Discover last-minute flight deals from Philadelphia to Idaho Falls. Data last updated December 12, 2025 and is based on user searches.

Thu 1/810:30 amPHL - IDA

2 stops13h 49mDelta

Thu 1/151:15 pmIDA - PHL

1 stop7h 59mDelta

Deal found 12/11

$444

Fri 1/97:06 pmPHL - IDA

1 stop25h 12mAlaska Airlines

Fri 1/166:58 pmIDA - PHL

1 stop21h 05mAlaska Airlines

Deal found 12/10

$418

Fri 1/96:30 amPHL - IDA

2 stops11h 01mUnited Airlines

Fri 1/162:40 pmIDA - PHL

1 stop6h 50mUnited Airlines

Deal found 12/10

$424

Fri 1/912:08 pmPHL - IDA

2 stops12h 28mAmerican Airlines

Fri 1/167:20 amIDA - PHL

2 stops11h 45mAmerican Airlines

Deal found 12/10

$480

Fri 1/167:06 pmPHL - IDA

1 stop25h 12mAlaska Airlines

Mon 1/196:58 pmIDA - PHL

1 stop21h 05mAlaska Airlines

Deal found 12/10

$533

Sat 1/176:21 amPHL - IDA

1 stop9h 16mAmerican Airlines

Sat 1/247:20 amIDA - PHL

1 stop8h 22mAmerican Airlines

Deal found 12/11

$367

Wed 1/218:09 amPHL - IDA

1 stop9h 22mUnited Airlines

Sat 1/242:40 pmIDA - PHL

1 stop6h 50mUnited Airlines

Deal found 12/10

$479

Wed 1/217:06 pmPHL - IDA

1 stop29h 53mAlaska Airlines

Sat 1/246:58 pmIDA - PHL

1 stop21h 05mAlaska Airlines

Deal found 12/9

$507

One-way flights from Philadelphia to Idaho Falls
Search for one-way flight options from Philadelphia to Idaho Falls. Find affordable one-way fares based on user searches. Data last updated December 12, 2025.

Sun 2/15:00 amPHL - IDA

1 stop10h 37mAmerican Airlines

Deal found 12/10

$261

Mon 12/223:53 pmPHL - IDA

1 stop8h 28mAmerican Airlines

Deal found 12/11

$291

Sun 2/18:09 amPHL - IDA

1 stop7h 21mUnited Airlines

Deal found 12/11

$306

Wed 12/242:00 pmPHL - IDA

2 stops10h 52mDelta

Deal found 12/11

$341

Wed 12/247:15 amPHL - IDA

1 stop10h 48mAmerican Airlines

Deal found 12/10

$399

Tue 12/236:35 amPHL - IDA

2 stops8h 55mUnited Airlines

Deal found 12/10

$401

Wed 12/2412:37 pmPHL - IDA

2 stops12h 22mUnited Airlines

Deal found 12/10

$411

Find flight deals from Philadelphia to Idaho Falls

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$367 (American Airlines)
One-way from	$261 (American Airlines)
Popular in	January
Cheapest in	February
Average price	$594

Provider with most accurate pricing for Philadelphia-Idaho Falls Fanning Field flight deals.

Search Deals

Provider most trusted by Cheapflights users for Philadelphia-Idaho Falls Fanning Field flights.

Search Deals

From Philadelphia to Idaho Falls Fanning Field

Search Deals

One-way flight from Philadelphia to Idaho Falls Fanning Field

Search Deals

Highest demand for flights based on searches. 18% potential increase in price ($158 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 12% potential price decrease ($76 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Philadelphia to Idaho Falls that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Tue 4/21

6:35 pm-3:20 pm

1 stop22h 45m

Idaho Falls Fanning Field

Tue 4/28

4:00 pm-5:23 am

1 stop11h 23m

$418

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Fri 1/9

7:06 pm-6:18 pm

1 stop25h 12m

Idaho Falls Fanning Field

Fri 1/16

6:58 pm-6:03 pm

1 stop21h 05m

$418

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Sat 6/6

7:00 am-10:14 pm

1 stop17h 14m

Idaho Falls Fanning Field

Tue 6/16

6:50 pm-5:43 am

1 stop8h 53m

$439

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Thu 1/8

10:30 am-10:19 pm

2 stops13h 49m

Idaho Falls Fanning Field

Thu 1/15

1:15 pm-11:14 pm

1 stop7h 59m

$444

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Tue 6/9

7:00 am-2:27 pm

1 stop9h 27m

Idaho Falls Fanning Field

Mon 6/15

6:50 pm-5:43 am

1 stop8h 53m

$478

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Wed 1/21

8:09 am-3:31 pm

1 stop9h 22m

Idaho Falls Fanning Field

Sat 1/24

2:40 pm-11:30 pm

1 stop6h 50m

$479

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Sat 6/6

7:00 am-10:14 pm

1 stop17h 14m

Idaho Falls Fanning Field

Thu 6/11

6:50 pm-5:43 am

1 stop8h 53m

$498

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Sat 6/6

7:00 am-10:14 pm

1 stop17h 14m

Idaho Falls Fanning Field

Fri 6/12

6:50 pm-5:43 am

1 stop8h 53m

$498

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Sun 2/1

5:00 am-1:37 pm

1 stop10h 37m

$261

PhiladelphiaIdaho Falls

PHL - IDA

PHLIDA

Philadelphia

Mon 12/22

3:53 pm-10:21 pm

1 stop8h 28m

$291

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 15 results

Compare providers for flights from Philadelphia to Idaho Falls

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Idaho Falls in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Philadelphia-Idaho Falls flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Philadelphia-Idaho Falls flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Philadelphia-Idaho Falls flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Philadelphia-Idaho Falls flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-Idaho Falls flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Philadelphia to Idaho Falls

Have a flexible travel schedule? Discover the best time to fly to Idaho Falls from Philadelphia 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 Philadelphia to Idaho Falls

What is the cheapest month to book a flight from Philadelphia to Idaho Falls?

Currently, October is the cheapest month in which you can book a flight from Philadelphia to Idaho Falls (average of $138). Flying from Philadelphia to Idaho Falls in December is currently the most expensive (average of $385). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Idaho Falls

Read through reviews of airlines operating flights from Philadelphia to Idaho Falls, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Delta

7.9

Good

8,008 reviews

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

United Airlines

7.4

Good

9,095 reviews

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

American Airlines

7.2

Good

11,050 reviews

Delta

7.9

Good

8,008 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Related info for your journey

How long is the flight from Philadelphia to Idaho Falls?
A quick flight from Philadelphia to Idaho Falls can take about 17h 14m. Alaska Airlines provides one of the quickest options available for as low as $439. There are 1899 mi between Philadelphia and Idaho Falls. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines flying from Philadelphia to Idaho Falls round-trip?
Cheapflights users have booked flights from Philadelphia to Idaho Falls round-trip from $324. Other airlines that can offer you cheap pricing are American Airlines, from $354, and United Airlines, from $414. You may be able to fly from Philadelphia to Idaho Falls for 52% less than the average price by searching for these airlines.
Can I find deals for flights from Philadelphia to Idaho Falls that include hotel bookings?
Yes. In addition to deals on Philadelphia to Idaho Falls flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Philadelphia to Idaho Falls?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Idaho Falls.
Can I find deals for business class flights from Philadelphia to Idaho Falls?
Yes. Cheapflights offers flight deals from Philadelphia to Idaho Falls by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Philadelphia to Idaho Falls?
Currently, October is the cheapest month in which you can book a flight from Philadelphia to Idaho Falls (average of $138). Flying from Philadelphia to Idaho Falls in December is currently the most expensive (average of $385). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Rexburg

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Philadelphia to Idaho Falls

Newark to Jackson flights

John F Kennedy Intl to Jackson flights

LaGuardia to Jackson flights

Dulles Intl to Jackson flights

John F Kennedy Intl to Boise flights

Newark to Boise flights

Reagan-National to Jackson flights

John F Kennedy Intl to Hailey flights

LaGuardia to Boise flights

Newark to Hailey flights

LaGuardia to Hailey flights

Philadelphia to Jackson flights

John F Kennedy Intl to Spokane flights

Dulles Intl to Boise flights

LaGuardia to Spokane flights

Newark to Spokane flights

Dulles Intl to Spokane flights

Pittsburgh to Spokane flights

Reagan-National to Spokane flights

Dulles Intl to Hailey flights

Reagan-National to Boise flights

Dulles Intl to Idaho Falls flights

Philadelphia to Spokane flights

Pittsburgh to Boise flights

Pittsburgh to Jackson flights

Reagan-National to Hailey flights

Philadelphia to Boise flights

Reagan-National to Idaho Falls flights

John F Kennedy Intl to Idaho Falls flights

Newark to Idaho Falls flights

LaGuardia to Idaho Falls flights

Pittsburgh to Idaho Falls flights

Philadelphia to Hailey flights

Allentown to Spokane flights

Harrisburg to Spokane flights

Allentown to Jackson flights

Newark to West Yellowstone flights

Dulles Intl to West Yellowstone flights

Pittsburgh to Hailey flights

Allentown to Boise flights

Reagan-National to West Yellowstone flights

Harrisburg to Boise flights

Harrisburg to Jackson flights

Scranton to Jackson flights

LaGuardia to West Yellowstone flights

Philadelphia to West Yellowstone flights

Other flights to Idaho Falls

Portland to Idaho Falls flights

Las Vegas to Idaho Falls flights

Seattle to Idaho Falls flights

Denver to Idaho Falls flights

Dallas/Fort Worth to Idaho Falls flights

Idaho Falls to Las Vegas flights

Idaho Falls to Portland flights

Idaho Falls to Santa Ana, California flights

Idaho Falls to Las Vegas flights

Idaho Falls to Phoenix-Mesa Gateway Airport flights

Idaho Falls to Santa Ana, California flights

Idaho Falls to Salt Lake City flights

Idaho Falls to Phoenix Sky Harbor Intl Airport flights

Idaho Falls to Seattle flights

Idaho Falls to Denver flights

Idaho Falls to Dallas/Fort Worth Airport flights

Idaho Falls to Denver flights

Idaho Falls to Salt Lake City flights

Idaho Falls to Phoenix Sky Harbor Intl Airport flights

Idaho Falls to Denver flights

Idaho Falls to Dallas/Fort Worth Airport flights

Top 3 airlines flying from Philadelphia to Idaho Falls

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$324	Average$513	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$354	Average$554	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$414	Average$665	FlexibilityNo cancel fee	On-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.

$261+ Cheap flights from Philadelphia to Idaho Falls (PHL - IDA)

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 2/1. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Philadelphia to Idaho Falls with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Philadelphia to Idaho Falls

Cheapest flights from Philadelphia to Idaho FallsExplore the most affordable flight options available from Philadelphia to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

Explore the most affordable flight options available from Philadelphia to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

Find flight deals from Philadelphia to Idaho Falls

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Philadelphia to Idaho Falls that are best for you.

Compare providers for flights from Philadelphia to Idaho Falls

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Idaho Falls in December.

Best time to book a flight from Philadelphia to Idaho Falls

Have a flexible travel schedule? Discover the best time to fly to Idaho Falls from Philadelphia with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to Idaho Falls

What is the cheapest month to book a flight from Philadelphia to Idaho Falls?

Reviews of airlines servicing Idaho Falls

Read through reviews of airlines operating flights from Philadelphia to Idaho Falls, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Idaho Falls. 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 Philadelphia to Idaho Falls?

What are the cheapest airlines flying from Philadelphia to Idaho Falls round-trip?

Can I find deals for flights from Philadelphia to Idaho Falls that include hotel bookings?

How can I find direct flights from Philadelphia to Idaho Falls?

Can I find deals for business class flights from Philadelphia to Idaho Falls?

What is the cheapest month to book a flight from Philadelphia to Idaho Falls?

Traveling to a place near Idaho Falls?

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 Philadelphia to Idaho Falls

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from Philadelphia to Idaho Falls

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Philadelphia to Idaho Falls
Explore the most affordable flight options available from Philadelphia to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.