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$145+ Cheap flights from Idaho to Philadelphia (PHL)

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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — PHL
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Find flight deals from Idaho to Philadelphia

Cheapest flights from Idaho to Philadelphia
Explore the most affordable flight options available from Idaho to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/198:45 amGEG - PHL
1 stop17h 57mAlaska Airlines
Thu 12/46:54 pmPHL - GEG
1 stop8h 30mAlaska Airlines
Deal found 10/28$312
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/48:47 pmGEG - PHL
1 stop29h 59mAlaska Airlines
Mon 12/87:06 amPHL - GEG
1 stop20h 18mAlaska Airlines
Deal found 10/29$314
This Delta deal was found by Cheapflights users on 10/28. 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.
Wed 11/197:38 pmGEG - PHL
2 stops12h 13mDelta
Wed 12/36:18 amPHL - GEG
2 stops11h 37mDelta
Deal found 10/28$328
This KAYAK deal was found by Cheapflights users on 10/28. 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.
Wed 12/36:03 amBOI - PHL
1 stop9h 50mAlaska Airlines
Mon 12/87:06 amPHL - BOI
1 stop10h 20mAlaska Airlines
Deal found 10/28$330
This Expedia deal was found by Cheapflights users on 10/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/198:45 amGEG - PHL
1 stop17h 57mAlaska Airlines
Wed 12/36:54 pmPHL - GEG
1 stop20h 45mAlaska Airlines
Deal found 10/28$334
This Delta deal was found by Cheapflights users on 10/28. 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.
Thu 12/41:10 pmGEG - PHL
2 stops13h 40mDelta
Mon 12/87:05 amPHL - GEG
2 stops14h 50mDelta
Deal found 10/28$336
This United Airlines deal was found by Cheapflights users on 10/28. 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 12/2112:53 pmSUN - PHL
1 stop6h 38mUnited Airlines
Tue 12/306:35 amPHL - SUN
1 stop7h 37mUnited Airlines
Deal found 10/28$341
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2012:54 pmBOI - PHL
1 stop14h 37mMultiple Airlines
Thu 1/18:36 pmPHL - BOI
2 stops20h 28mMultiple Airlines
Deal found 10/28$341
This United Airlines deal was found by Cheapflights users on 10/28. 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 11/195:10 amGEG - PHL
1 stop7h 32mUnited Airlines
Thu 12/46:30 amPHL - GEG
2 stops15h 14mUnited Airlines
Deal found 10/28$345
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2210:41 pmBOI - PHL
2 stops40h 49mMultiple Airlines
Fri 1/28:36 pmPHL - BOI
1 stop17h 23mMultiple Airlines
Deal found 10/28$346
This Delta deal was found by Cheapflights users on 10/28. 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.
Wed 11/197:38 pmGEG - PHL
2 stops12h 13mDelta
Thu 12/411:46 amPHL - GEG
2 stops12h 11mDelta
Deal found 10/28$347
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2012:54 pmBOI - PHL
1 stop14h 37mMultiple Airlines
Wed 12/3111:19 amPHL - BOI
2 stops26h 24mMultiple Airlines
Deal found 10/28$354

Cheap flight deals from Idaho to Philadelphia

Keep the following information in mind while searching for Idaho to Philadelphia flight deals. Data was last updated October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$312
(Kiwi.com)

One-way from

$145
(Kiwi.com)

Popular in

October

Cheapest in

January

Average price

$672
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Philadelphia flights.
Search Deals
From Idaho to Philadelphia
Search Deals
One-way flight from Idaho to Philadelphia
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho to Philadelphia 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 October 30, 2025.
Use the filters below to find and compare flights from Idaho to Philadelphia that are best for you.

Fly from

Idaho

Fly to

Philadelphia

Route

Depart

Return

Price

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Thu 12/4

8:47 pm-5:46 am

1 stop29h 59m

Philadelphia

Mon 12/8

7:06 am-12:24 am

1 stop20h 18m

$314

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Thu 12/4

1:10 pm-5:50 am

2 stops13h 40m

Philadelphia

Mon 12/8

7:05 am-2:55 pm

2 stops10h 50m

$328

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Wed 11/19

8:45 am-5:42 am

1 stop17h 57m

Philadelphia

Wed 12/3

6:54 pm-12:39 pm

1 stop20h 45m

$334

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Tue 1/20

6:00 pm-6:06 pm

1 stop21h 06m

Philadelphia

Tue 1/27

7:06 pm-12:23 am

1 stop8h 17m

$342

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Thu 1/22

5:45 am-6:06 pm

1 stop9h 21m

Philadelphia

Mon 1/26

7:06 pm-12:23 am

1 stop8h 17m

$342

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Mon 1/12

6:30 am-5:42 pm

1 stop8h 12m

Philadelphia

Wed 1/14

9:00 am-2:58 pm

1 stop8h 58m

$343

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Thu 1/22

5:00 am-3:50 pm

1 stop7h 50m

Philadelphia

Mon 1/26

6:30 am-11:39 am

1 stop8h 09m

$343

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Wed 11/19

6:00 am-5:37 pm

1 stop8h 37m

Philadelphia

Wed 12/3

6:18 am-2:55 pm

2 stops11h 37m

$345

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Wed 11/19

5:10 am-3:42 pm

1 stop7h 32m

Philadelphia

Thu 12/4

6:30 am-6:44 pm

2 stops15h 14m

$345

HaileyPhiladelphia

SUN - PHL

SUNPHL

Hailey Sun Valley-Friedman

Sun 12/21

4:30 pm-5:32 am

2 stops11h 02m

Philadelphia

Tue 12/30

6:35 am-12:12 pm

1 stop7h 37m

$346

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 56 results
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Best time to book a flight from Idaho to Philadelphia

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

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

Currently, September is the cheapest month in which you can book a flight from Idaho to Philadelphia (average of $115). Flying from Idaho to Philadelphia in November is currently the most expensive (average of $276). 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.

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

Find hourly flight availability from Idaho to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 30, 2025.

When flying from Idaho to Philadelphia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 39% versus a flight in the morning.

What is the cheapest day to fly from Idaho to Philadelphia?

Use this chart to determine the cheapest time to fly round-trip from Idaho to Philadelphia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Idaho to Philadelphia flight should consider departing on Saturday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Idaho to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Philadelphia from Idaho?

    If you book a flight to Philadelphia from Idaho, you will be flying to Philadelphia, which is the city’s only airport. Philadelphia (PHL) is located 7.0 mi from the center of Philadelphia.

  • How long is the flight from Idaho to Philadelphia?

    For as low as $346, Alaska Airlines can have you in Philadelphia from Idaho in 11h 02m. The distance between Idaho and Philadelphia is about 2011 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Idaho to Philadelphia one-way?

    $145 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on American Airlines and Delta, with prices starting from $172 and $173, respectively.

  • What are the most popular routes from Idaho to Philadelphia?

    The most popular route from Idaho to Philadelphia is Spokane - Philadelphia. You may also consider Boise Air Term. Gowen Fld - Philadelphia or Jackson Hole - Philadelphia.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Idaho to Philadelphia 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 Idaho to Philadelphia?

    Currently, September is the cheapest month in which you can book a flight from Idaho to Philadelphia (average of $115). Flying from Idaho to Philadelphia in November is currently the most expensive (average of $276). 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

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
King of Prussia
Pottstown
Reading
Ocean City
Cherry Hill
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
Newark
Millville
Chester
Exton
Havre de Grace

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Top 5 airlines flying from Idaho to Philadelphia

Discover the top 5 airlines that operate flights from Idaho to Philadelphia. 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$130Average$248FlexibilityNo cancel feeOn-time62%
DeltaCheapest$228Average$458FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$319Average$533FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$340Average$701FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$407Average$526FlexibilityNo cancel feeOn-time63%

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