In terms of precipitation, rainfall in Portland, Maine ranges from 2.9 - 4.5 inches per month. November is typically the wettest month, when rainfall can reach 4.5 in. August is typically the driest time to visit Portland, Maine when rainfall is around 2.9 in.

If weather is an important factor for your trip to Portland, Maine, 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 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

What is the cheapest time of day to fly from GRK to PWM?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Killeen to Portland, Maine as you normally would.

Most accurate provider : When it comes to deals on Killeen-Portland, Maine flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on Killeen-Portland, Maine flight deals on Cheapflights vs. Expedia <90% of the time. Price accuracy is based on data collected from Killeen-Portland, Maine flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Killeen-Portland, Maine flights, Cheapflights users trust Expedia the most. Expedia 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 Killeen-Portland, Maine 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 Killeen to Portland that include hotel bookings?

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

How can I find direct flights from Killeen to Portland?

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

Can I find deals for business class flights from Killeen to Portland?

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

Find Cheap Flights from Killeen to Portland, ME

Q: E

Most trusted provider : When it comes to deals on Killeen-Portland, Maine flights, Cheapflights users trust Expedia the most. Expedia 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 Killeen-Portland, Maine flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Q: Can I find deals for flights from Killeen to Portland that include hotel bookings?

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

Q: How can I find direct flights from Killeen to Portland?

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

Q: Can I find deals for business class flights from Killeen to Portland?

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

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Most accurate provider	Expedia 1 star
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Most accurate provider: When it comes to deals on Killeen-Portland, Maine flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on Killeen-Portland, Maine flight deals on Cheapflights vs. Expedia <90% of the time. Price accuracy is based on data collected from Killeen-Portland, Maine flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Killeen-Portland, Maine flights, Cheapflights users trust Expedia the most. Expedia 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 Killeen-Portland, Maine 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 Killeen to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from Killeen with our price prediction graph.

GRK-PWM

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.

Related info for your journey

Can I find deals for flights from Killeen to Portland that include hotel bookings?
Yes. In addition to deals on Killeen to Portland flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Killeen to Portland?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Killeen to Portland.
Can I find deals for business class flights from Killeen to Portland?
Yes. Cheapflights offers flight deals from Killeen to Portland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Find cheap flights from Killeen to Portland with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Find flight deals from Killeen to Portland

Most accurate provider

Most trusted provider

Best time to book a flight from Killeen to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from Killeen with our price prediction graph.

Related info for your journey

Can I find deals for flights from Killeen to Portland that include hotel bookings?

How can I find direct flights from Killeen to Portland?

Can I find deals for business class flights from Killeen to Portland?

Traveling to a place near Portland?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Killeen to Portland

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Complete your trip

Complete your trip to Portland by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Killeen to Portland by cabin class

Find flights from Killeen to Portland, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Killeen and Portland flights

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Cheap flights from Killeen to Portland, ME (GRK - PWM)

Find cheap flights from Killeen to Portland with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Find flight deals from Killeen to Portland

Most accurate provider

Most trusted provider

Best time to book a flight from Killeen to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from Killeen with our price prediction graph.

Related info for your journey

Can I find deals for flights from Killeen to Portland that include hotel bookings?

How can I find direct flights from Killeen to Portland?

Can I find deals for business class flights from Killeen to Portland?

Traveling to a place near Portland?

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 Killeen to Portland

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

Complete your trip

Complete your trip to Portland by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Killeen to Portland by cabin class

Find flights from Killeen to Portland, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Killeen and Portland flights

Browse other Killeen and Portland flight options. Last updated on September 12, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Other flights to Portland

Explore flights to Portland departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 12, 2026.

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