Frontier Airlines Flight 91 Deals & Information (2025/2026)

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Frontier Airlines Flight 91 Route Deals From $107

The cheapest prices found with in the last 7 days for return flights were $236 and $107 for one-way flights to Cancun Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Aug 10 - Thu, Aug 14
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$236 Roundtrip, just found
$236
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Aug 10 from Philadelphia Intl. to Cancun Intl., returning Thu, Aug 14, priced at $236 just found
Sun, Jul 27 - Thu, Jul 31
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$238 Roundtrip, found 7 hours ago
$238
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Sun, Jul 27 from Philadelphia Intl. to Cancun Intl., returning Thu, Jul 31, priced at $238 found 7 hours ago
Sun, Aug 10 - Thu, Aug 14
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$243 Roundtrip, just found
$243
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Aug 10 from Philadelphia Intl. to Cancun Intl., returning Thu, Aug 14, priced at $243 just found
Sun, Aug 10 - Thu, Aug 14
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$255 Roundtrip, just found
$255
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Aug 10 from Philadelphia Intl. to Cancun Intl., returning Thu, Aug 14, priced at $255 just found
Sun, Aug 24 - Thu, Aug 28
PHL
Philadelphia Intl.
CUN
Cancun Intl.
$264 Roundtrip, just found
$264
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Aug 24 from Philadelphia Intl. to Cancun Intl., returning Thu, Aug 28, priced at $264 just found
Thu, Aug 14 - Mon, Aug 18
TTN
Mercer
CUN
Cancun Intl.
$366 Roundtrip, found 5 days ago
$366
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Mercer to Cancun Intl., returning Mon, Aug 18, priced at $366 found 5 days ago
Thu, Aug 14 - Mon, Aug 18
TTN
Mercer
CUN
Cancun Intl.
$371 Roundtrip, found 4 days ago
$371
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Mercer to Cancun Intl., returning Mon, Aug 18, priced at $371 found 4 days ago
Thu, Aug 14 - Thu, Aug 21
TTN
Mercer
CUN
Cancun Intl.
$375 Roundtrip, found 6 days ago
$375
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Mercer to Cancun Intl., returning Thu, Aug 21, priced at $375 found 6 days ago
Thu, Aug 14 - Mon, Aug 18
TTN
Mercer
CUN
Cancun Intl.
$375 Roundtrip, found 6 days ago
$375
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Mercer to Cancun Intl., returning Mon, Aug 18, priced at $375 found 6 days ago
Sat, Oct 18 - Sat, Oct 25
TTN
Mercer
CUN
Cancun Intl.
$381 Roundtrip, found 9 hours ago
$381
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Sat, Oct 18 from Mercer to Cancun Intl., returning Sat, Oct 25, priced at $381 found 9 hours ago

Frequently asked questions

What route does flight number F991 take?
Flight number F991 operates directly from Philadelphia Airport to Cancun Intl. Airport (CUN). During this trip, expect to be in the air for about 4 hours. It's wise to book ahead to secure your preferred seat.
What terminal does F991 fly out of?
You'll likely be jetting out of Terminal E if you're flying on F991 direct from Philadelphia Intl. Airport (PHL) to Cancun Airport.
What kind of plane is on flight number F991?
There's every chance you'll find yourself jumping on board an Airbus A320 if you're traveling on flight number F991. Generally, this flight departs from Philadelphia Airport and comes in to land at Cancun Airport.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your F991 flight with Travelocity, please visit our Customer Service Portal.