I was noticing that connecting to my app and Fly.io were being slower than usual and thought something might have been down with Fly’s servers. However, after some investigation, it looks like my traffic is being routed to Tokyo (NRT) before it makes it back to Dallas (DFW) where my app is hosted.
This appears to be an issue with my ISP, as changing to using a hotspot connection from my cellular provider routed me directly to DFW. I’m not sure if there is anything to do about this from Fly’s end, as it seems like my ISP just needs to get their BGP routes sorted out, but I figured I’d post to see if anyone else was having a similar issue.
Here is a cURL command I found somewhere else to show the Fly debug info:
❯ curl -s -o /dev/null -w @/tmp/curlformat -H "flyio-debug: doit" https://myapp.fly.dev # Obfuscated name
time_namelookup: 0.003840s
time_connect: 0.131942s
time_appconnect: 0.274572s
time_pretransfer: 0.274671s
time_redirect: 0.000000s
time_starttransfer: 0.599431s
----------
time_total: 0.599741s
{"date":["Wed, 08 Jul 2026 02:23:21 GMT"],
"content-length":["72"],
"vary":["accept-encoding"],
"content-type":["text/html; charset=utf-8"],
"x-permitted-cross-domain-policies":["none"],
"x-content-type-options":["nosniff"],
"content-security-policy":["base-uri 'self'; frame-ancestors 'self';"],
"referrer-policy":["strict-origin-when-cross-origin"],
"cache-control":["max-age=0, private, must-revalidate"],
"x-request-id":["GMAvP3wq_6daN1kABFHC"],
"location":["/login"],
"server":["Fly/6db84cd2 (2026-07-07)"],
"via":["2 fly.io, 2 fly.io"],
"fly-request-id":["01KWZRJYF56FA9W79EC4XC5TH1-nrt"],
"flyio-debug":["{\"n\":\"edge-dp-nrt1-00ff\",\"nr\":\"nrt\",\"ra\":\"216.16.29.200\",\"rf\":\"Verbatim\",\"sr\":\"dfw\",\"sdc\":\"dfw1\",\"sid\":\"e820e34c72d4d8\",\"st\":0,\"nrtt\":0,\"bn\":\"worker-dp-dfw1-7dcd\",\"mhn\":\"worker-dp-dfw1-7dcd\",\"mrtt\":131}"]
}
Performing a trace route also validates that my requests are bouncing across the US and to Tokyo. This is just happening to Fly anycast IPs for me; other traffic correctly doesn’t leave the continent.
.)